input: STMPE touch controller support
This one adds a driver for STMPE touchscreen controllers. This driver depends on the stmpexxx mfd core driver. Signed-off-by: Luotao Fu <l.fu@pengutronix.de> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Luotao Fu
Samuel Ortiz
parent
76f1084531
commit
f94add3bd4
3 changed files with 408 additions and 0 deletions
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@ -628,4 +628,14 @@ config TOUCHSCREEN_TPS6507X
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To compile this driver as a module, choose M here: the
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module will be called tps6507x_ts.
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config TOUCHSCREEN_STMPE
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tristate "STMicroelectronics STMPE touchscreens"
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depends on MFD_STMPE
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help
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Say Y here if you want support for STMicroelectronics
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STMPE touchscreen controllers.
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To compile this driver as a module, choose M here: the
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module will be called stmpe-ts.
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endif
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@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
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obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
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obj-$(CONFIG_TOUCHSCREEN_QT602240) += qt602240_ts.o
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obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
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obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHIT213) += touchit213.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
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obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
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397
drivers/input/touchscreen/stmpe-ts.c
Normal file
397
drivers/input/touchscreen/stmpe-ts.c
Normal file
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@ -0,0 +1,397 @@
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/* STMicroelectronics STMPE811 Touchscreen Driver
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*
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* (C) 2010 Luotao Fu <l.fu@pengutronix.de>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/stmpe.h>
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/* Register layouts and functionalities are identical on all stmpexxx variants
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* with touchscreen controller
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*/
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#define STMPE_REG_INT_STA 0x0B
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#define STMPE_REG_ADC_CTRL1 0x20
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#define STMPE_REG_ADC_CTRL2 0x21
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#define STMPE_REG_TSC_CTRL 0x40
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#define STMPE_REG_TSC_CFG 0x41
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#define STMPE_REG_FIFO_TH 0x4A
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#define STMPE_REG_FIFO_STA 0x4B
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#define STMPE_REG_FIFO_SIZE 0x4C
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#define STMPE_REG_TSC_DATA_XYZ 0x52
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#define STMPE_REG_TSC_FRACTION_Z 0x56
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#define STMPE_REG_TSC_I_DRIVE 0x58
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#define OP_MOD_XYZ 0
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#define STMPE_TSC_CTRL_TSC_EN (1<<0)
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#define STMPE_FIFO_STA_RESET (1<<0)
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#define STMPE_IRQ_TOUCH_DET 0
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#define SAMPLE_TIME(x) ((x & 0xf) << 4)
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#define MOD_12B(x) ((x & 0x1) << 3)
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#define REF_SEL(x) ((x & 0x1) << 1)
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#define ADC_FREQ(x) (x & 0x3)
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#define AVE_CTRL(x) ((x & 0x3) << 6)
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#define DET_DELAY(x) ((x & 0x7) << 3)
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#define SETTLING(x) (x & 0x7)
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#define FRACTION_Z(x) (x & 0x7)
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#define I_DRIVE(x) (x & 0x1)
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#define OP_MODE(x) ((x & 0x7) << 1)
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#define STMPE_TS_NAME "stmpe-ts"
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#define XY_MASK 0xfff
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struct stmpe_touch {
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struct stmpe *stmpe;
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struct input_dev *idev;
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struct delayed_work work;
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struct device *dev;
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u8 sample_time;
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u8 mod_12b;
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u8 ref_sel;
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u8 adc_freq;
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u8 ave_ctrl;
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u8 touch_det_delay;
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u8 settling;
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u8 fraction_z;
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u8 i_drive;
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};
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static int __stmpe_reset_fifo(struct stmpe *stmpe)
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{
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int ret;
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ret = stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
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STMPE_FIFO_STA_RESET, STMPE_FIFO_STA_RESET);
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if (ret)
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return ret;
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return stmpe_set_bits(stmpe, STMPE_REG_FIFO_STA,
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STMPE_FIFO_STA_RESET, 0);
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}
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static void stmpe_work(struct work_struct *work)
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{
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int int_sta;
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u32 timeout = 40;
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struct stmpe_touch *ts =
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container_of(work, struct stmpe_touch, work.work);
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int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
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/*
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* touch_det sometimes get desasserted or just get stuck. This appears
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* to be a silicon bug, We still have to clearify this with the
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* manufacture. As a workaround We release the key anyway if the
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* touch_det keeps coming in after 4ms, while the FIFO contains no value
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* during the whole time.
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*/
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while ((int_sta & (1 << STMPE_IRQ_TOUCH_DET)) && (timeout > 0)) {
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timeout--;
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int_sta = stmpe_reg_read(ts->stmpe, STMPE_REG_INT_STA);
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udelay(100);
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}
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/* reset the FIFO before we report release event */
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__stmpe_reset_fifo(ts->stmpe);
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input_report_abs(ts->idev, ABS_PRESSURE, 0);
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input_sync(ts->idev);
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}
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static irqreturn_t stmpe_ts_handler(int irq, void *data)
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{
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u8 data_set[4];
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int x, y, z;
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struct stmpe_touch *ts = data;
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/*
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* Cancel scheduled polling for release if we have new value
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* available. Wait if the polling is already running.
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*/
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cancel_delayed_work_sync(&ts->work);
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/*
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* The FIFO sometimes just crashes and stops generating interrupts. This
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* appears to be a silicon bug. We still have to clearify this with
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* the manufacture. As a workaround we disable the TSC while we are
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* collecting data and flush the FIFO after reading
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*/
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
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STMPE_TSC_CTRL_TSC_EN, 0);
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stmpe_block_read(ts->stmpe, STMPE_REG_TSC_DATA_XYZ, 4, data_set);
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x = (data_set[0] << 4) | (data_set[1] >> 4);
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y = ((data_set[1] & 0xf) << 8) | data_set[2];
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z = data_set[3];
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input_report_abs(ts->idev, ABS_X, x);
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input_report_abs(ts->idev, ABS_Y, y);
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input_report_abs(ts->idev, ABS_PRESSURE, z);
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input_sync(ts->idev);
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/* flush the FIFO after we have read out our values. */
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__stmpe_reset_fifo(ts->stmpe);
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/* reenable the tsc */
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
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STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
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/* start polling for touch_det to detect release */
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schedule_delayed_work(&ts->work, HZ / 50);
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return IRQ_HANDLED;
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}
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static int __devinit stmpe_init_hw(struct stmpe_touch *ts)
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{
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int ret;
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u8 adc_ctrl1, adc_ctrl1_mask, tsc_cfg, tsc_cfg_mask;
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struct stmpe *stmpe = ts->stmpe;
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struct device *dev = ts->dev;
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ret = stmpe_enable(stmpe, STMPE_BLOCK_TOUCHSCREEN | STMPE_BLOCK_ADC);
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if (ret) {
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dev_err(dev, "Could not enable clock for ADC and TS\n");
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return ret;
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}
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adc_ctrl1 = SAMPLE_TIME(ts->sample_time) | MOD_12B(ts->mod_12b) |
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REF_SEL(ts->ref_sel);
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adc_ctrl1_mask = SAMPLE_TIME(0xff) | MOD_12B(0xff) | REF_SEL(0xff);
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ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL1,
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adc_ctrl1_mask, adc_ctrl1);
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if (ret) {
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dev_err(dev, "Could not setup ADC\n");
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return ret;
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}
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ret = stmpe_set_bits(stmpe, STMPE_REG_ADC_CTRL2,
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ADC_FREQ(0xff), ADC_FREQ(ts->adc_freq));
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if (ret) {
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dev_err(dev, "Could not setup ADC\n");
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return ret;
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}
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tsc_cfg = AVE_CTRL(ts->ave_ctrl) | DET_DELAY(ts->touch_det_delay) |
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SETTLING(ts->settling);
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tsc_cfg_mask = AVE_CTRL(0xff) | DET_DELAY(0xff) | SETTLING(0xff);
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CFG, tsc_cfg_mask, tsc_cfg);
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if (ret) {
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dev_err(dev, "Could not config touch\n");
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return ret;
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}
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_FRACTION_Z,
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FRACTION_Z(0xff), FRACTION_Z(ts->fraction_z));
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if (ret) {
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dev_err(dev, "Could not config touch\n");
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return ret;
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}
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_I_DRIVE,
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I_DRIVE(0xff), I_DRIVE(ts->i_drive));
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if (ret) {
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dev_err(dev, "Could not config touch\n");
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return ret;
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}
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/* set FIFO to 1 for single point reading */
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ret = stmpe_reg_write(stmpe, STMPE_REG_FIFO_TH, 1);
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if (ret) {
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dev_err(dev, "Could not set FIFO\n");
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return ret;
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}
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ret = stmpe_set_bits(stmpe, STMPE_REG_TSC_CTRL,
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OP_MODE(0xff), OP_MODE(OP_MOD_XYZ));
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if (ret) {
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dev_err(dev, "Could not set mode\n");
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return ret;
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}
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return 0;
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}
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static int stmpe_ts_open(struct input_dev *dev)
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{
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struct stmpe_touch *ts = input_get_drvdata(dev);
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int ret = 0;
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ret = __stmpe_reset_fifo(ts->stmpe);
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if (ret)
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return ret;
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return stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
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STMPE_TSC_CTRL_TSC_EN, STMPE_TSC_CTRL_TSC_EN);
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}
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static void stmpe_ts_close(struct input_dev *dev)
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{
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struct stmpe_touch *ts = input_get_drvdata(dev);
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cancel_delayed_work_sync(&ts->work);
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stmpe_set_bits(ts->stmpe, STMPE_REG_TSC_CTRL,
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STMPE_TSC_CTRL_TSC_EN, 0);
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}
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static int __devinit stmpe_input_probe(struct platform_device *pdev)
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{
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struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
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struct stmpe_platform_data *pdata = stmpe->pdata;
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struct stmpe_touch *ts;
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struct input_dev *idev;
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struct stmpe_ts_platform_data *ts_pdata = NULL;
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int ret = 0;
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unsigned int ts_irq;
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ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
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if (ts_irq < 0)
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return ts_irq;
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ts = kzalloc(sizeof(*ts), GFP_KERNEL);
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if (!ts)
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goto err_out;
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idev = input_allocate_device();
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if (!idev)
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goto err_free_ts;
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platform_set_drvdata(pdev, ts);
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ts->stmpe = stmpe;
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ts->idev = idev;
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ts->dev = &pdev->dev;
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if (pdata)
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ts_pdata = pdata->ts;
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if (ts_pdata) {
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ts->sample_time = ts_pdata->sample_time;
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ts->mod_12b = ts_pdata->mod_12b;
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ts->ref_sel = ts_pdata->ref_sel;
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ts->adc_freq = ts_pdata->adc_freq;
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ts->ave_ctrl = ts_pdata->ave_ctrl;
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ts->touch_det_delay = ts_pdata->touch_det_delay;
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ts->settling = ts_pdata->settling;
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ts->fraction_z = ts_pdata->fraction_z;
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ts->i_drive = ts_pdata->i_drive;
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}
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INIT_DELAYED_WORK(&ts->work, stmpe_work);
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ret = request_threaded_irq(ts_irq, NULL, stmpe_ts_handler,
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IRQF_ONESHOT, STMPE_TS_NAME, ts);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request IRQ %d\n", ts_irq);
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goto err_free_input;
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}
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ret = stmpe_init_hw(ts);
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if (ret)
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goto err_free_irq;
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idev->name = STMPE_TS_NAME;
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idev->id.bustype = BUS_I2C;
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idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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idev->open = stmpe_ts_open;
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idev->close = stmpe_ts_close;
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input_set_drvdata(idev, ts);
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input_set_abs_params(idev, ABS_X, 0, XY_MASK, 0, 0);
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input_set_abs_params(idev, ABS_Y, 0, XY_MASK, 0, 0);
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input_set_abs_params(idev, ABS_PRESSURE, 0x0, 0xff, 0, 0);
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ret = input_register_device(idev);
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if (ret) {
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dev_err(&pdev->dev, "Could not register input device\n");
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goto err_free_irq;
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}
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return ret;
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err_free_irq:
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free_irq(ts_irq, ts);
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err_free_input:
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input_free_device(idev);
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platform_set_drvdata(pdev, NULL);
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err_free_ts:
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kfree(ts);
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err_out:
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return ret;
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}
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static int __devexit stmpe_ts_remove(struct platform_device *pdev)
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{
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struct stmpe_touch *ts = platform_get_drvdata(pdev);
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unsigned int ts_irq = platform_get_irq_byname(pdev, "FIFO_TH");
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stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
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free_irq(ts_irq, ts);
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platform_set_drvdata(pdev, NULL);
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input_unregister_device(ts->idev);
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input_free_device(ts->idev);
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kfree(ts);
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return 0;
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}
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static struct platform_driver stmpe_ts_driver = {
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.driver = {
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.name = STMPE_TS_NAME,
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.owner = THIS_MODULE,
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},
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.probe = stmpe_input_probe,
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.remove = __devexit_p(stmpe_ts_remove),
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};
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static int __init stmpe_ts_init(void)
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{
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return platform_driver_register(&stmpe_ts_driver);
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}
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module_init(stmpe_ts_init);
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static void __exit stmpe_ts_exit(void)
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{
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platform_driver_unregister(&stmpe_ts_driver);
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}
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module_exit(stmpe_ts_exit);
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MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
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MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" STMPE_TS_NAME);
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