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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1d9f9f04 MB |
2 | /* |
3 | * Core driver for WM8400. | |
4 | * | |
5 | * Copyright 2008 Wolfson Microelectronics PLC. | |
6 | * | |
7 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
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8 | */ |
9 | ||
b2b65875 | 10 | #include <linux/init.h> |
1d9f9f04 | 11 | #include <linux/bug.h> |
50eeef5d | 12 | #include <linux/err.h> |
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13 | #include <linux/i2c.h> |
14 | #include <linux/kernel.h> | |
b8380c1a | 15 | #include <linux/mfd/core.h> |
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16 | #include <linux/mfd/wm8400-private.h> |
17 | #include <linux/mfd/wm8400-audio.h> | |
50eeef5d | 18 | #include <linux/regmap.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
1d9f9f04 | 20 | |
879eed68 | 21 | static bool wm8400_volatile(struct device *dev, unsigned int reg) |
1d9f9f04 | 22 | { |
879eed68 MB |
23 | switch (reg) { |
24 | case WM8400_INTERRUPT_STATUS_1: | |
25 | case WM8400_INTERRUPT_LEVELS: | |
26 | case WM8400_SHUTDOWN_REASON: | |
27 | return true; | |
28 | default: | |
29 | return false; | |
1d9f9f04 | 30 | } |
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31 | } |
32 | ||
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33 | static int wm8400_register_codec(struct wm8400 *wm8400) |
34 | { | |
d1fb70e2 | 35 | const struct mfd_cell cell = { |
b8380c1a | 36 | .name = "wm8400-codec", |
e45be4b5 SO |
37 | .platform_data = wm8400, |
38 | .pdata_size = sizeof(*wm8400), | |
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39 | }; |
40 | ||
7825dc05 | 41 | return devm_mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0, NULL); |
b8380c1a MB |
42 | } |
43 | ||
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44 | /* |
45 | * wm8400_init - Generic initialisation | |
46 | * | |
47 | * The WM8400 can be configured as either an I2C or SPI device. Probe | |
48 | * functions for each bus set up the accessors then call into this to | |
49 | * set up the device itself. | |
50 | */ | |
51 | static int wm8400_init(struct wm8400 *wm8400, | |
52 | struct wm8400_platform_data *pdata) | |
53 | { | |
879eed68 MB |
54 | unsigned int reg; |
55 | int ret; | |
1d9f9f04 | 56 | |
1902a9e6 | 57 | dev_set_drvdata(wm8400->dev, wm8400); |
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58 | |
59 | /* Check that this is actually a WM8400 */ | |
879eed68 | 60 | ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, ®); |
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61 | if (ret != 0) { |
62 | dev_err(wm8400->dev, "Chip ID register read failed\n"); | |
63 | return -EIO; | |
64 | } | |
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65 | if (reg != 0x6172) { |
66 | dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n", | |
67 | reg); | |
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68 | return -ENODEV; |
69 | } | |
70 | ||
879eed68 | 71 | ret = regmap_read(wm8400->regmap, WM8400_ID, ®); |
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72 | if (ret != 0) { |
73 | dev_err(wm8400->dev, "ID register read failed: %d\n", ret); | |
74 | return ret; | |
75 | } | |
76 | reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT; | |
77 | dev_info(wm8400->dev, "WM8400 revision %x\n", reg); | |
78 | ||
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79 | ret = wm8400_register_codec(wm8400); |
80 | if (ret != 0) { | |
81 | dev_err(wm8400->dev, "Failed to register codec\n"); | |
7825dc05 | 82 | return ret; |
b8380c1a MB |
83 | } |
84 | ||
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85 | if (pdata && pdata->platform_init) { |
86 | ret = pdata->platform_init(wm8400->dev); | |
b8380c1a | 87 | if (ret != 0) { |
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88 | dev_err(wm8400->dev, "Platform init failed: %d\n", |
89 | ret); | |
7825dc05 | 90 | return ret; |
b8380c1a | 91 | } |
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92 | } else |
93 | dev_warn(wm8400->dev, "No platform initialisation supplied\n"); | |
94 | ||
b8380c1a | 95 | return 0; |
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96 | } |
97 | ||
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98 | static const struct regmap_config wm8400_regmap_config = { |
99 | .reg_bits = 8, | |
100 | .val_bits = 16, | |
101 | .max_register = WM8400_REGISTER_COUNT - 1, | |
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102 | |
103 | .volatile_reg = wm8400_volatile, | |
104 | ||
105 | .cache_type = REGCACHE_RBTREE, | |
50eeef5d | 106 | }; |
1d9f9f04 | 107 | |
879eed68 MB |
108 | /** |
109 | * wm8400_reset_codec_reg_cache - Reset cached codec registers to | |
110 | * their default values. | |
f139ef70 LJ |
111 | * |
112 | * @wm8400: pointer to local driver data structure | |
879eed68 MB |
113 | */ |
114 | void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400) | |
115 | { | |
116 | regmap_reinit_cache(wm8400->regmap, &wm8400_regmap_config); | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache); | |
119 | ||
5eb519f3 | 120 | #if IS_ENABLED(CONFIG_I2C) |
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121 | static int wm8400_i2c_probe(struct i2c_client *i2c, |
122 | const struct i2c_device_id *id) | |
123 | { | |
124 | struct wm8400 *wm8400; | |
1d9f9f04 | 125 | |
f5772345 | 126 | wm8400 = devm_kzalloc(&i2c->dev, sizeof(struct wm8400), GFP_KERNEL); |
82ae61c4 SK |
127 | if (!wm8400) |
128 | return -ENOMEM; | |
1d9f9f04 | 129 | |
2b40e9d9 | 130 | wm8400->regmap = devm_regmap_init_i2c(i2c, &wm8400_regmap_config); |
82ae61c4 SK |
131 | if (IS_ERR(wm8400->regmap)) |
132 | return PTR_ERR(wm8400->regmap); | |
50eeef5d | 133 | |
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134 | wm8400->dev = &i2c->dev; |
135 | i2c_set_clientdata(i2c, wm8400); | |
136 | ||
82ae61c4 | 137 | return wm8400_init(wm8400, dev_get_platdata(&i2c->dev)); |
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138 | } |
139 | ||
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140 | static const struct i2c_device_id wm8400_i2c_id[] = { |
141 | { "wm8400", 0 }, | |
142 | { } | |
143 | }; | |
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144 | |
145 | static struct i2c_driver wm8400_i2c_driver = { | |
146 | .driver = { | |
147 | .name = "WM8400", | |
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148 | }, |
149 | .probe = wm8400_i2c_probe, | |
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150 | .id_table = wm8400_i2c_id, |
151 | }; | |
152 | #endif | |
153 | ||
b2b65875 | 154 | static int __init wm8400_driver_init(void) |
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155 | { |
156 | int ret = -ENODEV; | |
157 | ||
5eb519f3 | 158 | #if IS_ENABLED(CONFIG_I2C) |
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159 | ret = i2c_add_driver(&wm8400_i2c_driver); |
160 | if (ret != 0) | |
161 | pr_err("Failed to register I2C driver: %d\n", ret); | |
162 | #endif | |
163 | ||
164 | return ret; | |
165 | } | |
b2b65875 | 166 | subsys_initcall(wm8400_driver_init); |