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input: PCAP2 based touchscreen driver
Touchscreen driver for the PCAP2 multi function device used in Motorola EZX smartphones. Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com> Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org> Signed-off-by: Antonio Ospite <ospite@studenti.unina.it> Acked-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Daniel Ribeiro
Samuel Ortiz
parent
e397e7ed50
commit
0387e107d6
@ -510,4 +510,13 @@ config TOUCHSCREEN_W90X900
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To compile this driver as a module, choose M here: the
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module will be called w90p910_ts.
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config TOUCHSCREEN_PCAP
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tristate "Motorola PCAP touchscreen"
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depends on EZX_PCAP
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help
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Say Y here if you have a Motorola EZX telephone and
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want to enable support for the built-in touchscreen.
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To compile this driver as a module, choose M here: the
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module will be called pcap_ts.
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endif
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@ -40,3 +40,4 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
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obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
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obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
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271
drivers/input/touchscreen/pcap_ts.c
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271
drivers/input/touchscreen/pcap_ts.c
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@ -0,0 +1,271 @@
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/*
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* Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform.
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*
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* Copyright (C) 2006 Harald Welte <laforge@openezx.org>
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* Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
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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 terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/pm.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/mfd/ezx-pcap.h>
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struct pcap_ts {
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struct pcap_chip *pcap;
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struct input_dev *input;
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struct delayed_work work;
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u16 x, y;
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u16 pressure;
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u8 read_state;
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};
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#define SAMPLE_DELAY 20 /* msecs */
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#define X_AXIS_MIN 0
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#define X_AXIS_MAX 1023
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#define Y_AXIS_MAX X_AXIS_MAX
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#define Y_AXIS_MIN X_AXIS_MIN
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#define PRESSURE_MAX X_AXIS_MAX
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#define PRESSURE_MIN X_AXIS_MIN
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static void pcap_ts_read_xy(void *data, u16 res[2])
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{
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struct pcap_ts *pcap_ts = data;
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switch (pcap_ts->read_state) {
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case PCAP_ADC_TS_M_PRESSURE:
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/* pressure reading is unreliable */
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if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)
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pcap_ts->pressure = res[0];
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pcap_ts->read_state = PCAP_ADC_TS_M_XY;
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schedule_delayed_work(&pcap_ts->work, 0);
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break;
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case PCAP_ADC_TS_M_XY:
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pcap_ts->y = res[0];
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pcap_ts->x = res[1];
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if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
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pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
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/* pen has been released */
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input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
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input_report_key(pcap_ts->input, BTN_TOUCH, 0);
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pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
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schedule_delayed_work(&pcap_ts->work, 0);
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} else {
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/* pen is touching the screen */
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input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
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input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
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input_report_key(pcap_ts->input, BTN_TOUCH, 1);
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input_report_abs(pcap_ts->input, ABS_PRESSURE,
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pcap_ts->pressure);
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/* switch back to pressure read mode */
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pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
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schedule_delayed_work(&pcap_ts->work,
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msecs_to_jiffies(SAMPLE_DELAY));
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}
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input_sync(pcap_ts->input);
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break;
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default:
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dev_warn(&pcap_ts->input->dev,
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"pcap_ts: Warning, unhandled read_state %d\n",
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pcap_ts->read_state);
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break;
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}
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}
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static void pcap_ts_work(struct work_struct *work)
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{
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struct delayed_work *dw = container_of(work, struct delayed_work, work);
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struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);
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u8 ch[2];
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pcap_set_ts_bits(pcap_ts->pcap,
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pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
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if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)
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return;
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/* start adc conversion */
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ch[0] = PCAP_ADC_CH_TS_X1;
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ch[1] = PCAP_ADC_CH_TS_Y1;
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pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,
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pcap_ts_read_xy, pcap_ts);
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}
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static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
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{
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struct pcap_ts *pcap_ts = data;
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if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
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pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
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schedule_delayed_work(&pcap_ts->work, 0);
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}
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return IRQ_HANDLED;
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}
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static int pcap_ts_open(struct input_dev *dev)
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{
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struct pcap_ts *pcap_ts = input_get_drvdata(dev);
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pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
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schedule_delayed_work(&pcap_ts->work, 0);
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return 0;
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}
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static void pcap_ts_close(struct input_dev *dev)
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{
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struct pcap_ts *pcap_ts = input_get_drvdata(dev);
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cancel_delayed_work_sync(&pcap_ts->work);
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pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
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pcap_set_ts_bits(pcap_ts->pcap,
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pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
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}
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static int __devinit pcap_ts_probe(struct platform_device *pdev)
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{
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struct input_dev *input_dev;
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struct pcap_ts *pcap_ts;
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int err = -ENOMEM;
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pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL);
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if (!pcap_ts)
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return err;
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pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);
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platform_set_drvdata(pdev, pcap_ts);
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input_dev = input_allocate_device();
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if (!input_dev)
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goto fail;
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INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);
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pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
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pcap_set_ts_bits(pcap_ts->pcap,
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pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
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pcap_ts->input = input_dev;
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input_set_drvdata(input_dev, pcap_ts);
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input_dev->name = "pcap-touchscreen";
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input_dev->phys = "pcap_ts/input0";
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input_dev->id.bustype = BUS_HOST;
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input_dev->id.vendor = 0x0001;
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input_dev->id.product = 0x0002;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &pdev->dev;
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input_dev->open = pcap_ts_open;
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input_dev->close = pcap_ts_close;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
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PRESSURE_MAX, 0, 0);
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err = input_register_device(pcap_ts->input);
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if (err)
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goto fail_allocate;
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err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
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pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
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if (err)
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goto fail_register;
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return 0;
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fail_register:
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input_unregister_device(input_dev);
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goto fail;
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fail_allocate:
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input_free_device(input_dev);
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fail:
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kfree(pcap_ts);
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return err;
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}
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static int __devexit pcap_ts_remove(struct platform_device *pdev)
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{
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struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);
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free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);
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cancel_delayed_work_sync(&pcap_ts->work);
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input_unregister_device(pcap_ts->input);
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kfree(pcap_ts);
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return 0;
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}
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#ifdef CONFIG_PM
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static int pcap_ts_suspend(struct device *dev)
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{
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struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
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pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);
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return 0;
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}
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static int pcap_ts_resume(struct device *dev)
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{
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struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
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pcap_set_ts_bits(pcap_ts->pcap,
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pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
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return 0;
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}
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static struct dev_pm_ops pcap_ts_pm_ops = {
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.suspend = pcap_ts_suspend,
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.resume = pcap_ts_resume,
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};
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#define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)
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#else
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#define PCAP_TS_PM_OPS NULL
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#endif
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static struct platform_driver pcap_ts_driver = {
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.probe = pcap_ts_probe,
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.remove = __devexit_p(pcap_ts_remove),
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.driver = {
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.name = "pcap-ts",
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.owner = THIS_MODULE,
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.pm = PCAP_TS_PM_OPS,
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},
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};
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static int __init pcap_ts_init(void)
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{
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return platform_driver_register(&pcap_ts_driver);
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}
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static void __exit pcap_ts_exit(void)
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{
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platform_driver_unregister(&pcap_ts_driver);
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}
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module_init(pcap_ts_init);
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module_exit(pcap_ts_exit);
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MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
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MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pcap_ts");
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