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27c6750e GG |
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 | ||
0514e9ac | 74 | if (bytes > TPS65910_MAX_REGISTER) |
27c6750e GG |
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 | ||
8f6a459a | 123 | data &= ~mask; |
27c6750e GG |
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; | |
2537df72 | 138 | struct tps65910_board *pmic_plat_data; |
e3471bdc | 139 | struct tps65910_platform_data *init_data; |
27c6750e GG |
140 | int ret = 0; |
141 | ||
2537df72 GG |
142 | pmic_plat_data = dev_get_platdata(&i2c->dev); |
143 | if (!pmic_plat_data) | |
144 | return -EINVAL; | |
145 | ||
e3471bdc GG |
146 | init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL); |
147 | if (init_data == NULL) | |
148 | return -ENOMEM; | |
149 | ||
27c6750e | 150 | tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL); |
dc7e412d JJ |
151 | if (tps65910 == NULL) { |
152 | kfree(init_data); | |
27c6750e | 153 | return -ENOMEM; |
dc7e412d | 154 | } |
27c6750e GG |
155 | |
156 | i2c_set_clientdata(i2c, tps65910); | |
157 | tps65910->dev = &i2c->dev; | |
158 | tps65910->i2c_client = i2c; | |
79557056 | 159 | tps65910->id = id->driver_data; |
27c6750e GG |
160 | tps65910->read = tps65910_i2c_read; |
161 | tps65910->write = tps65910_i2c_write; | |
162 | mutex_init(&tps65910->io_mutex); | |
163 | ||
164 | ret = mfd_add_devices(tps65910->dev, -1, | |
165 | tps65910s, ARRAY_SIZE(tps65910s), | |
166 | NULL, 0); | |
167 | if (ret < 0) | |
168 | goto err; | |
169 | ||
b1224cd1 JJ |
170 | init_data->irq = pmic_plat_data->irq; |
171 | init_data->irq_base = pmic_plat_data->irq; | |
172 | ||
2537df72 GG |
173 | tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base); |
174 | ||
1e351a95 | 175 | tps65910_irq_init(tps65910, init_data->irq, init_data); |
e3471bdc | 176 | |
dc7e412d | 177 | kfree(init_data); |
27c6750e GG |
178 | return ret; |
179 | ||
180 | err: | |
27c6750e | 181 | kfree(tps65910); |
dc7e412d | 182 | kfree(init_data); |
27c6750e GG |
183 | return ret; |
184 | } | |
185 | ||
186 | static int tps65910_i2c_remove(struct i2c_client *i2c) | |
187 | { | |
188 | struct tps65910 *tps65910 = i2c_get_clientdata(i2c); | |
189 | ||
ec2328c3 | 190 | tps65910_irq_exit(tps65910); |
1e351a95 | 191 | mfd_remove_devices(tps65910->dev); |
27c6750e GG |
192 | kfree(tps65910); |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static const struct i2c_device_id tps65910_i2c_id[] = { | |
79557056 JEC |
198 | { "tps65910", TPS65910 }, |
199 | { "tps65911", TPS65911 }, | |
27c6750e GG |
200 | { } |
201 | }; | |
202 | MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id); | |
203 | ||
204 | ||
205 | static struct i2c_driver tps65910_i2c_driver = { | |
206 | .driver = { | |
207 | .name = "tps65910", | |
208 | .owner = THIS_MODULE, | |
209 | }, | |
210 | .probe = tps65910_i2c_probe, | |
211 | .remove = tps65910_i2c_remove, | |
212 | .id_table = tps65910_i2c_id, | |
213 | }; | |
214 | ||
215 | static int __init tps65910_i2c_init(void) | |
216 | { | |
217 | return i2c_add_driver(&tps65910_i2c_driver); | |
218 | } | |
219 | /* init early so consumer devices can complete system boot */ | |
220 | subsys_initcall(tps65910_i2c_init); | |
221 | ||
222 | static void __exit tps65910_i2c_exit(void) | |
223 | { | |
224 | i2c_del_driver(&tps65910_i2c_driver); | |
225 | } | |
226 | module_exit(tps65910_i2c_exit); | |
227 | ||
228 | MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>"); | |
229 | MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>"); | |
230 | MODULE_DESCRIPTION("TPS6591x chip family multi-function driver"); | |
231 | MODULE_LICENSE("GPL"); |