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254 lines
6.3 KiB
254 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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* Copyright (C) 2009 Daniel Ribeiro <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/string.h> |
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#include <linux/slab.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 = to_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 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 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 const 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 = pcap_ts_remove, |
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.driver = { |
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.name = "pcap-ts", |
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.pm = PCAP_TS_PM_OPS, |
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}, |
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}; |
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module_platform_driver(pcap_ts_driver); |
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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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