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>
36 #define I2C_ADDR_RTC (0x0C >> 1)
38 static const struct mfd_cell max77686_devs[] = {
39 { .name = "max77686-pmic", },
40 { .name = "max77686-rtc", },
41 { .name = "max77686-clk", },
44 static struct regmap_config max77686_regmap_config = {
50 static struct of_device_id max77686_pmic_dt_match[] = {
51 {.compatible = "maxim,max77686", .data = NULL},
55 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
58 struct max77686_platform_data *pd;
60 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
62 dev_err(dev, "could not allocate memory for pdata\n");
66 dev->platform_data = pd;
70 static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
77 static int max77686_i2c_probe(struct i2c_client *i2c,
78 const struct i2c_device_id *id)
80 struct max77686_dev *max77686 = NULL;
81 struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
86 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
89 dev_err(&i2c->dev, "No platform data found.\n");
93 max77686 = devm_kzalloc(&i2c->dev,
94 sizeof(struct max77686_dev), GFP_KERNEL);
98 i2c_set_clientdata(i2c, max77686);
99 max77686->dev = &i2c->dev;
101 max77686->type = id->driver_data;
103 max77686->wakeup = pdata->wakeup;
104 max77686->irq_gpio = pdata->irq_gpio;
105 max77686->irq = i2c->irq;
107 max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
108 if (IS_ERR(max77686->regmap)) {
109 ret = PTR_ERR(max77686->regmap);
110 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
115 if (regmap_read(max77686->regmap,
116 MAX77686_REG_DEVICE_ID, &data) < 0) {
117 dev_err(max77686->dev,
118 "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 if (!max77686->rtc) {
125 dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
128 i2c_set_clientdata(max77686->rtc, max77686);
130 max77686_irq_init(max77686);
132 ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
133 ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
135 mfd_remove_devices(max77686->dev);
136 i2c_unregister_device(max77686->rtc);
142 static int max77686_i2c_remove(struct i2c_client *i2c)
144 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
146 mfd_remove_devices(max77686->dev);
147 i2c_unregister_device(max77686->rtc);
152 static const struct i2c_device_id max77686_i2c_id[] = {
153 { "max77686", TYPE_MAX77686 },
156 MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
158 static struct i2c_driver max77686_i2c_driver = {
161 .owner = THIS_MODULE,
162 .of_match_table = of_match_ptr(max77686_pmic_dt_match),
164 .probe = max77686_i2c_probe,
165 .remove = max77686_i2c_remove,
166 .id_table = max77686_i2c_id,
169 static int __init max77686_i2c_init(void)
171 return i2c_add_driver(&max77686_i2c_driver);
173 /* init early so consumer devices can complete system boot */
174 subsys_initcall(max77686_i2c_init);
176 static void __exit max77686_i2c_exit(void)
178 i2c_del_driver(&max77686_i2c_driver);
180 module_exit(max77686_i2c_exit);
182 MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
183 MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
184 MODULE_LICENSE("GPL");