drivers/mfd/wm831x-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm831x-i2c.c  --  I2C access for Wolfson WM831x PMICs
   4  *
   5  * Copyright 2009,2010 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/i2c.h>
  13 #include <linux/delay.h>
  14 #include <linux/mfd/core.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/of.h>
  18 #include <linux/regmap.h>
  19
  20 #include <linux/mfd/wm831x/core.h>
  21 #include <linux/mfd/wm831x/pdata.h>
  22
  23 static int wm831x_i2c_probe(struct i2c_client *i2c)
  24 {
  25         struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
  26         struct wm831x *wm831x;
  27         enum wm831x_parent type;
  28         int ret;
  29
  30         type = (uintptr_t)i2c_get_match_data(i2c);
  31         if (!type) {
  32                 dev_err(&i2c->dev, "Failed to match device\n");
  33                 return -ENODEV;
  34         }
  35
  36         wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
  37         if (wm831x == NULL)
  38                 return -ENOMEM;
  39
  40         i2c_set_clientdata(i2c, wm831x);
  41         wm831x->dev = &i2c->dev;
  42         wm831x->type = type;
  43
  44         wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
  45         if (IS_ERR(wm831x->regmap)) {
  46                 ret = PTR_ERR(wm831x->regmap);
  47                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  48                         ret);
  49                 return ret;
  50         }
  51
  52         if (pdata)
  53                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  54
  55         return wm831x_device_init(wm831x, i2c->irq);
  56 }
  57
  58 static int wm831x_i2c_suspend(struct device *dev)
  59 {
  60         struct wm831x *wm831x = dev_get_drvdata(dev);
  61
  62         return wm831x_device_suspend(wm831x);
  63 }
  64
  65 static int wm831x_i2c_poweroff(struct device *dev)
  66 {
  67         struct wm831x *wm831x = dev_get_drvdata(dev);
  68
  69         wm831x_device_shutdown(wm831x);
  70
  71         return 0;
  72 }
  73
  74 static const struct i2c_device_id wm831x_i2c_id[] = {
  75         { "wm8310", WM8310 },
  76         { "wm8311", WM8311 },
  77         { "wm8312", WM8312 },
  78         { "wm8320", WM8320 },
  79         { "wm8321", WM8321 },
  80         { "wm8325", WM8325 },
  81         { "wm8326", WM8326 },
  82         { }
  83 };
  84
  85 static const struct dev_pm_ops wm831x_pm_ops = {
  86         .suspend = wm831x_i2c_suspend,
  87         .poweroff = wm831x_i2c_poweroff,
  88 };
  89
  90 static struct i2c_driver wm831x_i2c_driver = {
  91         .driver = {
  92                 .name = "wm831x",
  93                 .pm = &wm831x_pm_ops,
  94                 .of_match_table = of_match_ptr(wm831x_of_match),
  95                 .suppress_bind_attrs = true,
  96         },
  97         .probe = wm831x_i2c_probe,
  98         .id_table = wm831x_i2c_id,
  99 };
 100
 101 static int __init wm831x_i2c_init(void)
 102 {
 103         int ret;
 104
 105         ret = i2c_add_driver(&wm831x_i2c_driver);
 106         if (ret != 0)
 107                 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
 108
 109         return ret;
 110 }
 111 subsys_initcall(wm831x_i2c_init);