pcmcia: do not use io_req_t after call to pcmcia_request_io()
[linux-2.6.git] / drivers / input / misc / ad714x-spi.c
1 /*
2  * AD714X CapTouch Programmable Controller driver (SPI bus)
3  *
4  * Copyright 2009 Analog Devices Inc.
5  *
6  * Licensed under the GPL-2 or later.
7  */
8
9 #include <linux/input.h>        /* BUS_I2C */
10 #include <linux/module.h>
11 #include <linux/spi/spi.h>
12 #include <linux/types.h>
13 #include "ad714x.h"
14
15 #define AD714x_SPI_CMD_PREFIX      0xE000   /* bits 15:11 */
16 #define AD714x_SPI_READ            BIT(10)
17
18 #ifdef CONFIG_PM
19 static int ad714x_spi_suspend(struct spi_device *spi, pm_message_t message)
20 {
21         return ad714x_disable(spi_get_drvdata(spi));
22 }
23
24 static int ad714x_spi_resume(struct spi_device *spi)
25 {
26         return ad714x_enable(spi_get_drvdata(spi));
27 }
28 #else
29 # define ad714x_spi_suspend NULL
30 # define ad714x_spi_resume  NULL
31 #endif
32
33 static int ad714x_spi_read(struct device *dev, unsigned short reg,
34                 unsigned short *data)
35 {
36         struct spi_device *spi = to_spi_device(dev);
37         unsigned short tx = AD714x_SPI_CMD_PREFIX | AD714x_SPI_READ | reg;
38
39         return spi_write_then_read(spi, (u8 *)&tx, 2, (u8 *)data, 2);
40 }
41
42 static int ad714x_spi_write(struct device *dev, unsigned short reg,
43                 unsigned short data)
44 {
45         struct spi_device *spi = to_spi_device(dev);
46         unsigned short tx[2] = {
47                 AD714x_SPI_CMD_PREFIX | reg,
48                 data
49         };
50
51         return spi_write(spi, (u8 *)tx, 4);
52 }
53
54 static int __devinit ad714x_spi_probe(struct spi_device *spi)
55 {
56         struct ad714x_chip *chip;
57
58         chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
59                             ad714x_spi_read, ad714x_spi_write);
60         if (IS_ERR(chip))
61                 return PTR_ERR(chip);
62
63         spi_set_drvdata(spi, chip);
64
65         return 0;
66 }
67
68 static int __devexit ad714x_spi_remove(struct spi_device *spi)
69 {
70         struct ad714x_chip *chip = spi_get_drvdata(spi);
71
72         ad714x_remove(chip);
73         spi_set_drvdata(spi, NULL);
74
75         return 0;
76 }
77
78 static struct spi_driver ad714x_spi_driver = {
79         .driver = {
80                 .name   = "ad714x_captouch",
81                 .owner  = THIS_MODULE,
82         },
83         .probe          = ad714x_spi_probe,
84         .remove         = __devexit_p(ad714x_spi_remove),
85         .suspend        = ad714x_spi_suspend,
86         .resume         = ad714x_spi_resume,
87 };
88
89 static __init int ad714x_spi_init(void)
90 {
91         return spi_register_driver(&ad714x_spi_driver);
92 }
93 module_init(ad714x_spi_init);
94
95 static __exit void ad714x_spi_exit(void)
96 {
97         spi_unregister_driver(&ad714x_spi_driver);
98 }
99 module_exit(ad714x_spi_exit);
100
101 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
102 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
103 MODULE_LICENSE("GPL");