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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * I2C driver for Marvell 88PM860x
4 *
5 * Copyright (C) 2009 Marvell International Ltd.
6 *
7 * Author: Haojian Zhuang <haojian.zhuang@marvell.com>
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/i2c.h>
12#include <linux/regmap.h>
13#include <linux/mfd/88pm860x.h>
14
15int pm860x_reg_read(struct i2c_client *i2c, int reg)
16{
17 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
18 struct regmap *map = (i2c == chip->client) ? chip->regmap
19 : chip->regmap_companion;
20 unsigned int data;
21 int ret;
22
23 ret = regmap_read(map, reg, &data);
24 if (ret < 0)
25 return ret;
26 else
27 return (int)data;
28}
29EXPORT_SYMBOL(pm860x_reg_read);
30
31int pm860x_reg_write(struct i2c_client *i2c, int reg,
32 unsigned char data)
33{
34 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
35 struct regmap *map = (i2c == chip->client) ? chip->regmap
36 : chip->regmap_companion;
37 int ret;
38
39 ret = regmap_write(map, reg, data);
40 return ret;
41}
42EXPORT_SYMBOL(pm860x_reg_write);
43
44int pm860x_bulk_read(struct i2c_client *i2c, int reg,
45 int count, unsigned char *buf)
46{
47 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
48 struct regmap *map = (i2c == chip->client) ? chip->regmap
49 : chip->regmap_companion;
50 int ret;
51
52 ret = regmap_raw_read(map, reg, buf, count);
53 return ret;
54}
55EXPORT_SYMBOL(pm860x_bulk_read);
56
57int pm860x_bulk_write(struct i2c_client *i2c, int reg,
58 int count, unsigned char *buf)
59{
60 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
61 struct regmap *map = (i2c == chip->client) ? chip->regmap
62 : chip->regmap_companion;
63 int ret;
64
65 ret = regmap_raw_write(map, reg, buf, count);
66 return ret;
67}
68EXPORT_SYMBOL(pm860x_bulk_write);
69
70int pm860x_set_bits(struct i2c_client *i2c, int reg,
71 unsigned char mask, unsigned char data)
72{
73 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
74 struct regmap *map = (i2c == chip->client) ? chip->regmap
75 : chip->regmap_companion;
76 int ret;
77
78 ret = regmap_update_bits(map, reg, mask, data);
79 return ret;
80}
81EXPORT_SYMBOL(pm860x_set_bits);
82
83static int read_device(struct i2c_client *i2c, int reg,
84 int bytes, void *dest)
85{
86 unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
87 unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
88 struct i2c_adapter *adap = i2c->adapter;
89 struct i2c_msg msg[2] = {
90 {
91 .addr = i2c->addr,
92 .flags = 0,
93 .len = 1,
94 .buf = msgbuf0
95 },
96 { .addr = i2c->addr,
97 .flags = I2C_M_RD,
98 .len = 0,
99 .buf = msgbuf1
100 },
101 };
102 int num = 1, ret = 0;
103
104 if (dest == NULL)
105 return -EINVAL;
106 msgbuf0[0] = (unsigned char)reg; /* command */
107 msg[1].len = bytes;
108
109 /* if data needs to read back, num should be 2 */
110 if (bytes > 0)
111 num = 2;
112 ret = adap->algo->master_xfer(adap, msg, num);
113 memcpy(dest, msgbuf1, bytes);
114 if (ret < 0)
115 return ret;
116 return 0;
117}
118
119static int write_device(struct i2c_client *i2c, int reg,
120 int bytes, void *src)
121{
122 unsigned char buf[2];
123 struct i2c_adapter *adap = i2c->adapter;
124 struct i2c_msg msg;
125 int ret;
126
127 buf[0] = (unsigned char)reg;
128 memcpy(&buf[1], src, bytes);
129 msg.addr = i2c->addr;
130 msg.flags = 0;
131 msg.len = bytes + 1;
132 msg.buf = buf;
133
134 ret = adap->algo->master_xfer(adap, &msg, 1);
135 if (ret < 0)
136 return ret;
137 return 0;
138}
139
140int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
141 unsigned char data)
142{
143 unsigned char zero;
144 int ret;
145
146 i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
147 read_device(i2c, 0xFA, 0, &zero);
148 read_device(i2c, 0xFB, 0, &zero);
149 read_device(i2c, 0xFF, 0, &zero);
150 ret = write_device(i2c, reg, 1, &data);
151 read_device(i2c, 0xFE, 0, &zero);
152 read_device(i2c, 0xFC, 0, &zero);
153 i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
154 return ret;
155}
156EXPORT_SYMBOL(pm860x_page_reg_write);
157
158int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
159 int count, unsigned char *buf)
160{
161 unsigned char zero = 0;
162 int ret;
163
164 i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
165 read_device(i2c, 0xfa, 0, &zero);
166 read_device(i2c, 0xfb, 0, &zero);
167 read_device(i2c, 0xff, 0, &zero);
168 ret = read_device(i2c, reg, count, buf);
169 read_device(i2c, 0xFE, 0, &zero);
170 read_device(i2c, 0xFC, 0, &zero);
171 i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
172 return ret;
173}
174EXPORT_SYMBOL(pm860x_page_bulk_read);
1/*
2 * I2C driver for Marvell 88PM860x
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/88pm860x.h>
16#include <linux/slab.h>
17
18static inline int pm860x_read_device(struct i2c_client *i2c,
19 int reg, int bytes, void *dest)
20{
21 unsigned char data;
22 int ret;
23
24 data = (unsigned char)reg;
25 ret = i2c_master_send(i2c, &data, 1);
26 if (ret < 0)
27 return ret;
28
29 ret = i2c_master_recv(i2c, dest, bytes);
30 if (ret < 0)
31 return ret;
32 return 0;
33}
34
35static inline int pm860x_write_device(struct i2c_client *i2c,
36 int reg, int bytes, void *src)
37{
38 unsigned char buf[bytes + 1];
39 int ret;
40
41 buf[0] = (unsigned char)reg;
42 memcpy(&buf[1], src, bytes);
43
44 ret = i2c_master_send(i2c, buf, bytes + 1);
45 if (ret < 0)
46 return ret;
47 return 0;
48}
49
50int pm860x_reg_read(struct i2c_client *i2c, int reg)
51{
52 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
53 unsigned char data;
54 int ret;
55
56 mutex_lock(&chip->io_lock);
57 ret = pm860x_read_device(i2c, reg, 1, &data);
58 mutex_unlock(&chip->io_lock);
59
60 if (ret < 0)
61 return ret;
62 else
63 return (int)data;
64}
65EXPORT_SYMBOL(pm860x_reg_read);
66
67int pm860x_reg_write(struct i2c_client *i2c, int reg,
68 unsigned char data)
69{
70 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
71 int ret;
72
73 mutex_lock(&chip->io_lock);
74 ret = pm860x_write_device(i2c, reg, 1, &data);
75 mutex_unlock(&chip->io_lock);
76
77 return ret;
78}
79EXPORT_SYMBOL(pm860x_reg_write);
80
81int pm860x_bulk_read(struct i2c_client *i2c, int reg,
82 int count, unsigned char *buf)
83{
84 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
85 int ret;
86
87 mutex_lock(&chip->io_lock);
88 ret = pm860x_read_device(i2c, reg, count, buf);
89 mutex_unlock(&chip->io_lock);
90
91 return ret;
92}
93EXPORT_SYMBOL(pm860x_bulk_read);
94
95int pm860x_bulk_write(struct i2c_client *i2c, int reg,
96 int count, unsigned char *buf)
97{
98 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
99 int ret;
100
101 mutex_lock(&chip->io_lock);
102 ret = pm860x_write_device(i2c, reg, count, buf);
103 mutex_unlock(&chip->io_lock);
104
105 return ret;
106}
107EXPORT_SYMBOL(pm860x_bulk_write);
108
109int pm860x_set_bits(struct i2c_client *i2c, int reg,
110 unsigned char mask, unsigned char data)
111{
112 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
113 unsigned char value;
114 int ret;
115
116 mutex_lock(&chip->io_lock);
117 ret = pm860x_read_device(i2c, reg, 1, &value);
118 if (ret < 0)
119 goto out;
120 value &= ~mask;
121 value |= data;
122 ret = pm860x_write_device(i2c, reg, 1, &value);
123out:
124 mutex_unlock(&chip->io_lock);
125 return ret;
126}
127EXPORT_SYMBOL(pm860x_set_bits);
128
129int pm860x_page_reg_read(struct i2c_client *i2c, int reg)
130{
131 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
132 unsigned char zero = 0;
133 unsigned char data;
134 int ret;
135
136 mutex_lock(&chip->io_lock);
137 pm860x_write_device(i2c, 0xFA, 0, &zero);
138 pm860x_write_device(i2c, 0xFB, 0, &zero);
139 pm860x_write_device(i2c, 0xFF, 0, &zero);
140 ret = pm860x_read_device(i2c, reg, 1, &data);
141 if (ret >= 0)
142 ret = (int)data;
143 pm860x_write_device(i2c, 0xFE, 0, &zero);
144 pm860x_write_device(i2c, 0xFC, 0, &zero);
145 mutex_unlock(&chip->io_lock);
146 return ret;
147}
148EXPORT_SYMBOL(pm860x_page_reg_read);
149
150int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
151 unsigned char data)
152{
153 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
154 unsigned char zero;
155 int ret;
156
157 mutex_lock(&chip->io_lock);
158 pm860x_write_device(i2c, 0xFA, 0, &zero);
159 pm860x_write_device(i2c, 0xFB, 0, &zero);
160 pm860x_write_device(i2c, 0xFF, 0, &zero);
161 ret = pm860x_write_device(i2c, reg, 1, &data);
162 pm860x_write_device(i2c, 0xFE, 0, &zero);
163 pm860x_write_device(i2c, 0xFC, 0, &zero);
164 mutex_unlock(&chip->io_lock);
165 return ret;
166}
167EXPORT_SYMBOL(pm860x_page_reg_write);
168
169int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
170 int count, unsigned char *buf)
171{
172 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
173 unsigned char zero = 0;
174 int ret;
175
176 mutex_lock(&chip->io_lock);
177 pm860x_write_device(i2c, 0xFA, 0, &zero);
178 pm860x_write_device(i2c, 0xFB, 0, &zero);
179 pm860x_write_device(i2c, 0xFF, 0, &zero);
180 ret = pm860x_read_device(i2c, reg, count, buf);
181 pm860x_write_device(i2c, 0xFE, 0, &zero);
182 pm860x_write_device(i2c, 0xFC, 0, &zero);
183 mutex_unlock(&chip->io_lock);
184 return ret;
185}
186EXPORT_SYMBOL(pm860x_page_bulk_read);
187
188int pm860x_page_bulk_write(struct i2c_client *i2c, int reg,
189 int count, unsigned char *buf)
190{
191 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
192 unsigned char zero = 0;
193 int ret;
194
195 mutex_lock(&chip->io_lock);
196 pm860x_write_device(i2c, 0xFA, 0, &zero);
197 pm860x_write_device(i2c, 0xFB, 0, &zero);
198 pm860x_write_device(i2c, 0xFF, 0, &zero);
199 ret = pm860x_write_device(i2c, reg, count, buf);
200 pm860x_write_device(i2c, 0xFE, 0, &zero);
201 pm860x_write_device(i2c, 0xFC, 0, &zero);
202 mutex_unlock(&chip->io_lock);
203 return ret;
204}
205EXPORT_SYMBOL(pm860x_page_bulk_write);
206
207int pm860x_page_set_bits(struct i2c_client *i2c, int reg,
208 unsigned char mask, unsigned char data)
209{
210 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
211 unsigned char zero;
212 unsigned char value;
213 int ret;
214
215 mutex_lock(&chip->io_lock);
216 pm860x_write_device(i2c, 0xFA, 0, &zero);
217 pm860x_write_device(i2c, 0xFB, 0, &zero);
218 pm860x_write_device(i2c, 0xFF, 0, &zero);
219 ret = pm860x_read_device(i2c, reg, 1, &value);
220 if (ret < 0)
221 goto out;
222 value &= ~mask;
223 value |= data;
224 ret = pm860x_write_device(i2c, reg, 1, &value);
225out:
226 pm860x_write_device(i2c, 0xFE, 0, &zero);
227 pm860x_write_device(i2c, 0xFC, 0, &zero);
228 mutex_unlock(&chip->io_lock);
229 return ret;
230}
231EXPORT_SYMBOL(pm860x_page_set_bits);
232
233static const struct i2c_device_id pm860x_id_table[] = {
234 { "88PM860x", 0 },
235 {}
236};
237MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
238
239static int verify_addr(struct i2c_client *i2c)
240{
241 unsigned short addr_8607[] = {0x30, 0x34};
242 unsigned short addr_8606[] = {0x10, 0x11};
243 int size, i;
244
245 if (i2c == NULL)
246 return 0;
247 size = ARRAY_SIZE(addr_8606);
248 for (i = 0; i < size; i++) {
249 if (i2c->addr == *(addr_8606 + i))
250 return CHIP_PM8606;
251 }
252 size = ARRAY_SIZE(addr_8607);
253 for (i = 0; i < size; i++) {
254 if (i2c->addr == *(addr_8607 + i))
255 return CHIP_PM8607;
256 }
257 return 0;
258}
259
260static int __devinit pm860x_probe(struct i2c_client *client,
261 const struct i2c_device_id *id)
262{
263 struct pm860x_platform_data *pdata = client->dev.platform_data;
264 struct pm860x_chip *chip;
265
266 if (!pdata) {
267 pr_info("No platform data in %s!\n", __func__);
268 return -EINVAL;
269 }
270
271 chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
272 if (chip == NULL)
273 return -ENOMEM;
274
275 chip->id = verify_addr(client);
276 chip->client = client;
277 i2c_set_clientdata(client, chip);
278 chip->dev = &client->dev;
279 mutex_init(&chip->io_lock);
280 dev_set_drvdata(chip->dev, chip);
281
282 /*
283 * Both client and companion client shares same platform driver.
284 * Driver distinguishes them by pdata->companion_addr.
285 * pdata->companion_addr is only assigned if companion chip exists.
286 * At the same time, the companion_addr shouldn't equal to client
287 * address.
288 */
289 if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
290 chip->companion_addr = pdata->companion_addr;
291 chip->companion = i2c_new_dummy(chip->client->adapter,
292 chip->companion_addr);
293 i2c_set_clientdata(chip->companion, chip);
294 }
295
296 pm860x_device_init(chip, pdata);
297 return 0;
298}
299
300static int __devexit pm860x_remove(struct i2c_client *client)
301{
302 struct pm860x_chip *chip = i2c_get_clientdata(client);
303
304 pm860x_device_exit(chip);
305 i2c_unregister_device(chip->companion);
306 kfree(chip);
307 return 0;
308}
309
310static struct i2c_driver pm860x_driver = {
311 .driver = {
312 .name = "88PM860x",
313 .owner = THIS_MODULE,
314 },
315 .probe = pm860x_probe,
316 .remove = __devexit_p(pm860x_remove),
317 .id_table = pm860x_id_table,
318};
319
320static int __init pm860x_i2c_init(void)
321{
322 int ret;
323 ret = i2c_add_driver(&pm860x_driver);
324 if (ret != 0)
325 pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
326 return ret;
327}
328subsys_initcall(pm860x_i2c_init);
329
330static void __exit pm860x_i2c_exit(void)
331{
332 i2c_del_driver(&pm860x_driver);
333}
334module_exit(pm860x_i2c_exit);
335
336MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
337MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
338MODULE_LICENSE("GPL");