2 * max77686.c - mfd core driver for the Maxim 77686
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@smasung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This driver is based on max8997.c
25 #include <linux/export.h>
26 #include <linux/slab.h>
27 #include <linux/i2c.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/module.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/max77686.h>
32 #include <linux/mfd/max77686-private.h>
33 #include <linux/err.h>
35 #define I2C_ADDR_RTC (0x0C >> 1)
37 static struct mfd_cell max77686_devs[] = {
38 { .name = "max77686-pmic", },
39 { .name = "max77686-rtc", },
42 static struct regmap_config max77686_regmap_config = {
48 static struct of_device_id max77686_pmic_dt_match[] = {
49 {.compatible = "maxim,max77686", .data = NULL},
53 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
56 struct max77686_platform_data *pd;
58 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
60 dev_err(dev, "could not allocate memory for pdata\n");
64 dev->platform_data = pd;
68 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
75 static int max77686_i2c_probe(struct i2c_client *i2c,
76 const struct i2c_device_id *id)
78 struct max77686_dev *max77686 = NULL;
79 struct max77686_platform_data *pdata = i2c->dev.platform_data;
84 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
88 dev_err(&i2c->dev, "No platform data found.\n");
92 max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
96 i2c_set_clientdata(i2c, max77686);
97 max77686->dev = &i2c->dev;
99 max77686->type = id->driver_data;
101 max77686->wakeup = pdata->wakeup;
102 max77686->irq_gpio = pdata->irq_gpio;
103 max77686->irq = i2c->irq;
105 max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
106 if (IS_ERR(max77686->regmap)) {
107 ret = PTR_ERR(max77686->regmap);
108 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
114 if (regmap_read(max77686->regmap,
115 MAX77686_REG_DEVICE_ID, &data) < 0) {
116 dev_err(max77686->dev,
117 "device not found on this channel (this is not an error)\n");
121 dev_info(max77686->dev, "device found\n");
123 max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
124 i2c_set_clientdata(max77686->rtc, max77686);
126 max77686_irq_init(max77686);
128 ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
129 ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
137 mfd_remove_devices(max77686->dev);
138 i2c_unregister_device(max77686->rtc);
144 static int max77686_i2c_remove(struct i2c_client *i2c)
146 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
148 mfd_remove_devices(max77686->dev);
149 i2c_unregister_device(max77686->rtc);
155 static const struct i2c_device_id max77686_i2c_id[] = {
156 { "max77686", TYPE_MAX77686 },
159 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
161 static struct i2c_driver max77686_i2c_driver = {
164 .owner = THIS_MODULE,
165 .of_match_table = of_match_ptr(max77686_pmic_dt_match),
167 .probe = max77686_i2c_probe,
168 .remove = max77686_i2c_remove,
169 .id_table = max77686_i2c_id,
172 static int __init max77686_i2c_init(void)
174 return i2c_add_driver(&max77686_i2c_driver);
176 /* init early so consumer devices can complete system boot */
177 subsys_initcall(max77686_i2c_init);
179 static void __exit max77686_i2c_exit(void)
181 i2c_del_driver(&max77686_i2c_driver);
183 module_exit(max77686_i2c_exit);
185 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
186 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
187 MODULE_LICENSE("GPL");