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Jonghwa Leedae8a962012-06-25 10:34:36 +02001/*
2 * max77686.c - mfd core driver for the Maxim 77686
3 *
4 * Copyright (C) 2012 Samsung Electronics
5 * Chiwoong Byun <woong.byun@smasung.com>
6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
7 *
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.
12 *
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.
17 *
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
21 *
22 * This driver is based on max8997.c
23 */
24
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>
Jonghwa Leedae8a962012-06-25 10:34:36 +020030#include <linux/mfd/core.h>
31#include <linux/mfd/max77686.h>
32#include <linux/mfd/max77686-private.h>
33#include <linux/err.h>
Sachin Kamat2a048d32013-10-16 14:26:49 +053034#include <linux/of.h>
Jonghwa Leedae8a962012-06-25 10:34:36 +020035
36#define I2C_ADDR_RTC (0x0C >> 1)
37
Geert Uytterhoeven7c0517b2013-11-18 14:33:00 +010038static const struct mfd_cell max77686_devs[] = {
Jonghwa Leedae8a962012-06-25 10:34:36 +020039 { .name = "max77686-pmic", },
40 { .name = "max77686-rtc", },
Olof Johanssonc0fa7e12013-05-10 10:11:59 -070041 { .name = "max77686-clk", },
Jonghwa Leedae8a962012-06-25 10:34:36 +020042};
43
44static struct regmap_config max77686_regmap_config = {
45 .reg_bits = 8,
46 .val_bits = 8,
47};
48
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053049#ifdef CONFIG_OF
Bill Pembertona9e9ce42012-11-19 13:24:21 -050050static struct of_device_id max77686_pmic_dt_match[] = {
Sachin Kamatd1ac2c02013-03-26 10:13:36 +053051 {.compatible = "maxim,max77686", .data = NULL},
Axel Lin2984fc02012-07-09 22:29:00 +080052 {},
53};
54
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053055static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
56 *dev)
57{
58 struct max77686_platform_data *pd;
59
60 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
61 if (!pd) {
62 dev_err(dev, "could not allocate memory for pdata\n");
63 return NULL;
64 }
65
66 dev->platform_data = pd;
67 return pd;
68}
69#else
70static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
71 *dev)
72{
73 return 0;
74}
75#endif
76
Jonghwa Leedae8a962012-06-25 10:34:36 +020077static int max77686_i2c_probe(struct i2c_client *i2c,
78 const struct i2c_device_id *id)
79{
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053080 struct max77686_dev *max77686 = NULL;
Jingoo Han334a41c2013-07-30 17:10:05 +090081 struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
Jonghwa Leedae8a962012-06-25 10:34:36 +020082 unsigned int data;
83 int ret = 0;
84
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053085 if (i2c->dev.of_node)
86 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
87
88 if (!pdata) {
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053089 dev_err(&i2c->dev, "No platform data found.\n");
Lee Jones742413a2013-05-23 16:25:16 +010090 return -EIO;
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +053091 }
92
Lee Jones742413a2013-05-23 16:25:16 +010093 max77686 = devm_kzalloc(&i2c->dev,
94 sizeof(struct max77686_dev), GFP_KERNEL);
Jonghwa Leedae8a962012-06-25 10:34:36 +020095 if (max77686 == NULL)
96 return -ENOMEM;
97
Jonghwa Leedae8a962012-06-25 10:34:36 +020098 i2c_set_clientdata(i2c, max77686);
99 max77686->dev = &i2c->dev;
100 max77686->i2c = i2c;
101 max77686->type = id->driver_data;
102
Jonghwa Leedae8a962012-06-25 10:34:36 +0200103 max77686->wakeup = pdata->wakeup;
104 max77686->irq_gpio = pdata->irq_gpio;
Yadwinder Singh Brar2b404592012-07-09 13:21:45 +0200105 max77686->irq = i2c->irq;
Jonghwa Leedae8a962012-06-25 10:34:36 +0200106
Krzysztof Kozlowski74142ff2013-12-20 10:35:07 +0100107 max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
Axel Lin136d9822012-12-25 00:16:43 +0800108 if (IS_ERR(max77686->regmap)) {
109 ret = PTR_ERR(max77686->regmap);
110 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
111 ret);
Axel Lin136d9822012-12-25 00:16:43 +0800112 return ret;
113 }
114
Jonghwa Leedae8a962012-06-25 10:34:36 +0200115 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");
Lee Jones742413a2013-05-23 16:25:16 +0100119 return -ENODEV;
Jonghwa Leedae8a962012-06-25 10:34:36 +0200120 } else
121 dev_info(max77686->dev, "device found\n");
122
123 max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
124 i2c_set_clientdata(max77686->rtc, max77686);
125
126 max77686_irq_init(max77686);
127
128 ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
Mark Brown0848c942012-09-11 15:16:36 +0800129 ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
Lee Jones742413a2013-05-23 16:25:16 +0100130 if (ret < 0) {
131 mfd_remove_devices(max77686->dev);
132 i2c_unregister_device(max77686->rtc);
133 }
Jonghwa Leedae8a962012-06-25 10:34:36 +0200134
Jonghwa Leedae8a962012-06-25 10:34:36 +0200135 return ret;
136}
137
138static int max77686_i2c_remove(struct i2c_client *i2c)
139{
140 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
141
142 mfd_remove_devices(max77686->dev);
143 i2c_unregister_device(max77686->rtc);
Jonghwa Leedae8a962012-06-25 10:34:36 +0200144
145 return 0;
146}
147
148static const struct i2c_device_id max77686_i2c_id[] = {
149 { "max77686", TYPE_MAX77686 },
150 { }
151};
152MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
153
154static struct i2c_driver max77686_i2c_driver = {
155 .driver = {
156 .name = "max77686",
157 .owner = THIS_MODULE,
Yadwinder Singh Brarc1516f82012-07-06 17:02:55 +0530158 .of_match_table = of_match_ptr(max77686_pmic_dt_match),
Jonghwa Leedae8a962012-06-25 10:34:36 +0200159 },
160 .probe = max77686_i2c_probe,
161 .remove = max77686_i2c_remove,
162 .id_table = max77686_i2c_id,
163};
164
165static int __init max77686_i2c_init(void)
166{
167 return i2c_add_driver(&max77686_i2c_driver);
168}
169/* init early so consumer devices can complete system boot */
170subsys_initcall(max77686_i2c_init);
171
172static void __exit max77686_i2c_exit(void)
173{
174 i2c_del_driver(&max77686_i2c_driver);
175}
176module_exit(max77686_i2c_exit);
177
178MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
179MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
180MODULE_LICENSE("GPL");