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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d50f8f33 HZ |
2 | /* |
3 | * I2C driver for Maxim MAX8925 | |
4 | * | |
5 | * Copyright (C) 2009 Marvell International Ltd. | |
6 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
d50f8f33 HZ |
7 | */ |
8 | #include <linux/kernel.h> | |
9eb5f9ba | 9 | #include <linux/init.h> |
d50f8f33 HZ |
10 | #include <linux/platform_device.h> |
11 | #include <linux/i2c.h> | |
12 | #include <linux/mfd/max8925.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
d50f8f33 | 14 | |
b13c0df5 HZ |
15 | #define RTC_I2C_ADDR 0x68 |
16 | #define ADC_I2C_ADDR 0x47 | |
17 | ||
d50f8f33 HZ |
18 | static inline int max8925_read_device(struct i2c_client *i2c, |
19 | int reg, int bytes, void *dest) | |
20 | { | |
d50f8f33 HZ |
21 | int ret; |
22 | ||
b13c0df5 HZ |
23 | if (bytes > 1) |
24 | ret = i2c_smbus_read_i2c_block_data(i2c, reg, bytes, dest); | |
25 | else { | |
26 | ret = i2c_smbus_read_byte_data(i2c, reg); | |
27 | if (ret < 0) | |
28 | return ret; | |
29 | *(unsigned char *)dest = (unsigned char)ret; | |
30 | } | |
31 | return ret; | |
d50f8f33 HZ |
32 | } |
33 | ||
34 | static inline int max8925_write_device(struct i2c_client *i2c, | |
35 | int reg, int bytes, void *src) | |
36 | { | |
87bd1c92 | 37 | unsigned char buf[9]; |
d50f8f33 HZ |
38 | int ret; |
39 | ||
40 | buf[0] = (unsigned char)reg; | |
41 | memcpy(&buf[1], src, bytes); | |
42 | ||
43 | ret = i2c_master_send(i2c, buf, bytes + 1); | |
44 | if (ret < 0) | |
45 | return ret; | |
46 | return 0; | |
47 | } | |
48 | ||
49 | int max8925_reg_read(struct i2c_client *i2c, int reg) | |
50 | { | |
51 | struct max8925_chip *chip = i2c_get_clientdata(i2c); | |
b13c0df5 | 52 | unsigned char data = 0; |
d50f8f33 HZ |
53 | int ret; |
54 | ||
55 | mutex_lock(&chip->io_lock); | |
56 | ret = max8925_read_device(i2c, reg, 1, &data); | |
57 | mutex_unlock(&chip->io_lock); | |
58 | ||
59 | if (ret < 0) | |
60 | return ret; | |
61 | else | |
62 | return (int)data; | |
63 | } | |
64 | EXPORT_SYMBOL(max8925_reg_read); | |
65 | ||
66 | int max8925_reg_write(struct i2c_client *i2c, int reg, | |
67 | unsigned char data) | |
68 | { | |
69 | struct max8925_chip *chip = i2c_get_clientdata(i2c); | |
70 | int ret; | |
71 | ||
72 | mutex_lock(&chip->io_lock); | |
73 | ret = max8925_write_device(i2c, reg, 1, &data); | |
74 | mutex_unlock(&chip->io_lock); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | EXPORT_SYMBOL(max8925_reg_write); | |
79 | ||
80 | int max8925_bulk_read(struct i2c_client *i2c, int reg, | |
81 | int count, unsigned char *buf) | |
82 | { | |
83 | struct max8925_chip *chip = i2c_get_clientdata(i2c); | |
84 | int ret; | |
85 | ||
86 | mutex_lock(&chip->io_lock); | |
87 | ret = max8925_read_device(i2c, reg, count, buf); | |
88 | mutex_unlock(&chip->io_lock); | |
89 | ||
90 | return ret; | |
91 | } | |
92 | EXPORT_SYMBOL(max8925_bulk_read); | |
93 | ||
94 | int max8925_bulk_write(struct i2c_client *i2c, int reg, | |
95 | int count, unsigned char *buf) | |
96 | { | |
97 | struct max8925_chip *chip = i2c_get_clientdata(i2c); | |
98 | int ret; | |
99 | ||
100 | mutex_lock(&chip->io_lock); | |
101 | ret = max8925_write_device(i2c, reg, count, buf); | |
102 | mutex_unlock(&chip->io_lock); | |
103 | ||
104 | return ret; | |
105 | } | |
106 | EXPORT_SYMBOL(max8925_bulk_write); | |
107 | ||
108 | int max8925_set_bits(struct i2c_client *i2c, int reg, | |
109 | unsigned char mask, unsigned char data) | |
110 | { | |
111 | struct max8925_chip *chip = i2c_get_clientdata(i2c); | |
112 | unsigned char value; | |
113 | int ret; | |
114 | ||
115 | mutex_lock(&chip->io_lock); | |
116 | ret = max8925_read_device(i2c, reg, 1, &value); | |
117 | if (ret < 0) | |
118 | goto out; | |
119 | value &= ~mask; | |
120 | value |= data; | |
121 | ret = max8925_write_device(i2c, reg, 1, &value); | |
122 | out: | |
123 | mutex_unlock(&chip->io_lock); | |
124 | return ret; | |
125 | } | |
126 | EXPORT_SYMBOL(max8925_set_bits); | |
127 | ||
128 | ||
129 | static const struct i2c_device_id max8925_id_table[] = { | |
130 | { "max8925", 0 }, | |
b13c0df5 | 131 | { }, |
d50f8f33 | 132 | }; |
d50f8f33 | 133 | |
4e405ae2 QX |
134 | static int max8925_dt_init(struct device_node *np, struct device *dev, |
135 | struct max8925_platform_data *pdata) | |
136 | { | |
137 | int ret; | |
138 | ||
139 | ret = of_property_read_u32(np, "maxim,tsc-irq", &pdata->tsc_irq); | |
140 | if (ret) { | |
141 | dev_err(dev, "Not found maxim,tsc-irq property\n"); | |
142 | return -EINVAL; | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | ||
f791be49 | 147 | static int max8925_probe(struct i2c_client *client, |
d50f8f33 HZ |
148 | const struct i2c_device_id *id) |
149 | { | |
334a41ce | 150 | struct max8925_platform_data *pdata = dev_get_platdata(&client->dev); |
09530751 | 151 | struct max8925_chip *chip; |
4e405ae2 QX |
152 | struct device_node *node = client->dev.of_node; |
153 | ||
154 | if (node && !pdata) { | |
155 | /* parse DT to get platform data */ | |
156 | pdata = devm_kzalloc(&client->dev, | |
157 | sizeof(struct max8925_platform_data), | |
158 | GFP_KERNEL); | |
159 | if (!pdata) | |
160 | return -ENOMEM; | |
161 | ||
162 | if (max8925_dt_init(node, &client->dev, pdata)) | |
163 | return -EINVAL; | |
164 | } else if (!pdata) { | |
d50f8f33 HZ |
165 | pr_info("%s: platform data is missing\n", __func__); |
166 | return -EINVAL; | |
167 | } | |
d50f8f33 | 168 | |
02c7d848 LJ |
169 | chip = devm_kzalloc(&client->dev, |
170 | sizeof(struct max8925_chip), GFP_KERNEL); | |
d50f8f33 HZ |
171 | if (chip == NULL) |
172 | return -ENOMEM; | |
173 | chip->i2c = client; | |
d50f8f33 | 174 | chip->dev = &client->dev; |
b13c0df5 | 175 | i2c_set_clientdata(client, chip); |
d50f8f33 | 176 | dev_set_drvdata(chip->dev, chip); |
b13c0df5 HZ |
177 | mutex_init(&chip->io_lock); |
178 | ||
ddbf6ffe WS |
179 | chip->rtc = i2c_new_dummy_device(chip->i2c->adapter, RTC_I2C_ADDR); |
180 | if (IS_ERR(chip->rtc)) { | |
96cf3ded | 181 | dev_err(chip->dev, "Failed to allocate I2C device for RTC\n"); |
ddbf6ffe | 182 | return PTR_ERR(chip->rtc); |
96cf3ded | 183 | } |
b13c0df5 HZ |
184 | i2c_set_clientdata(chip->rtc, chip); |
185 | ||
ddbf6ffe WS |
186 | chip->adc = i2c_new_dummy_device(chip->i2c->adapter, ADC_I2C_ADDR); |
187 | if (IS_ERR(chip->adc)) { | |
96cf3ded KK |
188 | dev_err(chip->dev, "Failed to allocate I2C device for ADC\n"); |
189 | i2c_unregister_device(chip->rtc); | |
ddbf6ffe | 190 | return PTR_ERR(chip->adc); |
96cf3ded | 191 | } |
b13c0df5 HZ |
192 | i2c_set_clientdata(chip->adc, chip); |
193 | ||
ba74e80e KL |
194 | device_init_wakeup(&client->dev, 1); |
195 | ||
d50f8f33 HZ |
196 | max8925_device_init(chip, pdata); |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
4740f73f | 201 | static int max8925_remove(struct i2c_client *client) |
d50f8f33 HZ |
202 | { |
203 | struct max8925_chip *chip = i2c_get_clientdata(client); | |
204 | ||
205 | max8925_device_exit(chip); | |
b13c0df5 HZ |
206 | i2c_unregister_device(chip->adc); |
207 | i2c_unregister_device(chip->rtc); | |
d50f8f33 HZ |
208 | return 0; |
209 | } | |
210 | ||
ba74e80e KL |
211 | #ifdef CONFIG_PM_SLEEP |
212 | static int max8925_suspend(struct device *dev) | |
213 | { | |
1b5420e1 | 214 | struct i2c_client *client = to_i2c_client(dev); |
ba74e80e KL |
215 | struct max8925_chip *chip = i2c_get_clientdata(client); |
216 | ||
217 | if (device_may_wakeup(dev) && chip->wakeup_flag) | |
218 | enable_irq_wake(chip->core_irq); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int max8925_resume(struct device *dev) | |
223 | { | |
1b5420e1 | 224 | struct i2c_client *client = to_i2c_client(dev); |
ba74e80e KL |
225 | struct max8925_chip *chip = i2c_get_clientdata(client); |
226 | ||
227 | if (device_may_wakeup(dev) && chip->wakeup_flag) | |
228 | disable_irq_wake(chip->core_irq); | |
229 | return 0; | |
230 | } | |
231 | #endif | |
232 | ||
233 | static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume); | |
234 | ||
4e405ae2 QX |
235 | static const struct of_device_id max8925_dt_ids[] = { |
236 | { .compatible = "maxim,max8925", }, | |
237 | {}, | |
238 | }; | |
4e405ae2 | 239 | |
d50f8f33 HZ |
240 | static struct i2c_driver max8925_driver = { |
241 | .driver = { | |
242 | .name = "max8925", | |
ba74e80e | 243 | .pm = &max8925_pm_ops, |
52c2c6eb | 244 | .of_match_table = max8925_dt_ids, |
d50f8f33 HZ |
245 | }, |
246 | .probe = max8925_probe, | |
84449216 | 247 | .remove = max8925_remove, |
d50f8f33 HZ |
248 | .id_table = max8925_id_table, |
249 | }; | |
250 | ||
251 | static int __init max8925_i2c_init(void) | |
252 | { | |
253 | int ret; | |
4ed8f718 | 254 | |
d50f8f33 HZ |
255 | ret = i2c_add_driver(&max8925_driver); |
256 | if (ret != 0) | |
257 | pr_err("Failed to register MAX8925 I2C driver: %d\n", ret); | |
4ed8f718 | 258 | |
d50f8f33 HZ |
259 | return ret; |
260 | } | |
261 | subsys_initcall(max8925_i2c_init); |