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1 | /* |
2 | * I2C driver for Maxim MAX8925 |
3 | * |
4 | * Copyright (C) 2009 Marvell International Ltd. |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License version 2 as |
9 | * published by the Free Software Foundation. |
10 | */ |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> |
13 | #include <linux/platform_device.h> |
14 | #include <linux/i2c.h> |
15 | #include <linux/mfd/max8925.h> |
16 | #include <linux/slab.h> |
17 | |
18 | #define RTC_I2C_ADDR 0x68 |
19 | #define ADC_I2C_ADDR 0x47 |
20 | |
21 | static inline int max8925_read_device(struct i2c_client *i2c, |
22 | int reg, int bytes, void *dest) |
23 | { |
24 | int ret; |
25 | |
26 | if (bytes > 1) |
27 | ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest); |
28 | else { |
29 | ret = i2c_smbus_read_byte_data(i2c, reg); |
30 | if (ret < 0) |
31 | return ret; |
32 | *(unsigned char *)dest = (unsigned char)ret; |
33 | } |
34 | return ret; |
35 | } |
36 | |
37 | static inline int max8925_write_device(struct i2c_client *i2c, |
38 | int reg, int bytes, void *src) |
39 | { |
40 | unsigned char buf[bytes + 1]; |
41 | int ret; |
42 | |
43 | buf[0] = (unsigned char)reg; |
44 | memcpy(&buf[1], src, bytes); |
45 | |
46 | ret = i2c_master_send(i2c, buf, bytes + 1); |
47 | if (ret < 0) |
48 | return ret; |
49 | return 0; |
50 | } |
51 | |
52 | int max8925_reg_read(struct i2c_client *i2c, int reg) |
53 | { |
54 | struct max8925_chip *chip = i2c_get_clientdata(i2c); |
55 | unsigned char data = 0; |
56 | int ret; |
57 | |
58 | mutex_lock(&chip->io_lock); |
59 | ret = max8925_read_device(i2c, reg, 1, &data); |
60 | mutex_unlock(&chip->io_lock); |
61 | |
62 | if (ret < 0) |
63 | return ret; |
64 | else |
65 | return (int)data; |
66 | } |
67 | EXPORT_SYMBOL(max8925_reg_read); |
68 | |
69 | int max8925_reg_write(struct i2c_client *i2c, int reg, |
70 | unsigned char data) |
71 | { |
72 | struct max8925_chip *chip = i2c_get_clientdata(i2c); |
73 | int ret; |
74 | |
75 | mutex_lock(&chip->io_lock); |
76 | ret = max8925_write_device(i2c, reg, 1, &data); |
77 | mutex_unlock(&chip->io_lock); |
78 | |
79 | return ret; |
80 | } |
81 | EXPORT_SYMBOL(max8925_reg_write); |
82 | |
83 | int max8925_bulk_read(struct i2c_client *i2c, int reg, |
84 | int count, unsigned char *buf) |
85 | { |
86 | struct max8925_chip *chip = i2c_get_clientdata(i2c); |
87 | int ret; |
88 | |
89 | mutex_lock(&chip->io_lock); |
90 | ret = max8925_read_device(i2c, reg, count, buf); |
91 | mutex_unlock(&chip->io_lock); |
92 | |
93 | return ret; |
94 | } |
95 | EXPORT_SYMBOL(max8925_bulk_read); |
96 | |
97 | int max8925_bulk_write(struct i2c_client *i2c, int reg, |
98 | int count, unsigned char *buf) |
99 | { |
100 | struct max8925_chip *chip = i2c_get_clientdata(i2c); |
101 | int ret; |
102 | |
103 | mutex_lock(&chip->io_lock); |
104 | ret = max8925_write_device(i2c, reg, count, buf); |
105 | mutex_unlock(&chip->io_lock); |
106 | |
107 | return ret; |
108 | } |
109 | EXPORT_SYMBOL(max8925_bulk_write); |
110 | |
111 | int max8925_set_bits(struct i2c_client *i2c, int reg, |
112 | unsigned char mask, unsigned char data) |
113 | { |
114 | struct max8925_chip *chip = i2c_get_clientdata(i2c); |
115 | unsigned char value; |
116 | int ret; |
117 | |
118 | mutex_lock(&chip->io_lock); |
119 | ret = max8925_read_device(i2c, reg, 1, &value); |
120 | if (ret < 0) |
121 | goto out; |
122 | value &= ~mask; |
123 | value |= data; |
124 | ret = max8925_write_device(i2c, reg, 1, &value); |
125 | out: |
126 | mutex_unlock(&chip->io_lock); |
127 | return ret; |
128 | } |
129 | EXPORT_SYMBOL(max8925_set_bits); |
130 | |
131 | |
132 | static const struct i2c_device_id max8925_id_table[] = { |
133 | { "max8925", 0 }, |
134 | { }, |
135 | }; |
136 | MODULE_DEVICE_TABLE(i2c, max8925_id_table); |
137 | |
138 | static int max8925_dt_init(struct device_node *np, struct device *dev, |
139 | struct max8925_platform_data *pdata) |
140 | { |
141 | int ret; |
142 | |
143 | ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq); |
144 | if (ret) { |
145 | dev_err(dev, "Not found maxim,tsc-irq property\n"); |
146 | return -EINVAL; |
147 | } |
148 | return 0; |
149 | } |
150 | |
151 | static int max8925_probe(struct i2c_client *client, |
152 | const struct i2c_device_id *id) |
153 | { |
154 | struct max8925_platform_data *pdata = client->dev.platform_data; |
155 | static struct max8925_chip *chip; |
156 | struct device_node *node = client->dev.of_node; |
157 | |
158 | if (node && !pdata) { |
159 | /* parse DT to get platform data */ |
160 | pdata = devm_kzalloc(&client->dev, |
161 | sizeof(struct max8925_platform_data), |
162 | GFP_KERNEL); |
163 | if (!pdata) |
164 | return -ENOMEM; |
165 | |
166 | if (max8925_dt_init(node, &client->dev, pdata)) |
167 | return -EINVAL; |
168 | } else if (!pdata) { |
169 | pr_info("%s: platform data is missing\n", __func__); |
170 | return -EINVAL; |
171 | } |
172 | |
173 | chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL); |
174 | if (chip == NULL) |
175 | return -ENOMEM; |
176 | chip->i2c = client; |
177 | chip->dev = &client->dev; |
178 | i2c_set_clientdata(client, chip); |
179 | dev_set_drvdata(chip->dev, chip); |
180 | mutex_init(&chip->io_lock); |
181 | |
182 | chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR); |
183 | i2c_set_clientdata(chip->rtc, chip); |
184 | |
185 | chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR); |
186 | i2c_set_clientdata(chip->adc, chip); |
187 | |
188 | device_init_wakeup(&client->dev, 1); |
189 | |
190 | max8925_device_init(chip, pdata); |
191 | |
192 | return 0; |
193 | } |
194 | |
195 | static int max8925_remove(struct i2c_client *client) |
196 | { |
197 | struct max8925_chip *chip = i2c_get_clientdata(client); |
198 | |
199 | max8925_device_exit(chip); |
200 | i2c_unregister_device(chip->adc); |
201 | i2c_unregister_device(chip->rtc); |
202 | kfree(chip); |
203 | return 0; |
204 | } |
205 | |
206 | #ifdef CONFIG_PM_SLEEP |
207 | static int max8925_suspend(struct device *dev) |
208 | { |
209 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
210 | struct max8925_chip *chip = i2c_get_clientdata(client); |
211 | |
212 | if (device_may_wakeup(dev) && chip->wakeup_flag) |
213 | enable_irq_wake(chip->core_irq); |
214 | return 0; |
215 | } |
216 | |
217 | static int max8925_resume(struct device *dev) |
218 | { |
219 | struct i2c_client *client = container_of(dev, struct i2c_client, dev); |
220 | struct max8925_chip *chip = i2c_get_clientdata(client); |
221 | |
222 | if (device_may_wakeup(dev) && chip->wakeup_flag) |
223 | disable_irq_wake(chip->core_irq); |
224 | return 0; |
225 | } |
226 | #endif |
227 | |
228 | static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume); |
229 | |
230 | static const struct of_device_id max8925_dt_ids[] = { |
231 | { .compatible = "maxim,max8925", }, |
232 | {}, |
233 | }; |
234 | MODULE_DEVICE_TABLE(of, max8925_dt_ids); |
235 | |
236 | static struct i2c_driver max8925_driver = { |
237 | .driver = { |
238 | .name = "max8925", |
239 | .owner = THIS_MODULE, |
240 | .pm = &max8925_pm_ops, |
241 | .of_match_table = of_match_ptr(max8925_dt_ids), |
242 | }, |
243 | .probe = max8925_probe, |
244 | .remove = max8925_remove, |
245 | .id_table = max8925_id_table, |
246 | }; |
247 | |
248 | static int __init max8925_i2c_init(void) |
249 | { |
250 | int ret; |
251 | ret = i2c_add_driver(&max8925_driver); |
252 | if (ret != 0) |
253 | pr_err("Failed to register MAX8925 I2C driver: %d\n", ret); |
254 | return ret; |
255 | } |
256 | subsys_initcall(max8925_i2c_init); |
257 | |
258 | static void __exit max8925_i2c_exit(void) |
259 | { |
260 | i2c_del_driver(&max8925_driver); |
261 | } |
262 | module_exit(max8925_i2c_exit); |
263 | |
264 | MODULE_DESCRIPTION("I2C Driver for Maxim 8925"); |
265 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
266 | MODULE_LICENSE("GPL"); |
267 |
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