diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/common/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/iio/common/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/Makefile | 10 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_buffer.c | 116 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_core.c | 460 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_i2c.c | 81 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_spi.c | 128 | ||||
| -rw-r--r-- | drivers/iio/common/st_sensors/st_sensors_trigger.c | 77 |
9 files changed, 888 insertions, 0 deletions
diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig index ed45ee5..0b6e97d1 100644 --- a/drivers/iio/common/Kconfig +++ b/drivers/iio/common/Kconfig @@ -3,3 +3,4 @@ # source "drivers/iio/common/hid-sensors/Kconfig" +source "drivers/iio/common/st_sensors/Kconfig" diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile index 8158400..c2352be 100644 --- a/drivers/iio/common/Makefile +++ b/drivers/iio/common/Makefile @@ -7,3 +7,4 @@ # obj-y += hid-sensors/ +obj-y += st_sensors/ diff --git a/drivers/iio/common/st_sensors/Kconfig b/drivers/iio/common/st_sensors/Kconfig new file mode 100644 index 0000000..865f1ca --- /dev/null +++ b/drivers/iio/common/st_sensors/Kconfig @@ -0,0 +1,14 @@ +# +# STMicroelectronics sensors common library +# + +config IIO_ST_SENSORS_I2C + tristate + +config IIO_ST_SENSORS_SPI + tristate + +config IIO_ST_SENSORS_CORE + tristate + select IIO_ST_SENSORS_I2C if I2C + select IIO_ST_SENSORS_SPI if SPI_MASTER diff --git a/drivers/iio/common/st_sensors/Makefile b/drivers/iio/common/st_sensors/Makefile new file mode 100644 index 0000000..9f3e24f --- /dev/null +++ b/drivers/iio/common/st_sensors/Makefile @@ -0,0 +1,10 @@ +# +# Makefile for the STMicroelectronics sensor common modules. +# + +obj-$(CONFIG_IIO_ST_SENSORS_I2C) += st_sensors_i2c.o +obj-$(CONFIG_IIO_ST_SENSORS_SPI) += st_sensors_spi.o +obj-$(CONFIG_IIO_ST_SENSORS_CORE) += st_sensors.o +st_sensors-y := st_sensors_core.o +st_sensors-$(CONFIG_IIO_BUFFER) += st_sensors_buffer.o +st_sensors-$(CONFIG_IIO_TRIGGER) += st_sensors_trigger.o diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c new file mode 100644 index 0000000..09b236d --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c @@ -0,0 +1,116 @@ +/* + * STMicroelectronics sensors buffer library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/interrupt.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/irqreturn.h> + +#include <linux/iio/common/st_sensors.h> + + +int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf) +{ + int i, n = 0, len; + u8 addr[ST_SENSORS_NUMBER_DATA_CHANNELS]; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + for (i = 0; i < ST_SENSORS_NUMBER_DATA_CHANNELS; i++) { + if (test_bit(i, indio_dev->active_scan_mask)) { + addr[n] = indio_dev->channels[i].address; + n++; + } + } + switch (n) { + case 1: + len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + addr[0], ST_SENSORS_BYTE_FOR_CHANNEL, buf, + sdata->multiread_bit); + break; + case 2: + if ((addr[1] - addr[0]) == ST_SENSORS_BYTE_FOR_CHANNEL) { + len = sdata->tf->read_multiple_byte(&sdata->tb, + sdata->dev, addr[0], + ST_SENSORS_BYTE_FOR_CHANNEL*n, + buf, sdata->multiread_bit); + } else { + u8 rx_array[ST_SENSORS_BYTE_FOR_CHANNEL* + ST_SENSORS_NUMBER_DATA_CHANNELS]; + len = sdata->tf->read_multiple_byte(&sdata->tb, + sdata->dev, addr[0], + ST_SENSORS_BYTE_FOR_CHANNEL* + ST_SENSORS_NUMBER_DATA_CHANNELS, + rx_array, sdata->multiread_bit); + if (len < 0) + goto read_data_channels_error; + + for (i = 0; i < n * ST_SENSORS_NUMBER_DATA_CHANNELS; + i++) { + if (i < n) + buf[i] = rx_array[i]; + else + buf[i] = rx_array[n + i]; + } + len = ST_SENSORS_BYTE_FOR_CHANNEL*n; + } + break; + case 3: + len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + addr[0], ST_SENSORS_BYTE_FOR_CHANNEL* + ST_SENSORS_NUMBER_DATA_CHANNELS, + buf, sdata->multiread_bit); + break; + default: + len = -EINVAL; + goto read_data_channels_error; + } + if (len != ST_SENSORS_BYTE_FOR_CHANNEL*n) { + len = -EIO; + goto read_data_channels_error; + } + +read_data_channels_error: + return len; +} +EXPORT_SYMBOL(st_sensors_get_buffer_element); + +irqreturn_t st_sensors_trigger_handler(int irq, void *p) +{ + int len; + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data); + if (len < 0) + goto st_sensors_get_buffer_element_error; + + if (indio_dev->scan_timestamp) + *(s64 *)((u8 *)sdata->buffer_data + + ALIGN(len, sizeof(s64))) = pf->timestamp; + + iio_push_to_buffers(indio_dev, sdata->buffer_data); + +st_sensors_get_buffer_element_error: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} +EXPORT_SYMBOL(st_sensors_trigger_handler); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c new file mode 100644 index 0000000..fba6d68 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_core.c @@ -0,0 +1,460 @@ +/* + * STMicroelectronics sensors core library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <asm/unaligned.h> + +#include <linux/iio/common/st_sensors.h> + + +#define ST_SENSORS_WAI_ADDRESS 0x0f + +static int st_sensors_write_data_with_mask(struct iio_dev *indio_dev, + u8 reg_addr, u8 mask, u8 data) +{ + int err; + u8 new_data; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data); + if (err < 0) + goto st_sensors_write_data_with_mask_error; + + new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask)); + err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data); + +st_sensors_write_data_with_mask_error: + return err; +} + +int st_sensors_get_sampling_frequency_avl(struct iio_dev *indio_dev, char *buf) +{ + int i, len = 0; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) { + if (sdata->sensor->odr.odr_avl[i].hz == 0) + break; + + len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", + sdata->sensor->odr.odr_avl[i].hz); + } + mutex_unlock(&indio_dev->mlock); + buf[len - 1] = '\n'; + + return len; +} +EXPORT_SYMBOL(st_sensors_get_sampling_frequency_avl); + +int st_sensors_get_scale_avl(struct iio_dev *indio_dev, char *buf) +{ + int i, len = 0; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { + if (sdata->sensor->fs.fs_avl[i].num == 0) + break; + + len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ", + sdata->sensor->fs.fs_avl[i].gain); + } + mutex_unlock(&indio_dev->mlock); + buf[len - 1] = '\n'; + + return len; +} +EXPORT_SYMBOL(st_sensors_get_scale_avl); + +static int st_sensors_match_odr(struct st_sensors *sensor, + unsigned int odr, struct st_sensor_odr_avl *odr_out) +{ + int i, ret = -EINVAL; + + for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) { + if (sensor->odr.odr_avl[i].hz == 0) + goto st_sensors_match_odr_error; + + if (sensor->odr.odr_avl[i].hz == odr) { + odr_out->hz = sensor->odr.odr_avl[i].hz; + odr_out->value = sensor->odr.odr_avl[i].value; + ret = 0; + break; + } + } + +st_sensors_match_odr_error: + return ret; +} + +int st_sensors_set_odr(struct iio_dev *indio_dev, unsigned int odr) +{ + int err; + struct st_sensor_odr_avl odr_out; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = st_sensors_match_odr(sdata->sensor, odr, &odr_out); + if (err < 0) + goto st_sensors_match_odr_error; + + if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) && + (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) { + if (sdata->enabled == true) { + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->odr.addr, + sdata->sensor->odr.mask, + odr_out.value); + } else { + err = 0; + } + } else { + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->odr.addr, sdata->sensor->odr.mask, + odr_out.value); + } + if (err >= 0) + sdata->odr = odr_out.hz; + +st_sensors_match_odr_error: + return err; +} +EXPORT_SYMBOL(st_sensors_set_odr); + +static int st_sensors_match_fs(struct st_sensors *sensor, + unsigned int fs, int *index_fs_avl) +{ + int i, ret = -EINVAL; + + for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { + if (sensor->fs.fs_avl[i].num == 0) + goto st_sensors_match_odr_error; + + if (sensor->fs.fs_avl[i].num == fs) { + *index_fs_avl = i; + ret = 0; + break; + } + } + +st_sensors_match_odr_error: + return ret; +} + +static int st_sensors_set_fullscale(struct iio_dev *indio_dev, unsigned int fs) +{ + int err, i; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = st_sensors_match_fs(sdata->sensor, fs, &i); + if (err < 0) + goto st_accel_set_fullscale_error; + + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->fs.addr, + sdata->sensor->fs.mask, + sdata->sensor->fs.fs_avl[i].value); + if (err < 0) + goto st_accel_set_fullscale_error; + + sdata->current_fullscale = (struct st_sensor_fullscale_avl *) + &sdata->sensor->fs.fs_avl[i]; + return err; + +st_accel_set_fullscale_error: + dev_err(&indio_dev->dev, "failed to set new fullscale.\n"); + return err; +} + +int st_sensors_set_enable(struct iio_dev *indio_dev, bool enable) +{ + bool found; + u8 tmp_value; + int err = -EINVAL; + struct st_sensor_odr_avl odr_out; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + if (enable) { + found = false; + tmp_value = sdata->sensor->pw.value_on; + if ((sdata->sensor->odr.addr == sdata->sensor->pw.addr) && + (sdata->sensor->odr.mask == sdata->sensor->pw.mask)) { + err = st_sensors_match_odr(sdata->sensor, + sdata->odr, &odr_out); + if (err < 0) + goto set_enable_error; + tmp_value = odr_out.value; + found = true; + } + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->pw.addr, + sdata->sensor->pw.mask, tmp_value); + if (err < 0) + goto set_enable_error; + + sdata->enabled = true; + + if (found) + sdata->odr = odr_out.hz; + } else { + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->pw.addr, + sdata->sensor->pw.mask, + sdata->sensor->pw.value_off); + if (err < 0) + goto set_enable_error; + + sdata->enabled = false; + } + +set_enable_error: + return err; +} +EXPORT_SYMBOL(st_sensors_set_enable); + +int st_sensors_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + return st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->enable_axis.addr, + sdata->sensor->enable_axis.mask, axis_enable); +} +EXPORT_SYMBOL(st_sensors_set_axis_enable); + +int st_sensors_init_sensor(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_init(&sdata->tb.buf_lock); + + err = st_sensors_set_enable(indio_dev, false); + if (err < 0) + goto init_error; + + err = st_sensors_set_fullscale(indio_dev, + sdata->current_fullscale->num); + if (err < 0) + goto init_error; + + err = st_sensors_set_odr(indio_dev, sdata->odr); + if (err < 0) + goto init_error; + + /* set BDU */ + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->bdu.addr, sdata->sensor->bdu.mask, true); + if (err < 0) + goto init_error; + + err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); + +init_error: + return err; +} +EXPORT_SYMBOL(st_sensors_init_sensor); + +int st_sensors_set_dataready_irq(struct iio_dev *indio_dev, bool enable) +{ + int err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + /* Enable/Disable the interrupt generator 1. */ + if (sdata->sensor->drdy_irq.ig1.en_addr > 0) { + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->drdy_irq.ig1.en_addr, + sdata->sensor->drdy_irq.ig1.en_mask, (int)enable); + if (err < 0) + goto st_accel_set_dataready_irq_error; + } + + /* Enable/Disable the interrupt generator for data ready. */ + err = st_sensors_write_data_with_mask(indio_dev, + sdata->sensor->drdy_irq.addr, + sdata->sensor->drdy_irq.mask, (int)enable); + +st_accel_set_dataready_irq_error: + return err; +} +EXPORT_SYMBOL(st_sensors_set_dataready_irq); + +int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev, int scale) +{ + int err = -EINVAL, i; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) { + if ((sdata->sensor->fs.fs_avl[i].gain == scale) && + (sdata->sensor->fs.fs_avl[i].gain != 0)) { + err = 0; + break; + } + } + if (err < 0) + goto st_sensors_match_scale_error; + + err = st_sensors_set_fullscale(indio_dev, + sdata->sensor->fs.fs_avl[i].num); + +st_sensors_match_scale_error: + return err; +} +EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain); + +static int st_sensors_read_axis_data(struct iio_dev *indio_dev, + u8 ch_addr, int *data) +{ + int err; + u8 outdata[ST_SENSORS_BYTE_FOR_CHANNEL]; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev, + ch_addr, ST_SENSORS_BYTE_FOR_CHANNEL, + outdata, sdata->multiread_bit); + if (err < 0) + goto read_error; + + *data = (s16)get_unaligned_le16(outdata); + +read_error: + return err; +} + +int st_sensors_read_info_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *ch, int *val) +{ + int err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + mutex_lock(&indio_dev->mlock); + if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { + err = -EBUSY; + goto read_error; + } else { + err = st_sensors_set_enable(indio_dev, true); + if (err < 0) + goto read_error; + + msleep((sdata->sensor->bootime * 1000) / sdata->odr); + err = st_sensors_read_axis_data(indio_dev, ch->address, val); + if (err < 0) + goto read_error; + + *val = *val >> ch->scan_type.shift; + } + mutex_unlock(&indio_dev->mlock); + + return err; + +read_error: + mutex_unlock(&indio_dev->mlock); + return err; +} +EXPORT_SYMBOL(st_sensors_read_info_raw); + +int st_sensors_check_device_support(struct iio_dev *indio_dev, + int num_sensors_list, const struct st_sensors *sensors) +{ + u8 wai; + int i, n, err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + err = sdata->tf->read_byte(&sdata->tb, sdata->dev, + ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai); + if (err < 0) { + dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n"); + goto read_wai_error; + } + + for (i = 0; i < num_sensors_list; i++) { + if (sensors[i].wai == wai) + break; + } + if (i == num_sensors_list) + goto device_not_supported; + + for (n = 0; n < ARRAY_SIZE(sensors[i].sensors_supported); n++) { + if (strcmp(indio_dev->name, + &sensors[i].sensors_supported[n][0]) == 0) + break; + } + if (n == ARRAY_SIZE(sensors[i].sensors_supported)) { + dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n"); + goto sensor_name_mismatch; + } + + sdata->sensor = (struct st_sensors *)&sensors[i]; + + return i; + +device_not_supported: + dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai); +sensor_name_mismatch: + err = -ENODEV; +read_wai_error: + return err; +} +EXPORT_SYMBOL(st_sensors_check_device_support); + +ssize_t st_sensors_sysfs_get_sampling_frequency(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct st_sensor_data *adata = iio_priv(dev_get_drvdata(dev)); + + return sprintf(buf, "%d\n", adata->odr); +} +EXPORT_SYMBOL(st_sensors_sysfs_get_sampling_frequency); + +ssize_t st_sensors_sysfs_set_sampling_frequency(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + int err; + unsigned int odr; + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + err = kstrtoint(buf, 10, &odr); + if (err < 0) + goto conversion_error; + + mutex_lock(&indio_dev->mlock); + err = st_sensors_set_odr(indio_dev, odr); + mutex_unlock(&indio_dev->mlock); + +conversion_error: + return err < 0 ? err : size; +} +EXPORT_SYMBOL(st_sensors_sysfs_set_sampling_frequency); + +ssize_t st_sensors_sysfs_sampling_frequency_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + return st_sensors_get_sampling_frequency_avl(indio_dev, buf); +} +EXPORT_SYMBOL(st_sensors_sysfs_sampling_frequency_avail); + +ssize_t st_sensors_sysfs_scale_avail(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + + return st_sensors_get_scale_avl(indio_dev, buf); +} +EXPORT_SYMBOL(st_sensors_sysfs_scale_avail); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors core"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c new file mode 100644 index 0000000..38af944 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c @@ -0,0 +1,81 @@ +/* + * STMicroelectronics sensors i2c library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> + +#include <linux/iio/common/st_sensors_i2c.h> + + +#define ST_SENSORS_I2C_MULTIREAD 0x80 + +static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + return to_i2c_client(sdata->dev)->irq; +} + +static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 *res_byte) +{ + int err; + + err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr); + if (err < 0) + goto st_accel_i2c_read_byte_error; + + *res_byte = err & 0xff; + +st_accel_i2c_read_byte_error: + return err < 0 ? err : 0; +} + +static int st_sensors_i2c_read_multiple_byte( + struct st_sensor_transfer_buffer *tb, struct device *dev, + u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + if (multiread_bit) + reg_addr |= ST_SENSORS_I2C_MULTIREAD; + + return i2c_smbus_read_i2c_block_data(to_i2c_client(dev), + reg_addr, len, data); +} + +static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 data) +{ + return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data); +} + +static const struct st_sensor_transfer_function st_sensors_tf_i2c = { + .read_byte = st_sensors_i2c_read_byte, + .write_byte = st_sensors_i2c_write_byte, + .read_multiple_byte = st_sensors_i2c_read_multiple_byte, +}; + +void st_sensors_i2c_configure(struct iio_dev *indio_dev, + struct i2c_client *client, struct st_sensor_data *sdata) +{ + i2c_set_clientdata(client, indio_dev); + + indio_dev->dev.parent = &client->dev; + indio_dev->name = client->name; + + sdata->tf = &st_sensors_tf_i2c; + sdata->get_irq_data_ready = st_sensors_i2c_get_irq; +} +EXPORT_SYMBOL(st_sensors_i2c_configure); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c new file mode 100644 index 0000000..f0aa2f1 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_spi.c @@ -0,0 +1,128 @@ +/* + * STMicroelectronics sensors spi library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> + +#include <linux/iio/common/st_sensors_spi.h> + + +#define ST_SENSORS_SPI_MULTIREAD 0xc0 +#define ST_SENSORS_SPI_READ 0x80 + +static unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + return to_spi_device(sdata->dev)->irq; +} + +static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + struct spi_message msg; + int err; + + struct spi_transfer xfers[] = { + { + .tx_buf = tb->tx_buf, + .bits_per_word = 8, + .len = 1, + }, + { + .rx_buf = tb->rx_buf, + .bits_per_word = 8, + .len = len, + } + }; + + mutex_lock(&tb->buf_lock); + if ((multiread_bit) && (len > 1)) + tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD; + else + tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ; + + spi_message_init(&msg); + spi_message_add_tail(&xfers[0], &msg); + spi_message_add_tail(&xfers[1], &msg); + err = spi_sync(to_spi_device(dev), &msg); + if (err) + goto acc_spi_read_error; + + memcpy(data, tb->rx_buf, len*sizeof(u8)); + mutex_unlock(&tb->buf_lock); + return len; + +acc_spi_read_error: + mutex_unlock(&tb->buf_lock); + return err; +} + +static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 *res_byte) +{ + return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false); +} + +static int st_sensors_spi_read_multiple_byte( + struct st_sensor_transfer_buffer *tb, struct device *dev, + u8 reg_addr, int len, u8 *data, bool multiread_bit) +{ + return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit); +} + +static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb, + struct device *dev, u8 reg_addr, u8 data) +{ + struct spi_message msg; + int err; + + struct spi_transfer xfers = { + .tx_buf = tb->tx_buf, + .bits_per_word = 8, + .len = 2, + }; + + mutex_lock(&tb->buf_lock); + tb->tx_buf[0] = reg_addr; + tb->tx_buf[1] = data; + + spi_message_init(&msg); + spi_message_add_tail(&xfers, &msg); + err = spi_sync(to_spi_device(dev), &msg); + mutex_unlock(&tb->buf_lock); + + return err; +} + +static const struct st_sensor_transfer_function st_sensors_tf_spi = { + .read_byte = st_sensors_spi_read_byte, + .write_byte = st_sensors_spi_write_byte, + .read_multiple_byte = st_sensors_spi_read_multiple_byte, +}; + +void st_sensors_spi_configure(struct iio_dev *indio_dev, + struct spi_device *spi, struct st_sensor_data *sdata) +{ + spi_set_drvdata(spi, indio_dev); + + indio_dev->dev.parent = &spi->dev; + indio_dev->name = spi->modalias; + + sdata->tf = &st_sensors_tf_spi; + sdata->get_irq_data_ready = st_sensors_spi_get_irq; +} +EXPORT_SYMBOL(st_sensors_spi_configure); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c new file mode 100644 index 0000000..139ed03 --- /dev/null +++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c @@ -0,0 +1,77 @@ +/* + * STMicroelectronics sensors trigger library driver + * + * Copyright 2012-2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/iio/iio.h> +#include <linux/iio/trigger.h> +#include <linux/interrupt.h> + +#include <linux/iio/common/st_sensors.h> + + +int st_sensors_allocate_trigger(struct iio_dev *indio_dev, + const struct iio_trigger_ops *trigger_ops) +{ + int err; + struct st_sensor_data *sdata = iio_priv(indio_dev); + + sdata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name); + if (sdata->trig == NULL) { + err = -ENOMEM; + dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n"); + goto iio_trigger_alloc_error; + } + + err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev), + iio_trigger_generic_data_rdy_poll, + NULL, + IRQF_TRIGGER_RISING, + sdata->trig->name, + sdata->trig); + if (err) + goto request_irq_error; + + sdata->trig->private_data = indio_dev; + sdata->trig->ops = trigger_ops; + sdata->trig->dev.parent = sdata->dev; + + err = iio_trigger_register(sdata->trig); + if (err < 0) { + dev_err(&indio_dev->dev, "failed to register iio trigger.\n"); + goto iio_trigger_register_error; + } + indio_dev->trig = sdata->trig; + + return 0; + +iio_trigger_register_error: + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); +request_irq_error: + iio_trigger_free(sdata->trig); +iio_trigger_alloc_error: + return err; +} +EXPORT_SYMBOL(st_sensors_allocate_trigger); + +void st_sensors_deallocate_trigger(struct iio_dev *indio_dev) +{ + struct st_sensor_data *sdata = iio_priv(indio_dev); + + iio_trigger_unregister(sdata->trig); + free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig); + iio_trigger_free(sdata->trig); +} +EXPORT_SYMBOL(st_sensors_deallocate_trigger); + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger"); +MODULE_LICENSE("GPL v2"); |