![JJ Ding](/assets/img/avatar_default.png)
Commit 940ab88962
introduced a new macro to
save some platform_driver boilerplate code. Use it.
Signed-off-by: JJ Ding <dgdunix@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
442 lines
11 KiB
C
442 lines
11 KiB
C
/*
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* Samsung S3C24XX touchscreen driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the term of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
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* Copyright 2008 Ben Dooks <ben-linux@fluff.org>
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* Copyright 2009 Simtec Electronics <linux@simtec.co.uk>
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*
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* Additional work by Herbert Pƶtzl <herbert@13thfloor.at> and
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* Harald Welte <laforge@openmoko.org>
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/input.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <plat/adc.h>
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#include <plat/regs-adc.h>
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#include <plat/ts.h>
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#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
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#define INT_DOWN (0)
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#define INT_UP (1 << 8)
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#define WAIT4INT (S3C2410_ADCTSC_YM_SEN | \
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S3C2410_ADCTSC_YP_SEN | \
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S3C2410_ADCTSC_XP_SEN | \
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S3C2410_ADCTSC_XY_PST(3))
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#define AUTOPST (S3C2410_ADCTSC_YM_SEN | \
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S3C2410_ADCTSC_YP_SEN | \
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S3C2410_ADCTSC_XP_SEN | \
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S3C2410_ADCTSC_AUTO_PST | \
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S3C2410_ADCTSC_XY_PST(0))
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#define FEAT_PEN_IRQ (1 << 0) /* HAS ADCCLRINTPNDNUP */
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/* Per-touchscreen data. */
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/**
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* struct s3c2410ts - driver touchscreen state.
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* @client: The ADC client we registered with the core driver.
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* @dev: The device we are bound to.
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* @input: The input device we registered with the input subsystem.
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* @clock: The clock for the adc.
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* @io: Pointer to the IO base.
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* @xp: The accumulated X position data.
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* @yp: The accumulated Y position data.
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* @irq_tc: The interrupt number for pen up/down interrupt
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* @count: The number of samples collected.
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* @shift: The log2 of the maximum count to read in one go.
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* @features: The features supported by the TSADC MOdule.
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*/
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struct s3c2410ts {
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struct s3c_adc_client *client;
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struct device *dev;
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struct input_dev *input;
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struct clk *clock;
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void __iomem *io;
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unsigned long xp;
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unsigned long yp;
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int irq_tc;
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int count;
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int shift;
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int features;
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};
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static struct s3c2410ts ts;
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/**
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* get_down - return the down state of the pen
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* @data0: The data read from ADCDAT0 register.
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* @data1: The data read from ADCDAT1 register.
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*
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* Return non-zero if both readings show that the pen is down.
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*/
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static inline bool get_down(unsigned long data0, unsigned long data1)
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{
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/* returns true if both data values show stylus down */
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return (!(data0 & S3C2410_ADCDAT0_UPDOWN) &&
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!(data1 & S3C2410_ADCDAT0_UPDOWN));
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}
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static void touch_timer_fire(unsigned long data)
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{
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unsigned long data0;
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unsigned long data1;
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bool down;
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data0 = readl(ts.io + S3C2410_ADCDAT0);
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data1 = readl(ts.io + S3C2410_ADCDAT1);
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down = get_down(data0, data1);
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if (down) {
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if (ts.count == (1 << ts.shift)) {
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ts.xp >>= ts.shift;
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ts.yp >>= ts.shift;
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dev_dbg(ts.dev, "%s: X=%lu, Y=%lu, count=%d\n",
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__func__, ts.xp, ts.yp, ts.count);
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input_report_abs(ts.input, ABS_X, ts.xp);
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input_report_abs(ts.input, ABS_Y, ts.yp);
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input_report_key(ts.input, BTN_TOUCH, 1);
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input_sync(ts.input);
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ts.xp = 0;
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ts.yp = 0;
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ts.count = 0;
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}
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s3c_adc_start(ts.client, 0, 1 << ts.shift);
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} else {
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ts.xp = 0;
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ts.yp = 0;
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ts.count = 0;
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input_report_key(ts.input, BTN_TOUCH, 0);
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input_sync(ts.input);
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writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
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}
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}
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static DEFINE_TIMER(touch_timer, touch_timer_fire, 0, 0);
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/**
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* stylus_irq - touchscreen stylus event interrupt
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* @irq: The interrupt number
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* @dev_id: The device ID.
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*
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* Called when the IRQ_TC is fired for a pen up or down event.
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*/
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static irqreturn_t stylus_irq(int irq, void *dev_id)
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{
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unsigned long data0;
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unsigned long data1;
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bool down;
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data0 = readl(ts.io + S3C2410_ADCDAT0);
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data1 = readl(ts.io + S3C2410_ADCDAT1);
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down = get_down(data0, data1);
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/* TODO we should never get an interrupt with down set while
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* the timer is running, but maybe we ought to verify that the
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* timer isn't running anyways. */
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if (down)
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s3c_adc_start(ts.client, 0, 1 << ts.shift);
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else
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dev_dbg(ts.dev, "%s: count=%d\n", __func__, ts.count);
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if (ts.features & FEAT_PEN_IRQ) {
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/* Clear pen down/up interrupt */
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writel(0x0, ts.io + S3C64XX_ADCCLRINTPNDNUP);
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}
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return IRQ_HANDLED;
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}
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/**
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* s3c24xx_ts_conversion - ADC conversion callback
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* @client: The client that was registered with the ADC core.
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* @data0: The reading from ADCDAT0.
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* @data1: The reading from ADCDAT1.
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* @left: The number of samples left.
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*
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* Called when a conversion has finished.
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*/
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static void s3c24xx_ts_conversion(struct s3c_adc_client *client,
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unsigned data0, unsigned data1,
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unsigned *left)
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{
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dev_dbg(ts.dev, "%s: %d,%d\n", __func__, data0, data1);
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ts.xp += data0;
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ts.yp += data1;
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ts.count++;
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/* From tests, it seems that it is unlikely to get a pen-up
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* event during the conversion process which means we can
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* ignore any pen-up events with less than the requisite
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* count done.
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*
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* In several thousand conversions, no pen-ups where detected
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* before count completed.
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*/
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}
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/**
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* s3c24xx_ts_select - ADC selection callback.
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* @client: The client that was registered with the ADC core.
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* @select: The reason for select.
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*
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* Called when the ADC core selects (or deslects) us as a client.
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*/
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static void s3c24xx_ts_select(struct s3c_adc_client *client, unsigned select)
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{
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if (select) {
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writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
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ts.io + S3C2410_ADCTSC);
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} else {
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mod_timer(&touch_timer, jiffies+1);
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writel(WAIT4INT | INT_UP, ts.io + S3C2410_ADCTSC);
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}
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}
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/**
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* s3c2410ts_probe - device core probe entry point
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* @pdev: The device we are being bound to.
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*
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* Initialise, find and allocate any resources we need to run and then
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* register with the ADC and input systems.
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*/
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static int __devinit s3c2410ts_probe(struct platform_device *pdev)
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{
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struct s3c2410_ts_mach_info *info;
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struct device *dev = &pdev->dev;
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struct input_dev *input_dev;
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struct resource *res;
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int ret = -EINVAL;
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/* Initialise input stuff */
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memset(&ts, 0, sizeof(struct s3c2410ts));
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ts.dev = dev;
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info = pdev->dev.platform_data;
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if (!info) {
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dev_err(dev, "no platform data, cannot attach\n");
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return -EINVAL;
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}
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dev_dbg(dev, "initialising touchscreen\n");
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ts.clock = clk_get(dev, "adc");
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if (IS_ERR(ts.clock)) {
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dev_err(dev, "cannot get adc clock source\n");
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return -ENOENT;
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}
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clk_enable(ts.clock);
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dev_dbg(dev, "got and enabled clocks\n");
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ts.irq_tc = ret = platform_get_irq(pdev, 0);
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if (ret < 0) {
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dev_err(dev, "no resource for interrupt\n");
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goto err_clk;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "no resource for registers\n");
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ret = -ENOENT;
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goto err_clk;
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}
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ts.io = ioremap(res->start, resource_size(res));
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if (ts.io == NULL) {
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dev_err(dev, "cannot map registers\n");
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ret = -ENOMEM;
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goto err_clk;
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}
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/* inititalise the gpio */
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if (info->cfg_gpio)
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info->cfg_gpio(to_platform_device(ts.dev));
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ts.client = s3c_adc_register(pdev, s3c24xx_ts_select,
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s3c24xx_ts_conversion, 1);
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if (IS_ERR(ts.client)) {
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dev_err(dev, "failed to register adc client\n");
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ret = PTR_ERR(ts.client);
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goto err_iomap;
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}
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/* Initialise registers */
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if ((info->delay & 0xffff) > 0)
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writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
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writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
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input_dev = input_allocate_device();
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if (!input_dev) {
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dev_err(dev, "Unable to allocate the input device !!\n");
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ret = -ENOMEM;
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goto err_iomap;
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}
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ts.input = input_dev;
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ts.input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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ts.input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(ts.input, ABS_X, 0, 0x3FF, 0, 0);
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input_set_abs_params(ts.input, ABS_Y, 0, 0x3FF, 0, 0);
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ts.input->name = "S3C24XX TouchScreen";
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ts.input->id.bustype = BUS_HOST;
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ts.input->id.vendor = 0xDEAD;
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ts.input->id.product = 0xBEEF;
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ts.input->id.version = 0x0102;
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ts.shift = info->oversampling_shift;
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ts.features = platform_get_device_id(pdev)->driver_data;
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ret = request_irq(ts.irq_tc, stylus_irq, 0,
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"s3c2410_ts_pen", ts.input);
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if (ret) {
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dev_err(dev, "cannot get TC interrupt\n");
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goto err_inputdev;
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}
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dev_info(dev, "driver attached, registering input device\n");
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/* All went ok, so register to the input system */
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ret = input_register_device(ts.input);
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if (ret < 0) {
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dev_err(dev, "failed to register input device\n");
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ret = -EIO;
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goto err_tcirq;
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}
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return 0;
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err_tcirq:
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free_irq(ts.irq_tc, ts.input);
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err_inputdev:
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input_free_device(ts.input);
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err_iomap:
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iounmap(ts.io);
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err_clk:
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del_timer_sync(&touch_timer);
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clk_put(ts.clock);
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return ret;
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}
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/**
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* s3c2410ts_remove - device core removal entry point
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* @pdev: The device we are being removed from.
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*
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* Free up our state ready to be removed.
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*/
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static int __devexit s3c2410ts_remove(struct platform_device *pdev)
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{
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free_irq(ts.irq_tc, ts.input);
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del_timer_sync(&touch_timer);
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clk_disable(ts.clock);
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clk_put(ts.clock);
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input_unregister_device(ts.input);
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iounmap(ts.io);
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return 0;
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}
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#ifdef CONFIG_PM
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static int s3c2410ts_suspend(struct device *dev)
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{
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writel(TSC_SLEEP, ts.io + S3C2410_ADCTSC);
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disable_irq(ts.irq_tc);
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clk_disable(ts.clock);
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return 0;
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}
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static int s3c2410ts_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct s3c2410_ts_mach_info *info = pdev->dev.platform_data;
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clk_enable(ts.clock);
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enable_irq(ts.irq_tc);
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/* Initialise registers */
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if ((info->delay & 0xffff) > 0)
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writel(info->delay & 0xffff, ts.io + S3C2410_ADCDLY);
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writel(WAIT4INT | INT_DOWN, ts.io + S3C2410_ADCTSC);
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return 0;
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}
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static struct dev_pm_ops s3c_ts_pmops = {
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.suspend = s3c2410ts_suspend,
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.resume = s3c2410ts_resume,
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};
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#endif
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static struct platform_device_id s3cts_driver_ids[] = {
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{ "s3c2410-ts", 0 },
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{ "s3c2440-ts", 0 },
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{ "s3c64xx-ts", FEAT_PEN_IRQ },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, s3cts_driver_ids);
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static struct platform_driver s3c_ts_driver = {
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.driver = {
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.name = "samsung-ts",
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM
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.pm = &s3c_ts_pmops,
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#endif
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},
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.id_table = s3cts_driver_ids,
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.probe = s3c2410ts_probe,
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.remove = __devexit_p(s3c2410ts_remove),
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};
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module_platform_driver(s3c_ts_driver);
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MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
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"Ben Dooks <ben@simtec.co.uk>, "
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"Simtec Electronics <linux@simtec.co.uk>");
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MODULE_DESCRIPTION("S3C24XX Touchscreen driver");
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MODULE_LICENSE("GPL v2");
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