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dae8a969 JL |
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> | |
dae8a969 JL |
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 | ||
c1516f84 YSB |
37 | static struct of_device_id __devinitdata max77686_pmic_dt_match[] = { |
38 | {.compatible = "maxim,max77686", .data = 0}, | |
39 | {}, | |
40 | }; | |
41 | ||
dae8a969 JL |
42 | static struct mfd_cell max77686_devs[] = { |
43 | { .name = "max77686-pmic", }, | |
44 | { .name = "max77686-rtc", }, | |
45 | }; | |
46 | ||
47 | static struct regmap_config max77686_regmap_config = { | |
48 | .reg_bits = 8, | |
49 | .val_bits = 8, | |
50 | }; | |
51 | ||
c1516f84 YSB |
52 | #ifdef CONFIG_OF |
53 | static 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 | |
68 | static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device | |
69 | *dev) | |
70 | { | |
71 | return 0; | |
72 | } | |
73 | #endif | |
74 | ||
dae8a969 JL |
75 | static int max77686_i2c_probe(struct i2c_client *i2c, |
76 | const struct i2c_device_id *id) | |
77 | { | |
c1516f84 | 78 | struct max77686_dev *max77686 = NULL; |
dae8a969 JL |
79 | struct max77686_platform_data *pdata = i2c->dev.platform_data; |
80 | unsigned int data; | |
81 | int ret = 0; | |
82 | ||
c1516f84 YSB |
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 | ||
dae8a969 JL |
92 | max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); |
93 | if (max77686 == NULL) | |
94 | return -ENOMEM; | |
95 | ||
96 | max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); | |
97 | if (IS_ERR(max77686->regmap)) { | |
98 | ret = PTR_ERR(max77686->regmap); | |
99 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
100 | ret); | |
101 | kfree(max77686); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | i2c_set_clientdata(i2c, max77686); | |
106 | max77686->dev = &i2c->dev; | |
107 | max77686->i2c = i2c; | |
108 | max77686->type = id->driver_data; | |
109 | ||
dae8a969 JL |
110 | max77686->wakeup = pdata->wakeup; |
111 | max77686->irq_gpio = pdata->irq_gpio; | |
2b40459b | 112 | max77686->irq = i2c->irq; |
dae8a969 | 113 | |
dae8a969 JL |
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); | |
130 | ||
131 | if (ret < 0) | |
132 | goto err_mfd; | |
133 | ||
134 | return ret; | |
135 | ||
136 | err_mfd: | |
137 | mfd_remove_devices(max77686->dev); | |
138 | i2c_unregister_device(max77686->rtc); | |
139 | err: | |
140 | kfree(max77686); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | static 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 | ||
155 | static const struct i2c_device_id max77686_i2c_id[] = { | |
156 | { "max77686", TYPE_MAX77686 }, | |
157 | { } | |
158 | }; | |
159 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
160 | ||
161 | static struct i2c_driver max77686_i2c_driver = { | |
162 | .driver = { | |
163 | .name = "max77686", | |
164 | .owner = THIS_MODULE, | |
c1516f84 | 165 | .of_match_table = of_match_ptr(max77686_pmic_dt_match), |
dae8a969 JL |
166 | }, |
167 | .probe = max77686_i2c_probe, | |
168 | .remove = max77686_i2c_remove, | |
169 | .id_table = max77686_i2c_id, | |
170 | }; | |
171 | ||
172 | static 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 */ | |
177 | subsys_initcall(max77686_i2c_init); | |
178 | ||
179 | static void __exit max77686_i2c_exit(void) | |
180 | { | |
181 | i2c_del_driver(&max77686_i2c_driver); | |
182 | } | |
183 | module_exit(max77686_i2c_exit); | |
184 | ||
185 | MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); | |
186 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); | |
187 | MODULE_LICENSE("GPL"); |