mfd: Add WM831x SPI support
[linux-2.6.git] / drivers / mfd / wm831x-spi.c
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");