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- /*
- * Touchscreen driver for WM831x PMICs
- *
- * Copyright 2011 Wolfson Microelectronics plc.
- * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
- #include <linux/module.h>
- #include <linux/moduleparam.h>
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/pm.h>
- #include <linux/input.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/mfd/wm831x/core.h>
- #include <linux/mfd/wm831x/irq.h>
- #include <linux/mfd/wm831x/pdata.h>
- #include <linux/platform_device.h>
- #include <linux/slab.h>
- #include <linux/types.h>
- /*
- * R16424 (0x4028) - Touch Control 1
- */
- #define WM831X_TCH_ENA 0x8000 /* TCH_ENA */
- #define WM831X_TCH_CVT_ENA 0x4000 /* TCH_CVT_ENA */
- #define WM831X_TCH_SLPENA 0x1000 /* TCH_SLPENA */
- #define WM831X_TCH_Z_ENA 0x0400 /* TCH_Z_ENA */
- #define WM831X_TCH_Y_ENA 0x0200 /* TCH_Y_ENA */
- #define WM831X_TCH_X_ENA 0x0100 /* TCH_X_ENA */
- #define WM831X_TCH_DELAY_MASK 0x00E0 /* TCH_DELAY - [7:5] */
- #define WM831X_TCH_DELAY_SHIFT 5 /* TCH_DELAY - [7:5] */
- #define WM831X_TCH_DELAY_WIDTH 3 /* TCH_DELAY - [7:5] */
- #define WM831X_TCH_RATE_MASK 0x001F /* TCH_RATE - [4:0] */
- #define WM831X_TCH_RATE_SHIFT 0 /* TCH_RATE - [4:0] */
- #define WM831X_TCH_RATE_WIDTH 5 /* TCH_RATE - [4:0] */
- /*
- * R16425 (0x4029) - Touch Control 2
- */
- #define WM831X_TCH_PD_WK 0x2000 /* TCH_PD_WK */
- #define WM831X_TCH_5WIRE 0x1000 /* TCH_5WIRE */
- #define WM831X_TCH_PDONLY 0x0800 /* TCH_PDONLY */
- #define WM831X_TCH_ISEL 0x0100 /* TCH_ISEL */
- #define WM831X_TCH_RPU_MASK 0x000F /* TCH_RPU - [3:0] */
- #define WM831X_TCH_RPU_SHIFT 0 /* TCH_RPU - [3:0] */
- #define WM831X_TCH_RPU_WIDTH 4 /* TCH_RPU - [3:0] */
- /*
- * R16426-8 (0x402A-C) - Touch Data X/Y/X
- */
- #define WM831X_TCH_PD 0x8000 /* TCH_PD1 */
- #define WM831X_TCH_DATA_MASK 0x0FFF /* TCH_DATA - [11:0] */
- #define WM831X_TCH_DATA_SHIFT 0 /* TCH_DATA - [11:0] */
- #define WM831X_TCH_DATA_WIDTH 12 /* TCH_DATA - [11:0] */
- struct wm831x_ts {
- struct input_dev *input_dev;
- struct wm831x *wm831x;
- unsigned int data_irq;
- unsigned int pd_irq;
- bool pressure;
- bool pen_down;
- struct work_struct pd_data_work;
- };
- static void wm831x_pd_data_work(struct work_struct *work)
- {
- struct wm831x_ts *wm831x_ts =
- container_of(work, struct wm831x_ts, pd_data_work);
- if (wm831x_ts->pen_down) {
- enable_irq(wm831x_ts->data_irq);
- dev_dbg(wm831x_ts->wm831x->dev, "IRQ PD->DATA done\n");
- } else {
- enable_irq(wm831x_ts->pd_irq);
- dev_dbg(wm831x_ts->wm831x->dev, "IRQ DATA->PD done\n");
- }
- }
- static irqreturn_t wm831x_ts_data_irq(int irq, void *irq_data)
- {
- struct wm831x_ts *wm831x_ts = irq_data;
- struct wm831x *wm831x = wm831x_ts->wm831x;
- static int data_types[] = { ABS_X, ABS_Y, ABS_PRESSURE };
- u16 data[3];
- int count;
- int i, ret;
- if (wm831x_ts->pressure)
- count = 3;
- else
- count = 2;
- wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
- WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
- ret = wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count,
- data);
- if (ret != 0) {
- dev_err(wm831x->dev, "Failed to read touch data: %d\n",
- ret);
- return IRQ_NONE;
- }
- /*
- * We get a pen down reading on every reading, report pen up if any
- * individual reading does so.
- */
- wm831x_ts->pen_down = true;
- for (i = 0; i < count; i++) {
- if (!(data[i] & WM831X_TCH_PD)) {
- wm831x_ts->pen_down = false;
- continue;
- }
- input_report_abs(wm831x_ts->input_dev, data_types[i],
- data[i] & WM831X_TCH_DATA_MASK);
- }
- if (!wm831x_ts->pen_down) {
- /* Switch from data to pen down */
- dev_dbg(wm831x->dev, "IRQ DATA->PD\n");
- disable_irq_nosync(wm831x_ts->data_irq);
- /* Don't need data any more */
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
- WM831X_TCH_Z_ENA, 0);
- /* Flush any final samples that arrived while reading */
- wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
- WM831X_TCHDATA_EINT, WM831X_TCHDATA_EINT);
- wm831x_bulk_read(wm831x, WM831X_TOUCH_DATA_X, count, data);
- if (wm831x_ts->pressure)
- input_report_abs(wm831x_ts->input_dev,
- ABS_PRESSURE, 0);
- input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 0);
- schedule_work(&wm831x_ts->pd_data_work);
- } else {
- input_report_key(wm831x_ts->input_dev, BTN_TOUCH, 1);
- }
- input_sync(wm831x_ts->input_dev);
- return IRQ_HANDLED;
- }
- static irqreturn_t wm831x_ts_pen_down_irq(int irq, void *irq_data)
- {
- struct wm831x_ts *wm831x_ts = irq_data;
- struct wm831x *wm831x = wm831x_ts->wm831x;
- int ena = 0;
- if (wm831x_ts->pen_down)
- return IRQ_HANDLED;
- disable_irq_nosync(wm831x_ts->pd_irq);
- /* Start collecting data */
- if (wm831x_ts->pressure)
- ena |= WM831X_TCH_Z_ENA;
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA,
- WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA | ena);
- wm831x_set_bits(wm831x, WM831X_INTERRUPT_STATUS_1,
- WM831X_TCHPD_EINT, WM831X_TCHPD_EINT);
- wm831x_ts->pen_down = true;
- /* Switch from pen down to data */
- dev_dbg(wm831x->dev, "IRQ PD->DATA\n");
- schedule_work(&wm831x_ts->pd_data_work);
- return IRQ_HANDLED;
- }
- static int wm831x_ts_input_open(struct input_dev *idev)
- {
- struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
- struct wm831x *wm831x = wm831x_ts->wm831x;
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_ENA | WM831X_TCH_CVT_ENA |
- WM831X_TCH_X_ENA | WM831X_TCH_Y_ENA |
- WM831X_TCH_Z_ENA, WM831X_TCH_ENA);
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_CVT_ENA, WM831X_TCH_CVT_ENA);
- return 0;
- }
- static void wm831x_ts_input_close(struct input_dev *idev)
- {
- struct wm831x_ts *wm831x_ts = input_get_drvdata(idev);
- struct wm831x *wm831x = wm831x_ts->wm831x;
- /* Shut the controller down, disabling all other functionality too */
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_ENA | WM831X_TCH_X_ENA |
- WM831X_TCH_Y_ENA | WM831X_TCH_Z_ENA, 0);
- /* Make sure any pending IRQs are done, the above will prevent
- * new ones firing.
- */
- synchronize_irq(wm831x_ts->data_irq);
- synchronize_irq(wm831x_ts->pd_irq);
- /* Make sure the IRQ completion work is quiesced */
- flush_work(&wm831x_ts->pd_data_work);
- /* If we ended up with the pen down then make sure we revert back
- * to pen detection state for the next time we start up.
- */
- if (wm831x_ts->pen_down) {
- disable_irq(wm831x_ts->data_irq);
- enable_irq(wm831x_ts->pd_irq);
- wm831x_ts->pen_down = false;
- }
- }
- static int wm831x_ts_probe(struct platform_device *pdev)
- {
- struct wm831x_ts *wm831x_ts;
- struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
- struct wm831x_pdata *core_pdata = dev_get_platdata(pdev->dev.parent);
- struct wm831x_touch_pdata *pdata = NULL;
- struct input_dev *input_dev;
- int error, irqf;
- if (core_pdata)
- pdata = core_pdata->touch;
- wm831x_ts = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ts),
- GFP_KERNEL);
- input_dev = devm_input_allocate_device(&pdev->dev);
- if (!wm831x_ts || !input_dev) {
- error = -ENOMEM;
- goto err_alloc;
- }
- wm831x_ts->wm831x = wm831x;
- wm831x_ts->input_dev = input_dev;
- INIT_WORK(&wm831x_ts->pd_data_work, wm831x_pd_data_work);
- /*
- * If we have a direct IRQ use it, otherwise use the interrupt
- * from the WM831x IRQ controller.
- */
- wm831x_ts->data_irq = wm831x_irq(wm831x,
- platform_get_irq_byname(pdev,
- "TCHDATA"));
- if (pdata && pdata->data_irq)
- wm831x_ts->data_irq = pdata->data_irq;
- wm831x_ts->pd_irq = wm831x_irq(wm831x,
- platform_get_irq_byname(pdev, "TCHPD"));
- if (pdata && pdata->pd_irq)
- wm831x_ts->pd_irq = pdata->pd_irq;
- if (pdata)
- wm831x_ts->pressure = pdata->pressure;
- else
- wm831x_ts->pressure = true;
- /* Five wire touchscreens can't report pressure */
- if (pdata && pdata->fivewire) {
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
- WM831X_TCH_5WIRE, WM831X_TCH_5WIRE);
- /* Pressure measurements are not possible for five wire mode */
- WARN_ON(pdata->pressure && pdata->fivewire);
- wm831x_ts->pressure = false;
- } else {
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
- WM831X_TCH_5WIRE, 0);
- }
- if (pdata) {
- switch (pdata->isel) {
- default:
- dev_err(&pdev->dev, "Unsupported ISEL setting: %d\n",
- pdata->isel);
- /* Fall through */
- case 200:
- case 0:
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
- WM831X_TCH_ISEL, 0);
- break;
- case 400:
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
- WM831X_TCH_ISEL, WM831X_TCH_ISEL);
- break;
- }
- }
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_2,
- WM831X_TCH_PDONLY, 0);
- /* Default to 96 samples/sec */
- wm831x_set_bits(wm831x, WM831X_TOUCH_CONTROL_1,
- WM831X_TCH_RATE_MASK, 6);
- if (pdata && pdata->data_irqf)
- irqf = pdata->data_irqf;
- else
- irqf = IRQF_TRIGGER_HIGH;
- error = request_threaded_irq(wm831x_ts->data_irq,
- NULL, wm831x_ts_data_irq,
- irqf | IRQF_ONESHOT,
- "Touchscreen data", wm831x_ts);
- if (error) {
- dev_err(&pdev->dev, "Failed to request data IRQ %d: %d\n",
- wm831x_ts->data_irq, error);
- goto err_alloc;
- }
- disable_irq(wm831x_ts->data_irq);
- if (pdata && pdata->pd_irqf)
- irqf = pdata->pd_irqf;
- else
- irqf = IRQF_TRIGGER_HIGH;
- error = request_threaded_irq(wm831x_ts->pd_irq,
- NULL, wm831x_ts_pen_down_irq,
- irqf | IRQF_ONESHOT,
- "Touchscreen pen down", wm831x_ts);
- if (error) {
- dev_err(&pdev->dev, "Failed to request pen down IRQ %d: %d\n",
- wm831x_ts->pd_irq, error);
- goto err_data_irq;
- }
- /* set up touch configuration */
- input_dev->name = "WM831x touchscreen";
- input_dev->phys = "wm831x";
- input_dev->open = wm831x_ts_input_open;
- input_dev->close = wm831x_ts_input_close;
- __set_bit(EV_ABS, input_dev->evbit);
- __set_bit(EV_KEY, input_dev->evbit);
- __set_bit(BTN_TOUCH, input_dev->keybit);
- input_set_abs_params(input_dev, ABS_X, 0, 4095, 5, 0);
- input_set_abs_params(input_dev, ABS_Y, 0, 4095, 5, 0);
- if (wm831x_ts->pressure)
- input_set_abs_params(input_dev, ABS_PRESSURE, 0, 4095, 5, 0);
- input_set_drvdata(input_dev, wm831x_ts);
- input_dev->dev.parent = &pdev->dev;
- error = input_register_device(input_dev);
- if (error)
- goto err_pd_irq;
- platform_set_drvdata(pdev, wm831x_ts);
- return 0;
- err_pd_irq:
- free_irq(wm831x_ts->pd_irq, wm831x_ts);
- err_data_irq:
- free_irq(wm831x_ts->data_irq, wm831x_ts);
- err_alloc:
- return error;
- }
- static int wm831x_ts_remove(struct platform_device *pdev)
- {
- struct wm831x_ts *wm831x_ts = platform_get_drvdata(pdev);
- free_irq(wm831x_ts->pd_irq, wm831x_ts);
- free_irq(wm831x_ts->data_irq, wm831x_ts);
- return 0;
- }
- static struct platform_driver wm831x_ts_driver = {
- .driver = {
- .name = "wm831x-touch",
- },
- .probe = wm831x_ts_probe,
- .remove = wm831x_ts_remove,
- };
- module_platform_driver(wm831x_ts_driver);
- /* Module information */
- MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
- MODULE_DESCRIPTION("WM831x PMIC touchscreen driver");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:wm831x-touch");
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