LXR linux/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
  24static int wm831x_i2c_probe(struct i2c_client *i2c,
  25                            const struct i2c_device_id *id)
  26{
  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 = (enum wm831x_parent)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
  66static 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
  73static 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
  82static 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
  93static const struct dev_pm_ops wm831x_pm_ops = {
  94        .suspend = wm831x_i2c_suspend,
  95        .poweroff = wm831x_i2c_poweroff,
  96};
  97
  98static 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
 109static 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}
 119subsys_initcall(wm831x_i2c_init);
 120