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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * wm831x-i2c.c -- I2C access for Wolfson WM831x PMICs4 *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 23static 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 58static 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 65static 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 74static 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 85static const struct dev_pm_ops wm831x_pm_ops = {86 .suspend = wm831x_i2c_suspend,87 .poweroff = wm831x_i2c_poweroff,88};89 90static 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 101static 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}111subsys_initcall(wm831x_i2c_init);112