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