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/of_device.h>
  19 #include <linux/regmap.h>
  20
  21 #include <linux/mfd/wm831x/core.h>
  22 #include <linux/mfd/wm831x/pdata.h>
  23
  24 static int wm831x_i2c_probe(struct i2c_client *i2c)
  25 {
  26         const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
  27         struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
  28         const struct of_device_id *of_id;
  29         struct wm831x *wm831x;
  30         enum wm831x_parent type;
  31         int ret;
  32
  33         if (i2c->dev.of_node) {
  34                 of_id = of_match_device(wm831x_of_match, &i2c->dev);
  35                 if (!of_id) {
  36                         dev_err(&i2c->dev, "Failed to match device\n");
  37                         return -ENODEV;
  38                 }
  39                 type = (uintptr_t)of_id->data;
  40         } else {
  41                 type = (enum wm831x_parent)id->driver_data;
  42         }
  43
  44         wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
  45         if (wm831x == NULL)
  46                 return -ENOMEM;
  47
  48         i2c_set_clientdata(i2c, wm831x);
  49         wm831x->dev = &i2c->dev;
  50         wm831x->type = type;
  51
  52         wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
  53         if (IS_ERR(wm831x->regmap)) {
  54                 ret = PTR_ERR(wm831x->regmap);
  55                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  56                         ret);
  57                 return ret;
  58         }
  59
  60         if (pdata)
  61                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  62
  63         return wm831x_device_init(wm831x, i2c->irq);
  64 }
  65
  66 static int wm831x_i2c_suspend(struct device *dev)
  67 {
  68         struct wm831x *wm831x = dev_get_drvdata(dev);
  69
  70         return wm831x_device_suspend(wm831x);
  71 }
  72
  73 static int wm831x_i2c_poweroff(struct device *dev)
  74 {
  75         struct wm831x *wm831x = dev_get_drvdata(dev);
  76
  77         wm831x_device_shutdown(wm831x);
  78
  79         return 0;
  80 }
  81
  82 static const struct i2c_device_id wm831x_i2c_id[] = {
  83         { "wm8310", WM8310 },
  84         { "wm8311", WM8311 },
  85         { "wm8312", WM8312 },
  86         { "wm8320", WM8320 },
  87         { "wm8321", WM8321 },
  88         { "wm8325", WM8325 },
  89         { "wm8326", WM8326 },
  90         { }
  91 };
  92
  93 static const struct dev_pm_ops wm831x_pm_ops = {
  94         .suspend = wm831x_i2c_suspend,
  95         .poweroff = wm831x_i2c_poweroff,
  96 };
  97
  98 static struct i2c_driver wm831x_i2c_driver = {
  99         .driver = {
 100                 .name = "wm831x",
 101                 .pm = &wm831x_pm_ops,
 102                 .of_match_table = of_match_ptr(wm831x_of_match),
 103                 .suppress_bind_attrs = true,
 104         },
 105         .probe = wm831x_i2c_probe,
 106         .id_table = wm831x_i2c_id,
 107 };
 108
 109 static int __init wm831x_i2c_init(void)
 110 {
 111         int ret;
 112
 113         ret = i2c_add_driver(&wm831x_i2c_driver);
 114         if (ret != 0)
 115                 pr_err("Failed to register wm831x I2C driver: %d\n", ret);
 116
 117         return ret;
 118 }
 119 subsys_initcall(wm831x_i2c_init);