LXR linux/drivers/iio/common/st_sensors/st_sensors

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * STMicroelectronics sensors i2c library driver
   4 *
   5 * Copyright 2012-2013 STMicroelectronics Inc.
   6 *
   7 * Denis Ciocca <denis.ciocca@st.com>
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/module.h>
  12#include <linux/slab.h>
  13#include <linux/iio/iio.h>
  14#include <linux/of_device.h>
  15#include <linux/acpi.h>
  16
  17#include <linux/iio/common/st_sensors_i2c.h>
  18
  19
  20#define ST_SENSORS_I2C_MULTIREAD        0x80
  21
  22static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
  23{
  24        struct st_sensor_data *sdata = iio_priv(indio_dev);
  25
  26        return to_i2c_client(sdata->dev)->irq;
  27}
  28
  29static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
  30                                struct device *dev, u8 reg_addr, u8 *res_byte)
  31{
  32        int err;
  33
  34        err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr);
  35        if (err < 0)
  36                goto st_accel_i2c_read_byte_error;
  37
  38        *res_byte = err & 0xff;
  39
  40st_accel_i2c_read_byte_error:
  41        return err < 0 ? err : 0;
  42}
  43
  44static int st_sensors_i2c_read_multiple_byte(
  45                struct st_sensor_transfer_buffer *tb, struct device *dev,
  46                        u8 reg_addr, int len, u8 *data, bool multiread_bit)
  47{
  48        if (multiread_bit)
  49                reg_addr |= ST_SENSORS_I2C_MULTIREAD;
  50
  51        return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev),
  52                                                         reg_addr, len, data);
  53}
  54
  55static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
  56                                struct device *dev, u8 reg_addr, u8 data)
  57{
  58        return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
  59}
  60
  61static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
  62        .read_byte = st_sensors_i2c_read_byte,
  63        .write_byte = st_sensors_i2c_write_byte,
  64        .read_multiple_byte = st_sensors_i2c_read_multiple_byte,
  65};
  66
  67void st_sensors_i2c_configure(struct iio_dev *indio_dev,
  68                struct i2c_client *client, struct st_sensor_data *sdata)
  69{
  70        i2c_set_clientdata(client, indio_dev);
  71
  72        indio_dev->dev.parent = &client->dev;
  73        indio_dev->name = client->name;
  74
  75        sdata->dev = &client->dev;
  76        sdata->tf = &st_sensors_tf_i2c;
  77        sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
  78}
  79EXPORT_SYMBOL(st_sensors_i2c_configure);
  80
  81#ifdef CONFIG_ACPI
  82int st_sensors_match_acpi_device(struct device *dev)
  83{
  84        const struct acpi_device_id *acpi_id;
  85        kernel_ulong_t driver_data = 0;
  86
  87        if (ACPI_HANDLE(dev)) {
  88                acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
  89                if (!acpi_id) {
  90                        dev_err(dev, "No driver data\n");
  91                        return -EINVAL;
  92                }
  93                driver_data = acpi_id->driver_data;
  94        }
  95        return driver_data;
  96}
  97EXPORT_SYMBOL(st_sensors_match_acpi_device);
  98#endif
  99
 100MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 101MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
 102MODULE_LICENSE("GPL v2");
 103