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31a62963 BW |
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"); |