366 lines
8.1 KiB
C
366 lines
8.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Touchscreen driver for Dialog Semiconductor DA9034
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*
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* Copyright (C) 2006-2008 Marvell International Ltd.
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* Fengwei Yin <fengwei.yin@marvell.com>
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* Bin Yang <bin.yang@marvell.com>
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* Eric Miao <eric.miao@marvell.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/da903x.h>
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#include <linux/slab.h>
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#define DA9034_MANUAL_CTRL 0x50
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#define DA9034_LDO_ADC_EN (1 << 4)
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#define DA9034_AUTO_CTRL1 0x51
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#define DA9034_AUTO_CTRL2 0x52
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#define DA9034_AUTO_TSI_EN (1 << 3)
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#define DA9034_PEN_DETECT (1 << 4)
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#define DA9034_TSI_CTRL1 0x53
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#define DA9034_TSI_CTRL2 0x54
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#define DA9034_TSI_X_MSB 0x6c
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#define DA9034_TSI_Y_MSB 0x6d
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#define DA9034_TSI_XY_LSB 0x6e
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enum {
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STATE_IDLE, /* wait for pendown */
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STATE_BUSY, /* TSI busy sampling */
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STATE_STOP, /* sample available */
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STATE_WAIT, /* Wait to start next sample */
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};
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enum {
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EVENT_PEN_DOWN,
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EVENT_PEN_UP,
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EVENT_TSI_READY,
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EVENT_TIMEDOUT,
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};
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struct da9034_touch {
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struct device *da9034_dev;
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struct input_dev *input_dev;
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struct delayed_work tsi_work;
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struct notifier_block notifier;
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int state;
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int interval_ms;
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int x_inverted;
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int y_inverted;
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int last_x;
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int last_y;
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};
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static inline int is_pen_down(struct da9034_touch *touch)
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{
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return da903x_query_status(touch->da9034_dev, DA9034_STATUS_PEN_DOWN);
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}
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static inline int detect_pen_down(struct da9034_touch *touch, int on)
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{
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if (on)
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return da903x_set_bits(touch->da9034_dev,
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DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
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else
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return da903x_clr_bits(touch->da9034_dev,
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DA9034_AUTO_CTRL2, DA9034_PEN_DETECT);
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}
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static int read_tsi(struct da9034_touch *touch)
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{
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uint8_t _x, _y, _v;
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int ret;
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ret = da903x_read(touch->da9034_dev, DA9034_TSI_X_MSB, &_x);
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if (ret)
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return ret;
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ret = da903x_read(touch->da9034_dev, DA9034_TSI_Y_MSB, &_y);
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if (ret)
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return ret;
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ret = da903x_read(touch->da9034_dev, DA9034_TSI_XY_LSB, &_v);
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if (ret)
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return ret;
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touch->last_x = ((_x << 2) & 0x3fc) | (_v & 0x3);
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touch->last_y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2);
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return 0;
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}
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static inline int start_tsi(struct da9034_touch *touch)
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{
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return da903x_set_bits(touch->da9034_dev,
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DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
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}
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static inline int stop_tsi(struct da9034_touch *touch)
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{
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return da903x_clr_bits(touch->da9034_dev,
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DA9034_AUTO_CTRL2, DA9034_AUTO_TSI_EN);
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}
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static inline void report_pen_down(struct da9034_touch *touch)
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{
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int x = touch->last_x;
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int y = touch->last_y;
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x &= 0xfff;
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if (touch->x_inverted)
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x = 1024 - x;
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y &= 0xfff;
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if (touch->y_inverted)
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y = 1024 - y;
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input_report_abs(touch->input_dev, ABS_X, x);
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input_report_abs(touch->input_dev, ABS_Y, y);
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input_report_key(touch->input_dev, BTN_TOUCH, 1);
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input_sync(touch->input_dev);
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}
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static inline void report_pen_up(struct da9034_touch *touch)
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{
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input_report_key(touch->input_dev, BTN_TOUCH, 0);
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input_sync(touch->input_dev);
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}
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static void da9034_event_handler(struct da9034_touch *touch, int event)
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{
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int err;
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switch (touch->state) {
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case STATE_IDLE:
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if (event != EVENT_PEN_DOWN)
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break;
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/* Enable auto measurement of the TSI, this will
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* automatically disable pen down detection
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*/
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err = start_tsi(touch);
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if (err)
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goto err_reset;
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touch->state = STATE_BUSY;
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break;
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case STATE_BUSY:
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if (event != EVENT_TSI_READY)
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break;
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err = read_tsi(touch);
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if (err)
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goto err_reset;
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/* Disable auto measurement of the TSI, so that
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* pen down status will be available
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*/
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err = stop_tsi(touch);
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if (err)
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goto err_reset;
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touch->state = STATE_STOP;
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/* FIXME: PEN_{UP/DOWN} events are expected to be
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* available by stopping TSI, but this is found not
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* always true, delay and simulate such an event
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* here is more reliable
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*/
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mdelay(1);
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da9034_event_handler(touch,
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is_pen_down(touch) ? EVENT_PEN_DOWN :
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EVENT_PEN_UP);
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break;
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case STATE_STOP:
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if (event == EVENT_PEN_DOWN) {
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report_pen_down(touch);
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schedule_delayed_work(&touch->tsi_work,
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msecs_to_jiffies(touch->interval_ms));
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touch->state = STATE_WAIT;
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}
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if (event == EVENT_PEN_UP) {
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report_pen_up(touch);
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touch->state = STATE_IDLE;
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}
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break;
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case STATE_WAIT:
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if (event != EVENT_TIMEDOUT)
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break;
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if (is_pen_down(touch)) {
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start_tsi(touch);
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touch->state = STATE_BUSY;
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} else {
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report_pen_up(touch);
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touch->state = STATE_IDLE;
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}
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break;
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}
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return;
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err_reset:
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touch->state = STATE_IDLE;
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stop_tsi(touch);
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detect_pen_down(touch, 1);
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}
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static void da9034_tsi_work(struct work_struct *work)
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{
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struct da9034_touch *touch =
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container_of(work, struct da9034_touch, tsi_work.work);
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da9034_event_handler(touch, EVENT_TIMEDOUT);
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}
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static int da9034_touch_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct da9034_touch *touch =
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container_of(nb, struct da9034_touch, notifier);
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if (event & DA9034_EVENT_TSI_READY)
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da9034_event_handler(touch, EVENT_TSI_READY);
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if ((event & DA9034_EVENT_PEN_DOWN) && touch->state == STATE_IDLE)
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da9034_event_handler(touch, EVENT_PEN_DOWN);
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return 0;
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}
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static int da9034_touch_open(struct input_dev *dev)
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{
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struct da9034_touch *touch = input_get_drvdata(dev);
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int ret;
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ret = da903x_register_notifier(touch->da9034_dev, &touch->notifier,
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DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
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if (ret)
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return -EBUSY;
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/* Enable ADC LDO */
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ret = da903x_set_bits(touch->da9034_dev,
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DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
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if (ret)
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return ret;
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/* TSI_DELAY: 3 slots, TSI_SKIP: 3 slots */
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ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL1, 0x1b);
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if (ret)
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return ret;
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ret = da903x_write(touch->da9034_dev, DA9034_TSI_CTRL2, 0x00);
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if (ret)
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return ret;
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touch->state = STATE_IDLE;
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detect_pen_down(touch, 1);
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return 0;
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}
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static void da9034_touch_close(struct input_dev *dev)
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{
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struct da9034_touch *touch = input_get_drvdata(dev);
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da903x_unregister_notifier(touch->da9034_dev, &touch->notifier,
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DA9034_EVENT_PEN_DOWN | DA9034_EVENT_TSI_READY);
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cancel_delayed_work_sync(&touch->tsi_work);
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touch->state = STATE_IDLE;
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stop_tsi(touch);
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detect_pen_down(touch, 0);
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/* Disable ADC LDO */
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da903x_clr_bits(touch->da9034_dev,
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DA9034_MANUAL_CTRL, DA9034_LDO_ADC_EN);
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}
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static int da9034_touch_probe(struct platform_device *pdev)
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{
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struct da9034_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct da9034_touch *touch;
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struct input_dev *input_dev;
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int error;
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touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch),
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GFP_KERNEL);
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if (!touch) {
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dev_err(&pdev->dev, "failed to allocate driver data\n");
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return -ENOMEM;
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}
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touch->da9034_dev = pdev->dev.parent;
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if (pdata) {
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touch->interval_ms = pdata->interval_ms;
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touch->x_inverted = pdata->x_inverted;
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touch->y_inverted = pdata->y_inverted;
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} else {
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/* fallback into default */
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touch->interval_ms = 10;
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}
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INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
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touch->notifier.notifier_call = da9034_touch_notifier;
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input_dev = devm_input_allocate_device(&pdev->dev);
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if (!input_dev) {
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dev_err(&pdev->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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input_dev->name = pdev->name;
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input_dev->open = da9034_touch_open;
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input_dev->close = da9034_touch_close;
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input_dev->dev.parent = &pdev->dev;
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__set_bit(EV_ABS, input_dev->evbit);
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__set_bit(ABS_X, input_dev->absbit);
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__set_bit(ABS_Y, input_dev->absbit);
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input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
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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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touch->input_dev = input_dev;
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input_set_drvdata(input_dev, touch);
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error = input_register_device(input_dev);
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if (error)
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return error;
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return 0;
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}
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static struct platform_driver da9034_touch_driver = {
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.driver = {
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.name = "da9034-touch",
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},
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.probe = da9034_touch_probe,
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};
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module_platform_driver(da9034_touch_driver);
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MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9034");
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MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>, Bin Yang <bin.yang@marvell.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9034-touch");
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