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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
19#ifdef CONFIG_PM_SLEEP
20static int ad714x_spi_suspend(struct device *dev)
21{
22 return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
23}
24
25static int ad714x_spi_resume(struct device *dev)
26{
27 return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
28}
29#endif
30
31static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
32
33static int ad714x_spi_read(struct ad714x_chip *chip,
34 unsigned short reg, unsigned short *data, size_t len)
35{
36 struct spi_device *spi = to_spi_device(chip->dev);
37 struct spi_message message;
38 struct spi_transfer xfer[2];
39 int i;
40 int error;
41
42 spi_message_init(&message);
43 memset(xfer, 0, sizeof(xfer));
44
45 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
46 AD714x_SPI_READ | reg);
47 xfer[0].tx_buf = &chip->xfer_buf[0];
48 xfer[0].len = sizeof(chip->xfer_buf[0]);
49 spi_message_add_tail(&xfer[0], &message);
50
51 xfer[1].rx_buf = &chip->xfer_buf[1];
52 xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
53 spi_message_add_tail(&xfer[1], &message);
54
55 error = spi_sync(spi, &message);
56 if (unlikely(error)) {
57 dev_err(chip->dev, "SPI read error: %d\n", error);
58 return error;
59 }
60
61 for (i = 0; i < len; i++)
62 data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
63
64 return 0;
65}
66
67static int ad714x_spi_write(struct ad714x_chip *chip,
68 unsigned short reg, unsigned short data)
69{
70 struct spi_device *spi = to_spi_device(chip->dev);
71 int error;
72
73 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
74 chip->xfer_buf[1] = cpu_to_be16(data);
75
76 error = spi_write(spi, (u8 *)chip->xfer_buf,
77 2 * sizeof(*chip->xfer_buf));
78 if (unlikely(error)) {
79 dev_err(chip->dev, "SPI write error: %d\n", error);
80 return error;
81 }
82
83 return 0;
84}
85
86static int ad714x_spi_probe(struct spi_device *spi)
87{
88 struct ad714x_chip *chip;
89 int err;
90
91 spi->bits_per_word = 8;
92 err = spi_setup(spi);
93 if (err < 0)
94 return err;
95
96 chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
97 ad714x_spi_read, ad714x_spi_write);
98 if (IS_ERR(chip))
99 return PTR_ERR(chip);
100
101 spi_set_drvdata(spi, chip);
102
103 return 0;
104}
105
106static int ad714x_spi_remove(struct spi_device *spi)
107{
108 struct ad714x_chip *chip = spi_get_drvdata(spi);
109
110 ad714x_remove(chip);
111
112 return 0;
113}
114
115static struct spi_driver ad714x_spi_driver = {
116 .driver = {
117 .name = "ad714x_captouch",
118 .owner = THIS_MODULE,
119 .pm = &ad714x_spi_pm,
120 },
121 .probe = ad714x_spi_probe,
122 .remove = ad714x_spi_remove,
123};
124
125module_spi_driver(ad714x_spi_driver);
126
127MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
128MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
129MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AD714X CapTouch Programmable Controller driver (SPI bus)
4 *
5 * Copyright 2009-2011 Analog Devices Inc.
6 */
7
8#include <linux/input.h> /* BUS_SPI */
9#include <linux/module.h>
10#include <linux/spi/spi.h>
11#include <linux/pm.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
18static int ad714x_spi_read(struct ad714x_chip *chip,
19 unsigned short reg, unsigned short *data, size_t len)
20{
21 struct spi_device *spi = to_spi_device(chip->dev);
22 struct spi_message message;
23 struct spi_transfer xfer[2];
24 int i;
25 int error;
26
27 spi_message_init(&message);
28 memset(xfer, 0, sizeof(xfer));
29
30 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
31 AD714x_SPI_READ | reg);
32 xfer[0].tx_buf = &chip->xfer_buf[0];
33 xfer[0].len = sizeof(chip->xfer_buf[0]);
34 spi_message_add_tail(&xfer[0], &message);
35
36 xfer[1].rx_buf = &chip->xfer_buf[1];
37 xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
38 spi_message_add_tail(&xfer[1], &message);
39
40 error = spi_sync(spi, &message);
41 if (unlikely(error)) {
42 dev_err(chip->dev, "SPI read error: %d\n", error);
43 return error;
44 }
45
46 for (i = 0; i < len; i++)
47 data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
48
49 return 0;
50}
51
52static int ad714x_spi_write(struct ad714x_chip *chip,
53 unsigned short reg, unsigned short data)
54{
55 struct spi_device *spi = to_spi_device(chip->dev);
56 int error;
57
58 chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
59 chip->xfer_buf[1] = cpu_to_be16(data);
60
61 error = spi_write(spi, (u8 *)chip->xfer_buf,
62 2 * sizeof(*chip->xfer_buf));
63 if (unlikely(error)) {
64 dev_err(chip->dev, "SPI write error: %d\n", error);
65 return error;
66 }
67
68 return 0;
69}
70
71static int ad714x_spi_probe(struct spi_device *spi)
72{
73 struct ad714x_chip *chip;
74 int err;
75
76 spi->bits_per_word = 8;
77 err = spi_setup(spi);
78 if (err < 0)
79 return err;
80
81 chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
82 ad714x_spi_read, ad714x_spi_write);
83 if (IS_ERR(chip))
84 return PTR_ERR(chip);
85
86 spi_set_drvdata(spi, chip);
87
88 return 0;
89}
90
91static struct spi_driver ad714x_spi_driver = {
92 .driver = {
93 .name = "ad714x_captouch",
94 .pm = pm_sleep_ptr(&ad714x_pm),
95 },
96 .probe = ad714x_spi_probe,
97};
98
99module_spi_driver(ad714x_spi_driver);
100
101MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
102MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
103MODULE_LICENSE("GPL");