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1 | /* |
2 | * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs | |
3 | * | |
4 | * Copyright 2009,2010 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 modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
87d1906d | 17 | #include <linux/pm.h> |
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18 | #include <linux/spi/spi.h> |
19 | ||
20 | #include <linux/mfd/wm831x/core.h> | |
21 | ||
22 | static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg, | |
23 | int bytes, void *dest) | |
24 | { | |
25 | u16 tx_val; | |
26 | u16 *d = dest; | |
27 | int r, ret; | |
28 | ||
29 | /* Go register at a time */ | |
30 | for (r = reg; r < reg + (bytes / 2); r++) { | |
31 | tx_val = r | 0x8000; | |
32 | ||
33 | ret = spi_write_then_read(wm831x->control_data, | |
34 | (u8 *)&tx_val, 2, (u8 *)d, 2); | |
35 | if (ret != 0) | |
36 | return ret; | |
37 | ||
38 | *d = be16_to_cpu(*d); | |
39 | ||
40 | d++; | |
41 | } | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg, | |
47 | int bytes, void *src) | |
48 | { | |
49 | struct spi_device *spi = wm831x->control_data; | |
50 | u16 *s = src; | |
51 | u16 data[2]; | |
52 | int ret, r; | |
53 | ||
54 | /* Go register at a time */ | |
55 | for (r = reg; r < reg + (bytes / 2); r++) { | |
56 | data[0] = r; | |
57 | data[1] = *s++; | |
58 | ||
59 | ret = spi_write(spi, (char *)&data, sizeof(data)); | |
60 | if (ret != 0) | |
61 | return ret; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static int __devinit wm831x_spi_probe(struct spi_device *spi) | |
68 | { | |
69 | struct wm831x *wm831x; | |
70 | enum wm831x_parent type; | |
71 | ||
72 | /* Currently SPI support for ID tables is unmerged, we're faking it */ | |
73 | if (strcmp(spi->modalias, "wm8310") == 0) | |
74 | type = WM8310; | |
75 | else if (strcmp(spi->modalias, "wm8311") == 0) | |
76 | type = WM8311; | |
77 | else if (strcmp(spi->modalias, "wm8312") == 0) | |
78 | type = WM8312; | |
79 | else if (strcmp(spi->modalias, "wm8320") == 0) | |
80 | type = WM8320; | |
81 | else if (strcmp(spi->modalias, "wm8321") == 0) | |
82 | type = WM8321; | |
83 | else if (strcmp(spi->modalias, "wm8325") == 0) | |
84 | type = WM8325; | |
412dc11d MB |
85 | else if (strcmp(spi->modalias, "wm8326") == 0) |
86 | type = WM8326; | |
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87 | else { |
88 | dev_err(&spi->dev, "Unknown device type\n"); | |
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL); | |
93 | if (wm831x == NULL) | |
94 | return -ENOMEM; | |
95 | ||
96 | spi->bits_per_word = 16; | |
97 | spi->mode = SPI_MODE_0; | |
98 | ||
99 | dev_set_drvdata(&spi->dev, wm831x); | |
100 | wm831x->dev = &spi->dev; | |
101 | wm831x->control_data = spi; | |
102 | wm831x->read_dev = wm831x_spi_read_device; | |
103 | wm831x->write_dev = wm831x_spi_write_device; | |
104 | ||
105 | return wm831x_device_init(wm831x, type, spi->irq); | |
106 | } | |
107 | ||
108 | static int __devexit wm831x_spi_remove(struct spi_device *spi) | |
109 | { | |
110 | struct wm831x *wm831x = dev_get_drvdata(&spi->dev); | |
111 | ||
112 | wm831x_device_exit(wm831x); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
87d1906d | 117 | static int wm831x_spi_suspend(struct device *dev) |
2aa13b9e | 118 | { |
87d1906d | 119 | struct wm831x *wm831x = dev_get_drvdata(dev); |
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120 | |
121 | return wm831x_device_suspend(wm831x); | |
122 | } | |
123 | ||
87d1906d MB |
124 | static const struct dev_pm_ops wm831x_spi_pm = { |
125 | .freeze = wm831x_spi_suspend, | |
126 | .suspend = wm831x_spi_suspend, | |
127 | }; | |
128 | ||
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129 | static struct spi_driver wm8310_spi_driver = { |
130 | .driver = { | |
131 | .name = "wm8310", | |
132 | .bus = &spi_bus_type, | |
133 | .owner = THIS_MODULE, | |
87d1906d | 134 | .pm = &wm831x_spi_pm, |
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135 | }, |
136 | .probe = wm831x_spi_probe, | |
137 | .remove = __devexit_p(wm831x_spi_remove), | |
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138 | }; |
139 | ||
140 | static struct spi_driver wm8311_spi_driver = { | |
141 | .driver = { | |
142 | .name = "wm8311", | |
143 | .bus = &spi_bus_type, | |
144 | .owner = THIS_MODULE, | |
87d1906d | 145 | .pm = &wm831x_spi_pm, |
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146 | }, |
147 | .probe = wm831x_spi_probe, | |
148 | .remove = __devexit_p(wm831x_spi_remove), | |
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149 | }; |
150 | ||
151 | static struct spi_driver wm8312_spi_driver = { | |
152 | .driver = { | |
153 | .name = "wm8312", | |
154 | .bus = &spi_bus_type, | |
155 | .owner = THIS_MODULE, | |
87d1906d | 156 | .pm = &wm831x_spi_pm, |
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157 | }, |
158 | .probe = wm831x_spi_probe, | |
159 | .remove = __devexit_p(wm831x_spi_remove), | |
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160 | }; |
161 | ||
162 | static struct spi_driver wm8320_spi_driver = { | |
163 | .driver = { | |
164 | .name = "wm8320", | |
165 | .bus = &spi_bus_type, | |
166 | .owner = THIS_MODULE, | |
87d1906d | 167 | .pm = &wm831x_spi_pm, |
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168 | }, |
169 | .probe = wm831x_spi_probe, | |
170 | .remove = __devexit_p(wm831x_spi_remove), | |
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171 | }; |
172 | ||
173 | static struct spi_driver wm8321_spi_driver = { | |
174 | .driver = { | |
175 | .name = "wm8321", | |
176 | .bus = &spi_bus_type, | |
177 | .owner = THIS_MODULE, | |
87d1906d | 178 | .pm = &wm831x_spi_pm, |
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179 | }, |
180 | .probe = wm831x_spi_probe, | |
181 | .remove = __devexit_p(wm831x_spi_remove), | |
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182 | }; |
183 | ||
184 | static struct spi_driver wm8325_spi_driver = { | |
185 | .driver = { | |
186 | .name = "wm8325", | |
187 | .bus = &spi_bus_type, | |
188 | .owner = THIS_MODULE, | |
87d1906d | 189 | .pm = &wm831x_spi_pm, |
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190 | }, |
191 | .probe = wm831x_spi_probe, | |
192 | .remove = __devexit_p(wm831x_spi_remove), | |
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193 | }; |
194 | ||
412dc11d MB |
195 | static struct spi_driver wm8326_spi_driver = { |
196 | .driver = { | |
197 | .name = "wm8326", | |
198 | .bus = &spi_bus_type, | |
199 | .owner = THIS_MODULE, | |
87d1906d | 200 | .pm = &wm831x_spi_pm, |
412dc11d MB |
201 | }, |
202 | .probe = wm831x_spi_probe, | |
203 | .remove = __devexit_p(wm831x_spi_remove), | |
412dc11d MB |
204 | }; |
205 | ||
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206 | static int __init wm831x_spi_init(void) |
207 | { | |
208 | int ret; | |
209 | ||
210 | ret = spi_register_driver(&wm8310_spi_driver); | |
211 | if (ret != 0) | |
212 | pr_err("Failed to register WM8310 SPI driver: %d\n", ret); | |
213 | ||
214 | ret = spi_register_driver(&wm8311_spi_driver); | |
215 | if (ret != 0) | |
216 | pr_err("Failed to register WM8311 SPI driver: %d\n", ret); | |
217 | ||
218 | ret = spi_register_driver(&wm8312_spi_driver); | |
219 | if (ret != 0) | |
220 | pr_err("Failed to register WM8312 SPI driver: %d\n", ret); | |
221 | ||
222 | ret = spi_register_driver(&wm8320_spi_driver); | |
223 | if (ret != 0) | |
224 | pr_err("Failed to register WM8320 SPI driver: %d\n", ret); | |
225 | ||
226 | ret = spi_register_driver(&wm8321_spi_driver); | |
227 | if (ret != 0) | |
228 | pr_err("Failed to register WM8321 SPI driver: %d\n", ret); | |
229 | ||
230 | ret = spi_register_driver(&wm8325_spi_driver); | |
231 | if (ret != 0) | |
232 | pr_err("Failed to register WM8325 SPI driver: %d\n", ret); | |
233 | ||
412dc11d MB |
234 | ret = spi_register_driver(&wm8326_spi_driver); |
235 | if (ret != 0) | |
236 | pr_err("Failed to register WM8326 SPI driver: %d\n", ret); | |
237 | ||
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238 | return 0; |
239 | } | |
240 | subsys_initcall(wm831x_spi_init); | |
241 | ||
242 | static void __exit wm831x_spi_exit(void) | |
243 | { | |
412dc11d | 244 | spi_unregister_driver(&wm8326_spi_driver); |
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245 | spi_unregister_driver(&wm8325_spi_driver); |
246 | spi_unregister_driver(&wm8321_spi_driver); | |
247 | spi_unregister_driver(&wm8320_spi_driver); | |
248 | spi_unregister_driver(&wm8312_spi_driver); | |
249 | spi_unregister_driver(&wm8311_spi_driver); | |
250 | spi_unregister_driver(&wm8310_spi_driver); | |
251 | } | |
252 | module_exit(wm831x_spi_exit); | |
253 | ||
254 | MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs"); | |
255 | MODULE_LICENSE("GPL"); | |
256 | MODULE_AUTHOR("Mark Brown"); |