mirror of https://gitee.com/openkylin/linux.git
637 lines
15 KiB
C
637 lines
15 KiB
C
/*
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* TSC2004/TSC2005 touchscreen driver core
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*
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* Copyright (C) 2006-2010 Nokia Corporation
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* Copyright (C) 2015 QWERTY Embedded Design
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* Copyright (C) 2015 EMAC Inc.
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*
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* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
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* based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/input.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regmap.h>
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#include <linux/gpio/consumer.h>
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#include "tsc200x-core.h"
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/*
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* The touchscreen interface operates as follows:
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*
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* 1) Pen is pressed against the touchscreen.
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* 2) TSC200X performs AD conversion.
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* 3) After the conversion is done TSC200X drives DAV line down.
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* 4) GPIO IRQ is received and tsc200x_irq_thread() is scheduled.
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* 5) tsc200x_irq_thread() queues up a transfer to fetch the x, y, z1, z2
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* values.
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* 6) tsc200x_irq_thread() reports coordinates to input layer and sets up
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* tsc200x_penup_timer() to be called after TSC200X_PENUP_TIME_MS (40ms).
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* 7) When the penup timer expires, there have not been touch or DAV interrupts
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* during the last 40ms which means the pen has been lifted.
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*
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* ESD recovery via a hardware reset is done if the TSC200X doesn't respond
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* after a configurable period (in ms) of activity. If esd_timeout is 0, the
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* watchdog is disabled.
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*/
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static const struct regmap_range tsc200x_writable_ranges[] = {
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regmap_reg_range(TSC200X_REG_AUX_HIGH, TSC200X_REG_CFR2),
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};
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static const struct regmap_access_table tsc200x_writable_table = {
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.yes_ranges = tsc200x_writable_ranges,
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.n_yes_ranges = ARRAY_SIZE(tsc200x_writable_ranges),
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};
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const struct regmap_config tsc200x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.reg_stride = 0x08,
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.max_register = 0x78,
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.read_flag_mask = TSC200X_REG_READ,
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.write_flag_mask = TSC200X_REG_PND0,
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.wr_table = &tsc200x_writable_table,
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.use_single_rw = true,
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};
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EXPORT_SYMBOL_GPL(tsc200x_regmap_config);
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struct tsc200x_data {
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u16 x;
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u16 y;
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u16 z1;
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u16 z2;
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} __packed;
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#define TSC200X_DATA_REGS 4
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struct tsc200x {
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struct device *dev;
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struct regmap *regmap;
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__u16 bustype;
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struct input_dev *idev;
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char phys[32];
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struct mutex mutex;
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/* raw copy of previous x,y,z */
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int in_x;
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int in_y;
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int in_z1;
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int in_z2;
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spinlock_t lock;
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struct timer_list penup_timer;
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unsigned int esd_timeout;
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struct delayed_work esd_work;
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unsigned long last_valid_interrupt;
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unsigned int x_plate_ohm;
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bool opened;
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bool suspended;
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bool pen_down;
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struct regulator *vio;
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struct gpio_desc *reset_gpio;
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int (*tsc200x_cmd)(struct device *dev, u8 cmd);
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int irq;
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};
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static void tsc200x_update_pen_state(struct tsc200x *ts,
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int x, int y, int pressure)
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{
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if (pressure) {
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input_report_abs(ts->idev, ABS_X, x);
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input_report_abs(ts->idev, ABS_Y, y);
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input_report_abs(ts->idev, ABS_PRESSURE, pressure);
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if (!ts->pen_down) {
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input_report_key(ts->idev, BTN_TOUCH, !!pressure);
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ts->pen_down = true;
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}
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} else {
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input_report_abs(ts->idev, ABS_PRESSURE, 0);
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if (ts->pen_down) {
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input_report_key(ts->idev, BTN_TOUCH, 0);
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ts->pen_down = false;
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}
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}
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input_sync(ts->idev);
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dev_dbg(ts->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
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pressure);
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}
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static irqreturn_t tsc200x_irq_thread(int irq, void *_ts)
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{
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struct tsc200x *ts = _ts;
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unsigned long flags;
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unsigned int pressure;
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struct tsc200x_data tsdata;
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int error;
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/* read the coordinates */
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error = regmap_bulk_read(ts->regmap, TSC200X_REG_X, &tsdata,
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TSC200X_DATA_REGS);
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if (unlikely(error))
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goto out;
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/* validate position */
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if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))
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goto out;
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/* Skip reading if the pressure components are out of range */
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if (unlikely(tsdata.z1 == 0 || tsdata.z2 > MAX_12BIT))
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goto out;
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if (unlikely(tsdata.z1 >= tsdata.z2))
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goto out;
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/*
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* Skip point if this is a pen down with the exact same values as
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* the value before pen-up - that implies SPI fed us stale data
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*/
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if (!ts->pen_down &&
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ts->in_x == tsdata.x && ts->in_y == tsdata.y &&
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ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {
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goto out;
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}
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/*
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* At this point we are happy we have a valid and useful reading.
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* Remember it for later comparisons. We may now begin downsampling.
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*/
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ts->in_x = tsdata.x;
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ts->in_y = tsdata.y;
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ts->in_z1 = tsdata.z1;
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ts->in_z2 = tsdata.z2;
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/* Compute touch pressure resistance using equation #1 */
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pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;
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pressure = pressure * ts->x_plate_ohm / 4096;
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if (unlikely(pressure > MAX_12BIT))
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goto out;
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spin_lock_irqsave(&ts->lock, flags);
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tsc200x_update_pen_state(ts, tsdata.x, tsdata.y, pressure);
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mod_timer(&ts->penup_timer,
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jiffies + msecs_to_jiffies(TSC200X_PENUP_TIME_MS));
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spin_unlock_irqrestore(&ts->lock, flags);
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ts->last_valid_interrupt = jiffies;
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out:
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return IRQ_HANDLED;
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}
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static void tsc200x_penup_timer(unsigned long data)
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{
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struct tsc200x *ts = (struct tsc200x *)data;
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unsigned long flags;
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spin_lock_irqsave(&ts->lock, flags);
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tsc200x_update_pen_state(ts, 0, 0, 0);
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spin_unlock_irqrestore(&ts->lock, flags);
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}
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static void tsc200x_start_scan(struct tsc200x *ts)
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{
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regmap_write(ts->regmap, TSC200X_REG_CFR0, TSC200X_CFR0_INITVALUE);
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regmap_write(ts->regmap, TSC200X_REG_CFR1, TSC200X_CFR1_INITVALUE);
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regmap_write(ts->regmap, TSC200X_REG_CFR2, TSC200X_CFR2_INITVALUE);
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ts->tsc200x_cmd(ts->dev, TSC200X_CMD_NORMAL);
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}
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static void tsc200x_stop_scan(struct tsc200x *ts)
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{
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ts->tsc200x_cmd(ts->dev, TSC200X_CMD_STOP);
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}
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static void tsc200x_reset(struct tsc200x *ts)
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{
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if (ts->reset_gpio) {
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gpiod_set_value_cansleep(ts->reset_gpio, 1);
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usleep_range(100, 500); /* only 10us required */
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gpiod_set_value_cansleep(ts->reset_gpio, 0);
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}
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}
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/* must be called with ts->mutex held */
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static void __tsc200x_disable(struct tsc200x *ts)
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{
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tsc200x_stop_scan(ts);
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disable_irq(ts->irq);
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del_timer_sync(&ts->penup_timer);
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cancel_delayed_work_sync(&ts->esd_work);
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enable_irq(ts->irq);
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}
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/* must be called with ts->mutex held */
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static void __tsc200x_enable(struct tsc200x *ts)
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{
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tsc200x_start_scan(ts);
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if (ts->esd_timeout && ts->reset_gpio) {
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ts->last_valid_interrupt = jiffies;
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schedule_delayed_work(&ts->esd_work,
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round_jiffies_relative(
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msecs_to_jiffies(ts->esd_timeout)));
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}
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}
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static ssize_t tsc200x_selftest_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct tsc200x *ts = dev_get_drvdata(dev);
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unsigned int temp_high;
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unsigned int temp_high_orig;
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unsigned int temp_high_test;
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bool success = true;
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int error;
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mutex_lock(&ts->mutex);
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/*
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* Test TSC200X communications via temp high register.
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*/
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__tsc200x_disable(ts);
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error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high_orig);
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if (error) {
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dev_warn(dev, "selftest failed: read error %d\n", error);
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success = false;
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goto out;
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}
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temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
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error = regmap_write(ts->regmap, TSC200X_REG_TEMP_HIGH, temp_high_test);
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if (error) {
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dev_warn(dev, "selftest failed: write error %d\n", error);
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success = false;
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goto out;
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}
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error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);
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if (error) {
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dev_warn(dev, "selftest failed: read error %d after write\n",
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error);
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success = false;
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goto out;
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}
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if (temp_high != temp_high_test) {
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dev_warn(dev, "selftest failed: %d != %d\n",
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temp_high, temp_high_test);
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success = false;
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}
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/* hardware reset */
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tsc200x_reset(ts);
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if (!success)
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goto out;
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/* test that the reset really happened */
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error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);
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if (error) {
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dev_warn(dev, "selftest failed: read error %d after reset\n",
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error);
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success = false;
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goto out;
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}
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if (temp_high != temp_high_orig) {
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dev_warn(dev, "selftest failed after reset: %d != %d\n",
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temp_high, temp_high_orig);
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success = false;
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}
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out:
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__tsc200x_enable(ts);
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mutex_unlock(&ts->mutex);
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return sprintf(buf, "%d\n", success);
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}
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static DEVICE_ATTR(selftest, S_IRUGO, tsc200x_selftest_show, NULL);
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static struct attribute *tsc200x_attrs[] = {
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&dev_attr_selftest.attr,
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NULL
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};
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static umode_t tsc200x_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct tsc200x *ts = dev_get_drvdata(dev);
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umode_t mode = attr->mode;
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if (attr == &dev_attr_selftest.attr) {
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if (!ts->reset_gpio)
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mode = 0;
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}
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return mode;
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}
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static const struct attribute_group tsc200x_attr_group = {
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.is_visible = tsc200x_attr_is_visible,
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.attrs = tsc200x_attrs,
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};
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static void tsc200x_esd_work(struct work_struct *work)
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{
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struct tsc200x *ts = container_of(work, struct tsc200x, esd_work.work);
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int error;
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unsigned int r;
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if (!mutex_trylock(&ts->mutex)) {
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/*
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* If the mutex is taken, it means that disable or enable is in
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* progress. In that case just reschedule the work. If the work
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* is not needed, it will be canceled by disable.
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*/
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goto reschedule;
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}
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if (time_is_after_jiffies(ts->last_valid_interrupt +
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msecs_to_jiffies(ts->esd_timeout)))
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goto out;
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/* We should be able to read register without disabling interrupts. */
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error = regmap_read(ts->regmap, TSC200X_REG_CFR0, &r);
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if (!error &&
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!((r ^ TSC200X_CFR0_INITVALUE) & TSC200X_CFR0_RW_MASK)) {
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goto out;
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}
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/*
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* If we could not read our known value from configuration register 0
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* then we should reset the controller as if from power-up and start
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* scanning again.
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*/
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dev_info(ts->dev, "TSC200X not responding - resetting\n");
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disable_irq(ts->irq);
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del_timer_sync(&ts->penup_timer);
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tsc200x_update_pen_state(ts, 0, 0, 0);
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tsc200x_reset(ts);
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enable_irq(ts->irq);
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tsc200x_start_scan(ts);
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out:
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mutex_unlock(&ts->mutex);
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reschedule:
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/* re-arm the watchdog */
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schedule_delayed_work(&ts->esd_work,
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round_jiffies_relative(
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msecs_to_jiffies(ts->esd_timeout)));
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}
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static int tsc200x_open(struct input_dev *input)
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{
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struct tsc200x *ts = input_get_drvdata(input);
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mutex_lock(&ts->mutex);
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if (!ts->suspended)
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__tsc200x_enable(ts);
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ts->opened = true;
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mutex_unlock(&ts->mutex);
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return 0;
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}
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static void tsc200x_close(struct input_dev *input)
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{
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struct tsc200x *ts = input_get_drvdata(input);
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mutex_lock(&ts->mutex);
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if (!ts->suspended)
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__tsc200x_disable(ts);
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ts->opened = false;
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mutex_unlock(&ts->mutex);
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}
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int tsc200x_probe(struct device *dev, int irq, const struct input_id *tsc_id,
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struct regmap *regmap,
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int (*tsc200x_cmd)(struct device *dev, u8 cmd))
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{
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struct tsc200x *ts;
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struct input_dev *input_dev;
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u32 x_plate_ohm;
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u32 esd_timeout;
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int error;
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if (irq <= 0) {
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dev_err(dev, "no irq\n");
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return -ENODEV;
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}
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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if (!tsc200x_cmd) {
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dev_err(dev, "no cmd function\n");
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return -ENODEV;
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}
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ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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input_dev = devm_input_allocate_device(dev);
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if (!input_dev)
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return -ENOMEM;
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ts->irq = irq;
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ts->dev = dev;
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ts->idev = input_dev;
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ts->regmap = regmap;
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ts->tsc200x_cmd = tsc200x_cmd;
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error = device_property_read_u32(dev, "ti,x-plate-ohms", &x_plate_ohm);
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ts->x_plate_ohm = error ? TSC200X_DEF_RESISTOR : x_plate_ohm;
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error = device_property_read_u32(dev, "ti,esd-recovery-timeout-ms",
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&esd_timeout);
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ts->esd_timeout = error ? 0 : esd_timeout;
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ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(ts->reset_gpio)) {
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error = PTR_ERR(ts->reset_gpio);
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dev_err(dev, "error acquiring reset gpio: %d\n", error);
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return error;
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}
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ts->vio = devm_regulator_get(dev, "vio");
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if (IS_ERR(ts->vio)) {
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error = PTR_ERR(ts->vio);
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dev_err(dev, "error acquiring vio regulator: %d", error);
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return error;
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}
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mutex_init(&ts->mutex);
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spin_lock_init(&ts->lock);
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setup_timer(&ts->penup_timer, tsc200x_penup_timer, (unsigned long)ts);
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INIT_DELAYED_WORK(&ts->esd_work, tsc200x_esd_work);
|
|
|
|
snprintf(ts->phys, sizeof(ts->phys),
|
|
"%s/input-ts", dev_name(dev));
|
|
|
|
if (tsc_id->product == 2004) {
|
|
input_dev->name = "TSC200X touchscreen";
|
|
} else {
|
|
input_dev->name = devm_kasprintf(dev, GFP_KERNEL,
|
|
"TSC%04d touchscreen",
|
|
tsc_id->product);
|
|
if (!input_dev->name)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
input_dev->phys = ts->phys;
|
|
input_dev->id = *tsc_id;
|
|
|
|
input_dev->open = tsc200x_open;
|
|
input_dev->close = tsc200x_close;
|
|
|
|
input_set_drvdata(input_dev, ts);
|
|
|
|
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
|
|
|
|
input_set_abs_params(input_dev, ABS_X,
|
|
0, MAX_12BIT, TSC200X_DEF_X_FUZZ, 0);
|
|
input_set_abs_params(input_dev, ABS_Y,
|
|
0, MAX_12BIT, TSC200X_DEF_Y_FUZZ, 0);
|
|
input_set_abs_params(input_dev, ABS_PRESSURE,
|
|
0, MAX_12BIT, TSC200X_DEF_P_FUZZ, 0);
|
|
|
|
touchscreen_parse_properties(input_dev, false, NULL);
|
|
|
|
/* Ensure the touchscreen is off */
|
|
tsc200x_stop_scan(ts);
|
|
|
|
error = devm_request_threaded_irq(dev, irq, NULL,
|
|
tsc200x_irq_thread,
|
|
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
|
"tsc200x", ts);
|
|
if (error) {
|
|
dev_err(dev, "Failed to request irq, err: %d\n", error);
|
|
return error;
|
|
}
|
|
|
|
error = regulator_enable(ts->vio);
|
|
if (error)
|
|
return error;
|
|
|
|
dev_set_drvdata(dev, ts);
|
|
error = sysfs_create_group(&dev->kobj, &tsc200x_attr_group);
|
|
if (error) {
|
|
dev_err(dev,
|
|
"Failed to create sysfs attributes, err: %d\n", error);
|
|
goto disable_regulator;
|
|
}
|
|
|
|
error = input_register_device(ts->idev);
|
|
if (error) {
|
|
dev_err(dev,
|
|
"Failed to register input device, err: %d\n", error);
|
|
goto err_remove_sysfs;
|
|
}
|
|
|
|
irq_set_irq_wake(irq, 1);
|
|
return 0;
|
|
|
|
err_remove_sysfs:
|
|
sysfs_remove_group(&dev->kobj, &tsc200x_attr_group);
|
|
disable_regulator:
|
|
regulator_disable(ts->vio);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tsc200x_probe);
|
|
|
|
int tsc200x_remove(struct device *dev)
|
|
{
|
|
struct tsc200x *ts = dev_get_drvdata(dev);
|
|
|
|
sysfs_remove_group(&dev->kobj, &tsc200x_attr_group);
|
|
|
|
regulator_disable(ts->vio);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tsc200x_remove);
|
|
|
|
static int __maybe_unused tsc200x_suspend(struct device *dev)
|
|
{
|
|
struct tsc200x *ts = dev_get_drvdata(dev);
|
|
|
|
mutex_lock(&ts->mutex);
|
|
|
|
if (!ts->suspended && ts->opened)
|
|
__tsc200x_disable(ts);
|
|
|
|
ts->suspended = true;
|
|
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused tsc200x_resume(struct device *dev)
|
|
{
|
|
struct tsc200x *ts = dev_get_drvdata(dev);
|
|
|
|
mutex_lock(&ts->mutex);
|
|
|
|
if (ts->suspended && ts->opened)
|
|
__tsc200x_enable(ts);
|
|
|
|
ts->suspended = false;
|
|
|
|
mutex_unlock(&ts->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
SIMPLE_DEV_PM_OPS(tsc200x_pm_ops, tsc200x_suspend, tsc200x_resume);
|
|
EXPORT_SYMBOL_GPL(tsc200x_pm_ops);
|
|
|
|
MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
|
|
MODULE_DESCRIPTION("TSC200x Touchscreen Driver Core");
|
|
MODULE_LICENSE("GPL");
|