Commit | Line | Data |
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4397c98a MF |
1 | /* |
2 | * AD7879/AD7889 touchscreen (SPI bus) | |
3 | * | |
4 | * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. | |
5 | * | |
6 | * Licensed under the GPL-2 or later. | |
7 | */ | |
8 | ||
9 | #include <linux/input.h> /* BUS_SPI */ | |
c7848c8e | 10 | #include <linux/pm.h> |
4397c98a | 11 | #include <linux/spi/spi.h> |
d2d8442d | 12 | #include <linux/module.h> |
fa6e3ca2 | 13 | #include <linux/of.h> |
404a24c3 | 14 | #include <linux/regmap.h> |
4397c98a MF |
15 | |
16 | #include "ad7879.h" | |
17 | ||
18 | #define AD7879_DEVID 0x7A /* AD7879/AD7889 */ | |
19 | ||
20 | #define MAX_SPI_FREQ_HZ 5000000 | |
4397c98a | 21 | |
404a24c3 DT |
22 | #define AD7879_CMD_MAGIC 0xE0 |
23 | #define AD7879_CMD_READ BIT(2) | |
4397c98a | 24 | |
404a24c3 DT |
25 | static const struct regmap_config ad7879_spi_regmap_config = { |
26 | .reg_bits = 16, | |
27 | .val_bits = 16, | |
28 | .max_register = 15, | |
29 | .read_flag_mask = AD7879_CMD_MAGIC | AD7879_CMD_READ, | |
30 | .write_flag_mask = AD7879_CMD_MAGIC, | |
4397c98a MF |
31 | }; |
32 | ||
5298cc4c | 33 | static int ad7879_spi_probe(struct spi_device *spi) |
4397c98a | 34 | { |
404a24c3 | 35 | struct regmap *regmap; |
4397c98a MF |
36 | |
37 | /* don't exceed max specified SPI CLK frequency */ | |
38 | if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { | |
39 | dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz); | |
40 | return -EINVAL; | |
41 | } | |
42 | ||
404a24c3 DT |
43 | regmap = devm_regmap_init_spi(spi, &ad7879_spi_regmap_config); |
44 | if (IS_ERR(regmap)) | |
45 | return PTR_ERR(regmap); | |
46 | ||
4e34025b | 47 | return ad7879_probe(&spi->dev, regmap, spi->irq, BUS_SPI, AD7879_DEVID); |
4397c98a MF |
48 | } |
49 | ||
fa6e3ca2 SA |
50 | #ifdef CONFIG_OF |
51 | static const struct of_device_id ad7879_spi_dt_ids[] = { | |
52 | { .compatible = "adi,ad7879", }, | |
53 | { } | |
54 | }; | |
55 | MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids); | |
56 | #endif | |
57 | ||
4397c98a MF |
58 | static struct spi_driver ad7879_spi_driver = { |
59 | .driver = { | |
60 | .name = "ad7879", | |
8672bd93 | 61 | .pm = &ad7879_pm_ops, |
fa6e3ca2 | 62 | .of_match_table = of_match_ptr(ad7879_spi_dt_ids), |
4397c98a MF |
63 | }, |
64 | .probe = ad7879_spi_probe, | |
4397c98a MF |
65 | }; |
66 | ||
ca83922e | 67 | module_spi_driver(ad7879_spi_driver); |
4397c98a | 68 | |
2581e5d1 | 69 | MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); |
4397c98a MF |
70 | MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver"); |
71 | MODULE_LICENSE("GPL"); | |
72 | MODULE_ALIAS("spi:ad7879"); |