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 | |
15 | int pm860x_reg_read(struct i2c_client *i2c, int reg) |
16 | { |
17 | struct pm860x_chip *chip = i2c_get_clientdata(client: 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, val: &data); |
24 | if (ret < 0) |
25 | return ret; |
26 | else |
27 | return (int)data; |
28 | } |
29 | EXPORT_SYMBOL(pm860x_reg_read); |
30 | |
31 | int pm860x_reg_write(struct i2c_client *i2c, int reg, |
32 | unsigned char data) |
33 | { |
34 | struct pm860x_chip *chip = i2c_get_clientdata(client: i2c); |
35 | struct regmap *map = (i2c == chip->client) ? chip->regmap |
36 | : chip->regmap_companion; |
37 | int ret; |
38 | |
39 | ret = regmap_write(map, reg, val: data); |
40 | return ret; |
41 | } |
42 | EXPORT_SYMBOL(pm860x_reg_write); |
43 | |
44 | int pm860x_bulk_read(struct i2c_client *i2c, int reg, |
45 | int count, unsigned char *buf) |
46 | { |
47 | struct pm860x_chip *chip = i2c_get_clientdata(client: 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, val: buf, val_len: count); |
53 | return ret; |
54 | } |
55 | EXPORT_SYMBOL(pm860x_bulk_read); |
56 | |
57 | int pm860x_bulk_write(struct i2c_client *i2c, int reg, |
58 | int count, unsigned char *buf) |
59 | { |
60 | struct pm860x_chip *chip = i2c_get_clientdata(client: 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, val: buf, val_len: count); |
66 | return ret; |
67 | } |
68 | EXPORT_SYMBOL(pm860x_bulk_write); |
69 | |
70 | int 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(client: 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, val: data); |
79 | return ret; |
80 | } |
81 | EXPORT_SYMBOL(pm860x_set_bits); |
82 | |
83 | static 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 | |
119 | static 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 | |
140 | int 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(adapter: i2c->adapter, I2C_LOCK_SEGMENT); |
147 | read_device(i2c, reg: 0xFA, bytes: 0, dest: &zero); |
148 | read_device(i2c, reg: 0xFB, bytes: 0, dest: &zero); |
149 | read_device(i2c, reg: 0xFF, bytes: 0, dest: &zero); |
150 | ret = write_device(i2c, reg, bytes: 1, src: &data); |
151 | read_device(i2c, reg: 0xFE, bytes: 0, dest: &zero); |
152 | read_device(i2c, reg: 0xFC, bytes: 0, dest: &zero); |
153 | i2c_unlock_bus(adapter: i2c->adapter, I2C_LOCK_SEGMENT); |
154 | return ret; |
155 | } |
156 | EXPORT_SYMBOL(pm860x_page_reg_write); |
157 | |
158 | int 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(adapter: i2c->adapter, I2C_LOCK_SEGMENT); |
165 | read_device(i2c, reg: 0xfa, bytes: 0, dest: &zero); |
166 | read_device(i2c, reg: 0xfb, bytes: 0, dest: &zero); |
167 | read_device(i2c, reg: 0xff, bytes: 0, dest: &zero); |
168 | ret = read_device(i2c, reg, bytes: count, dest: buf); |
169 | read_device(i2c, reg: 0xFE, bytes: 0, dest: &zero); |
170 | read_device(i2c, reg: 0xFC, bytes: 0, dest: &zero); |
171 | i2c_unlock_bus(adapter: i2c->adapter, I2C_LOCK_SEGMENT); |
172 | return ret; |
173 | } |
174 | EXPORT_SYMBOL(pm860x_page_bulk_read); |
175 | |