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1 | /* |
2 | * tps65910.c -- TI TPS6591x | |
3 | * | |
4 | * Copyright 2010 Texas Instruments Inc. | |
5 | * | |
6 | * Author: Graeme Gregory <gg@slimlogic.co.uk> | |
7 | * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/gpio.h> | |
22 | #include <linux/mfd/core.h> | |
23 | #include <linux/mfd/tps65910.h> | |
24 | ||
25 | static struct mfd_cell tps65910s[] = { | |
26 | { | |
27 | .name = "tps65910-pmic", | |
28 | }, | |
29 | { | |
30 | .name = "tps65910-rtc", | |
31 | }, | |
32 | { | |
33 | .name = "tps65910-power", | |
34 | }, | |
35 | }; | |
36 | ||
37 | ||
38 | static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg, | |
39 | int bytes, void *dest) | |
40 | { | |
41 | struct i2c_client *i2c = tps65910->i2c_client; | |
42 | struct i2c_msg xfer[2]; | |
43 | int ret; | |
44 | ||
45 | /* Write register */ | |
46 | xfer[0].addr = i2c->addr; | |
47 | xfer[0].flags = 0; | |
48 | xfer[0].len = 1; | |
49 | xfer[0].buf = ® | |
50 | ||
51 | /* Read data */ | |
52 | xfer[1].addr = i2c->addr; | |
53 | xfer[1].flags = I2C_M_RD; | |
54 | xfer[1].len = bytes; | |
55 | xfer[1].buf = dest; | |
56 | ||
57 | ret = i2c_transfer(i2c->adapter, xfer, 2); | |
58 | if (ret == 2) | |
59 | ret = 0; | |
60 | else if (ret >= 0) | |
61 | ret = -EIO; | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg, | |
67 | int bytes, void *src) | |
68 | { | |
69 | struct i2c_client *i2c = tps65910->i2c_client; | |
70 | /* we add 1 byte for device register */ | |
71 | u8 msg[TPS65910_MAX_REGISTER + 1]; | |
72 | int ret; | |
73 | ||
74 | if (bytes > (TPS65910_MAX_REGISTER + 1)) | |
75 | return -EINVAL; | |
76 | ||
77 | msg[0] = reg; | |
78 | memcpy(&msg[1], src, bytes); | |
79 | ||
80 | ret = i2c_master_send(i2c, msg, bytes + 1); | |
81 | if (ret < 0) | |
82 | return ret; | |
83 | if (ret != bytes + 1) | |
84 | return -EIO; | |
85 | return 0; | |
86 | } | |
87 | ||
88 | int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask) | |
89 | { | |
90 | u8 data; | |
91 | int err; | |
92 | ||
93 | mutex_lock(&tps65910->io_mutex); | |
94 | err = tps65910_i2c_read(tps65910, reg, 1, &data); | |
95 | if (err) { | |
96 | dev_err(tps65910->dev, "read from reg %x failed\n", reg); | |
97 | goto out; | |
98 | } | |
99 | ||
100 | data |= mask; | |
101 | err = tps65910_i2c_write(tps65910, reg, 1, &data); | |
102 | if (err) | |
103 | dev_err(tps65910->dev, "write to reg %x failed\n", reg); | |
104 | ||
105 | out: | |
106 | mutex_unlock(&tps65910->io_mutex); | |
107 | return err; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(tps65910_set_bits); | |
110 | ||
111 | int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask) | |
112 | { | |
113 | u8 data; | |
114 | int err; | |
115 | ||
116 | mutex_lock(&tps65910->io_mutex); | |
117 | err = tps65910_i2c_read(tps65910, reg, 1, &data); | |
118 | if (err) { | |
119 | dev_err(tps65910->dev, "read from reg %x failed\n", reg); | |
120 | goto out; | |
121 | } | |
122 | ||
123 | data &= mask; | |
124 | err = tps65910_i2c_write(tps65910, reg, 1, &data); | |
125 | if (err) | |
126 | dev_err(tps65910->dev, "write to reg %x failed\n", reg); | |
127 | ||
128 | out: | |
129 | mutex_unlock(&tps65910->io_mutex); | |
130 | return err; | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(tps65910_clear_bits); | |
133 | ||
134 | static int tps65910_i2c_probe(struct i2c_client *i2c, | |
135 | const struct i2c_device_id *id) | |
136 | { | |
137 | struct tps65910 *tps65910; | |
138 | int ret = 0; | |
139 | ||
140 | tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL); | |
141 | if (tps65910 == NULL) | |
142 | return -ENOMEM; | |
143 | ||
144 | i2c_set_clientdata(i2c, tps65910); | |
145 | tps65910->dev = &i2c->dev; | |
146 | tps65910->i2c_client = i2c; | |
147 | tps65910->read = tps65910_i2c_read; | |
148 | tps65910->write = tps65910_i2c_write; | |
149 | mutex_init(&tps65910->io_mutex); | |
150 | ||
151 | ret = mfd_add_devices(tps65910->dev, -1, | |
152 | tps65910s, ARRAY_SIZE(tps65910s), | |
153 | NULL, 0); | |
154 | if (ret < 0) | |
155 | goto err; | |
156 | ||
157 | return ret; | |
158 | ||
159 | err: | |
160 | mfd_remove_devices(tps65910->dev); | |
161 | kfree(tps65910); | |
162 | return ret; | |
163 | } | |
164 | ||
165 | static int tps65910_i2c_remove(struct i2c_client *i2c) | |
166 | { | |
167 | struct tps65910 *tps65910 = i2c_get_clientdata(i2c); | |
168 | ||
169 | mfd_remove_devices(tps65910->dev); | |
170 | kfree(tps65910); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static const struct i2c_device_id tps65910_i2c_id[] = { | |
176 | { "tps65910", 0 }, | |
177 | { } | |
178 | }; | |
179 | MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id); | |
180 | ||
181 | ||
182 | static struct i2c_driver tps65910_i2c_driver = { | |
183 | .driver = { | |
184 | .name = "tps65910", | |
185 | .owner = THIS_MODULE, | |
186 | }, | |
187 | .probe = tps65910_i2c_probe, | |
188 | .remove = tps65910_i2c_remove, | |
189 | .id_table = tps65910_i2c_id, | |
190 | }; | |
191 | ||
192 | static int __init tps65910_i2c_init(void) | |
193 | { | |
194 | return i2c_add_driver(&tps65910_i2c_driver); | |
195 | } | |
196 | /* init early so consumer devices can complete system boot */ | |
197 | subsys_initcall(tps65910_i2c_init); | |
198 | ||
199 | static void __exit tps65910_i2c_exit(void) | |
200 | { | |
201 | i2c_del_driver(&tps65910_i2c_driver); | |
202 | } | |
203 | module_exit(tps65910_i2c_exit); | |
204 | ||
205 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
206 | MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>"); | |
207 | MODULE_DESCRIPTION("TPS6591x chip family multi-function driver"); | |
208 | MODULE_LICENSE("GPL"); |