+++ /dev/null
-// 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");
projects / platform / kernel / linux-rpi.git / commitdiff