From 2e157888f132131f8877affd2785dcee4c227c1d Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Mon, 26 Jan 2009 21:19:53 +0100 Subject: i2c: Move old eeprom driver to /drivers/misc/eeprom Update Kconfig text to specify this driver as I2C. Signed-off-by: Wolfram Sang Signed-off-by: Jean Delvare diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index b58e770..c80312c 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -16,17 +16,6 @@ config DS1682 This driver can also be built as a module. If so, the module will be called ds1682. -config SENSORS_EEPROM - tristate "EEPROM reader" - depends on EXPERIMENTAL - help - If you say yes here you get read-only access to the EEPROM data - available on modern memory DIMMs and Sony Vaio laptops. Such - EEPROMs could theoretically be available on other devices as well. - - This driver can also be built as a module. If so, the module - will be called eeprom. - config SENSORS_PCF8574 tristate "Philips PCF8574 and PCF8574A (DEPRECATED)" depends on EXPERIMENTAL && GPIO_PCF857X = "n" diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index 5c14776..d142f23 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -11,7 +11,6 @@ # obj-$(CONFIG_DS1682) += ds1682.o -obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o obj-$(CONFIG_SENSORS_MAX6875) += max6875.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c deleted file mode 100644 index 2c27193..0000000 --- a/drivers/i2c/chips/eeprom.c +++ /dev/null @@ -1,257 +0,0 @@ -/* - Copyright (C) 1998, 1999 Frodo Looijaard and - Philip Edelbrock - Copyright (C) 2003 Greg Kroah-Hartman - Copyright (C) 2003 IBM Corp. - Copyright (C) 2004 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. -*/ - -#include -#include -#include -#include -#include -#include -#include - -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54, - 0x55, 0x56, 0x57, I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_1(eeprom); - - -/* Size of EEPROM in bytes */ -#define EEPROM_SIZE 256 - -/* possible types of eeprom devices */ -enum eeprom_nature { - UNKNOWN, - VAIO, -}; - -/* Each client has this additional data */ -struct eeprom_data { - struct mutex update_lock; - u8 valid; /* bitfield, bit!=0 if slice is valid */ - unsigned long last_updated[8]; /* In jiffies, 8 slices */ - u8 data[EEPROM_SIZE]; /* Register values */ - enum eeprom_nature nature; -}; - - -static void eeprom_update_client(struct i2c_client *client, u8 slice) -{ - struct eeprom_data *data = i2c_get_clientdata(client); - int i; - - mutex_lock(&data->update_lock); - - if (!(data->valid & (1 << slice)) || - time_after(jiffies, data->last_updated[slice] + 300 * HZ)) { - dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice); - - if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - for (i = slice << 5; i < (slice + 1) << 5; i += 32) - if (i2c_smbus_read_i2c_block_data(client, i, - 32, data->data + i) - != 32) - goto exit; - } else { - for (i = slice << 5; i < (slice + 1) << 5; i += 2) { - int word = i2c_smbus_read_word_data(client, i); - if (word < 0) - goto exit; - data->data[i] = word & 0xff; - data->data[i + 1] = word >> 8; - } - } - data->last_updated[slice] = jiffies; - data->valid |= (1 << slice); - } -exit: - mutex_unlock(&data->update_lock); -} - -static ssize_t eeprom_read(struct kobject *kobj, struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) -{ - struct i2c_client *client = to_i2c_client(container_of(kobj, struct device, kobj)); - struct eeprom_data *data = i2c_get_clientdata(client); - u8 slice; - - if (off > EEPROM_SIZE) - return 0; - if (off + count > EEPROM_SIZE) - count = EEPROM_SIZE - off; - - /* Only refresh slices which contain requested bytes */ - for (slice = off >> 5; slice <= (off + count - 1) >> 5; slice++) - eeprom_update_client(client, slice); - - /* Hide Vaio private settings to regular users: - - BIOS passwords: bytes 0x00 to 0x0f - - UUID: bytes 0x10 to 0x1f - - Serial number: 0xc0 to 0xdf */ - if (data->nature == VAIO && !capable(CAP_SYS_ADMIN)) { - int i; - - for (i = 0; i < count; i++) { - if ((off + i <= 0x1f) || - (off + i >= 0xc0 && off + i <= 0xdf)) - buf[i] = 0; - else - buf[i] = data->data[off + i]; - } - } else { - memcpy(buf, &data->data[off], count); - } - - return count; -} - -static struct bin_attribute eeprom_attr = { - .attr = { - .name = "eeprom", - .mode = S_IRUGO, - }, - .size = EEPROM_SIZE, - .read = eeprom_read, -}; - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int eeprom_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - /* EDID EEPROMs are often 24C00 EEPROMs, which answer to all - addresses 0x50-0x57, but we only care about 0x50. So decline - attaching to addresses >= 0x51 on DDC buses */ - if (!(adapter->class & I2C_CLASS_SPD) && client->addr >= 0x51) - return -ENODEV; - - /* There are four ways we can read the EEPROM data: - (1) I2C block reads (faster, but unsupported by most adapters) - (2) Word reads (128% overhead) - (3) Consecutive byte reads (88% overhead, unsafe) - (4) Regular byte data reads (265% overhead) - The third and fourth methods are not implemented by this driver - because all known adapters support one of the first two. */ - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA) - && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) - return -ENODEV; - - strlcpy(info->type, "eeprom", I2C_NAME_SIZE); - - return 0; -} - -static int eeprom_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct i2c_adapter *adapter = client->adapter; - struct eeprom_data *data; - int err; - - if (!(data = kzalloc(sizeof(struct eeprom_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit; - } - - memset(data->data, 0xff, EEPROM_SIZE); - i2c_set_clientdata(client, data); - mutex_init(&data->update_lock); - data->nature = UNKNOWN; - - /* Detect the Vaio nature of EEPROMs. - We use the "PCG-" or "VGN-" prefix as the signature. */ - if (client->addr == 0x57 - && i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { - char name[4]; - - name[0] = i2c_smbus_read_byte_data(client, 0x80); - name[1] = i2c_smbus_read_byte_data(client, 0x81); - name[2] = i2c_smbus_read_byte_data(client, 0x82); - name[3] = i2c_smbus_read_byte_data(client, 0x83); - - if (!memcmp(name, "PCG-", 4) || !memcmp(name, "VGN-", 4)) { - dev_info(&client->dev, "Vaio EEPROM detected, " - "enabling privacy protection\n"); - data->nature = VAIO; - } - } - - /* create the sysfs eeprom file */ - err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr); - if (err) - goto exit_kfree; - - return 0; - -exit_kfree: - kfree(data); -exit: - return err; -} - -static int eeprom_remove(struct i2c_client *client) -{ - sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr); - kfree(i2c_get_clientdata(client)); - - return 0; -} - -static const struct i2c_device_id eeprom_id[] = { - { "eeprom", 0 }, - { } -}; - -static struct i2c_driver eeprom_driver = { - .driver = { - .name = "eeprom", - }, - .probe = eeprom_probe, - .remove = eeprom_remove, - .id_table = eeprom_id, - - .class = I2C_CLASS_DDC | I2C_CLASS_SPD, - .detect = eeprom_detect, - .address_data = &addr_data, -}; - -static int __init eeprom_init(void) -{ - return i2c_add_driver(&eeprom_driver); -} - -static void __exit eeprom_exit(void) -{ - i2c_del_driver(&eeprom_driver); -} - - -MODULE_AUTHOR("Frodo Looijaard and " - "Philip Edelbrock and " - "Greg Kroah-Hartman "); -MODULE_DESCRIPTION("I2C EEPROM driver"); -MODULE_LICENSE("GPL"); - -module_init(eeprom_init); -module_exit(eeprom_exit); diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index 0b21778..3d31b66 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -26,4 +26,15 @@ config AT24 This driver can also be built as a module. If so, the module will be called at24. +config SENSORS_EEPROM + tristate "Old I2C EEPROM reader" + depends on I2C && EXPERIMENTAL + help + If you say yes here you get read-only access to the EEPROM data + available on modern memory DIMMs and Sony Vaio laptops via I2C. Such + EEPROMs could theoretically be available on other devices as well. + + This driver can also be built as a module. If so, the module + will be called eeprom. + endmenu diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile index 72cd478..a3dad28 100644 --- a/drivers/misc/eeprom/Makefile +++ b/drivers/misc/eeprom/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_AT24) += at24.o +obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o diff --git a/drivers/misc/eeprom/eeprom.c b/drivers/misc/eeprom/eeprom.c new file mode 100644 index 0000000..2c27193 --- /dev/null +++ b/drivers/misc/eeprom/eeprom.c @@ -0,0 +1,257 @@ +/* + Copyright (C) 1998, 1999 Frodo Looijaard and + Philip Edelbrock + Copyright (C) 2003 Greg Kroah-Hartman + Copyright (C) 2003 IBM Corp. + Copyright (C) 2004 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. +*/ + +#include +#include +#include +#include +#include +#include +#include + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54, + 0x55, 0x56, 0x57, I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(eeprom); + + +/* Size of EEPROM in bytes */ +#define EEPROM_SIZE 256 + +/* possible types of eeprom devices */ +enum eeprom_nature { + UNKNOWN, + VAIO, +}; + +/* Each client has this additional data */ +struct eeprom_data { + struct mutex update_lock; + u8 valid; /* bitfield, bit!=0 if slice is valid */ + unsigned long last_updated[8]; /* In jiffies, 8 slices */ + u8 data[EEPROM_SIZE]; /* Register values */ + enum eeprom_nature nature; +}; + + +static void eeprom_update_client(struct i2c_client *client, u8 slice) +{ + struct eeprom_data *data = i2c_get_clientdata(client); + int i; + + mutex_lock(&data->update_lock); + + if (!(data->valid & (1 << slice)) || + time_after(jiffies, data->last_updated[slice] + 300 * HZ)) { + dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice); + + if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { + for (i = slice << 5; i < (slice + 1) << 5; i += 32) + if (i2c_smbus_read_i2c_block_data(client, i, + 32, data->data + i) + != 32) + goto exit; + } else { + for (i = slice << 5; i < (slice + 1) << 5; i += 2) { + int word = i2c_smbus_read_word_data(client, i); + if (word < 0) + goto exit; + data->data[i] = word & 0xff; + data->data[i + 1] = word >> 8; + } + } + data->last_updated[slice] = jiffies; + data->valid |= (1 << slice); + } +exit: + mutex_unlock(&data->update_lock); +} + +static ssize_t eeprom_read(struct kobject *kobj, struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct i2c_client *client = to_i2c_client(container_of(kobj, struct device, kobj)); + struct eeprom_data *data = i2c_get_clientdata(client); + u8 slice; + + if (off > EEPROM_SIZE) + return 0; + if (off + count > EEPROM_SIZE) + count = EEPROM_SIZE - off; + + /* Only refresh slices which contain requested bytes */ + for (slice = off >> 5; slice <= (off + count - 1) >> 5; slice++) + eeprom_update_client(client, slice); + + /* Hide Vaio private settings to regular users: + - BIOS passwords: bytes 0x00 to 0x0f + - UUID: bytes 0x10 to 0x1f + - Serial number: 0xc0 to 0xdf */ + if (data->nature == VAIO && !capable(CAP_SYS_ADMIN)) { + int i; + + for (i = 0; i < count; i++) { + if ((off + i <= 0x1f) || + (off + i >= 0xc0 && off + i <= 0xdf)) + buf[i] = 0; + else + buf[i] = data->data[off + i]; + } + } else { + memcpy(buf, &data->data[off], count); + } + + return count; +} + +static struct bin_attribute eeprom_attr = { + .attr = { + .name = "eeprom", + .mode = S_IRUGO, + }, + .size = EEPROM_SIZE, + .read = eeprom_read, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int eeprom_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + + /* EDID EEPROMs are often 24C00 EEPROMs, which answer to all + addresses 0x50-0x57, but we only care about 0x50. So decline + attaching to addresses >= 0x51 on DDC buses */ + if (!(adapter->class & I2C_CLASS_SPD) && client->addr >= 0x51) + return -ENODEV; + + /* There are four ways we can read the EEPROM data: + (1) I2C block reads (faster, but unsupported by most adapters) + (2) Word reads (128% overhead) + (3) Consecutive byte reads (88% overhead, unsafe) + (4) Regular byte data reads (265% overhead) + The third and fourth methods are not implemented by this driver + because all known adapters support one of the first two. */ + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA) + && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) + return -ENODEV; + + strlcpy(info->type, "eeprom", I2C_NAME_SIZE); + + return 0; +} + +static int eeprom_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = client->adapter; + struct eeprom_data *data; + int err; + + if (!(data = kzalloc(sizeof(struct eeprom_data), GFP_KERNEL))) { + err = -ENOMEM; + goto exit; + } + + memset(data->data, 0xff, EEPROM_SIZE); + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + data->nature = UNKNOWN; + + /* Detect the Vaio nature of EEPROMs. + We use the "PCG-" or "VGN-" prefix as the signature. */ + if (client->addr == 0x57 + && i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { + char name[4]; + + name[0] = i2c_smbus_read_byte_data(client, 0x80); + name[1] = i2c_smbus_read_byte_data(client, 0x81); + name[2] = i2c_smbus_read_byte_data(client, 0x82); + name[3] = i2c_smbus_read_byte_data(client, 0x83); + + if (!memcmp(name, "PCG-", 4) || !memcmp(name, "VGN-", 4)) { + dev_info(&client->dev, "Vaio EEPROM detected, " + "enabling privacy protection\n"); + data->nature = VAIO; + } + } + + /* create the sysfs eeprom file */ + err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr); + if (err) + goto exit_kfree; + + return 0; + +exit_kfree: + kfree(data); +exit: + return err; +} + +static int eeprom_remove(struct i2c_client *client) +{ + sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr); + kfree(i2c_get_clientdata(client)); + + return 0; +} + +static const struct i2c_device_id eeprom_id[] = { + { "eeprom", 0 }, + { } +}; + +static struct i2c_driver eeprom_driver = { + .driver = { + .name = "eeprom", + }, + .probe = eeprom_probe, + .remove = eeprom_remove, + .id_table = eeprom_id, + + .class = I2C_CLASS_DDC | I2C_CLASS_SPD, + .detect = eeprom_detect, + .address_data = &addr_data, +}; + +static int __init eeprom_init(void) +{ + return i2c_add_driver(&eeprom_driver); +} + +static void __exit eeprom_exit(void) +{ + i2c_del_driver(&eeprom_driver); +} + + +MODULE_AUTHOR("Frodo Looijaard and " + "Philip Edelbrock and " + "Greg Kroah-Hartman "); +MODULE_DESCRIPTION("I2C EEPROM driver"); +MODULE_LICENSE("GPL"); + +module_init(eeprom_init); +module_exit(eeprom_exit); -- cgit v0.10.2