linux-stable/drivers/input/touchscreen/s3c2410_ts.c
Arnd Bergmann 7dbad03ebc ARM: s3c: adc: move header to linux/soc/samsung
There are multiple drivers using the private adc interface.
It seems unlikely that they would ever get converted to iio,
so make the current state official by making the header file
global.

The s3c2410_ts driver needs a couple of register definitions
as well.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Link: https://lore.kernel.org/r/20200806182059.2431-22-krzk@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
2020-08-19 21:44:11 +02:00

464 lines
11 KiB
C

// 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");