]>
Commit | Line | Data |
---|---|---|
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 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/bug.h> | |
17 | #include <linux/err.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/mfd/core.h> | |
21 | #include <linux/mfd/wm8400-private.h> | |
22 | #include <linux/mfd/wm8400-audio.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/slab.h> | |
25 | ||
26 | static bool wm8400_volatile(struct device *dev, unsigned int reg) | |
27 | { | |
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; | |
35 | } | |
36 | } | |
37 | ||
38 | int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data) | |
39 | { | |
40 | return regmap_bulk_read(wm8400->regmap, reg, data, count); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(wm8400_block_read); | |
43 | ||
44 | static int wm8400_register_codec(struct wm8400 *wm8400) | |
45 | { | |
46 | const struct mfd_cell cell = { | |
47 | .name = "wm8400-codec", | |
48 | .platform_data = wm8400, | |
49 | .pdata_size = sizeof(*wm8400), | |
50 | }; | |
51 | ||
52 | return devm_mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0, NULL); | |
53 | } | |
54 | ||
55 | /* | |
56 | * wm8400_init - Generic initialisation | |
57 | * | |
58 | * The WM8400 can be configured as either an I2C or SPI device. Probe | |
59 | * functions for each bus set up the accessors then call into this to | |
60 | * set up the device itself. | |
61 | */ | |
62 | static int wm8400_init(struct wm8400 *wm8400, | |
63 | struct wm8400_platform_data *pdata) | |
64 | { | |
65 | unsigned int reg; | |
66 | int ret; | |
67 | ||
68 | dev_set_drvdata(wm8400->dev, wm8400); | |
69 | ||
70 | /* Check that this is actually a WM8400 */ | |
71 | ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, ®); | |
72 | if (ret != 0) { | |
73 | dev_err(wm8400->dev, "Chip ID register read failed\n"); | |
74 | return -EIO; | |
75 | } | |
76 | if (reg != 0x6172) { | |
77 | dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", | |
78 | reg); | |
79 | return -ENODEV; | |
80 | } | |
81 | ||
82 | ret = regmap_read(wm8400->regmap, WM8400_ID, ®); | |
83 | if (ret != 0) { | |
84 | dev_err(wm8400->dev, "ID register read failed: %d\n", ret); | |
85 | return ret; | |
86 | } | |
87 | reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; | |
88 | dev_info(wm8400->dev, "WM8400 revision %x\n", reg); | |
89 | ||
90 | ret = wm8400_register_codec(wm8400); | |
91 | if (ret != 0) { | |
92 | dev_err(wm8400->dev, "Failed to register codec\n"); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | if (pdata && pdata->platform_init) { | |
97 | ret = pdata->platform_init(wm8400->dev); | |
98 | if (ret != 0) { | |
99 | dev_err(wm8400->dev, "Platform init failed: %d\n", | |
100 | ret); | |
101 | return ret; | |
102 | } | |
103 | } else | |
104 | dev_warn(wm8400->dev, "No platform initialisation supplied\n"); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static const struct regmap_config wm8400_regmap_config = { | |
110 | .reg_bits = 8, | |
111 | .val_bits = 16, | |
112 | .max_register = WM8400_REGISTER_COUNT - 1, | |
113 | ||
114 | .volatile_reg = wm8400_volatile, | |
115 | ||
116 | .cache_type = REGCACHE_RBTREE, | |
117 | }; | |
118 | ||
119 | /** | |
120 | * wm8400_reset_codec_reg_cache - Reset cached codec registers to | |
121 | * their default values. | |
122 | */ | |
123 | void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) | |
124 | { | |
125 | regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config); | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); | |
128 | ||
129 | #if IS_ENABLED(CONFIG_I2C) | |
130 | static int wm8400_i2c_probe(struct i2c_client *i2c, | |
131 | const struct i2c_device_id *id) | |
132 | { | |
133 | struct wm8400 *wm8400; | |
134 | ||
135 | wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL); | |
136 | if (!wm8400) | |
137 | return -ENOMEM; | |
138 | ||
139 | wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config); | |
140 | if (IS_ERR(wm8400->regmap)) | |
141 | return PTR_ERR(wm8400->regmap); | |
142 | ||
143 | wm8400->dev = &i2c->dev; | |
144 | i2c_set_clientdata(i2c, wm8400); | |
145 | ||
146 | return wm8400_init(wm8400, dev_get_platdata(&i2c->dev)); | |
147 | } | |
148 | ||
149 | static const struct i2c_device_id wm8400_i2c_id[] = { | |
150 | { "wm8400", 0 }, | |
151 | { } | |
152 | }; | |
153 | MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id); | |
154 | ||
155 | static struct i2c_driver wm8400_i2c_driver = { | |
156 | .driver = { | |
157 | .name = "WM8400", | |
158 | }, | |
159 | .probe = wm8400_i2c_probe, | |
160 | .id_table = wm8400_i2c_id, | |
161 | }; | |
162 | #endif | |
163 | ||
164 | static int __init wm8400_module_init(void) | |
165 | { | |
166 | int ret = -ENODEV; | |
167 | ||
168 | #if IS_ENABLED(CONFIG_I2C) | |
169 | ret = i2c_add_driver(&wm8400_i2c_driver); | |
170 | if (ret != 0) | |
171 | pr_err("Failed to register I2C driver: %d\n", ret); | |
172 | #endif | |
173 | ||
174 | return ret; | |
175 | } | |
176 | subsys_initcall(wm8400_module_init); | |
177 | ||
178 | static void __exit wm8400_module_exit(void) | |
179 | { | |
180 | #if IS_ENABLED(CONFIG_I2C) | |
181 | i2c_del_driver(&wm8400_i2c_driver); | |
182 | #endif | |
183 | } | |
184 | module_exit(wm8400_module_exit); | |
185 | ||
186 | MODULE_LICENSE("GPL"); | |
187 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |