| /* |
| * Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform. |
| * |
| * Copyright (C) 2006 Harald Welte <laforge@openezx.org> |
| * Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/pm.h> |
| #include <linux/timer.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/input.h> |
| #include <linux/mfd/ezx-pcap.h> |
| |
| struct pcap_ts { |
| struct pcap_chip *pcap; |
| struct input_dev *input; |
| struct delayed_work work; |
| u16 x, y; |
| u16 pressure; |
| u8 read_state; |
| }; |
| |
| #define SAMPLE_DELAY 20 /* msecs */ |
| |
| #define X_AXIS_MIN 0 |
| #define X_AXIS_MAX 1023 |
| #define Y_AXIS_MAX X_AXIS_MAX |
| #define Y_AXIS_MIN X_AXIS_MIN |
| #define PRESSURE_MAX X_AXIS_MAX |
| #define PRESSURE_MIN X_AXIS_MIN |
| |
| static void pcap_ts_read_xy(void *data, u16 res[2]) |
| { |
| struct pcap_ts *pcap_ts = data; |
| |
| switch (pcap_ts->read_state) { |
| case PCAP_ADC_TS_M_PRESSURE: |
| /* pressure reading is unreliable */ |
| if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX) |
| pcap_ts->pressure = res[0]; |
| pcap_ts->read_state = PCAP_ADC_TS_M_XY; |
| schedule_delayed_work(&pcap_ts->work, 0); |
| break; |
| case PCAP_ADC_TS_M_XY: |
| pcap_ts->y = res[0]; |
| pcap_ts->x = res[1]; |
| if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX || |
| pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) { |
| /* pen has been released */ |
| input_report_abs(pcap_ts->input, ABS_PRESSURE, 0); |
| input_report_key(pcap_ts->input, BTN_TOUCH, 0); |
| |
| pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY; |
| schedule_delayed_work(&pcap_ts->work, 0); |
| } else { |
| /* pen is touching the screen */ |
| input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x); |
| input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y); |
| input_report_key(pcap_ts->input, BTN_TOUCH, 1); |
| input_report_abs(pcap_ts->input, ABS_PRESSURE, |
| pcap_ts->pressure); |
| |
| /* switch back to pressure read mode */ |
| pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE; |
| schedule_delayed_work(&pcap_ts->work, |
| msecs_to_jiffies(SAMPLE_DELAY)); |
| } |
| input_sync(pcap_ts->input); |
| break; |
| default: |
| dev_warn(&pcap_ts->input->dev, |
| "pcap_ts: Warning, unhandled read_state %d\n", |
| pcap_ts->read_state); |
| break; |
| } |
| } |
| |
| static void pcap_ts_work(struct work_struct *work) |
| { |
| struct delayed_work *dw = container_of(work, struct delayed_work, work); |
| struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work); |
| u8 ch[2]; |
| |
| pcap_set_ts_bits(pcap_ts->pcap, |
| pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); |
| |
| if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) |
| return; |
| |
| /* start adc conversion */ |
| ch[0] = PCAP_ADC_CH_TS_X1; |
| ch[1] = PCAP_ADC_CH_TS_Y1; |
| pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch, |
| pcap_ts_read_xy, pcap_ts); |
| } |
| |
| static irqreturn_t pcap_ts_event_touch(int pirq, void *data) |
| { |
| struct pcap_ts *pcap_ts = data; |
| |
| if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) { |
| pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE; |
| schedule_delayed_work(&pcap_ts->work, 0); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| static int pcap_ts_open(struct input_dev *dev) |
| { |
| struct pcap_ts *pcap_ts = input_get_drvdata(dev); |
| |
| pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY; |
| schedule_delayed_work(&pcap_ts->work, 0); |
| |
| return 0; |
| } |
| |
| static void pcap_ts_close(struct input_dev *dev) |
| { |
| struct pcap_ts *pcap_ts = input_get_drvdata(dev); |
| |
| cancel_delayed_work_sync(&pcap_ts->work); |
| |
| pcap_ts->read_state = PCAP_ADC_TS_M_NONTS; |
| pcap_set_ts_bits(pcap_ts->pcap, |
| pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); |
| } |
| |
| static int __devinit pcap_ts_probe(struct platform_device *pdev) |
| { |
| struct input_dev *input_dev; |
| struct pcap_ts *pcap_ts; |
| int err = -ENOMEM; |
| |
| pcap_ts = kzalloc(sizeof(*pcap_ts), GFP_KERNEL); |
| if (!pcap_ts) |
| return err; |
| |
| pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent); |
| platform_set_drvdata(pdev, pcap_ts); |
| |
| input_dev = input_allocate_device(); |
| if (!input_dev) |
| goto fail; |
| |
| INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work); |
| |
| pcap_ts->read_state = PCAP_ADC_TS_M_NONTS; |
| pcap_set_ts_bits(pcap_ts->pcap, |
| pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); |
| |
| pcap_ts->input = input_dev; |
| input_set_drvdata(input_dev, pcap_ts); |
| |
| input_dev->name = "pcap-touchscreen"; |
| input_dev->phys = "pcap_ts/input0"; |
| input_dev->id.bustype = BUS_HOST; |
| input_dev->id.vendor = 0x0001; |
| input_dev->id.product = 0x0002; |
| input_dev->id.version = 0x0100; |
| input_dev->dev.parent = &pdev->dev; |
| input_dev->open = pcap_ts_open; |
| input_dev->close = pcap_ts_close; |
| |
| input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
| input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0); |
| input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0); |
| input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN, |
| PRESSURE_MAX, 0, 0); |
| |
| err = input_register_device(pcap_ts->input); |
| if (err) |
| goto fail_allocate; |
| |
| err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), |
| pcap_ts_event_touch, 0, "Touch Screen", pcap_ts); |
| if (err) |
| goto fail_register; |
| |
| return 0; |
| |
| fail_register: |
| input_unregister_device(input_dev); |
| goto fail; |
| fail_allocate: |
| input_free_device(input_dev); |
| fail: |
| kfree(pcap_ts); |
| |
| return err; |
| } |
| |
| static int __devexit pcap_ts_remove(struct platform_device *pdev) |
| { |
| struct pcap_ts *pcap_ts = platform_get_drvdata(pdev); |
| |
| free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts); |
| cancel_delayed_work_sync(&pcap_ts->work); |
| |
| input_unregister_device(pcap_ts->input); |
| |
| kfree(pcap_ts); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int pcap_ts_suspend(struct device *dev) |
| { |
| struct pcap_ts *pcap_ts = dev_get_drvdata(dev); |
| |
| pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR); |
| return 0; |
| } |
| |
| static int pcap_ts_resume(struct device *dev) |
| { |
| struct pcap_ts *pcap_ts = dev_get_drvdata(dev); |
| |
| pcap_set_ts_bits(pcap_ts->pcap, |
| pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT); |
| return 0; |
| } |
| |
| static const struct dev_pm_ops pcap_ts_pm_ops = { |
| .suspend = pcap_ts_suspend, |
| .resume = pcap_ts_resume, |
| }; |
| #define PCAP_TS_PM_OPS (&pcap_ts_pm_ops) |
| #else |
| #define PCAP_TS_PM_OPS NULL |
| #endif |
| |
| static struct platform_driver pcap_ts_driver = { |
| .probe = pcap_ts_probe, |
| .remove = __devexit_p(pcap_ts_remove), |
| .driver = { |
| .name = "pcap-ts", |
| .owner = THIS_MODULE, |
| .pm = PCAP_TS_PM_OPS, |
| }, |
| }; |
| module_platform_driver(pcap_ts_driver); |
| |
| MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver"); |
| MODULE_AUTHOR("Daniel Ribeiro / Harald Welte"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:pcap_ts"); |