From 51b8a1cd5188f3be325ace49556b7b93ce09d5c7 Mon Sep 17 00:00:00 2001 From: Andrzej Zaborowski Date: Thu, 19 Oct 2006 16:44:13 +0300 Subject: [PATCH] SPI: TSC2102 Touchscreen This a driver for touchscreens connected to the TSC2102 chip. It uses the normal input events framework and can be accessed through /dev/input/eventX. Signed-off-by: Andrzej Zaborowski --- drivers/input/touchscreen/Kconfig | 15 +++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/tsc2102_ts.c | 164 +++++++++++++++++++++++++ 3 files changed, 180 insertions(+) create mode 100644 drivers/input/touchscreen/tsc2102_ts.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 3253906a365..340ce6ad4ac 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -111,6 +111,21 @@ config TOUCHSCREEN_HP600 To compile this driver as a module, choose M here: the module will be called hp680_ts_input. +config TOUCHSCREEN_TSC2102 + tristate "TSC 2102 based touchscreens" + depends on SPI_MASTER + select TSC2102 + help + Say Y here if you have a touchscreen interface using the + TI TSC 2102 controller, and your board-specific initialization + code includes that in its table of SPI devices. Also make + sure the proper SPI controller is selected. + + If unsure, say N (but it's safe to say "Y"). + + To compile this driver as a module, choose M here: the + module will be called tsc2102_ts. + endif config TOUCHSCREEN_OMAP tristate "OMAP touchscreen input driver" diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index b5866f932e2..2cc4512d6f7 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -12,4 +12,5 @@ obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o +obj-$(CONFIG_TOUCHSCREEN_TSC2102) += tsc2102_ts.o obj-$(CONFIG_TOUCHSCREEN_OMAP) += omap/ diff --git a/drivers/input/touchscreen/tsc2102_ts.c b/drivers/input/touchscreen/tsc2102_ts.c new file mode 100644 index 00000000000..81882639c90 --- /dev/null +++ b/drivers/input/touchscreen/tsc2102_ts.c @@ -0,0 +1,164 @@ +/* + * input/touchscreen/tsc2102_ts.c + * + * Touchscreen input device driver for the TSC 2102 chip. + * + * Copyright (c) 2006 Andrzej Zaborowski + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This package is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this package; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include +#include +#include +#include + +#include + +struct input_dev *dev; + +static void tsc2102_touch(int touching) +{ + if (!touching) { + input_report_abs(dev, ABS_X, 0); + input_report_abs(dev, ABS_Y, 0); + input_report_abs(dev, ABS_PRESSURE, 0); + input_sync(dev); + } + + input_report_key(dev, BTN_TOUCH, touching); +} + +static void tsc2102_coords(int x, int y, int z1, int z2) +{ + int p; + + /* Calculate the touch resistance a la equation #1 */ + if (z1 != 0) + p = x * (z2 - z1) / (z1 << 4); + else + p = 1; + + input_report_abs(dev, ABS_X, x); + input_report_abs(dev, ABS_Y, y); + input_report_abs(dev, ABS_PRESSURE, p); + input_sync(dev); +} + +static int tsc2102_ts_probe(struct platform_device *pdev) +{ + int status; + + dev = input_allocate_device(); + if (!dev) + return -ENOMEM; + + status = tsc2102_touch_cb(tsc2102_touch); + if (status) { + input_free_device(dev); + return status; + } + + status = tsc2102_coords_cb(tsc2102_coords); + if (status) { + tsc2102_touch_cb(0); + input_free_device(dev); + return status; + } + + dev->name = "TSC2102 Touchscreen"; + dev->dev = &pdev->dev; + dev->cdev.dev = &pdev->dev; + dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); + dev->keybit[LONG(BTN_TOUCH)] |= BIT(BTN_TOUCH); + dev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE); + dev->phys = "tsc2102/input0"; + dev->id.bustype = BUS_HOST; + dev->id.vendor = 0x0001; + dev->id.product = 0x2102; + dev->id.version = 0x0001; + + status = input_register_device(dev); + if (status) { + tsc2102_coords_cb(0); + tsc2102_touch_cb(0); + input_free_device(dev); + return status; + } + + printk(KERN_INFO "TSC2102 touchscreen driver initialized\n"); + return 0; +} + +static int tsc2102_ts_remove(struct platform_device *pdev) +{ + tsc2102_touch_cb(0); + tsc2102_coords_cb(0); + input_unregister_device(dev); + input_free_device(dev); + return 0; +} + +#ifdef CONFIG_PM +static int +tsc2102_ts_suspend(struct platform_device *pdev, pm_message_t state) +{ + return 0; +} + +static int tsc2102_ts_resume(struct platform_device *pdev) +{ + return 0; +} +#else +#define tsc2102_ts_suspend NULL +#define tsc2102_ts_resume NULL +#endif + +static struct platform_driver tsc2102_ts_driver = { + .probe = tsc2102_ts_probe, + .remove = tsc2102_ts_remove, + .suspend = tsc2102_ts_suspend, + .resume = tsc2102_ts_resume, + .driver = { + .name = "tsc2102-ts", + .owner = THIS_MODULE, + }, +}; + +static int __init tsc2102_ts_init(void) +{ + int ret; + + ret = platform_driver_register(&tsc2102_ts_driver); + if (ret) + return -ENODEV; + + return 0; +} + +static void __exit tsc2102_ts_exit(void) +{ + platform_driver_unregister(&tsc2102_ts_driver); +} + +module_init(tsc2102_ts_init); +module_exit(tsc2102_ts_exit); + +MODULE_AUTHOR("Andrzej Zaborowski"); +MODULE_DESCRIPTION("Touchscreen input driver for TI TSC2102."); +MODULE_LICENSE("GPL"); -- 2.41.1