Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * AD714X CapTouch Programmable Controller driver (SPI bus) |
| 3 | * |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 4 | * Copyright 2009-2011 Analog Devices Inc. |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 5 | * |
| 6 | * Licensed under the GPL-2 or later. |
| 7 | */ |
| 8 | |
Michael Hennerich | 6337de2 | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 9 | #include <linux/input.h> /* BUS_SPI */ |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/spi/spi.h> |
Mark Brown | a257090 | 2011-02-11 08:49:37 -0800 | [diff] [blame] | 12 | #include <linux/pm.h> |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | |
Jingoo Han | 97a652a | 2014-11-02 00:02:46 -0700 | [diff] [blame] | 19 | static int __maybe_unused ad714x_spi_suspend(struct device *dev) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 20 | { |
Mark Brown | a257090 | 2011-02-11 08:49:37 -0800 | [diff] [blame] | 21 | return ad714x_disable(spi_get_drvdata(to_spi_device(dev))); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 22 | } |
| 23 | |
Jingoo Han | 97a652a | 2014-11-02 00:02:46 -0700 | [diff] [blame] | 24 | static int __maybe_unused ad714x_spi_resume(struct device *dev) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 25 | { |
Mark Brown | a257090 | 2011-02-11 08:49:37 -0800 | [diff] [blame] | 26 | return ad714x_enable(spi_get_drvdata(to_spi_device(dev))); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 27 | } |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 28 | |
Mark Brown | a257090 | 2011-02-11 08:49:37 -0800 | [diff] [blame] | 29 | static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume); |
| 30 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 31 | static int ad714x_spi_read(struct ad714x_chip *chip, |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 32 | unsigned short reg, unsigned short *data, size_t len) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 33 | { |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 34 | struct spi_device *spi = to_spi_device(chip->dev); |
| 35 | struct spi_message message; |
| 36 | struct spi_transfer xfer[2]; |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 37 | int i; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 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 | |
Michael Hennerich | 6337de2 | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 44 | AD714x_SPI_READ | reg); |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 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); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 48 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 49 | xfer[1].rx_buf = &chip->xfer_buf[1]; |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 50 | xfer[1].len = sizeof(chip->xfer_buf[1]) * len; |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 51 | spi_message_add_tail(&xfer[1], &message); |
Michael Hennerich | 6337de2 | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 52 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 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 | } |
Michael Hennerich | 6337de2 | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 58 | |
Michael Hennerich | 9eff794b7 | 2011-08-22 09:45:42 -0700 | [diff] [blame] | 59 | for (i = 0; i < len; i++) |
| 60 | data[i] = be16_to_cpu(chip->xfer_buf[i + 1]); |
| 61 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 62 | return 0; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 65 | static int ad714x_spi_write(struct ad714x_chip *chip, |
Michael Hennerich | 6337de2 | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 66 | unsigned short reg, unsigned short data) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 67 | { |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 68 | struct spi_device *spi = to_spi_device(chip->dev); |
| 69 | int error; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 70 | |
Dmitry Torokhov | c0409fe | 2011-08-22 09:45:39 -0700 | [diff] [blame] | 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; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 82 | } |
| 83 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 84 | static int ad714x_spi_probe(struct spi_device *spi) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 85 | { |
| 86 | struct ad714x_chip *chip; |
Michael Hennerich | 5b9063b | 2011-08-21 21:04:12 -0700 | [diff] [blame] | 87 | int err; |
| 88 | |
| 89 | spi->bits_per_word = 8; |
| 90 | err = spi_setup(spi); |
| 91 | if (err < 0) |
| 92 | return err; |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 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 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 104 | static int ad714x_spi_remove(struct spi_device *spi) |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 105 | { |
| 106 | struct ad714x_chip *chip = spi_get_drvdata(spi); |
| 107 | |
| 108 | ad714x_remove(chip); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static struct spi_driver ad714x_spi_driver = { |
| 114 | .driver = { |
| 115 | .name = "ad714x_captouch", |
| 116 | .owner = THIS_MODULE, |
Mark Brown | a257090 | 2011-02-11 08:49:37 -0800 | [diff] [blame] | 117 | .pm = &ad714x_spi_pm, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 118 | }, |
| 119 | .probe = ad714x_spi_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 120 | .remove = ad714x_spi_remove, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 121 | }; |
| 122 | |
Axel Lin | ca83922 | 2012-03-16 23:05:26 -0700 | [diff] [blame] | 123 | module_spi_driver(ad714x_spi_driver); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 124 | |
| 125 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver"); |
| 126 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| 127 | MODULE_LICENSE("GPL"); |