diff options
Diffstat (limited to 'drivers/input/touchscreen/s3c2410_ts.c')
| -rw-r--r-- | drivers/input/touchscreen/s3c2410_ts.c | 464 |
1 files changed, 0 insertions, 464 deletions
diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c deleted file mode 100644 index 2e70c0b79444..000000000000 --- a/drivers/input/touchscreen/s3c2410_ts.c +++ /dev/null @@ -1,464 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Samsung S3C24XX touchscreen driver - * - * Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org> - * Copyright 2008 Ben Dooks <ben-linux@fluff.org> - * Copyright 2009 Simtec Electronics <linux@simtec.co.uk> - * - * Additional work by Herbert Pötzl <herbert@13thfloor.at> and - * Harald Welte <laforge@openmoko.org> - */ - -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/input.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/clk.h> -#include <linux/io.h> - -#include <linux/soc/samsung/s3c-adc.h> -#include <linux/platform_data/touchscreen-s3c2410.h> - -#define S3C2410_ADCCON (0x00) -#define S3C2410_ADCTSC (0x04) -#define S3C2410_ADCDLY (0x08) -#define S3C2410_ADCDAT0 (0x0C) -#define S3C2410_ADCDAT1 (0x10) -#define S3C64XX_ADCUPDN (0x14) -#define S3C2443_ADCMUX (0x18) -#define S3C64XX_ADCCLRINT (0x18) -#define S5P_ADCMUX (0x1C) -#define S3C64XX_ADCCLRINTPNDNUP (0x20) - -/* ADCTSC Register Bits */ -#define S3C2443_ADCTSC_UD_SEN (1 << 8) -#define S3C2410_ADCTSC_YM_SEN (1<<7) -#define S3C2410_ADCTSC_YP_SEN (1<<6) -#define S3C2410_ADCTSC_XM_SEN (1<<5) -#define S3C2410_ADCTSC_XP_SEN (1<<4) -#define S3C2410_ADCTSC_PULL_UP_DISABLE (1<<3) -#define S3C2410_ADCTSC_AUTO_PST (1<<2) -#define S3C2410_ADCTSC_XY_PST(x) (((x)&0x3)<<0) - -/* ADCDAT0 Bits */ -#define S3C2410_ADCDAT0_UPDOWN (1<<15) -#define S3C2410_ADCDAT0_AUTO_PST (1<<14) -#define S3C2410_ADCDAT0_XY_PST (0x3<<12) -#define S3C2410_ADCDAT0_XPDATA_MASK (0x03FF) - -/* ADCDAT1 Bits */ -#define S3C2410_ADCDAT1_UPDOWN (1<<15) -#define S3C2410_ADCDAT1_AUTO_PST (1<<14) -#define S3C2410_ADCDAT1_XY_PST (0x3<<12) -#define S3C2410_ADCDAT1_YPDATA_MASK (0x03FF) - - -#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0)) - -#define INT_DOWN (0) -#define INT_UP (1 << 8) - -#define WAIT4INT (S3C2410_ADCTSC_YM_SEN | \ - S3C2410_ADCTSC_YP_SEN | \ - S3C2410_ADCTSC_XP_SEN | \ - S3C2410_ADCTSC_XY_PST(3)) - -#define AUTOPST (S3C2410_ADCTSC_YM_SEN | \ - S3C2410_ADCTSC_YP_SEN | \ - S3C2410_ADCTSC_XP_SEN | \ - S3C2410_ADCTSC_AUTO_PST | \ - S3C2410_ADCTSC_XY_PST(0)) - -#define FEAT_PEN_IRQ (1 << 0) /* HAS ADCCLRINTPNDNUP */ - -/* Per-touchscreen data. */ - -/** - * struct s3c2410ts - driver touchscreen state. - * @client: The ADC client we registered with the core driver. - * @dev: The device we are bound to. - * @input: The input device we registered with the input subsystem. - * @clock: The clock for the adc. - * @io: Pointer to the IO base. - * @xp: The accumulated X position data. - * @yp: The accumulated Y position data. - * @irq_tc: The interrupt number for pen up/down interrupt - * @count: The number of samples collected. - * @shift: The log2 of the maximum count to read in one go. - * @features: The features supported by the TSADC MOdule. - */ -struct s3c2410ts { - struct s3c_adc_client *client; - struct device *dev; - struct input_dev *input; - struct clk *clock; - void __iomem *io; - unsigned long xp; - unsigned long yp; - int irq_tc; - int count; - int shift; - int features; -}; - -static struct s3c2410ts ts; - -/** - * get_down - return the down state of the pen - * @data0: The data read from ADCDAT0 register. - * @data1: The data read from ADCDAT1 register. - * - * Return non-zero if both readings show that the pen is down. - */ -static inline bool get_down(unsigned long data0, unsigned long data1) -{ - /* returns true if both data values show stylus down */ - return (!(data0 & S3C2410_ADCDAT0_UPDOWN) && - !(data1 & S3C2410_ADCDAT0_UPDOWN)); -} - -static void touch_timer_fire(struct timer_list *unused) -{ - unsigned long data0; - unsigned long data1; - bool down; - - data0 = readl(ts.io + S3C2410_ADCDAT0); - data1 = readl(ts.io + S3C2410_ADCDAT1); - - down = get_down(data0, data1); - - if (down) { - if (ts.count == (1 << ts.shift)) { - ts.xp >>= ts.shift; - ts.yp >>= ts.shift; - - dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n", - __func__, ts.xp, ts.yp, ts.count); - - input_report_abs(ts.input, ABS_X, ts.xp); - input_report_abs(ts.input, ABS_Y, ts.yp); - - input_report_key(ts.input, BTN_TOUCH, 1); - input_sync(ts.input); - - ts.xp = 0; - ts.yp = 0; - ts.count = 0; - } - - s3c_adc_start(ts.client, 0, 1 << ts.shift); - } else { - ts.xp = 0; - ts.yp = 0; - ts.count = 0; - - input_report_key(ts.input, BTN_TOUCH, 0); - input_sync(ts.input); - - writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); - } -} - -static DEFINE_TIMER(touch_timer, touch_timer_fire); - -/** - * stylus_irq - touchscreen stylus event interrupt - * @irq: The interrupt number - * @dev_id: The device ID. - * - * Called when the IRQ_TC is fired for a pen up or down event. - */ -static irqreturn_t stylus_irq(int irq, void *dev_id) -{ - unsigned long data0; - unsigned long data1; - bool down; - - data0 = readl(ts.io + S3C2410_ADCDAT0); - data1 = readl(ts.io + S3C2410_ADCDAT1); - - down = get_down(data0, data1); - - /* TODO we should never get an interrupt with down set while - * the timer is running, but maybe we ought to verify that the - * timer isn't running anyways. */ - - if (down) - s3c_adc_start(ts.client, 0, 1 << ts.shift); - else - dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count); - - if (ts.features & FEAT_PEN_IRQ) { - /* Clear pen down/up interrupt */ - writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP); - } - - return IRQ_HANDLED; -} - -/** - * s3c24xx_ts_conversion - ADC conversion callback - * @client: The client that was registered with the ADC core. - * @data0: The reading from ADCDAT0. - * @data1: The reading from ADCDAT1. - * @left: The number of samples left. - * - * Called when a conversion has finished. - */ -static void s3c24xx_ts_conversion(struct s3c_adc_client *client, - unsigned data0, unsigned data1, - unsigned *left) -{ - dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1); - - ts.xp += data0; - ts.yp += data1; - - ts.count++; - - /* From tests, it seems that it is unlikely to get a pen-up - * event during the conversion process which means we can - * ignore any pen-up events with less than the requisite - * count done. - * - * In several thousand conversions, no pen-ups where detected - * before count completed. - */ -} - -/** - * s3c24xx_ts_select - ADC selection callback. - * @client: The client that was registered with the ADC core. - * @select: The reason for select. - * - * Called when the ADC core selects (or deslects) us as a client. - */ -static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select) -{ - if (select) { - writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST, - ts.io + S3C2410_ADCTSC); - } else { - mod_timer(&touch_timer, jiffies+1); - writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC); - } -} - -/** - * s3c2410ts_probe - device core probe entry point - * @pdev: The device we are being bound to. - * - * Initialise, find and allocate any resources we need to run and then - * register with the ADC and input systems. - */ -static int s3c2410ts_probe(struct platform_device *pdev) -{ - struct s3c2410_ts_mach_info *info; - struct device *dev = &pdev->dev; - struct input_dev *input_dev; - struct resource *res; - int ret = -EINVAL; - - /* Initialise input stuff */ - memset(&ts, 0, sizeof(struct s3c2410ts)); - - ts.dev = dev; - - info = dev_get_platdata(dev); - if (!info) { - dev_err(dev, "no platform data, cannot attach\n"); - return -EINVAL; - } - - dev_dbg(dev, "initialising touchscreen\n"); - - ts.clock = clk_get(dev, "adc"); - if (IS_ERR(ts.clock)) { - dev_err(dev, "cannot get adc clock source\n"); - return -ENOENT; - } - - ret = clk_prepare_enable(ts.clock); - if (ret) { - dev_err(dev, "Failed! to enabled clocks\n"); - goto err_clk_get; - } - dev_dbg(dev, "got and enabled clocks\n"); - - ts.irq_tc = ret = platform_get_irq(pdev, 0); - if (ret < 0) { - dev_err(dev, "no resource for interrupt\n"); - goto err_clk; - } - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!res) { - dev_err(dev, "no resource for registers\n"); - ret = -ENOENT; - goto err_clk; - } - - ts.io = ioremap(res->start, resource_size(res)); - if (ts.io == NULL) { - dev_err(dev, "cannot map registers\n"); - ret = -ENOMEM; - goto err_clk; - } - - /* inititalise the gpio */ - if (info->cfg_gpio) - info->cfg_gpio(to_platform_device(ts.dev)); - - ts.client = s3c_adc_register(pdev, s3c24xx_ts_select, - s3c24xx_ts_conversion, 1); - if (IS_ERR(ts.client)) { - dev_err(dev, "failed to register adc client\n"); - ret = PTR_ERR(ts.client); - goto err_iomap; - } - - /* Initialise registers */ - if ((info->delay & 0xffff) > 0) - writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY); - - writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); - - input_dev = input_allocate_device(); - if (!input_dev) { - dev_err(dev, "Unable to allocate the input device !!\n"); - ret = -ENOMEM; - goto err_iomap; - } - - ts.input = input_dev; - ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); - ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); - input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0); - input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0); - - ts.input->name = "S3C24XX TouchScreen"; - ts.input->id.bustype = BUS_HOST; - ts.input->id.vendor = 0xDEAD; - ts.input->id.product = 0xBEEF; - ts.input->id.version = 0x0102; - - ts.shift = info->oversampling_shift; - ts.features = platform_get_device_id(pdev)->driver_data; - - ret = request_irq(ts.irq_tc, stylus_irq, 0, - "s3c2410_ts_pen", ts.input); - if (ret) { - dev_err(dev, "cannot get TC interrupt\n"); - goto err_inputdev; - } - - dev_info(dev, "driver attached, registering input device\n"); - - /* All went ok, so register to the input system */ - ret = input_register_device(ts.input); - if (ret < 0) { - dev_err(dev, "failed to register input device\n"); - ret = -EIO; - goto err_tcirq; - } - - return 0; - - err_tcirq: - free_irq(ts.irq_tc, ts.input); - err_inputdev: - input_free_device(ts.input); - err_iomap: - iounmap(ts.io); - err_clk: - clk_disable_unprepare(ts.clock); - del_timer_sync(&touch_timer); - err_clk_get: - clk_put(ts.clock); - return ret; -} - -/** - * s3c2410ts_remove - device core removal entry point - * @pdev: The device we are being removed from. - * - * Free up our state ready to be removed. - */ -static int s3c2410ts_remove(struct platform_device *pdev) -{ - free_irq(ts.irq_tc, ts.input); - del_timer_sync(&touch_timer); - - clk_disable_unprepare(ts.clock); - clk_put(ts.clock); - - input_unregister_device(ts.input); - iounmap(ts.io); - - return 0; -} - -#ifdef CONFIG_PM -static int s3c2410ts_suspend(struct device *dev) -{ - writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC); - disable_irq(ts.irq_tc); - clk_disable(ts.clock); - - return 0; -} - -static int s3c2410ts_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct s3c2410_ts_mach_info *info = dev_get_platdata(&pdev->dev); - - clk_enable(ts.clock); - enable_irq(ts.irq_tc); - - /* Initialise registers */ - if ((info->delay & 0xffff) > 0) - writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY); - - writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC); - - return 0; -} - -static const struct dev_pm_ops s3c_ts_pmops = { - .suspend = s3c2410ts_suspend, - .resume = s3c2410ts_resume, -}; -#endif - -static const struct platform_device_id s3cts_driver_ids[] = { - { "s3c2410-ts", 0 }, - { "s3c2440-ts", 0 }, - { "s3c64xx-ts", FEAT_PEN_IRQ }, - { } -}; -MODULE_DEVICE_TABLE(platform, s3cts_driver_ids); - -static struct platform_driver s3c_ts_driver = { - .driver = { - .name = "samsung-ts", -#ifdef CONFIG_PM - .pm = &s3c_ts_pmops, -#endif - }, - .id_table = s3cts_driver_ids, - .probe = s3c2410ts_probe, - .remove = s3c2410ts_remove, -}; -module_platform_driver(s3c_ts_driver); - -MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, " - "Ben Dooks <ben@simtec.co.uk>, " - "Simtec Electronics <linux@simtec.co.uk>"); -MODULE_DESCRIPTION("S3C24XX Touchscreen driver"); -MODULE_LICENSE("GPL v2"); |