tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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>
30#include <linux/mfd/core.h>
31#include <linux/mfd/max77686.h>
32#include <linux/mfd/max77686-private.h>
33#include <linux/err.h>
34
35#define I2C_ADDR_RTC (0x0C >> 1)
36
37static struct mfd_cell max77686_devs[] = {
38 { .name = "max77686-pmic", },
39 { .name = "max77686-rtc", },
40};
41
42static struct regmap_config max77686_regmap_config = {
43 .reg_bits = 8,
44 .val_bits = 8,
45};
46
47#ifdef CONFIG_OF
48static struct of_device_id max77686_pmic_dt_match[] = {
49 {.compatible = "maxim,max77686", .data = 0},
50 {},
51};
52
53static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
54 *dev)
55{
56 struct max77686_platform_data *pd;
57
58 pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
59 if (!pd) {
60 dev_err(dev, "could not allocate memory for pdata\n");
61 return NULL;
62 }
63
64 dev->platform_data = pd;
65 return pd;
66}
67#else
68static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
69 *dev)
70{
71 return 0;
72}
73#endif
74
75static int max77686_i2c_probe(struct i2c_client *i2c,
76 const struct i2c_device_id *id)
77{
78 struct max77686_dev *max77686 = NULL;
79 struct max77686_platform_data *pdata = i2c->dev.platform_data;
80 unsigned int data;
81 int ret = 0;
82
83 if (i2c->dev.of_node)
84 pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
85
86 if (!pdata) {
87 ret = -EIO;
88 dev_err(&i2c->dev, "No platform data found.\n");
89 goto err;
90 }
91
92 max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
93 if (max77686 == NULL)
94 return -ENOMEM;
95
96 i2c_set_clientdata(i2c, max77686);
97 max77686->dev = &i2c->dev;
98 max77686->i2c = i2c;
99 max77686->type = id->driver_data;
100
101 max77686->wakeup = pdata->wakeup;
102 max77686->irq_gpio = pdata->irq_gpio;
103 max77686->irq = i2c->irq;
104
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",
109 ret);
110 kfree(max77686);
111 return ret;
112 }
113
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");
118 ret = -ENODEV;
119 goto err;
120 } 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,
129 ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
130
131 if (ret < 0)
132 goto err_mfd;
133
134 return ret;
135
136err_mfd:
137 mfd_remove_devices(max77686->dev);
138 i2c_unregister_device(max77686->rtc);
139err:
140 kfree(max77686);
141 return ret;
142}
143
144static int max77686_i2c_remove(struct i2c_client *i2c)
145{
146 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
147
148 mfd_remove_devices(max77686->dev);
149 i2c_unregister_device(max77686->rtc);
150 kfree(max77686);
151
152 return 0;
153}
154
155static const struct i2c_device_id max77686_i2c_id[] = {
156 { "max77686", TYPE_MAX77686 },
157 { }
158};
159MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
160
161static struct i2c_driver max77686_i2c_driver = {
162 .driver = {
163 .name = "max77686",
164 .owner = THIS_MODULE,
165 .of_match_table = of_match_ptr(max77686_pmic_dt_match),
166 },
167 .probe = max77686_i2c_probe,
168 .remove = max77686_i2c_remove,
169 .id_table = max77686_i2c_id,
170};
171
172static int __init max77686_i2c_init(void)
173{
174 return i2c_add_driver(&max77686_i2c_driver);
175}
176/* init early so consumer devices can complete system boot */
177subsys_initcall(max77686_i2c_init);
178
179static void __exit max77686_i2c_exit(void)
180{
181 i2c_del_driver(&max77686_i2c_driver);
182}
183module_exit(max77686_i2c_exit);
184
185MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
186MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
187MODULE_LICENSE("GPL");