drivers/iio/pressure/st_pressure_i2c.c

   1 /*
   2  * STMicroelectronics pressures driver
   3  *
   4  * Copyright 2013 STMicroelectronics Inc.
   5  *
   6  * Denis Ciocca <denis.ciocca@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/acpi.h>
  15 #include <linux/i2c.h>
  16 #include <linux/iio/iio.h>
  17
  18 #include <linux/iio/common/st_sensors.h>
  19 #include <linux/iio/common/st_sensors_i2c.h>
  20 #include "st_pressure.h"
  21
  22 #ifdef CONFIG_OF
  23 static const struct of_device_id st_press_of_match[] = {
  24         {
  25                 .compatible = "st,lps001wp-press",
  26                 .data = LPS001WP_PRESS_DEV_NAME,
  27         },
  28         {
  29                 .compatible = "st,lps25h-press",
  30                 .data = LPS25H_PRESS_DEV_NAME,
  31         },
  32         {
  33                 .compatible = "st,lps331ap-press",
  34                 .data = LPS331AP_PRESS_DEV_NAME,
  35         },
  36         {
  37                 .compatible = "st,lps22hb-press",
  38                 .data = LPS22HB_PRESS_DEV_NAME,
  39         },
  40         {},
  41 };
  42 MODULE_DEVICE_TABLE(of, st_press_of_match);
  43 #else
  44 #define st_press_of_match NULL
  45 #endif
  46
  47 #ifdef CONFIG_ACPI
  48 static const struct acpi_device_id st_press_acpi_match[] = {
  49         {"SNO9210", LPS22HB},
  50         { },
  51 };
  52 MODULE_DEVICE_TABLE(acpi, st_press_acpi_match);
  53 #else
  54 #define st_press_acpi_match NULL
  55 #endif
  56
  57 static const struct i2c_device_id st_press_id_table[] = {
  58         { LPS001WP_PRESS_DEV_NAME, LPS001WP },
  59         { LPS25H_PRESS_DEV_NAME,  LPS25H },
  60         { LPS331AP_PRESS_DEV_NAME, LPS331AP },
  61         { LPS22HB_PRESS_DEV_NAME, LPS22HB },
  62         {},
  63 };
  64 MODULE_DEVICE_TABLE(i2c, st_press_id_table);
  65
  66 static int st_press_i2c_probe(struct i2c_client *client,
  67                                                 const struct i2c_device_id *id)
  68 {
  69         struct iio_dev *indio_dev;
  70         struct st_sensor_data *press_data;
  71         int ret;
  72
  73         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*press_data));
  74         if (!indio_dev)
  75                 return -ENOMEM;
  76
  77         press_data = iio_priv(indio_dev);
  78
  79         if (client->dev.of_node) {
  80                 st_sensors_of_name_probe(&client->dev, st_press_of_match,
  81                                          client->name, sizeof(client->name));
  82         } else if (ACPI_HANDLE(&client->dev)) {
  83                 ret = st_sensors_match_acpi_device(&client->dev);
  84                 if ((ret < 0) || (ret >= ST_PRESS_MAX))
  85                         return -ENODEV;
  86
  87                 strncpy(client->name, st_press_id_table[ret].name,
  88                                 sizeof(client->name));
  89                 client->name[sizeof(client->name) - 1] = '\0';
  90         } else if (!id)
  91                 return -ENODEV;
  92
  93         st_sensors_i2c_configure(indio_dev, client, press_data);
  94
  95         ret = st_press_common_probe(indio_dev);
  96         if (ret < 0)
  97                 return ret;
  98
  99         return 0;
 100 }
 101
 102 static int st_press_i2c_remove(struct i2c_client *client)
 103 {
 104         st_press_common_remove(i2c_get_clientdata(client));
 105
 106         return 0;
 107 }
 108
 109 static struct i2c_driver st_press_driver = {
 110         .driver = {
 111                 .name = "st-press-i2c",
 112                 .of_match_table = of_match_ptr(st_press_of_match),
 113                 .acpi_match_table = ACPI_PTR(st_press_acpi_match),
 114         },
 115         .probe = st_press_i2c_probe,
 116         .remove = st_press_i2c_remove,
 117         .id_table = st_press_id_table,
 118 };
 119 module_i2c_driver(st_press_driver);
 120
 121 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
 122 MODULE_DESCRIPTION("STMicroelectronics pressures i2c driver");
 123 MODULE_LICENSE("GPL v2");