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"); 90