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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
21static 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
37static 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
52int 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}
67EXPORT_SYMBOL(max8925_reg_read);
68
69int 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}
81EXPORT_SYMBOL(max8925_reg_write);
82
83int 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}
95EXPORT_SYMBOL(max8925_bulk_read);
96
97int 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}
109EXPORT_SYMBOL(max8925_bulk_write);
110
111int 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);
125out:
126 mutex_unlock(&chip->io_lock);
127 return ret;
128}
129EXPORT_SYMBOL(max8925_set_bits);
130
131
132static const struct i2c_device_id max8925_id_table[] = {
133 { "max8925", 0 },
134 { },
135};
136MODULE_DEVICE_TABLE(i2c, max8925_id_table);
137
138static int __devinit max8925_probe(struct i2c_client *client,
139 const struct i2c_device_id *id)
140{
141 struct max8925_platform_data *pdata = client->dev.platform_data;
142 static struct max8925_chip *chip;
143
144 if (!pdata) {
145 pr_info("%s: platform data is missing\n", __func__);
146 return -EINVAL;
147 }
148
149 chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
150 if (chip == NULL)
151 return -ENOMEM;
152 chip->i2c = client;
153 chip->dev = &client->dev;
154 i2c_set_clientdata(client, chip);
155 dev_set_drvdata(chip->dev, chip);
156 mutex_init(&chip->io_lock);
157
158 chip->rtc = i2c_new_dummy(chip->i2c->adapter, RTC_I2C_ADDR);
159 i2c_set_clientdata(chip->rtc, chip);
160
161 chip->adc = i2c_new_dummy(chip->i2c->adapter, ADC_I2C_ADDR);
162 i2c_set_clientdata(chip->adc, chip);
163
164 max8925_device_init(chip, pdata);
165
166 return 0;
167}
168
169static int __devexit max8925_remove(struct i2c_client *client)
170{
171 struct max8925_chip *chip = i2c_get_clientdata(client);
172
173 max8925_device_exit(chip);
174 i2c_unregister_device(chip->adc);
175 i2c_unregister_device(chip->rtc);
176 kfree(chip);
177 return 0;
178}
179
180static struct i2c_driver max8925_driver = {
181 .driver = {
182 .name = "max8925",
183 .owner = THIS_MODULE,
184 },
185 .probe = max8925_probe,
186 .remove = __devexit_p(max8925_remove),
187 .id_table = max8925_id_table,
188};
189
190static int __init max8925_i2c_init(void)
191{
192 int ret;
193
194 ret = i2c_add_driver(&max8925_driver);
195 if (ret != 0)
196 pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
197 return ret;
198}
199subsys_initcall(max8925_i2c_init);
200
201static void __exit max8925_i2c_exit(void)
202{
203 i2c_del_driver(&max8925_driver);
204}
205module_exit(max8925_i2c_exit);
206
207MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
208MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
209MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * I2C driver for Maxim MAX8925
4 *
5 * Copyright (C) 2009 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 */
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/platform_device.h>
11#include <linux/i2c.h>
12#include <linux/mfd/max8925.h>
13#include <linux/slab.h>
14
15#define RTC_I2C_ADDR 0x68
16#define ADC_I2C_ADDR 0x47
17
18static inline int max8925_read_device(struct i2c_client *i2c,
19 int reg, int bytes, void *dest)
20{
21 int ret;
22
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;
32}
33
34static inline int max8925_write_device(struct i2c_client *i2c,
35 int reg, int bytes, void *src)
36{
37 unsigned char buf[9];
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
49int max8925_reg_read(struct i2c_client *i2c, int reg)
50{
51 struct max8925_chip *chip = i2c_get_clientdata(i2c);
52 unsigned char data = 0;
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}
64EXPORT_SYMBOL(max8925_reg_read);
65
66int 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}
78EXPORT_SYMBOL(max8925_reg_write);
79
80int 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}
92EXPORT_SYMBOL(max8925_bulk_read);
93
94int 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}
106EXPORT_SYMBOL(max8925_bulk_write);
107
108int 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);
122out:
123 mutex_unlock(&chip->io_lock);
124 return ret;
125}
126EXPORT_SYMBOL(max8925_set_bits);
127
128
129static const struct i2c_device_id max8925_id_table[] = {
130 { "max8925", 0 },
131 { },
132};
133
134static 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
147static int max8925_probe(struct i2c_client *client,
148 const struct i2c_device_id *id)
149{
150 struct max8925_platform_data *pdata = dev_get_platdata(&client->dev);
151 struct max8925_chip *chip;
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) {
165 pr_info("%s: platform data is missing\n", __func__);
166 return -EINVAL;
167 }
168
169 chip = devm_kzalloc(&client->dev,
170 sizeof(struct max8925_chip), GFP_KERNEL);
171 if (chip == NULL)
172 return -ENOMEM;
173 chip->i2c = client;
174 chip->dev = &client->dev;
175 i2c_set_clientdata(client, chip);
176 dev_set_drvdata(chip->dev, chip);
177 mutex_init(&chip->io_lock);
178
179 chip->rtc = i2c_new_dummy_device(chip->i2c->adapter, RTC_I2C_ADDR);
180 if (IS_ERR(chip->rtc)) {
181 dev_err(chip->dev, "Failed to allocate I2C device for RTC\n");
182 return PTR_ERR(chip->rtc);
183 }
184 i2c_set_clientdata(chip->rtc, chip);
185
186 chip->adc = i2c_new_dummy_device(chip->i2c->adapter, ADC_I2C_ADDR);
187 if (IS_ERR(chip->adc)) {
188 dev_err(chip->dev, "Failed to allocate I2C device for ADC\n");
189 i2c_unregister_device(chip->rtc);
190 return PTR_ERR(chip->adc);
191 }
192 i2c_set_clientdata(chip->adc, chip);
193
194 device_init_wakeup(&client->dev, 1);
195
196 max8925_device_init(chip, pdata);
197
198 return 0;
199}
200
201static int max8925_remove(struct i2c_client *client)
202{
203 struct max8925_chip *chip = i2c_get_clientdata(client);
204
205 max8925_device_exit(chip);
206 i2c_unregister_device(chip->adc);
207 i2c_unregister_device(chip->rtc);
208 return 0;
209}
210
211#ifdef CONFIG_PM_SLEEP
212static int max8925_suspend(struct device *dev)
213{
214 struct i2c_client *client = to_i2c_client(dev);
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
222static int max8925_resume(struct device *dev)
223{
224 struct i2c_client *client = to_i2c_client(dev);
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
233static SIMPLE_DEV_PM_OPS(max8925_pm_ops, max8925_suspend, max8925_resume);
234
235static const struct of_device_id max8925_dt_ids[] = {
236 { .compatible = "maxim,max8925", },
237 {},
238};
239
240static struct i2c_driver max8925_driver = {
241 .driver = {
242 .name = "max8925",
243 .pm = &max8925_pm_ops,
244 .of_match_table = max8925_dt_ids,
245 },
246 .probe = max8925_probe,
247 .remove = max8925_remove,
248 .id_table = max8925_id_table,
249};
250
251static int __init max8925_i2c_init(void)
252{
253 int ret;
254
255 ret = i2c_add_driver(&max8925_driver);
256 if (ret != 0)
257 pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
258
259 return ret;
260}
261subsys_initcall(max8925_i2c_init);