drivers/mfd/axp20x-i2c.c

   1 /*
   2  * I2C driver for the X-Powers' Power Management ICs
   3  *
   4  * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
   5  * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
   6  * as well as configurable GPIOs.
   7  *
   8  * This driver supports the I2C variants.
   9  *
  10  * Copyright (C) 2014 Carlo Caione
  11  *
  12  * Author: Carlo Caione <carlo@caione.org>
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/acpi.h>
  20 #include <linux/err.h>
  21 #include <linux/i2c.h>
  22 #include <linux/module.h>
  23 #include <linux/mfd/axp20x.h>
  24 #include <linux/of.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27
  28 static int axp20x_i2c_probe(struct i2c_client *i2c,
  29                             const struct i2c_device_id *id)
  30 {
  31         struct axp20x_dev *axp20x;
  32         int ret;
  33
  34         axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
  35         if (!axp20x)
  36                 return -ENOMEM;
  37
  38         axp20x->dev = &i2c->dev;
  39         axp20x->irq = i2c->irq;
  40         dev_set_drvdata(axp20x->dev, axp20x);
  41
  42         ret = axp20x_match_device(axp20x);
  43         if (ret)
  44                 return ret;
  45
  46         axp20x->regmap = devm_regmap_init_i2c(i2c, axp20x->regmap_cfg);
  47         if (IS_ERR(axp20x->regmap)) {
  48                 ret = PTR_ERR(axp20x->regmap);
  49                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
  50                 return ret;
  51         }
  52
  53         return axp20x_device_probe(axp20x);
  54 }
  55
  56 static int axp20x_i2c_remove(struct i2c_client *i2c)
  57 {
  58         struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);
  59
  60         return axp20x_device_remove(axp20x);
  61 }
  62
  63 static const struct of_device_id axp20x_i2c_of_match[] = {
  64         { .compatible = "x-powers,axp152", .data = (void *)AXP152_ID },
  65         { .compatible = "x-powers,axp202", .data = (void *)AXP202_ID },
  66         { .compatible = "x-powers,axp209", .data = (void *)AXP209_ID },
  67         { .compatible = "x-powers,axp221", .data = (void *)AXP221_ID },
  68         { },
  69 };
  70 MODULE_DEVICE_TABLE(of, axp20x_i2c_of_match);
  71
  72 /*
  73  * This is useless for OF-enabled devices, but it is needed by I2C subsystem
  74  */
  75 static const struct i2c_device_id axp20x_i2c_id[] = {
  76         { },
  77 };
  78 MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
  79
  80 static const struct acpi_device_id axp20x_i2c_acpi_match[] = {
  81         {
  82                 .id = "INT33F4",
  83                 .driver_data = AXP288_ID,
  84         },
  85         { },
  86 };
  87 MODULE_DEVICE_TABLE(acpi, axp20x_i2c_acpi_match);
  88
  89 static struct i2c_driver axp20x_i2c_driver = {
  90         .driver = {
  91                 .name   = "axp20x-i2c",
  92                 .of_match_table = of_match_ptr(axp20x_i2c_of_match),
  93                 .acpi_match_table = ACPI_PTR(axp20x_i2c_acpi_match),
  94         },
  95         .probe          = axp20x_i2c_probe,
  96         .remove         = axp20x_i2c_remove,
  97         .id_table       = axp20x_i2c_id,
  98 };
  99
 100 module_i2c_driver(axp20x_i2c_driver);
 101
 102 MODULE_DESCRIPTION("PMIC MFD I2C driver for AXP20X");
 103 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 104 MODULE_LICENSE("GPL");