2 * wm831x-spi.c -- SPI access for Wolfson WM831x PMICs
4 * Copyright 2009,2010 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/spi/spi.h>
19 #include <linux/mfd/wm831x/core.h>
21 static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
22 int bytes, void *dest)
28 /* Go register at a time */
29 for (r = reg; r < reg + (bytes / 2); r++) {
32 ret = spi_write_then_read(wm831x->control_data,
33 (u8 *)&tx_val, 2, (u8 *)d, 2);
45 static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
48 struct spi_device *spi = wm831x->control_data;
53 /* Go register at a time */
54 for (r = reg; r < reg + (bytes / 2); r++) {
58 ret = spi_write(spi, (char *)&data, sizeof(data));
66 static int __devinit wm831x_spi_probe(struct spi_device *spi)
68 struct wm831x *wm831x;
69 enum wm831x_parent type;
71 /* Currently SPI support for ID tables is unmerged, we're faking it */
72 if (strcmp(spi->modalias, "wm8310") == 0)
74 else if (strcmp(spi->modalias, "wm8311") == 0)
76 else if (strcmp(spi->modalias, "wm8312") == 0)
78 else if (strcmp(spi->modalias, "wm8320") == 0)
80 else if (strcmp(spi->modalias, "wm8321") == 0)
82 else if (strcmp(spi->modalias, "wm8325") == 0)
85 dev_err(&spi->dev, "Unknown device type\n");
89 wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
93 spi->bits_per_word = 16;
94 spi->mode = SPI_MODE_0;
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;
102 return wm831x_device_init(wm831x, type, spi->irq);
105 static int __devexit wm831x_spi_remove(struct spi_device *spi)
107 struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
109 wm831x_device_exit(wm831x);
114 static int wm831x_spi_suspend(struct spi_device *spi, pm_message_t m)
116 struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
118 return wm831x_device_suspend(wm831x);
121 static struct spi_driver wm8310_spi_driver = {
124 .bus = &spi_bus_type,
125 .owner = THIS_MODULE,
127 .probe = wm831x_spi_probe,
128 .remove = __devexit_p(wm831x_spi_remove),
129 .suspend = wm831x_spi_suspend,
132 static struct spi_driver wm8311_spi_driver = {
135 .bus = &spi_bus_type,
136 .owner = THIS_MODULE,
138 .probe = wm831x_spi_probe,
139 .remove = __devexit_p(wm831x_spi_remove),
140 .suspend = wm831x_spi_suspend,
143 static struct spi_driver wm8312_spi_driver = {
146 .bus = &spi_bus_type,
147 .owner = THIS_MODULE,
149 .probe = wm831x_spi_probe,
150 .remove = __devexit_p(wm831x_spi_remove),
151 .suspend = wm831x_spi_suspend,
154 static struct spi_driver wm8320_spi_driver = {
157 .bus = &spi_bus_type,
158 .owner = THIS_MODULE,
160 .probe = wm831x_spi_probe,
161 .remove = __devexit_p(wm831x_spi_remove),
162 .suspend = wm831x_spi_suspend,
165 static struct spi_driver wm8321_spi_driver = {
168 .bus = &spi_bus_type,
169 .owner = THIS_MODULE,
171 .probe = wm831x_spi_probe,
172 .remove = __devexit_p(wm831x_spi_remove),
173 .suspend = wm831x_spi_suspend,
176 static struct spi_driver wm8325_spi_driver = {
179 .bus = &spi_bus_type,
180 .owner = THIS_MODULE,
182 .probe = wm831x_spi_probe,
183 .remove = __devexit_p(wm831x_spi_remove),
184 .suspend = wm831x_spi_suspend,
187 static int __init wm831x_spi_init(void)
191 ret = spi_register_driver(&wm8310_spi_driver);
193 pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
195 ret = spi_register_driver(&wm8311_spi_driver);
197 pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
199 ret = spi_register_driver(&wm8312_spi_driver);
201 pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
203 ret = spi_register_driver(&wm8320_spi_driver);
205 pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
207 ret = spi_register_driver(&wm8321_spi_driver);
209 pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
211 ret = spi_register_driver(&wm8325_spi_driver);
213 pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
217 subsys_initcall(wm831x_spi_init);
219 static void __exit wm831x_spi_exit(void)
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);
228 module_exit(wm831x_spi_exit);
230 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
231 MODULE_LICENSE("GPL");
232 MODULE_AUTHOR("Mark Brown");