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1/*
2 * AD714X CapTouch Programmable Controller driver (SPI bus)
3 *
4 * Copyright 2009-2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/input.h> /* BUS_SPI */
10#include <linux/module.h>
11#include <linux/spi/spi.h>
12#include <linux/pm.h>
13#include <linux/types.h>
14#include "ad714x.h"
15
16#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
17#define AD714x_SPI_READ BIT(10)
18
19static int __maybe_unused ad714x_spi_suspend(struct device *dev)
20{
21 return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
22}
23
24static int __maybe_unused ad714x_spi_resume(struct device *dev)
25{
26 return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
27}
28
29static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
30
31static int ad714x_spi_read(struct ad714x_chip *chip,
32 unsigned short reg, unsigned short *data, size_t len)
33{
34 struct spi_device *spi = to_spi_device(chip->dev);
35 struct spi_message message;
36 struct spi_transfer xfer[2];
37 int i;
38 int error;
39
40 spi_message_init(&message);
41 memset(xfer, 0, sizeof(xfer));
42
43 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
44 AD714x_SPI_READ | reg);
45 xfer[0].tx_buf = &chip->xfer_buf[0];
46 xfer[0].len = sizeof(chip->xfer_buf[0]);
47 spi_message_add_tail(&xfer[0], &message);
48
49 xfer[1].rx_buf = &chip->xfer_buf[1];
50 xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
51 spi_message_add_tail(&xfer[1], &message);
52
53 error = spi_sync(spi, &message);
54 if (unlikely(error)) {
55 dev_err(chip->dev, "SPI read error: %d\n", error);
56 return error;
57 }
58
59 for (i = 0; i < len; i++)
60 data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
61
62 return 0;
63}
64
65static int ad714x_spi_write(struct ad714x_chip *chip,
66 unsigned short reg, unsigned short data)
67{
68 struct spi_device *spi = to_spi_device(chip->dev);
69 int error;
70
71 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
72 chip->xfer_buf[1] = cpu_to_be16(data);
73
74 error = spi_write(spi, (u8 *)chip->xfer_buf,
75 2 * sizeof(*chip->xfer_buf));
76 if (unlikely(error)) {
77 dev_err(chip->dev, "SPI write error: %d\n", error);
78 return error;
79 }
80
81 return 0;
82}
83
84static int ad714x_spi_probe(struct spi_device *spi)
85{
86 struct ad714x_chip *chip;
87 int err;
88
89 spi->bits_per_word = 8;
90 err = spi_setup(spi);
91 if (err < 0)
92 return err;
93
94 chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
95 ad714x_spi_read, ad714x_spi_write);
96 if (IS_ERR(chip))
97 return PTR_ERR(chip);
98
99 spi_set_drvdata(spi, chip);
100
101 return 0;
102}
103
104static struct spi_driver ad714x_spi_driver = {
105 .driver = {
106 .name = "ad714x_captouch",
107 .pm = &ad714x_spi_pm,
108 },
109 .probe = ad714x_spi_probe,
110};
111
112module_spi_driver(ad714x_spi_driver);
113
114MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
115MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
116MODULE_LICENSE("GPL");
1/*
2 * AD714X CapTouch Programmable Controller driver (SPI bus)
3 *
4 * Copyright 2009-2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <linux/input.h> /* BUS_SPI */
10#include <linux/module.h>
11#include <linux/spi/spi.h>
12#include <linux/pm.h>
13#include <linux/types.h>
14#include "ad714x.h"
15
16#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
17#define AD714x_SPI_READ BIT(10)
18
19static int __maybe_unused ad714x_spi_suspend(struct device *dev)
20{
21 return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
22}
23
24static int __maybe_unused ad714x_spi_resume(struct device *dev)
25{
26 return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
27}
28
29static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
30
31static int ad714x_spi_read(struct ad714x_chip *chip,
32 unsigned short reg, unsigned short *data, size_t len)
33{
34 struct spi_device *spi = to_spi_device(chip->dev);
35 struct spi_message message;
36 struct spi_transfer xfer[2];
37 int i;
38 int error;
39
40 spi_message_init(&message);
41 memset(xfer, 0, sizeof(xfer));
42
43 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
44 AD714x_SPI_READ | reg);
45 xfer[0].tx_buf = &chip->xfer_buf[0];
46 xfer[0].len = sizeof(chip->xfer_buf[0]);
47 spi_message_add_tail(&xfer[0], &message);
48
49 xfer[1].rx_buf = &chip->xfer_buf[1];
50 xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
51 spi_message_add_tail(&xfer[1], &message);
52
53 error = spi_sync(spi, &message);
54 if (unlikely(error)) {
55 dev_err(chip->dev, "SPI read error: %d\n", error);
56 return error;
57 }
58
59 for (i = 0; i < len; i++)
60 data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
61
62 return 0;
63}
64
65static int ad714x_spi_write(struct ad714x_chip *chip,
66 unsigned short reg, unsigned short data)
67{
68 struct spi_device *spi = to_spi_device(chip->dev);
69 int error;
70
71 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
72 chip->xfer_buf[1] = cpu_to_be16(data);
73
74 error = spi_write(spi, (u8 *)chip->xfer_buf,
75 2 * sizeof(*chip->xfer_buf));
76 if (unlikely(error)) {
77 dev_err(chip->dev, "SPI write error: %d\n", error);
78 return error;
79 }
80
81 return 0;
82}
83
84static int ad714x_spi_probe(struct spi_device *spi)
85{
86 struct ad714x_chip *chip;
87 int err;
88
89 spi->bits_per_word = 8;
90 err = spi_setup(spi);
91 if (err < 0)
92 return err;
93
94 chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
95 ad714x_spi_read, ad714x_spi_write);
96 if (IS_ERR(chip))
97 return PTR_ERR(chip);
98
99 spi_set_drvdata(spi, chip);
100
101 return 0;
102}
103
104static struct spi_driver ad714x_spi_driver = {
105 .driver = {
106 .name = "ad714x_captouch",
107 .pm = &ad714x_spi_pm,
108 },
109 .probe = ad714x_spi_probe,
110};
111
112module_spi_driver(ad714x_spi_driver);
113
114MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
115MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
116MODULE_LICENSE("GPL");