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