drivers/input/touchscreen/tsc2005.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * TSC2005 touchscreen driver
   4  *
   5  * Copyright (C) 2006-2010 Nokia Corporation
   6  * Copyright (C) 2015 QWERTY Embedded Design
   7  * Copyright (C) 2015 EMAC Inc.
   8  *
   9  * Based on original tsc2005.c by Lauri Leukkunen <lauri.leukkunen@nokia.com>
  10  */
  11
  12 #include <linux/input.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/regmap.h>
  17 #include "tsc200x-core.h"
  18
  19 static const struct input_id tsc2005_input_id = {
  20         .bustype = BUS_SPI,
  21         .product = 2005,
  22 };
  23
  24 static int tsc2005_cmd(struct device *dev, u8 cmd)
  25 {
  26         u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  27         struct spi_transfer xfer = {
  28                 .tx_buf         = &tx,
  29                 .len            = 1,
  30                 .bits_per_word  = 8,
  31         };
  32         struct spi_message msg;
  33         struct spi_device *spi = to_spi_device(dev);
  34         int error;
  35
  36         spi_message_init(&msg);
  37         spi_message_add_tail(&xfer, &msg);
  38
  39         error = spi_sync(spi, &msg);
  40         if (error) {
  41                 dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
  42                         __func__, cmd, error);
  43                 return error;
  44         }
  45
  46         return 0;
  47 }
  48
  49 static int tsc2005_probe(struct spi_device *spi)
  50 {
  51         int error;
  52
  53         spi->mode = SPI_MODE_0;
  54         spi->bits_per_word = 8;
  55         if (!spi->max_speed_hz)
  56                 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
  57
  58         error = spi_setup(spi);
  59         if (error)
  60                 return error;
  61
  62         return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
  63                              devm_regmap_init_spi(spi, &tsc200x_regmap_config),
  64                              tsc2005_cmd);
  65 }
  66
  67 #ifdef CONFIG_OF
  68 static const struct of_device_id tsc2005_of_match[] = {
  69         { .compatible = "ti,tsc2005" },
  70         { /* sentinel */ }
  71 };
  72 MODULE_DEVICE_TABLE(of, tsc2005_of_match);
  73 #endif
  74
  75 static struct spi_driver tsc2005_driver = {
  76         .driver = {
  77                 .name           = "tsc2005",
  78                 .dev_groups     = tsc200x_groups,
  79                 .of_match_table = of_match_ptr(tsc2005_of_match),
  80                 .pm             = pm_sleep_ptr(&tsc200x_pm_ops),
  81         },
  82         .probe  = tsc2005_probe,
  83 };
  84 module_spi_driver(tsc2005_driver);
  85
  86 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  87 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
  88 MODULE_LICENSE("GPL");
  89 MODULE_ALIAS("spi:tsc2005");