1/*
2 * I2C driver for Marvell 88PM860x
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 *
6 * Author: Haojian Zhuang <haojian.zhuang@marvell.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 version 2 as
10 * published by the Free Software Foundation.
11 */
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/regmap.h>
16#include <linux/mfd/88pm860x.h>
17
18int pm860x_reg_read(struct i2c_client *i2c, int reg)
19{
20 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
21 struct regmap *map = (i2c == chip->client) ? chip->regmap
22 : chip->regmap_companion;
23 unsigned int data;
24 int ret;
25
26 ret = regmap_read(map, reg, &data);
27 if (ret < 0)
28 return ret;
29 else
30 return (int)data;
31}
32EXPORT_SYMBOL(pm860x_reg_read);
33
34int pm860x_reg_write(struct i2c_client *i2c, int reg,
35 unsigned char data)
36{
37 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
38 struct regmap *map = (i2c == chip->client) ? chip->regmap
39 : chip->regmap_companion;
40 int ret;
41
42 ret = regmap_write(map, reg, data);
43 return ret;
44}
45EXPORT_SYMBOL(pm860x_reg_write);
46
47int pm860x_bulk_read(struct i2c_client *i2c, int reg,
48 int count, unsigned char *buf)
49{
50 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
51 struct regmap *map = (i2c == chip->client) ? chip->regmap
52 : chip->regmap_companion;
53 int ret;
54
55 ret = regmap_raw_read(map, reg, buf, count);
56 return ret;
57}
58EXPORT_SYMBOL(pm860x_bulk_read);
59
60int pm860x_bulk_write(struct i2c_client *i2c, int reg,
61 int count, unsigned char *buf)
62{
63 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
64 struct regmap *map = (i2c == chip->client) ? chip->regmap
65 : chip->regmap_companion;
66 int ret;
67
68 ret = regmap_raw_write(map, reg, buf, count);
69 return ret;
70}
71EXPORT_SYMBOL(pm860x_bulk_write);
72
73int pm860x_set_bits(struct i2c_client *i2c, int reg,
74 unsigned char mask, unsigned char data)
75{
76 struct pm860x_chip *chip = i2c_get_clientdata(i2c);
77 struct regmap *map = (i2c == chip->client) ? chip->regmap
78 : chip->regmap_companion;
79 int ret;
80
81 ret = regmap_update_bits(map, reg, mask, data);
82 return ret;
83}
84EXPORT_SYMBOL(pm860x_set_bits);
85
86static int read_device(struct i2c_client *i2c, int reg,
87 int bytes, void *dest)
88{
89 unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
90 unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
91 struct i2c_adapter *adap = i2c->adapter;
92 struct i2c_msg msg[2] = {
93 {
94 .addr = i2c->addr,
95 .flags = 0,
96 .len = 1,
97 .buf = msgbuf0
98 },
99 { .addr = i2c->addr,
100 .flags = I2C_M_RD,
101 .len = 0,
102 .buf = msgbuf1
103 },
104 };
105 int num = 1, ret = 0;
106
107 if (dest == NULL)
108 return -EINVAL;
109 msgbuf0[0] = (unsigned char)reg; /* command */
110 msg[1].len = bytes;
111
112 /* if data needs to read back, num should be 2 */
113 if (bytes > 0)
114 num = 2;
115 ret = adap->algo->master_xfer(adap, msg, num);
116 memcpy(dest, msgbuf1, bytes);
117 if (ret < 0)
118 return ret;
119 return 0;
120}
121
122static int write_device(struct i2c_client *i2c, int reg,
123 int bytes, void *src)
124{
125 unsigned char buf[2];
126 struct i2c_adapter *adap = i2c->adapter;
127 struct i2c_msg msg;
128 int ret;
129
130 buf[0] = (unsigned char)reg;
131 memcpy(&buf[1], src, bytes);
132 msg.addr = i2c->addr;
133 msg.flags = 0;
134 msg.len = bytes + 1;
135 msg.buf = buf;
136
137 ret = adap->algo->master_xfer(adap, &msg, 1);
138 if (ret < 0)
139 return ret;
140 return 0;
141}
142
143int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
144 unsigned char data)
145{
146 unsigned char zero;
147 int ret;
148
149 i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
150 read_device(i2c, 0xFA, 0, &zero);
151 read_device(i2c, 0xFB, 0, &zero);
152 read_device(i2c, 0xFF, 0, &zero);
153 ret = write_device(i2c, reg, 1, &data);
154 read_device(i2c, 0xFE, 0, &zero);
155 read_device(i2c, 0xFC, 0, &zero);
156 i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
157 return ret;
158}
159EXPORT_SYMBOL(pm860x_page_reg_write);
160
161int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
162 int count, unsigned char *buf)
163{
164 unsigned char zero = 0;
165 int ret;
166
167 i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
168 read_device(i2c, 0xfa, 0, &zero);
169 read_device(i2c, 0xfb, 0, &zero);
170 read_device(i2c, 0xff, 0, &zero);
171 ret = read_device(i2c, reg, count, buf);
172 read_device(i2c, 0xFE, 0, &zero);
173 read_device(i2c, 0xFC, 0, &zero);
174 i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
175 return ret;
176}
177EXPORT_SYMBOL(pm860x_page_bulk_read);
178