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1d9f9f04 MB |
1 | /* |
2 | * Core driver for WM8400. | |
3 | * | |
4 | * Copyright 2008 Wolfson Microelectronics PLC. | |
5 | * | |
6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of the | |
11 | * License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
4e36dd33 | 15 | #include <linux/module.h> |
1d9f9f04 | 16 | #include <linux/bug.h> |
50eeef5d | 17 | #include <linux/err.h> |
1d9f9f04 MB |
18 | #include <linux/i2c.h> |
19 | #include <linux/kernel.h> | |
b8380c1a | 20 | #include <linux/mfd/core.h> |
1d9f9f04 MB |
21 | #include <linux/mfd/wm8400-private.h> |
22 | #include <linux/mfd/wm8400-audio.h> | |
50eeef5d | 23 | #include <linux/regmap.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1d9f9f04 | 25 | |
879eed68 | 26 | static bool wm8400_volatile(struct device *dev, unsigned int reg) |
1d9f9f04 | 27 | { |
879eed68 MB |
28 | switch (reg) { |
29 | case WM8400_INTERRUPT_STATUS_1: | |
30 | case WM8400_INTERRUPT_LEVELS: | |
31 | case WM8400_SHUTDOWN_REASON: | |
32 | return true; | |
33 | default: | |
34 | return false; | |
1d9f9f04 | 35 | } |
1d9f9f04 MB |
36 | } |
37 | ||
38 | /** | |
39 | * wm8400_reg_read - Single register read | |
40 | * | |
41 | * @wm8400: Pointer to wm8400 control structure | |
42 | * @reg: Register to read | |
43 | * | |
44 | * @return Read value | |
45 | */ | |
46 | u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg) | |
47 | { | |
879eed68 MB |
48 | unsigned int val; |
49 | int ret; | |
1d9f9f04 | 50 | |
879eed68 MB |
51 | ret = regmap_read(wm8400->regmap, reg, &val); |
52 | if (ret < 0) | |
53 | return ret; | |
1d9f9f04 MB |
54 | |
55 | return val; | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(wm8400_reg_read); | |
58 | ||
59 | int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data) | |
60 | { | |
879eed68 | 61 | return regmap_bulk_read(wm8400->regmap, reg, data, count); |
1d9f9f04 | 62 | } |
1d9f9f04 | 63 | |
b8380c1a MB |
64 | static int wm8400_register_codec(struct wm8400 *wm8400) |
65 | { | |
66 | struct mfd_cell cell = { | |
67 | .name = "wm8400-codec", | |
e45be4b5 SO |
68 | .platform_data = wm8400, |
69 | .pdata_size = sizeof(*wm8400), | |
b8380c1a MB |
70 | }; |
71 | ||
72 | return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0); | |
73 | } | |
74 | ||
1d9f9f04 MB |
75 | /* |
76 | * wm8400_init - Generic initialisation | |
77 | * | |
78 | * The WM8400 can be configured as either an I2C or SPI device. Probe | |
79 | * functions for each bus set up the accessors then call into this to | |
80 | * set up the device itself. | |
81 | */ | |
82 | static int wm8400_init(struct wm8400 *wm8400, | |
83 | struct wm8400_platform_data *pdata) | |
84 | { | |
879eed68 MB |
85 | unsigned int reg; |
86 | int ret; | |
1d9f9f04 | 87 | |
1902a9e6 | 88 | dev_set_drvdata(wm8400->dev, wm8400); |
1d9f9f04 MB |
89 | |
90 | /* Check that this is actually a WM8400 */ | |
879eed68 | 91 | ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, ®); |
1d9f9f04 MB |
92 | if (ret != 0) { |
93 | dev_err(wm8400->dev, "Chip ID register read failed\n"); | |
94 | return -EIO; | |
95 | } | |
879eed68 MB |
96 | if (reg != 0x6172) { |
97 | dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", | |
98 | reg); | |
1d9f9f04 MB |
99 | return -ENODEV; |
100 | } | |
101 | ||
879eed68 | 102 | ret = regmap_read(wm8400->regmap, WM8400_ID, ®); |
1d9f9f04 MB |
103 | if (ret != 0) { |
104 | dev_err(wm8400->dev, "ID register read failed: %d\n", ret); | |
105 | return ret; | |
106 | } | |
107 | reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; | |
108 | dev_info(wm8400->dev, "WM8400 revision %x\n", reg); | |
109 | ||
b8380c1a MB |
110 | ret = wm8400_register_codec(wm8400); |
111 | if (ret != 0) { | |
112 | dev_err(wm8400->dev, "Failed to register codec\n"); | |
113 | goto err_children; | |
114 | } | |
115 | ||
1d9f9f04 MB |
116 | if (pdata && pdata->platform_init) { |
117 | ret = pdata->platform_init(wm8400->dev); | |
b8380c1a | 118 | if (ret != 0) { |
1d9f9f04 MB |
119 | dev_err(wm8400->dev, "Platform init failed: %d\n", |
120 | ret); | |
b8380c1a MB |
121 | goto err_children; |
122 | } | |
1d9f9f04 MB |
123 | } else |
124 | dev_warn(wm8400->dev, "No platform initialisation supplied\n"); | |
125 | ||
b8380c1a MB |
126 | return 0; |
127 | ||
128 | err_children: | |
129 | mfd_remove_devices(wm8400->dev); | |
1d9f9f04 MB |
130 | return ret; |
131 | } | |
132 | ||
133 | static void wm8400_release(struct wm8400 *wm8400) | |
134 | { | |
b8380c1a | 135 | mfd_remove_devices(wm8400->dev); |
1d9f9f04 MB |
136 | } |
137 | ||
50eeef5d MB |
138 | static const struct regmap_config wm8400_regmap_config = { |
139 | .reg_bits = 8, | |
140 | .val_bits = 16, | |
141 | .max_register = WM8400_REGISTER_COUNT - 1, | |
879eed68 MB |
142 | |
143 | .volatile_reg = wm8400_volatile, | |
144 | ||
145 | .cache_type = REGCACHE_RBTREE, | |
50eeef5d | 146 | }; |
1d9f9f04 | 147 | |
879eed68 MB |
148 | /** |
149 | * wm8400_reset_codec_reg_cache - Reset cached codec registers to | |
150 | * their default values. | |
151 | */ | |
152 | void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) | |
153 | { | |
154 | regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); | |
157 | ||
50eeef5d | 158 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
1d9f9f04 MB |
159 | static int wm8400_i2c_probe(struct i2c_client *i2c, |
160 | const struct i2c_device_id *id) | |
161 | { | |
162 | struct wm8400 *wm8400; | |
163 | int ret; | |
164 | ||
f5772345 | 165 | wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL); |
1d9f9f04 MB |
166 | if (wm8400 == NULL) { |
167 | ret = -ENOMEM; | |
168 | goto err; | |
169 | } | |
170 | ||
2b40e9d9 | 171 | wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config); |
50eeef5d MB |
172 | if (IS_ERR(wm8400->regmap)) { |
173 | ret = PTR_ERR(wm8400->regmap); | |
f5772345 | 174 | goto err; |
50eeef5d MB |
175 | } |
176 | ||
1d9f9f04 MB |
177 | wm8400->dev = &i2c->dev; |
178 | i2c_set_clientdata(i2c, wm8400); | |
179 | ||
180 | ret = wm8400_init(wm8400, i2c->dev.platform_data); | |
181 | if (ret != 0) | |
2b40e9d9 | 182 | goto err; |
1d9f9f04 MB |
183 | |
184 | return 0; | |
185 | ||
1d9f9f04 MB |
186 | err: |
187 | return ret; | |
188 | } | |
189 | ||
190 | static int wm8400_i2c_remove(struct i2c_client *i2c) | |
191 | { | |
192 | struct wm8400 *wm8400 = i2c_get_clientdata(i2c); | |
193 | ||
194 | wm8400_release(wm8400); | |
1d9f9f04 MB |
195 | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static const struct i2c_device_id wm8400_i2c_id[] = { | |
200 | { "wm8400", 0 }, | |
201 | { } | |
202 | }; | |
203 | MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id); | |
204 | ||
205 | static struct i2c_driver wm8400_i2c_driver = { | |
206 | .driver = { | |
207 | .name = "WM8400", | |
208 | .owner = THIS_MODULE, | |
209 | }, | |
210 | .probe = wm8400_i2c_probe, | |
211 | .remove = wm8400_i2c_remove, | |
212 | .id_table = wm8400_i2c_id, | |
213 | }; | |
214 | #endif | |
215 | ||
216 | static int __init wm8400_module_init(void) | |
217 | { | |
218 | int ret = -ENODEV; | |
219 | ||
220 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
221 | ret = i2c_add_driver(&wm8400_i2c_driver); | |
222 | if (ret != 0) | |
223 | pr_err("Failed to register I2C driver: %d\n", ret); | |
224 | #endif | |
225 | ||
226 | return ret; | |
227 | } | |
2021de87 | 228 | subsys_initcall(wm8400_module_init); |
1d9f9f04 MB |
229 | |
230 | static void __exit wm8400_module_exit(void) | |
231 | { | |
232 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) | |
233 | i2c_del_driver(&wm8400_i2c_driver); | |
234 | #endif | |
235 | } | |
236 | module_exit(wm8400_module_exit); | |
237 | ||
238 | MODULE_LICENSE("GPL"); | |
239 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |