diff options
Diffstat (limited to 'drivers/mfd/wm831x-spi.c')
-rw-r--r-- | drivers/mfd/wm831x-spi.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c new file mode 100644 index 000000000000..eed8e4f7a5a1 --- /dev/null +++ b/drivers/mfd/wm831x-spi.c | |||
@@ -0,0 +1,256 @@ | |||
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> | ||
17 | #include <linux/pm.h> | ||
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; | ||
85 | else if (strcmp(spi->modalias, "wm8326") == 0) | ||
86 | type = WM8326; | ||
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 | |||
117 | static int wm831x_spi_suspend(struct device *dev) | ||
118 | { | ||
119 | struct wm831x *wm831x = dev_get_drvdata(dev); | ||
120 | |||
121 | return wm831x_device_suspend(wm831x); | ||
122 | } | ||
123 | |||
124 | static const struct dev_pm_ops wm831x_spi_pm = { | ||
125 | .freeze = wm831x_spi_suspend, | ||
126 | .suspend = wm831x_spi_suspend, | ||
127 | }; | ||
128 | |||
129 | static struct spi_driver wm8310_spi_driver = { | ||
130 | .driver = { | ||
131 | .name = "wm8310", | ||
132 | .bus = &spi_bus_type, | ||
133 | .owner = THIS_MODULE, | ||
134 | .pm = &wm831x_spi_pm, | ||
135 | }, | ||
136 | .probe = wm831x_spi_probe, | ||
137 | .remove = __devexit_p(wm831x_spi_remove), | ||
138 | }; | ||
139 | |||
140 | static struct spi_driver wm8311_spi_driver = { | ||
141 | .driver = { | ||
142 | .name = "wm8311", | ||
143 | .bus = &spi_bus_type, | ||
144 | .owner = THIS_MODULE, | ||
145 | .pm = &wm831x_spi_pm, | ||
146 | }, | ||
147 | .probe = wm831x_spi_probe, | ||
148 | .remove = __devexit_p(wm831x_spi_remove), | ||
149 | }; | ||
150 | |||
151 | static struct spi_driver wm8312_spi_driver = { | ||
152 | .driver = { | ||
153 | .name = "wm8312", | ||
154 | .bus = &spi_bus_type, | ||
155 | .owner = THIS_MODULE, | ||
156 | .pm = &wm831x_spi_pm, | ||
157 | }, | ||
158 | .probe = wm831x_spi_probe, | ||
159 | .remove = __devexit_p(wm831x_spi_remove), | ||
160 | }; | ||
161 | |||
162 | static struct spi_driver wm8320_spi_driver = { | ||
163 | .driver = { | ||
164 | .name = "wm8320", | ||
165 | .bus = &spi_bus_type, | ||
166 | .owner = THIS_MODULE, | ||
167 | .pm = &wm831x_spi_pm, | ||
168 | }, | ||
169 | .probe = wm831x_spi_probe, | ||
170 | .remove = __devexit_p(wm831x_spi_remove), | ||
171 | }; | ||
172 | |||
173 | static struct spi_driver wm8321_spi_driver = { | ||
174 | .driver = { | ||
175 | .name = "wm8321", | ||
176 | .bus = &spi_bus_type, | ||
177 | .owner = THIS_MODULE, | ||
178 | .pm = &wm831x_spi_pm, | ||
179 | }, | ||
180 | .probe = wm831x_spi_probe, | ||
181 | .remove = __devexit_p(wm831x_spi_remove), | ||
182 | }; | ||
183 | |||
184 | static struct spi_driver wm8325_spi_driver = { | ||
185 | .driver = { | ||
186 | .name = "wm8325", | ||
187 | .bus = &spi_bus_type, | ||
188 | .owner = THIS_MODULE, | ||
189 | .pm = &wm831x_spi_pm, | ||
190 | }, | ||
191 | .probe = wm831x_spi_probe, | ||
192 | .remove = __devexit_p(wm831x_spi_remove), | ||
193 | }; | ||
194 | |||
195 | static struct spi_driver wm8326_spi_driver = { | ||
196 | .driver = { | ||
197 | .name = "wm8326", | ||
198 | .bus = &spi_bus_type, | ||
199 | .owner = THIS_MODULE, | ||
200 | .pm = &wm831x_spi_pm, | ||
201 | }, | ||
202 | .probe = wm831x_spi_probe, | ||
203 | .remove = __devexit_p(wm831x_spi_remove), | ||
204 | }; | ||
205 | |||
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 | |||
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 | |||
238 | return 0; | ||
239 | } | ||
240 | subsys_initcall(wm831x_spi_init); | ||
241 | |||
242 | static void __exit wm831x_spi_exit(void) | ||
243 | { | ||
244 | spi_unregister_driver(&wm8326_spi_driver); | ||
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"); | ||