From 6a891a3111fe701517bb31c2204304724c7299c8 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:43 +0200 Subject: i2c: Drop unused i2c_driver.id field Nobody is using i2c_driver.id any longer, so we can drop that field. Signed-off-by: Jean Delvare diff --git a/include/linux/i2c-id.h b/include/linux/i2c-id.h index c9087de..e844a0b 100644 --- a/include/linux/i2c-id.h +++ b/include/linux/i2c-id.h @@ -28,17 +28,6 @@ identify a legacy client. If you don't need them, just don't set them. */ /* - * ---- Driver types ----------------------------------------------------- - */ - -#define I2C_DRIVERID_MSP3400 1 -#define I2C_DRIVERID_TUNER 2 -#define I2C_DRIVERID_TDA7432 27 /* Stereo sound processor */ -#define I2C_DRIVERID_TVAUDIO 29 /* Generic TV sound driver */ -#define I2C_DRIVERID_SAA711X 73 /* saa711x video encoders */ -#define I2C_DRIVERID_INFRARED 75 /* I2C InfraRed on Video boards */ - -/* * ---- Adapter types ---------------------------------------------------- */ diff --git a/include/linux/i2c.h b/include/linux/i2c.h index f4784c0..57d41b0 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -98,7 +98,6 @@ extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, /** * struct i2c_driver - represent an I2C device driver - * @id: Unique driver ID (optional) * @class: What kind of i2c device we instantiate (for detect) * @attach_adapter: Callback for bus addition (for legacy drivers) * @detach_adapter: Callback for bus removal (for legacy drivers) @@ -135,7 +134,6 @@ extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, * not allowed. */ struct i2c_driver { - int id; unsigned int class; /* Notifies the driver that a new bus has appeared or is about to be -- cgit v0.10.2 From 27693ce5f372c0af3b0730f5152b35432afa0fd7 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:43 +0200 Subject: i2c-taos-evm: Switch echo off to improve performance When echo is on, we waste time reading back our orders. Switching echo off makes performance much better: SMBus byte data transactions are 47% faster and byte transactions are 24% faster. Signed-off-by: Jean Delvare diff --git a/drivers/i2c/busses/i2c-taos-evm.c b/drivers/i2c/busses/i2c-taos-evm.c index 224aa12..dd39c1e 100644 --- a/drivers/i2c/busses/i2c-taos-evm.c +++ b/drivers/i2c/busses/i2c-taos-evm.c @@ -32,10 +32,12 @@ #define TAOS_STATE_INIT 0 #define TAOS_STATE_IDLE 1 -#define TAOS_STATE_SEND 2 +#define TAOS_STATE_EOFF 2 #define TAOS_STATE_RECV 3 #define TAOS_CMD_RESET 0x12 +#define TAOS_CMD_ECHO_ON '+' +#define TAOS_CMD_ECHO_OFF '-' static DECLARE_WAIT_QUEUE_HEAD(wq); @@ -102,17 +104,9 @@ static int taos_smbus_xfer(struct i2c_adapter *adapter, u16 addr, /* Send the transaction to the TAOS EVM */ dev_dbg(&adapter->dev, "Command buffer: %s\n", taos->buffer); - taos->pos = 0; - taos->state = TAOS_STATE_SEND; - serio_write(serio, taos->buffer[0]); - wait_event_interruptible_timeout(wq, taos->state == TAOS_STATE_IDLE, - msecs_to_jiffies(250)); - if (taos->state != TAOS_STATE_IDLE) { - dev_err(&adapter->dev, "Transaction failed " - "(state=%d, pos=%d)\n", taos->state, taos->pos); - taos->addr = 0; - return -EIO; - } + for (p = taos->buffer; *p; p++) + serio_write(serio, *p); + taos->addr = addr; /* Start the transaction and read the answer */ @@ -122,7 +116,7 @@ static int taos_smbus_xfer(struct i2c_adapter *adapter, u16 addr, wait_event_interruptible_timeout(wq, taos->state == TAOS_STATE_IDLE, msecs_to_jiffies(150)); if (taos->state != TAOS_STATE_IDLE - || taos->pos != 6) { + || taos->pos != 5) { dev_err(&adapter->dev, "Transaction timeout (pos=%d)\n", taos->pos); return -EIO; @@ -130,7 +124,7 @@ static int taos_smbus_xfer(struct i2c_adapter *adapter, u16 addr, dev_dbg(&adapter->dev, "Answer buffer: %s\n", taos->buffer); /* Interpret the returned string */ - p = taos->buffer + 2; + p = taos->buffer + 1; p[3] = '\0'; if (!strcmp(p, "NAK")) return -ENODEV; @@ -173,13 +167,9 @@ static irqreturn_t taos_interrupt(struct serio *serio, unsigned char data, wake_up_interruptible(&wq); } break; - case TAOS_STATE_SEND: - if (taos->buffer[++taos->pos]) - serio_write(serio, taos->buffer[taos->pos]); - else { - taos->state = TAOS_STATE_IDLE; - wake_up_interruptible(&wq); - } + case TAOS_STATE_EOFF: + taos->state = TAOS_STATE_IDLE; + wake_up_interruptible(&wq); break; case TAOS_STATE_RECV: taos->buffer[taos->pos++] = data; @@ -257,6 +247,19 @@ static int taos_connect(struct serio *serio, struct serio_driver *drv) } strlcpy(adapter->name, name, sizeof(adapter->name)); + /* Turn echo off for better performance */ + taos->state = TAOS_STATE_EOFF; + serio_write(serio, TAOS_CMD_ECHO_OFF); + + wait_event_interruptible_timeout(wq, taos->state == TAOS_STATE_IDLE, + msecs_to_jiffies(250)); + if (taos->state != TAOS_STATE_IDLE) { + err = -ENODEV; + dev_err(&adapter->dev, "Echo off failed " + "(state=%d)\n", taos->state); + goto exit_close; + } + err = i2c_add_adapter(adapter); if (err) goto exit_close; -- cgit v0.10.2 From ac7809414fb1e3e49b88ad6016e57598594aa4e2 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:44 +0200 Subject: i2c/tsl2550: Use combined SMBus transactions Make the I/O faster, mainly by using combined SMBus transactions when possible. While the TSL2550 datasheet doesn't say the device supports them, they seem to work just fine in practice, and a combined transaction is faster than two simple transactions in many cases and always more reliable. A side effect is to suppress the delays between SMBus writes and reads. The datasheet doesn't say they are needed and things work just fine for me without them. I also couldn't see any reason for the delay between reading the two channels. Nor for the loop to get a reading in the first place. The 400 ms delay between samples only matters at chip power-up, after that the chip always hold the previously sampled value so we never get to wait. All these changes make reading the lux value much faster and cheaper. Signed-off-by: Jean Delvare Tested-by: Michele De Candia Cc: Rodolfo Giometti diff --git a/drivers/i2c/chips/tsl2550.c b/drivers/i2c/chips/tsl2550.c index b96f302..aa96bd2 100644 --- a/drivers/i2c/chips/tsl2550.c +++ b/drivers/i2c/chips/tsl2550.c @@ -24,10 +24,9 @@ #include #include #include -#include #define TSL2550_DRV_NAME "tsl2550" -#define DRIVER_VERSION "1.1.2" +#define DRIVER_VERSION "1.2" /* * Defines @@ -96,32 +95,13 @@ static int tsl2550_set_power_state(struct i2c_client *client, int state) static int tsl2550_get_adc_value(struct i2c_client *client, u8 cmd) { - unsigned long end; - int loop = 0, ret = 0; + int ret; - /* - * Read ADC channel waiting at most 400ms (see data sheet for further - * info). - * To avoid long busy wait we spin for few milliseconds then - * start sleeping. - */ - end = jiffies + msecs_to_jiffies(400); - while (time_before(jiffies, end)) { - i2c_smbus_write_byte(client, cmd); - - if (loop++ < 5) - mdelay(1); - else - msleep(1); - - ret = i2c_smbus_read_byte(client); - if (ret < 0) - return ret; - else if (ret & 0x0080) - break; - } + ret = i2c_smbus_read_byte_data(client, cmd); + if (ret < 0) + return ret; if (!(ret & 0x80)) - return -EIO; + return -EAGAIN; return ret & 0x7f; /* remove the "valid" bit */ } @@ -285,8 +265,6 @@ static ssize_t __tsl2550_show_lux(struct i2c_client *client, char *buf) return ret; ch0 = ret; - mdelay(1); - ret = tsl2550_get_adc_value(client, TSL2550_READ_ADC1); if (ret < 0) return ret; @@ -345,11 +323,10 @@ static int tsl2550_init_client(struct i2c_client *client) * Probe the chip. To do so we try to power up the device and then to * read back the 0x03 code */ - err = i2c_smbus_write_byte(client, TSL2550_POWER_UP); + err = i2c_smbus_read_byte_data(client, TSL2550_POWER_UP); if (err < 0) return err; - mdelay(1); - if (i2c_smbus_read_byte(client) != TSL2550_POWER_UP) + if (err != TSL2550_POWER_UP) return -ENODEV; data->power_state = 1; @@ -374,7 +351,8 @@ static int __devinit tsl2550_probe(struct i2c_client *client, struct tsl2550_data *data; int *opmode, err = 0; - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) { + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE + | I2C_FUNC_SMBUS_READ_BYTE_DATA)) { err = -EIO; goto exit; } -- cgit v0.10.2 From 51298d1257b9f0a356ad66650c9fe2ca5bfa5ae3 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:45 +0200 Subject: i2c: Convert i2c clients to a device type This is required for upcoming changes. Signed-off-by: Jean Delvare Cc: Kay Sievers diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 0e45c29..f236b34 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -64,9 +64,13 @@ static const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, static int i2c_device_match(struct device *dev, struct device_driver *drv) { - struct i2c_client *client = to_i2c_client(dev); - struct i2c_driver *driver = to_i2c_driver(drv); + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_driver *driver; + if (!client) + return 0; + + driver = to_i2c_driver(drv); /* match on an id table if there is one */ if (driver->id_table) return i2c_match_id(driver->id_table, client) != NULL; @@ -94,10 +98,14 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) static int i2c_device_probe(struct device *dev) { - struct i2c_client *client = to_i2c_client(dev); - struct i2c_driver *driver = to_i2c_driver(dev->driver); + struct i2c_client *client = i2c_verify_client(dev); + struct i2c_driver *driver; int status; + if (!client) + return 0; + + driver = to_i2c_driver(dev->driver); if (!driver->probe || !driver->id_table) return -ENODEV; client->driver = driver; @@ -114,11 +122,11 @@ static int i2c_device_probe(struct device *dev) static int i2c_device_remove(struct device *dev) { - struct i2c_client *client = to_i2c_client(dev); + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; int status; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); @@ -136,37 +144,40 @@ static int i2c_device_remove(struct device *dev) static void i2c_device_shutdown(struct device *dev) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return; driver = to_i2c_driver(dev->driver); if (driver->shutdown) - driver->shutdown(to_i2c_client(dev)); + driver->shutdown(client); } static int i2c_device_suspend(struct device *dev, pm_message_t mesg) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); if (!driver->suspend) return 0; - return driver->suspend(to_i2c_client(dev), mesg); + return driver->suspend(client, mesg); } static int i2c_device_resume(struct device *dev) { + struct i2c_client *client = i2c_verify_client(dev); struct i2c_driver *driver; - if (!dev->driver) + if (!client || !dev->driver) return 0; driver = to_i2c_driver(dev->driver); if (!driver->resume) return 0; - return driver->resume(to_i2c_client(dev)); + return driver->resume(client); } static void i2c_client_dev_release(struct device *dev) @@ -188,18 +199,28 @@ show_modalias(struct device *dev, struct device_attribute *attr, char *buf) return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name); } -static struct device_attribute i2c_dev_attrs[] = { - __ATTR(name, S_IRUGO, show_client_name, NULL), +static DEVICE_ATTR(name, S_IRUGO, show_client_name, NULL); +static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); + +static struct attribute *i2c_dev_attrs[] = { + &dev_attr_name.attr, /* modalias helps coldplug: modprobe $(cat .../modalias) */ - __ATTR(modalias, S_IRUGO, show_modalias, NULL), - { }, + &dev_attr_modalias.attr, + NULL +}; + +static struct attribute_group i2c_dev_attr_group = { + .attrs = i2c_dev_attrs, +}; + +static const struct attribute_group *i2c_dev_attr_groups[] = { + &i2c_dev_attr_group, + NULL }; struct bus_type i2c_bus_type = { .name = "i2c", - .dev_attrs = i2c_dev_attrs, .match = i2c_device_match, - .uevent = i2c_device_uevent, .probe = i2c_device_probe, .remove = i2c_device_remove, .shutdown = i2c_device_shutdown, @@ -208,6 +229,12 @@ struct bus_type i2c_bus_type = { }; EXPORT_SYMBOL_GPL(i2c_bus_type); +static struct device_type i2c_client_type = { + .groups = i2c_dev_attr_groups, + .uevent = i2c_device_uevent, + .release = i2c_client_dev_release, +}; + /** * i2c_verify_client - return parameter as i2c_client, or NULL @@ -220,7 +247,7 @@ EXPORT_SYMBOL_GPL(i2c_bus_type); */ struct i2c_client *i2c_verify_client(struct device *dev) { - return (dev->bus == &i2c_bus_type) + return (dev->type == &i2c_client_type) ? to_i2c_client(dev) : NULL; } @@ -273,7 +300,7 @@ i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) client->dev.parent = &client->adapter->dev; client->dev.bus = &i2c_bus_type; - client->dev.release = i2c_client_dev_release; + client->dev.type = &i2c_client_type; dev_set_name(&client->dev, "%d-%04x", i2c_adapter_id(adap), client->addr); -- cgit v0.10.2 From 4f8cf8240a0c8b232c2ae22e019a4ba1d5f19ccd Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:46 +0200 Subject: i2c: Convert i2c adapters to bus devices Kay says i2c adapters shouldn't be class devices but bus devices. Convert them that way, using a device type. Signed-off-by: Jean Delvare Cc: Kay Sievers diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index f236b34..a18a251 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -46,6 +46,7 @@ static DEFINE_MUTEX(core_lock); static DEFINE_IDR(i2c_adapter_idr); static LIST_HEAD(userspace_devices); +static struct device_type i2c_client_type; static int i2c_check_addr(struct i2c_adapter *adapter, int addr); static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver); @@ -186,10 +187,10 @@ static void i2c_client_dev_release(struct device *dev) } static ssize_t -show_client_name(struct device *dev, struct device_attribute *attr, char *buf) +show_name(struct device *dev, struct device_attribute *attr, char *buf) { - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%s\n", client->name); + return sprintf(buf, "%s\n", dev->type == &i2c_client_type ? + to_i2c_client(dev)->name : to_i2c_adapter(dev)->name); } static ssize_t @@ -199,7 +200,7 @@ show_modalias(struct device *dev, struct device_attribute *attr, char *buf) return sprintf(buf, "%s%s\n", I2C_MODULE_PREFIX, client->name); } -static DEVICE_ATTR(name, S_IRUGO, show_client_name, NULL); +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); static struct attribute *i2c_dev_attrs[] = { @@ -395,13 +396,6 @@ static void i2c_adapter_dev_release(struct device *dev) complete(&adap->dev_released); } -static ssize_t -show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct i2c_adapter *adap = to_i2c_adapter(dev); - return sprintf(buf, "%s\n", adap->name); -} - /* * Let users instantiate I2C devices through sysfs. This can be used when * platform initialization code doesn't contain the proper data for @@ -520,17 +514,28 @@ i2c_sysfs_delete_device(struct device *dev, struct device_attribute *attr, return res; } -static struct device_attribute i2c_adapter_attrs[] = { - __ATTR(name, S_IRUGO, show_adapter_name, NULL), - __ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device), - __ATTR(delete_device, S_IWUSR, NULL, i2c_sysfs_delete_device), - { }, +static DEVICE_ATTR(new_device, S_IWUSR, NULL, i2c_sysfs_new_device); +static DEVICE_ATTR(delete_device, S_IWUSR, NULL, i2c_sysfs_delete_device); + +static struct attribute *i2c_adapter_attrs[] = { + &dev_attr_name.attr, + &dev_attr_new_device.attr, + &dev_attr_delete_device.attr, + NULL +}; + +static struct attribute_group i2c_adapter_attr_group = { + .attrs = i2c_adapter_attrs, }; -static struct class i2c_adapter_class = { - .owner = THIS_MODULE, - .name = "i2c-adapter", - .dev_attrs = i2c_adapter_attrs, +static const struct attribute_group *i2c_adapter_attr_groups[] = { + &i2c_adapter_attr_group, + NULL +}; + +static struct device_type i2c_adapter_type = { + .groups = i2c_adapter_attr_groups, + .release = i2c_adapter_dev_release, }; static void i2c_scan_static_board_info(struct i2c_adapter *adapter) @@ -582,8 +587,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap) adap->timeout = HZ; dev_set_name(&adap->dev, "i2c-%d", adap->nr); - adap->dev.release = &i2c_adapter_dev_release; - adap->dev.class = &i2c_adapter_class; + adap->dev.bus = &i2c_bus_type; + adap->dev.type = &i2c_adapter_type; res = device_register(&adap->dev); if (res) goto out_list; @@ -795,9 +800,13 @@ EXPORT_SYMBOL(i2c_del_adapter); static int __attach_adapter(struct device *dev, void *data) { - struct i2c_adapter *adapter = to_i2c_adapter(dev); + struct i2c_adapter *adapter; struct i2c_driver *driver = data; + if (dev->type != &i2c_adapter_type) + return 0; + adapter = to_i2c_adapter(dev); + i2c_detect(adapter, driver); /* Legacy drivers scan i2c busses directly */ @@ -836,8 +845,7 @@ int i2c_register_driver(struct module *owner, struct i2c_driver *driver) INIT_LIST_HEAD(&driver->clients); /* Walk the adapters that are already present */ mutex_lock(&core_lock); - class_for_each_device(&i2c_adapter_class, NULL, driver, - __attach_adapter); + bus_for_each_dev(&i2c_bus_type, NULL, driver, __attach_adapter); mutex_unlock(&core_lock); return 0; @@ -846,10 +854,14 @@ EXPORT_SYMBOL(i2c_register_driver); static int __detach_adapter(struct device *dev, void *data) { - struct i2c_adapter *adapter = to_i2c_adapter(dev); + struct i2c_adapter *adapter; struct i2c_driver *driver = data; struct i2c_client *client, *_n; + if (dev->type != &i2c_adapter_type) + return 0; + adapter = to_i2c_adapter(dev); + /* Remove the devices we created ourselves as the result of hardware * probing (using a driver's detect method) */ list_for_each_entry_safe(client, _n, &driver->clients, detected) { @@ -877,8 +889,7 @@ static int __detach_adapter(struct device *dev, void *data) void i2c_del_driver(struct i2c_driver *driver) { mutex_lock(&core_lock); - class_for_each_device(&i2c_adapter_class, NULL, driver, - __detach_adapter); + bus_for_each_dev(&i2c_bus_type, NULL, driver, __detach_adapter); mutex_unlock(&core_lock); driver_unregister(&driver->driver); @@ -967,16 +978,11 @@ static int __init i2c_init(void) retval = bus_register(&i2c_bus_type); if (retval) return retval; - retval = class_register(&i2c_adapter_class); - if (retval) - goto bus_err; retval = i2c_add_driver(&dummy_driver); if (retval) - goto class_err; + goto bus_err; return 0; -class_err: - class_unregister(&i2c_adapter_class); bus_err: bus_unregister(&i2c_bus_type); return retval; @@ -985,7 +991,6 @@ bus_err: static void __exit i2c_exit(void) { i2c_del_driver(&dummy_driver); - class_unregister(&i2c_adapter_class); bus_unregister(&i2c_bus_type); } -- cgit v0.10.2 From 2bb5095affdb8d6e8646a5b8b5a35c1d6a28c3e7 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:46 +0200 Subject: i2c: Provide compatibility links for i2c adapters Some user-space applications may be relying on i2c adapters showing up as class devices in sysfs. Provide compatibility links for them for the time being. We will remove them after a long transition period. Signed-off-by: Jean Delvare Cc: Kay Sievers diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig index 711ca08..d7ece13 100644 --- a/drivers/i2c/Kconfig +++ b/drivers/i2c/Kconfig @@ -27,6 +27,14 @@ config I2C_BOARDINFO boolean default y +config I2C_COMPAT + boolean "Enable compatibility bits for old user-space" + default y + help + Say Y here if you intend to run lm-sensors 3.1.1 or older, or any + other user-space package which expects i2c adapters to be class + devices. If you don't know, say Y. + config I2C_CHARDEV tristate "I2C device interface" help diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index a18a251..8d80fce 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -538,6 +538,10 @@ static struct device_type i2c_adapter_type = { .release = i2c_adapter_dev_release, }; +#ifdef CONFIG_I2C_COMPAT +static struct class_compat *i2c_adapter_compat_class; +#endif + static void i2c_scan_static_board_info(struct i2c_adapter *adapter) { struct i2c_devinfo *devinfo; @@ -595,6 +599,14 @@ static int i2c_register_adapter(struct i2c_adapter *adap) dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); +#ifdef CONFIG_I2C_COMPAT + res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); + if (res) + dev_warn(&adap->dev, + "Failed to create compatibility class link\n"); +#endif + /* create pre-declared device nodes */ if (adap->nr < __i2c_first_dynamic_bus_num) i2c_scan_static_board_info(adap); @@ -773,6 +785,11 @@ int i2c_del_adapter(struct i2c_adapter *adap) checking the returned value. */ res = device_for_each_child(&adap->dev, NULL, __unregister_client); +#ifdef CONFIG_I2C_COMPAT + class_compat_remove_link(i2c_adapter_compat_class, &adap->dev, + adap->dev.parent); +#endif + /* clean up the sysfs representation */ init_completion(&adap->dev_released); device_unregister(&adap->dev); @@ -978,12 +995,23 @@ static int __init i2c_init(void) retval = bus_register(&i2c_bus_type); if (retval) return retval; +#ifdef CONFIG_I2C_COMPAT + i2c_adapter_compat_class = class_compat_register("i2c-adapter"); + if (!i2c_adapter_compat_class) { + retval = -ENOMEM; + goto bus_err; + } +#endif retval = i2c_add_driver(&dummy_driver); if (retval) - goto bus_err; + goto class_err; return 0; +class_err: +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); bus_err: +#endif bus_unregister(&i2c_bus_type); return retval; } @@ -991,6 +1019,9 @@ bus_err: static void __exit i2c_exit(void) { i2c_del_driver(&dummy_driver); +#ifdef CONFIG_I2C_COMPAT + class_compat_unregister(i2c_adapter_compat_class); +#endif bus_unregister(&i2c_bus_type); } -- cgit v0.10.2 From fce96f3e5d34b0e3195f9d1bf2b3c7e3841e90ff Mon Sep 17 00:00:00 2001 From: Willy Tarreau Date: Fri, 18 Sep 2009 22:45:47 +0200 Subject: i2c/scx200_acb: Provide more information on bus errors Upon a bus error, it's rather hard to guess what happened. Dumping the address, length and status provides a lot of value for troubleshooting issues. Signed-off-by: Willy Tarreau Signed-off-by: Jean Delvare diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c index 648ecc6..cf994bd 100644 --- a/drivers/i2c/busses/scx200_acb.c +++ b/drivers/i2c/busses/scx200_acb.c @@ -217,8 +217,10 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) return; error: - dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg, - scx200_acb_state_name[iface->state]); + dev_err(&iface->adapter.dev, + "%s in state %s (addr=0x%02x, len=%d, status=0x%02x)\n", errmsg, + scx200_acb_state_name[iface->state], iface->address_byte, + iface->len, status); iface->state = state_idle; iface->result = -EIO; -- cgit v0.10.2 From 4ba2ccb83e03077bb94f8848ee573f1e27cea969 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:47 +0200 Subject: gpio/pcf857x: Copy i2c_device_id from old pcf8574 driver The deprecated pcf8574 driver is going to be removed. Make sure the replacement driver inherits all i2c_device_ids for a smooth transition. Signed-off-by: Wolfram Sang Cc: David Brownell Signed-off-by: Jean Delvare diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c index 9525724..3f1ec1e 100644 --- a/drivers/gpio/pcf857x.c +++ b/drivers/gpio/pcf857x.c @@ -28,6 +28,7 @@ static const struct i2c_device_id pcf857x_id[] = { { "pcf8574", 8 }, + { "pcf8574a", 8 }, { "pca8574", 8 }, { "pca9670", 8 }, { "pca9672", 8 }, -- cgit v0.10.2 From 8f67eeb0b44cde19216955975ffef8513a87c0c0 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:48 +0200 Subject: i2c/chips: Remove deprecated pcf8575 driver The pcf8575 driver in drivers/i2c/chips which just exports its register to sysfs is superseded by drivers/gpio/pcf857x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Cc: Bart Van Assche Signed-off-by: Jean Delvare diff --git a/Documentation/i2c/chips/pcf8575 b/Documentation/i2c/chips/pcf8575 deleted file mode 100644 index 40b268e..0000000 --- a/Documentation/i2c/chips/pcf8575 +++ /dev/null @@ -1,69 +0,0 @@ -About the PCF8575 chip and the pcf8575 kernel driver -==================================================== - -The PCF8575 chip is produced by the following manufacturers: - - * Philips NXP - http://www.nxp.com/#/pip/cb=[type=product,path=50807/41735/41850,final=PCF8575_3]|pip=[pip=PCF8575_3][0] - - * Texas Instruments - http://focus.ti.com/docs/prod/folders/print/pcf8575.html - - -Some vendors sell small PCB's with the PCF8575 mounted on it. You can connect -such a board to a Linux host via e.g. an USB to I2C interface. Examples of -PCB boards with a PCF8575: - - * SFE Breakout Board for PCF8575 I2C Expander by RobotShop - http://www.robotshop.ca/home/products/robot-parts/electronics/adapters-converters/sfe-pcf8575-i2c-expander-board.html - - * Breakout Board for PCF8575 I2C Expander by Spark Fun Electronics - http://www.sparkfun.com/commerce/product_info.php?products_id=8130 - - -Description ------------ -The PCF8575 chip is a 16-bit I/O expander for the I2C bus. Up to eight of -these chips can be connected to the same I2C bus. You can find this -chip on some custom designed hardware, but you won't find it on PC -motherboards. - -The PCF8575 chip consists of a 16-bit quasi-bidirectional port and an I2C-bus -interface. Each of the sixteen I/O's can be independently used as an input or -an output. To set up an I/O pin as an input, you have to write a 1 to the -corresponding output. - -For more information please see the datasheet. - - -Detection ---------- - -There is no method known to detect whether a chip on a given I2C address is -a PCF8575 or whether it is any other I2C device, so you have to pass the I2C -bus and address of the installed PCF8575 devices explicitly to the driver at -load time via the force=... parameter. - -/sys interface --------------- - -For each address on which a PCF8575 chip was found or forced the following -files will be created under /sys: -* /sys/bus/i2c/devices/-
/read -* /sys/bus/i2c/devices/-
/write -where bus is the I2C bus number (0, 1, ...) and address is the four-digit -hexadecimal representation of the 7-bit I2C address of the PCF8575 -(0020 .. 0027). - -The read file is read-only. Reading it will trigger an I2C read and will hence -report the current input state for the pins configured as inputs, and the -current output value for the pins configured as outputs. - -The write file is read-write. Writing a value to it will configure all pins -as output for which the corresponding bit is zero. Reading the write file will -return the value last written, or -EAGAIN if no value has yet been written to -the write file. - -On module initialization the configuration of the chip is not changed -- the -chip is left in the state it was already configured in through either power-up -or through previous I2C write actions. diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 02d746c..1b5455e 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -33,24 +33,6 @@ config SENSORS_PCF8574 These devices are hard to detect and rarely found on mainstream hardware. If unsure, say N. -config PCF8575 - tristate "Philips PCF8575 (DEPRECATED)" - default n - depends on GPIO_PCF857X = "n" - help - If you say yes here you get support for Philips PCF8575 chip. - This chip is a 16-bit I/O expander for the I2C bus. Several other - chip manufacturers sell equivalent chips, e.g. Texas Instruments. - - This driver can also be built as a module. If so, the module - will be called pcf8575. - - This driver is deprecated and will be dropped soon. Use - drivers/gpio/pcf857x.c instead. - - This device is hard to detect and is rarely found on mainstream - hardware. If unsure, say N. - config SENSORS_PCA9539 tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)" depends on EXPERIMENTAL && GPIO_PCA953X = "n" diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index f4680d1..fceb377 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -13,7 +13,6 @@ obj-$(CONFIG_DS1682) += ds1682.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o -obj-$(CONFIG_PCF8575) += pcf8575.o obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) diff --git a/drivers/i2c/chips/pcf8575.c b/drivers/i2c/chips/pcf8575.c deleted file mode 100644 index 07fd7cb..0000000 --- a/drivers/i2c/chips/pcf8575.c +++ /dev/null @@ -1,198 +0,0 @@ -/* - pcf8575.c - - About the PCF8575 chip: the PCF8575 is a 16-bit I/O expander for the I2C bus - produced by a.o. Philips Semiconductors. - - Copyright (C) 2006 Michael Hennerich, Analog Devices Inc. - - Based on pcf8574.c. - - Copyright (c) 2007 Bart Van Assche . - Ported this driver from ucLinux to the mainstream Linux kernel. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include -#include -#include -#include /* kzalloc() */ -#include /* sysfs_create_group() */ - -/* Addresses to scan: none, device can't be detected */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD; - - -/* Each client has this additional data */ -struct pcf8575_data { - int write; /* last written value, or error code */ -}; - -/* following are the sysfs callback functions */ -static ssize_t show_read(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct i2c_client *client = to_i2c_client(dev); - u16 val; - u8 iopin_state[2]; - - i2c_master_recv(client, iopin_state, 2); - - val = iopin_state[0]; - val |= iopin_state[1] << 8; - - return sprintf(buf, "%u\n", val); -} - -static DEVICE_ATTR(read, S_IRUGO, show_read, NULL); - -static ssize_t show_write(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct pcf8575_data *data = dev_get_drvdata(dev); - if (data->write < 0) - return data->write; - return sprintf(buf, "%d\n", data->write); -} - -static ssize_t set_write(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct pcf8575_data *data = i2c_get_clientdata(client); - unsigned long val = simple_strtoul(buf, NULL, 10); - u8 iopin_state[2]; - - if (val > 0xffff) - return -EINVAL; - - data->write = val; - - iopin_state[0] = val & 0xFF; - iopin_state[1] = val >> 8; - - i2c_master_send(client, iopin_state, 2); - - return count; -} - -static DEVICE_ATTR(write, S_IWUSR | S_IRUGO, show_write, set_write); - -static struct attribute *pcf8575_attributes[] = { - &dev_attr_read.attr, - &dev_attr_write.attr, - NULL -}; - -static const struct attribute_group pcf8575_attr_group = { - .attrs = pcf8575_attributes, -}; - -/* - * Real code - */ - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int pcf8575_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) - return -ENODEV; - - /* This is the place to detect whether the chip at the specified - address really is a PCF8575 chip. However, there is no method known - to detect whether an I2C chip is a PCF8575 or any other I2C chip. */ - - strlcpy(info->type, "pcf8575", I2C_NAME_SIZE); - - return 0; -} - -static int pcf8575_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct pcf8575_data *data; - int err; - - data = kzalloc(sizeof(struct pcf8575_data), GFP_KERNEL); - if (!data) { - err = -ENOMEM; - goto exit; - } - - i2c_set_clientdata(client, data); - data->write = -EAGAIN; - - /* Register sysfs hooks */ - err = sysfs_create_group(&client->dev.kobj, &pcf8575_attr_group); - if (err) - goto exit_free; - - return 0; - -exit_free: - kfree(data); -exit: - return err; -} - -static int pcf8575_remove(struct i2c_client *client) -{ - sysfs_remove_group(&client->dev.kobj, &pcf8575_attr_group); - kfree(i2c_get_clientdata(client)); - return 0; -} - -static const struct i2c_device_id pcf8575_id[] = { - { "pcf8575", 0 }, - { } -}; - -static struct i2c_driver pcf8575_driver = { - .driver = { - .owner = THIS_MODULE, - .name = "pcf8575", - }, - .probe = pcf8575_probe, - .remove = pcf8575_remove, - .id_table = pcf8575_id, - - .detect = pcf8575_detect, - .address_data = &addr_data, -}; - -static int __init pcf8575_init(void) -{ - return i2c_add_driver(&pcf8575_driver); -} - -static void __exit pcf8575_exit(void) -{ - i2c_del_driver(&pcf8575_driver); -} - -MODULE_AUTHOR("Michael Hennerich , " - "Bart Van Assche "); -MODULE_DESCRIPTION("pcf8575 driver"); -MODULE_LICENSE("GPL"); - -module_init(pcf8575_init); -module_exit(pcf8575_exit); -- cgit v0.10.2 From 732d481127abaa0add41ee918191ea08e9ede17e Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:48 +0200 Subject: i2c/chips: Remove deprecated pca9539 driver The pca9539 driver in drivers/i2c/chips which just exports its registers to sysfs is superseded by drivers/gpio/pca953x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Acked-by: Ben Gardner Signed-off-by: Jean Delvare diff --git a/Documentation/i2c/chips/pca9539 b/Documentation/i2c/chips/pca9539 deleted file mode 100644 index 6aff890..0000000 --- a/Documentation/i2c/chips/pca9539 +++ /dev/null @@ -1,58 +0,0 @@ -Kernel driver pca9539 -===================== - -NOTE: this driver is deprecated and will be dropped soon, use -drivers/gpio/pca9539.c instead. - -Supported chips: - * Philips PCA9539 - Prefix: 'pca9539' - Addresses scanned: none - Datasheet: - http://www.semiconductors.philips.com/acrobat/datasheets/PCA9539_2.pdf - -Author: Ben Gardner - - -Description ------------ - -The Philips PCA9539 is a 16 bit low power I/O device. -All 16 lines can be individually configured as an input or output. -The input sense can also be inverted. -The 16 lines are split between two bytes. - - -Detection ---------- - -The PCA9539 is difficult to detect and not commonly found in PC machines, -so you have to pass the I2C bus and address of the installed PCA9539 -devices explicitly to the driver at load time via the force=... parameter. - - -Sysfs entries -------------- - -Each is a byte that maps to the 8 I/O bits. -A '0' suffix is for bits 0-7, while '1' is for bits 8-15. - -input[01] - read the current value -output[01] - sets the output value -direction[01] - direction of each bit: 1=input, 0=output -invert[01] - toggle the input bit sense - -input reads the actual state of the line and is always available. -The direction defaults to input for all channels. - - -General Remarks ---------------- - -Note that each output, direction, and invert entry controls 8 lines. -You should use the read, modify, write sequence. -For example. to set output bit 0 of 1. - val=$(cat output0) - val=$(( $val | 1 )) - echo $val > output0 - diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 1b5455e..8cd1a7f 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -33,19 +33,6 @@ config SENSORS_PCF8574 These devices are hard to detect and rarely found on mainstream hardware. If unsure, say N. -config SENSORS_PCA9539 - tristate "Philips PCA9539 16-bit I/O port (DEPRECATED)" - depends on EXPERIMENTAL && GPIO_PCA953X = "n" - help - If you say yes here you get support for the Philips PCA9539 - 16-bit I/O port. - - This driver can also be built as a module. If so, the module - will be called pca9539. - - This driver is deprecated and will be dropped soon. Use - drivers/gpio/pca953x.c instead. - config SENSORS_TSL2550 tristate "Taos TSL2550 ambient light sensor" depends on EXPERIMENTAL diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index fceb377..8cd778d 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -11,7 +11,6 @@ # obj-$(CONFIG_DS1682) += ds1682.o -obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o diff --git a/drivers/i2c/chips/pca9539.c b/drivers/i2c/chips/pca9539.c deleted file mode 100644 index 270de4e..0000000 --- a/drivers/i2c/chips/pca9539.c +++ /dev/null @@ -1,152 +0,0 @@ -/* - pca9539.c - 16-bit I/O port with interrupt and reset - - Copyright (C) 2005 Ben Gardner - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; version 2 of the License. -*/ - -#include -#include -#include -#include -#include - -/* Addresses to scan: none, device is not autodetected */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_1(pca9539); - -enum pca9539_cmd -{ - PCA9539_INPUT_0 = 0, - PCA9539_INPUT_1 = 1, - PCA9539_OUTPUT_0 = 2, - PCA9539_OUTPUT_1 = 3, - PCA9539_INVERT_0 = 4, - PCA9539_INVERT_1 = 5, - PCA9539_DIRECTION_0 = 6, - PCA9539_DIRECTION_1 = 7, -}; - -/* following are the sysfs callback functions */ -static ssize_t pca9539_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct sensor_device_attribute *psa = to_sensor_dev_attr(attr); - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%d\n", i2c_smbus_read_byte_data(client, - psa->index)); -} - -static ssize_t pca9539_store(struct device *dev, struct device_attribute *attr, - const char *buf, size_t count) -{ - struct sensor_device_attribute *psa = to_sensor_dev_attr(attr); - struct i2c_client *client = to_i2c_client(dev); - unsigned long val = simple_strtoul(buf, NULL, 0); - if (val > 0xff) - return -EINVAL; - i2c_smbus_write_byte_data(client, psa->index, val); - return count; -} - -/* Define the device attributes */ - -#define PCA9539_ENTRY_RO(name, cmd_idx) \ - static SENSOR_DEVICE_ATTR(name, S_IRUGO, pca9539_show, NULL, cmd_idx) - -#define PCA9539_ENTRY_RW(name, cmd_idx) \ - static SENSOR_DEVICE_ATTR(name, S_IRUGO | S_IWUSR, pca9539_show, \ - pca9539_store, cmd_idx) - -PCA9539_ENTRY_RO(input0, PCA9539_INPUT_0); -PCA9539_ENTRY_RO(input1, PCA9539_INPUT_1); -PCA9539_ENTRY_RW(output0, PCA9539_OUTPUT_0); -PCA9539_ENTRY_RW(output1, PCA9539_OUTPUT_1); -PCA9539_ENTRY_RW(invert0, PCA9539_INVERT_0); -PCA9539_ENTRY_RW(invert1, PCA9539_INVERT_1); -PCA9539_ENTRY_RW(direction0, PCA9539_DIRECTION_0); -PCA9539_ENTRY_RW(direction1, PCA9539_DIRECTION_1); - -static struct attribute *pca9539_attributes[] = { - &sensor_dev_attr_input0.dev_attr.attr, - &sensor_dev_attr_input1.dev_attr.attr, - &sensor_dev_attr_output0.dev_attr.attr, - &sensor_dev_attr_output1.dev_attr.attr, - &sensor_dev_attr_invert0.dev_attr.attr, - &sensor_dev_attr_invert1.dev_attr.attr, - &sensor_dev_attr_direction0.dev_attr.attr, - &sensor_dev_attr_direction1.dev_attr.attr, - NULL -}; - -static struct attribute_group pca9539_defattr_group = { - .attrs = pca9539_attributes, -}; - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int pca9539_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) - return -ENODEV; - - strlcpy(info->type, "pca9539", I2C_NAME_SIZE); - - return 0; -} - -static int pca9539_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - /* Register sysfs hooks */ - return sysfs_create_group(&client->dev.kobj, - &pca9539_defattr_group); -} - -static int pca9539_remove(struct i2c_client *client) -{ - sysfs_remove_group(&client->dev.kobj, &pca9539_defattr_group); - return 0; -} - -static const struct i2c_device_id pca9539_id[] = { - { "pca9539", 0 }, - { } -}; - -static struct i2c_driver pca9539_driver = { - .driver = { - .name = "pca9539", - }, - .probe = pca9539_probe, - .remove = pca9539_remove, - .id_table = pca9539_id, - - .detect = pca9539_detect, - .address_data = &addr_data, -}; - -static int __init pca9539_init(void) -{ - return i2c_add_driver(&pca9539_driver); -} - -static void __exit pca9539_exit(void) -{ - i2c_del_driver(&pca9539_driver); -} - -MODULE_AUTHOR("Ben Gardner "); -MODULE_DESCRIPTION("PCA9539 driver"); -MODULE_LICENSE("GPL"); - -module_init(pca9539_init); -module_exit(pca9539_exit); - -- cgit v0.10.2 From e7c5c49ecdac6dc5a6b67a27838b1b562eeec1b9 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:49 +0200 Subject: i2c/chips: Remove deprecated pcf8574 driver The pcf8574 driver in drivers/i2c/chips which just exports its register to sysfs is superseded by drivers/gpio/pcf857x.c which properly uses the gpiolib. As this driver has been deprecated for more than a year, finally remove it. Signed-off-by: Wolfram Sang Cc: Aurelien Jarno Signed-off-by: Jean Delvare diff --git a/Documentation/i2c/chips/pcf8574 b/Documentation/i2c/chips/pcf8574 deleted file mode 100644 index 235815c..0000000 --- a/Documentation/i2c/chips/pcf8574 +++ /dev/null @@ -1,65 +0,0 @@ -Kernel driver pcf8574 -===================== - -Supported chips: - * Philips PCF8574 - Prefix: 'pcf8574' - Addresses scanned: none - Datasheet: Publicly available at the Philips Semiconductors website - http://www.semiconductors.philips.com/pip/PCF8574P.html - - * Philips PCF8574A - Prefix: 'pcf8574a' - Addresses scanned: none - Datasheet: Publicly available at the Philips Semiconductors website - http://www.semiconductors.philips.com/pip/PCF8574P.html - -Authors: - Frodo Looijaard , - Philip Edelbrock , - Dan Eaton , - Aurelien Jarno , - Jean Delvare , - - -Description ------------ -The PCF8574(A) is an 8-bit I/O expander for the I2C bus produced by Philips -Semiconductors. It is designed to provide a byte I2C interface to up to 16 -separate devices (8 x PCF8574 and 8 x PCF8574A). - -This device consists of a quasi-bidirectional port. Each of the eight I/Os -can be independently used as an input or output. To setup an I/O as an -input, you have to write a 1 to the corresponding output. - -For more informations see the datasheet. - - -Accessing PCF8574(A) via /sys interface -------------------------------------- - -The PCF8574(A) is plainly impossible to detect ! Stupid chip. -So, you have to pass the I2C bus and address of the installed PCF857A -and PCF8574A devices explicitly to the driver at load time via the -force=... parameter. - -On detection (i.e. insmod, modprobe et al.), directories are being -created for each detected PCF8574(A): - -/sys/bus/i2c/devices/<0>-<1>/ -where <0> is the bus the chip was detected on (e. g. i2c-0) -and <1> the chip address ([20..27] or [38..3f]): - -(example: /sys/bus/i2c/devices/1-0020/) - -Inside these directories, there are two files each: -read and write (and one file with chip name). - -The read file is read-only. Reading gives you the current I/O input -if the corresponding output is set as 1, otherwise the current output -value, that is to say 0. - -The write file is read/write. Writing a value outputs it on the I/O -port. Reading returns the last written value. As it is not possible -to read this value from the chip, you need to write at least once to -this file before you can read back from it. diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 8cd1a7f..f9618f4 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -16,23 +16,6 @@ config DS1682 This driver can also be built as a module. If so, the module will be called ds1682. -config SENSORS_PCF8574 - tristate "Philips PCF8574 and PCF8574A (DEPRECATED)" - depends on EXPERIMENTAL && GPIO_PCF857X = "n" - default n - help - If you say yes here you get support for Philips PCF8574 and - PCF8574A chips. These chips are 8-bit I/O expanders for the I2C bus. - - This driver can also be built as a module. If so, the module - will be called pcf8574. - - This driver is deprecated and will be dropped soon. Use - drivers/gpio/pcf857x.c instead. - - These devices are hard to detect and rarely found on mainstream - hardware. If unsure, say N. - config SENSORS_TSL2550 tristate "Taos TSL2550 ambient light sensor" depends on EXPERIMENTAL diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index 8cd778d..749cf36 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -11,7 +11,6 @@ # obj-$(CONFIG_DS1682) += ds1682.o -obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) diff --git a/drivers/i2c/chips/pcf8574.c b/drivers/i2c/chips/pcf8574.c deleted file mode 100644 index 6ec3098..0000000 --- a/drivers/i2c/chips/pcf8574.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - Copyright (c) 2000 Frodo Looijaard , - Philip Edelbrock , - Dan Eaton - Ported to Linux 2.6 by Aurelien Jarno with - the help of Jean Delvare - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -/* A few notes about the PCF8574: - -* The PCF8574 is an 8-bit I/O expander for the I2C bus produced by - Philips Semiconductors. It is designed to provide a byte I2C - interface to up to 8 separate devices. - -* The PCF8574 appears as a very simple SMBus device which can be - read from or written to with SMBUS byte read/write accesses. - - --Dan - -*/ - -#include -#include -#include -#include - -/* Addresses to scan: none, device can't be detected */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_2(pcf8574, pcf8574a); - -/* Each client has this additional data */ -struct pcf8574_data { - int write; /* Remember last written value */ -}; - -static void pcf8574_init_client(struct i2c_client *client); - -/* following are the sysfs callback functions */ -static ssize_t show_read(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct i2c_client *client = to_i2c_client(dev); - return sprintf(buf, "%u\n", i2c_smbus_read_byte(client)); -} - -static DEVICE_ATTR(read, S_IRUGO, show_read, NULL); - -static ssize_t show_write(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct pcf8574_data *data = i2c_get_clientdata(to_i2c_client(dev)); - - if (data->write < 0) - return data->write; - - return sprintf(buf, "%d\n", data->write); -} - -static ssize_t set_write(struct device *dev, struct device_attribute *attr, const char *buf, - size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct pcf8574_data *data = i2c_get_clientdata(client); - unsigned long val = simple_strtoul(buf, NULL, 10); - - if (val > 0xff) - return -EINVAL; - - data->write = val; - i2c_smbus_write_byte(client, data->write); - return count; -} - -static DEVICE_ATTR(write, S_IWUSR | S_IRUGO, show_write, set_write); - -static struct attribute *pcf8574_attributes[] = { - &dev_attr_read.attr, - &dev_attr_write.attr, - NULL -}; - -static const struct attribute_group pcf8574_attr_group = { - .attrs = pcf8574_attributes, -}; - -/* - * Real code - */ - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int pcf8574_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - const char *client_name; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) - return -ENODEV; - - /* Now, we would do the remaining detection. But the PCF8574 is plainly - impossible to detect! Stupid chip. */ - - /* Determine the chip type */ - if (kind <= 0) { - if (client->addr >= 0x38 && client->addr <= 0x3f) - kind = pcf8574a; - else - kind = pcf8574; - } - - if (kind == pcf8574a) - client_name = "pcf8574a"; - else - client_name = "pcf8574"; - strlcpy(info->type, client_name, I2C_NAME_SIZE); - - return 0; -} - -static int pcf8574_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct pcf8574_data *data; - int err; - - data = kzalloc(sizeof(struct pcf8574_data), GFP_KERNEL); - if (!data) { - err = -ENOMEM; - goto exit; - } - - i2c_set_clientdata(client, data); - - /* Initialize the PCF8574 chip */ - pcf8574_init_client(client); - - /* Register sysfs hooks */ - err = sysfs_create_group(&client->dev.kobj, &pcf8574_attr_group); - if (err) - goto exit_free; - return 0; - - exit_free: - kfree(data); - exit: - return err; -} - -static int pcf8574_remove(struct i2c_client *client) -{ - sysfs_remove_group(&client->dev.kobj, &pcf8574_attr_group); - kfree(i2c_get_clientdata(client)); - return 0; -} - -/* Called when we have found a new PCF8574. */ -static void pcf8574_init_client(struct i2c_client *client) -{ - struct pcf8574_data *data = i2c_get_clientdata(client); - data->write = -EAGAIN; -} - -static const struct i2c_device_id pcf8574_id[] = { - { "pcf8574", 0 }, - { "pcf8574a", 0 }, - { } -}; - -static struct i2c_driver pcf8574_driver = { - .driver = { - .name = "pcf8574", - }, - .probe = pcf8574_probe, - .remove = pcf8574_remove, - .id_table = pcf8574_id, - - .detect = pcf8574_detect, - .address_data = &addr_data, -}; - -static int __init pcf8574_init(void) -{ - return i2c_add_driver(&pcf8574_driver); -} - -static void __exit pcf8574_exit(void) -{ - i2c_del_driver(&pcf8574_driver); -} - - -MODULE_AUTHOR - ("Frodo Looijaard , " - "Philip Edelbrock , " - "Dan Eaton " - "and Aurelien Jarno "); -MODULE_DESCRIPTION("PCF8574 driver"); -MODULE_LICENSE("GPL"); - -module_init(pcf8574_init); -module_exit(pcf8574_exit); -- cgit v0.10.2 From 76b3e28fa728bb68895cbd8375f5ce233bd891de Mon Sep 17 00:00:00 2001 From: Crane Cai Date: Fri, 18 Sep 2009 22:45:50 +0200 Subject: i2c-piix4: Add AMD SB900 SMBus device ID Add new SMBus device ID for AMD SB900. Signed-off-by: Crane Cai Signed-off-by: Jean Delvare diff --git a/Documentation/i2c/busses/i2c-piix4 b/Documentation/i2c/busses/i2c-piix4 index f889481..c5b37c5 100644 --- a/Documentation/i2c/busses/i2c-piix4 +++ b/Documentation/i2c/busses/i2c-piix4 @@ -8,6 +8,8 @@ Supported adapters: Datasheet: Only available via NDA from ServerWorks * ATI IXP200, IXP300, IXP400, SB600, SB700 and SB800 southbridges Datasheet: Not publicly available + * AMD SB900 + Datasheet: Not publicly available * Standard Microsystems (SMSC) SLC90E66 (Victory66) southbridge Datasheet: Publicly available at the SMSC website http://www.smsc.com diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 8206442..bb216c5 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -113,7 +113,7 @@ config I2C_ISCH will be called i2c-isch. config I2C_PIIX4 - tristate "Intel PIIX4 and compatible (ATI/Serverworks/Broadcom/SMSC)" + tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)" depends on PCI help If you say yes to this option, support will be included for the Intel @@ -128,6 +128,7 @@ config I2C_PIIX4 ATI SB600 ATI SB700 ATI SB800 + AMD SB900 Serverworks OSB4 Serverworks CSB5 Serverworks CSB6 diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 0249a7d..a782c7a 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -22,6 +22,7 @@ Intel PIIX4, 440MX Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100 ATI IXP200, IXP300, IXP400, SB600, SB700, SB800 + AMD SB900 SMSC Victory66 Note: we assume there can only be one device, with one SMBus interface. @@ -479,6 +480,7 @@ static struct pci_device_id piix4_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) }, + { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_SB900_SMBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4) }, { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, @@ -499,9 +501,10 @@ static int __devinit piix4_probe(struct pci_dev *dev, { int retval; - if ((dev->vendor == PCI_VENDOR_ID_ATI) && - (dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) && - (dev->revision >= 0x40)) + if ((dev->vendor == PCI_VENDOR_ID_ATI && + dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS && + dev->revision >= 0x40) || + dev->vendor == PCI_VENDOR_ID_AMD) /* base address location etc changed in SB800 */ retval = piix4_setup_sb800(dev, id); else diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 3b6b788..7803565 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h @@ -543,6 +543,7 @@ #define PCI_DEVICE_ID_AMD_8131_BRIDGE 0x7450 #define PCI_DEVICE_ID_AMD_8131_APIC 0x7451 #define PCI_DEVICE_ID_AMD_8132_BRIDGE 0x7458 +#define PCI_DEVICE_ID_AMD_SB900_SMBUS 0x780b #define PCI_DEVICE_ID_AMD_CS5535_IDE 0x208F #define PCI_DEVICE_ID_AMD_CS5536_ISA 0x2090 #define PCI_DEVICE_ID_AMD_CS5536_FLASH 0x2091 -- cgit v0.10.2 From a1867d36b3bda28314fdd832a510dc9e55821c4c Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Fri, 18 Sep 2009 22:45:51 +0200 Subject: MAINTAINERS: Add maintainer for AT24 and PCA9564/PCA9665 Add me as the maintainer for the i2c drivers I feel responsible for as I found patches going mainline I missed due to no Cc. Signed-off-by: Wolfram Sang Cc: David Brownell Signed-off-by: Jean Delvare diff --git a/MAINTAINERS b/MAINTAINERS index e613c6dd..9a1cd2f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -894,6 +894,13 @@ F: drivers/dma/ F: include/linux/dmaengine.h F: include/linux/async_tx.h +AT24 EEPROM DRIVER +M: Wolfram Sang +L: linux-i2c@vger.kernel.org +S: Maintained +F: drivers/misc/eeprom/at24.c +F: include/linux/i2c/at24.h + ATA OVER ETHERNET (AOE) DRIVER M: "Ed L. Cashin" W: http://www.coraid.com/support/linux @@ -3957,6 +3964,15 @@ S: Maintained F: drivers/leds/leds-pca9532.c F: include/linux/leds-pca9532.h +PCA9564/PCA9665 I2C BUS DRIVER +M: Wolfram Sang +L: linux-i2c@vger.kernel.org +S: Maintained +F: drivers/i2c/algos/i2c-algo-pca.c +F: drivers/i2c/busses/i2c-pca-* +F: include/linux/i2c-algo-pca.h +F: include/linux/i2c-pca-platform.h + PCI ERROR RECOVERY M: Linas Vepstas L: linux-pci@vger.kernel.org -- cgit v0.10.2 From 449d2c759ddba46a89b698bdc64bfc2f7cc5bb66 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Fri, 18 Sep 2009 22:45:51 +0200 Subject: i2c-pnx: Correct use of request_region/request_mem_region request_mem_region should be used when ioremap is used subsequently. release_region is then correspondingly replaced by release_mem_region. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // @r@ expression start,E; @@ - request_region + request_mem_region (start,...) ... when != request_mem_region(start,...) when != start = E ioremap(start,...) @@ expression r.start; @@ - release_region + release_mem_region (start,...) // Signed-off-by: Julia Lawall Cc: Vitaly Wool Signed-off-by: Jean Delvare diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c index ec15cff..6ff6c20 100644 --- a/drivers/i2c/busses/i2c-pnx.c +++ b/drivers/i2c/busses/i2c-pnx.c @@ -586,7 +586,8 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev) alg_data->mif.timer.data = (unsigned long)i2c_pnx->adapter; /* Register I/O resource */ - if (!request_region(alg_data->base, I2C_PNX_REGION_SIZE, pdev->name)) { + if (!request_mem_region(alg_data->base, I2C_PNX_REGION_SIZE, + pdev->name)) { dev_err(&pdev->dev, "I/O region 0x%08x for I2C already in use.\n", alg_data->base); @@ -650,7 +651,7 @@ out_clock: out_unmap: iounmap((void *)alg_data->ioaddr); out_release: - release_region(alg_data->base, I2C_PNX_REGION_SIZE); + release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE); out_drvdata: platform_set_drvdata(pdev, NULL); out: @@ -667,7 +668,7 @@ static int __devexit i2c_pnx_remove(struct platform_device *pdev) i2c_del_adapter(adap); i2c_pnx->set_clock_stop(pdev); iounmap((void *)alg_data->ioaddr); - release_region(alg_data->base, I2C_PNX_REGION_SIZE); + release_mem_region(alg_data->base, I2C_PNX_REGION_SIZE); platform_set_drvdata(pdev, NULL); return 0; -- cgit v0.10.2 From dc9854212e0d7318d7133697906d98b78f3088b6 Mon Sep 17 00:00:00 2001 From: Crane Cai Date: Fri, 18 Sep 2009 22:45:51 +0200 Subject: i2c: Add driver for SMBus Control Method Interface This driver supports the SMBus Control Method Interface. It needs BIOS declare ACPI control methods which described in SMBus Control Method Interface Spec. http://smbus.org/specs/smbus_cmi10.pdf Signed-off-by: Crane Cai Signed-off-by: Jean Delvare diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index bb216c5..838bd1e 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -762,4 +762,15 @@ config SCx200_ACB This support is also available as a module. If so, the module will be called scx200_acb. +config I2C_SCMI + tristate "SMBus Control Method Interface" + depends on ACPI + help + This driver supports the SMBus Control Method Interface. It needs the + BIOS to declare ACPI control methods as described in the SMBus Control + Method Interface specification. + + To compile this driver as a module, choose M here: + the module will be called i2c-scmi. + endmenu diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index e654263b..060da43 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -2,6 +2,9 @@ # Makefile for the i2c bus drivers. # +# SMBus CMI driver +obj-$(CONFIG_I2C_SCMI) += i2c-scmi.o + # PC SMBus host controller drivers obj-$(CONFIG_I2C_ALI1535) += i2c-ali1535.o obj-$(CONFIG_I2C_ALI1563) += i2c-ali1563.o diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c new file mode 100644 index 0000000..276a046 --- /dev/null +++ b/drivers/i2c/busses/i2c-scmi.c @@ -0,0 +1,430 @@ +/* + * SMBus driver for ACPI SMBus CMI + * + * Copyright (C) 2009 Crane Cai + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation version 2. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define ACPI_SMBUS_HC_CLASS "smbus" +#define ACPI_SMBUS_HC_DEVICE_NAME "cmi" + +ACPI_MODULE_NAME("smbus_cmi"); + +struct smbus_methods_t { + char *mt_info; + char *mt_sbr; + char *mt_sbw; +}; + +struct acpi_smbus_cmi { + acpi_handle handle; + struct i2c_adapter adapter; + u8 cap_info:1; + u8 cap_read:1; + u8 cap_write:1; +}; + +static const struct smbus_methods_t smbus_methods = { + .mt_info = "_SBI", + .mt_sbr = "_SBR", + .mt_sbw = "_SBW", +}; + +static const struct acpi_device_id acpi_smbus_cmi_ids[] = { + {"SMBUS01", 0}, + {"", 0} +}; + +#define ACPI_SMBUS_STATUS_OK 0x00 +#define ACPI_SMBUS_STATUS_FAIL 0x07 +#define ACPI_SMBUS_STATUS_DNAK 0x10 +#define ACPI_SMBUS_STATUS_DERR 0x11 +#define ACPI_SMBUS_STATUS_CMD_DENY 0x12 +#define ACPI_SMBUS_STATUS_UNKNOWN 0x13 +#define ACPI_SMBUS_STATUS_ACC_DENY 0x17 +#define ACPI_SMBUS_STATUS_TIMEOUT 0x18 +#define ACPI_SMBUS_STATUS_NOTSUP 0x19 +#define ACPI_SMBUS_STATUS_BUSY 0x1a +#define ACPI_SMBUS_STATUS_PEC 0x1f + +#define ACPI_SMBUS_PRTCL_WRITE 0x00 +#define ACPI_SMBUS_PRTCL_READ 0x01 +#define ACPI_SMBUS_PRTCL_QUICK 0x02 +#define ACPI_SMBUS_PRTCL_BYTE 0x04 +#define ACPI_SMBUS_PRTCL_BYTE_DATA 0x06 +#define ACPI_SMBUS_PRTCL_WORD_DATA 0x08 +#define ACPI_SMBUS_PRTCL_BLOCK_DATA 0x0a + + +static int +acpi_smbus_cmi_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, + char read_write, u8 command, int size, + union i2c_smbus_data *data) +{ + int result = 0; + struct acpi_smbus_cmi *smbus_cmi = adap->algo_data; + unsigned char protocol; + acpi_status status = 0; + struct acpi_object_list input; + union acpi_object mt_params[5]; + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + union acpi_object *pkg; + char *method; + int len = 0; + + dev_dbg(&adap->dev, "access size: %d %s\n", size, + (read_write) ? "READ" : "WRITE"); + switch (size) { + case I2C_SMBUS_QUICK: + protocol = ACPI_SMBUS_PRTCL_QUICK; + command = 0; + if (read_write == I2C_SMBUS_WRITE) { + mt_params[3].type = ACPI_TYPE_INTEGER; + mt_params[3].integer.value = 0; + mt_params[4].type = ACPI_TYPE_INTEGER; + mt_params[4].integer.value = 0; + } + break; + + case I2C_SMBUS_BYTE: + protocol = ACPI_SMBUS_PRTCL_BYTE; + if (read_write == I2C_SMBUS_WRITE) { + mt_params[3].type = ACPI_TYPE_INTEGER; + mt_params[3].integer.value = 0; + mt_params[4].type = ACPI_TYPE_INTEGER; + mt_params[4].integer.value = 0; + } else { + command = 0; + } + break; + + case I2C_SMBUS_BYTE_DATA: + protocol = ACPI_SMBUS_PRTCL_BYTE_DATA; + if (read_write == I2C_SMBUS_WRITE) { + mt_params[3].type = ACPI_TYPE_INTEGER; + mt_params[3].integer.value = 1; + mt_params[4].type = ACPI_TYPE_INTEGER; + mt_params[4].integer.value = data->byte; + } + break; + + case I2C_SMBUS_WORD_DATA: + protocol = ACPI_SMBUS_PRTCL_WORD_DATA; + if (read_write == I2C_SMBUS_WRITE) { + mt_params[3].type = ACPI_TYPE_INTEGER; + mt_params[3].integer.value = 2; + mt_params[4].type = ACPI_TYPE_INTEGER; + mt_params[4].integer.value = data->word; + } + break; + + case I2C_SMBUS_BLOCK_DATA: + protocol = ACPI_SMBUS_PRTCL_BLOCK_DATA; + if (read_write == I2C_SMBUS_WRITE) { + len = data->block[0]; + if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + mt_params[3].type = ACPI_TYPE_INTEGER; + mt_params[3].integer.value = len; + mt_params[4].type = ACPI_TYPE_BUFFER; + mt_params[4].buffer.pointer = data->block + 1; + } + break; + + default: + dev_warn(&adap->dev, "Unsupported transaction %d\n", size); + return -EOPNOTSUPP; + } + + if (read_write == I2C_SMBUS_READ) { + protocol |= ACPI_SMBUS_PRTCL_READ; + method = smbus_methods.mt_sbr; + input.count = 3; + } else { + protocol |= ACPI_SMBUS_PRTCL_WRITE; + method = smbus_methods.mt_sbw; + input.count = 5; + } + + input.pointer = mt_params; + mt_params[0].type = ACPI_TYPE_INTEGER; + mt_params[0].integer.value = protocol; + mt_params[1].type = ACPI_TYPE_INTEGER; + mt_params[1].integer.value = addr; + mt_params[2].type = ACPI_TYPE_INTEGER; + mt_params[2].integer.value = command; + + status = acpi_evaluate_object(smbus_cmi->handle, method, &input, + &buffer); + if (ACPI_FAILURE(status)) { + ACPI_ERROR((AE_INFO, "Evaluating %s: %i", method, status)); + return -EIO; + } + + pkg = buffer.pointer; + if (pkg && pkg->type == ACPI_TYPE_PACKAGE) + obj = pkg->package.elements; + else { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + result = -EIO; + goto out; + } + if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + result = -EIO; + goto out; + } + + result = obj->integer.value; + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s return status: %i\n", + method, result)); + + switch (result) { + case ACPI_SMBUS_STATUS_OK: + result = 0; + break; + case ACPI_SMBUS_STATUS_BUSY: + result = -EBUSY; + goto out; + case ACPI_SMBUS_STATUS_TIMEOUT: + result = -ETIMEDOUT; + goto out; + case ACPI_SMBUS_STATUS_DNAK: + result = -ENXIO; + goto out; + default: + result = -EIO; + goto out; + } + + if (read_write == I2C_SMBUS_WRITE || size == I2C_SMBUS_QUICK) + goto out; + + obj = pkg->package.elements + 1; + if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + result = -EIO; + goto out; + } + + len = obj->integer.value; + obj = pkg->package.elements + 2; + switch (size) { + case I2C_SMBUS_BYTE: + case I2C_SMBUS_BYTE_DATA: + case I2C_SMBUS_WORD_DATA: + if (obj == NULL || obj->type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + result = -EIO; + goto out; + } + if (len == 2) + data->word = obj->integer.value; + else + data->byte = obj->integer.value; + break; + case I2C_SMBUS_BLOCK_DATA: + if (obj == NULL || obj->type != ACPI_TYPE_BUFFER) { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + result = -EIO; + goto out; + } + if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) + return -EPROTO; + data->block[0] = len; + memcpy(data->block + 1, obj->buffer.pointer, len); + break; + } + +out: + kfree(buffer.pointer); + dev_dbg(&adap->dev, "Transaction status: %i\n", result); + return result; +} + +static u32 acpi_smbus_cmi_func(struct i2c_adapter *adapter) +{ + struct acpi_smbus_cmi *smbus_cmi = adapter->algo_data; + u32 ret; + + ret = smbus_cmi->cap_read | smbus_cmi->cap_write ? + I2C_FUNC_SMBUS_QUICK : 0; + + ret |= smbus_cmi->cap_read ? + (I2C_FUNC_SMBUS_READ_BYTE | + I2C_FUNC_SMBUS_READ_BYTE_DATA | + I2C_FUNC_SMBUS_READ_WORD_DATA | + I2C_FUNC_SMBUS_READ_BLOCK_DATA) : 0; + + ret |= smbus_cmi->cap_write ? + (I2C_FUNC_SMBUS_WRITE_BYTE | + I2C_FUNC_SMBUS_WRITE_BYTE_DATA | + I2C_FUNC_SMBUS_WRITE_WORD_DATA | + I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) : 0; + + return ret; +} + +static const struct i2c_algorithm acpi_smbus_cmi_algorithm = { + .smbus_xfer = acpi_smbus_cmi_access, + .functionality = acpi_smbus_cmi_func, +}; + + +static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi, + const char *name) +{ + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *obj; + acpi_status status; + + if (!strcmp(name, smbus_methods.mt_info)) { + status = acpi_evaluate_object(smbus_cmi->handle, + smbus_methods.mt_info, + NULL, &buffer); + if (ACPI_FAILURE(status)) { + ACPI_ERROR((AE_INFO, "Evaluating %s: %i", + smbus_methods.mt_info, status)); + return -EIO; + } + + obj = buffer.pointer; + if (obj && obj->type == ACPI_TYPE_PACKAGE) + obj = obj->package.elements; + else { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + kfree(buffer.pointer); + return -EIO; + } + + if (obj->type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, "Invalid argument type")); + kfree(buffer.pointer); + return -EIO; + } else + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "SMBus CMI Version %x" + "\n", (int)obj->integer.value)); + + kfree(buffer.pointer); + smbus_cmi->cap_info = 1; + } else if (!strcmp(name, smbus_methods.mt_sbr)) + smbus_cmi->cap_read = 1; + else if (!strcmp(name, smbus_methods.mt_sbw)) + smbus_cmi->cap_write = 1; + else + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported CMI method: %s\n", + name)); + + return 0; +} + +static acpi_status acpi_smbus_cmi_query_methods(acpi_handle handle, u32 level, + void *context, void **return_value) +{ + char node_name[5]; + struct acpi_buffer buffer = { sizeof(node_name), node_name }; + struct acpi_smbus_cmi *smbus_cmi = context; + acpi_status status; + + status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); + + if (ACPI_SUCCESS(status)) + acpi_smbus_cmi_add_cap(smbus_cmi, node_name); + + return AE_OK; +} + +static int acpi_smbus_cmi_add(struct acpi_device *device) +{ + struct acpi_smbus_cmi *smbus_cmi; + + smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL); + if (!smbus_cmi) + return -ENOMEM; + + smbus_cmi->handle = device->handle; + strcpy(acpi_device_name(device), ACPI_SMBUS_HC_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_SMBUS_HC_CLASS); + device->driver_data = smbus_cmi; + smbus_cmi->cap_info = 0; + smbus_cmi->cap_read = 0; + smbus_cmi->cap_write = 0; + + acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1, + acpi_smbus_cmi_query_methods, smbus_cmi, NULL); + + if (smbus_cmi->cap_info == 0) + goto err; + + snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name), + "SMBus CMI adapter %s (%s)", + acpi_device_name(device), + acpi_device_uid(device)); + smbus_cmi->adapter.owner = THIS_MODULE; + smbus_cmi->adapter.algo = &acpi_smbus_cmi_algorithm; + smbus_cmi->adapter.algo_data = smbus_cmi; + smbus_cmi->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD; + smbus_cmi->adapter.dev.parent = &device->dev; + + if (i2c_add_adapter(&smbus_cmi->adapter)) { + dev_err(&device->dev, "Couldn't register adapter!\n"); + goto err; + } + + return 0; + +err: + kfree(smbus_cmi); + device->driver_data = NULL; + return -EIO; +} + +static int acpi_smbus_cmi_remove(struct acpi_device *device, int type) +{ + struct acpi_smbus_cmi *smbus_cmi = acpi_driver_data(device); + + i2c_del_adapter(&smbus_cmi->adapter); + kfree(smbus_cmi); + device->driver_data = NULL; + + return 0; +} + +static struct acpi_driver acpi_smbus_cmi_driver = { + .name = ACPI_SMBUS_HC_DEVICE_NAME, + .class = ACPI_SMBUS_HC_CLASS, + .ids = acpi_smbus_cmi_ids, + .ops = { + .add = acpi_smbus_cmi_add, + .remove = acpi_smbus_cmi_remove, + }, +}; + +static int __init acpi_smbus_cmi_init(void) +{ + return acpi_bus_register_driver(&acpi_smbus_cmi_driver); +} + +static void __exit acpi_smbus_cmi_exit(void) +{ + acpi_bus_unregister_driver(&acpi_smbus_cmi_driver); +} + +module_init(acpi_smbus_cmi_init); +module_exit(acpi_smbus_cmi_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Crane Cai "); +MODULE_DESCRIPTION("ACPI SMBus CMI driver"); -- cgit v0.10.2 From cfd550ed3d3bd509b475c7a9d425fc63bf843a7c Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Fri, 18 Sep 2009 22:45:52 +0200 Subject: i2c: Clearly mark ACPI drivers as such Now that we have ACPI-based SMBus controller drivers, and we will start telling users to use them instead of native drivers when I/O resources conflict, I think it would be good to clearly mark ACPI drivers as such in Kconfig. This is exactly the same as we just did for hwmon drivers. Signed-off-by: Jean Delvare Cc: Crane Cai diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 838bd1e..6bedd2f 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -232,6 +232,22 @@ config I2C_VIAPRO This driver can also be built as a module. If so, the module will be called i2c-viapro. +if ACPI + +comment "ACPI drivers" + +config I2C_SCMI + tristate "SMBus Control Method Interface" + help + This driver supports the SMBus Control Method Interface. It needs the + BIOS to declare ACPI control methods as described in the SMBus Control + Method Interface specification. + + To compile this driver as a module, choose M here: + the module will be called i2c-scmi. + +endif # ACPI + comment "Mac SMBus host controller drivers" depends on PPC_CHRP || PPC_PMAC @@ -762,15 +778,4 @@ config SCx200_ACB This support is also available as a module. If so, the module will be called scx200_acb. -config I2C_SCMI - tristate "SMBus Control Method Interface" - depends on ACPI - help - This driver supports the SMBus Control Method Interface. It needs the - BIOS to declare ACPI control methods as described in the SMBus Control - Method Interface specification. - - To compile this driver as a module, choose M here: - the module will be called i2c-scmi. - endmenu diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index 060da43..ff937ac 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -2,7 +2,7 @@ # Makefile for the i2c bus drivers. # -# SMBus CMI driver +# ACPI drivers obj-$(CONFIG_I2C_SCMI) += i2c-scmi.o # PC SMBus host controller drivers -- cgit v0.10.2