446 lines
11 KiB
C
446 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Touchscreen driver for UCB1x00-based touchscreens
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*
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* Copyright (C) 2001 Russell King, All Rights Reserved.
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* Copyright (C) 2005 Pavel Machek
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*
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* 21-Jan-2002 <jco@ict.es> :
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*
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* Added support for synchronous A/D mode. This mode is useful to
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* avoid noise induced in the touchpanel by the LCD, provided that
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* the UCB1x00 has a valid LCD sync signal routed to its ADCSYNC pin.
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* It is important to note that the signal connected to the ADCSYNC
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* pin should provide pulses even when the LCD is blanked, otherwise
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* a pen touch needed to unblank the LCD will never be read.
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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/init.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/freezer.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/mfd/ucb1x00.h>
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#include <mach/collie.h>
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#include <asm/mach-types.h>
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struct ucb1x00_ts {
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struct input_dev *idev;
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struct ucb1x00 *ucb;
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spinlock_t irq_lock;
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unsigned irq_disabled;
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wait_queue_head_t irq_wait;
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struct task_struct *rtask;
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u16 x_res;
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u16 y_res;
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unsigned int adcsync:1;
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};
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static int adcsync;
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static inline void ucb1x00_ts_evt_add(struct ucb1x00_ts *ts, u16 pressure, u16 x, u16 y)
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{
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struct input_dev *idev = ts->idev;
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input_report_abs(idev, ABS_X, x);
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input_report_abs(idev, ABS_Y, y);
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input_report_abs(idev, ABS_PRESSURE, pressure);
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input_report_key(idev, BTN_TOUCH, 1);
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input_sync(idev);
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}
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static inline void ucb1x00_ts_event_release(struct ucb1x00_ts *ts)
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{
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struct input_dev *idev = ts->idev;
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input_report_abs(idev, ABS_PRESSURE, 0);
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input_report_key(idev, BTN_TOUCH, 0);
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input_sync(idev);
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}
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/*
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* Switch to interrupt mode.
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*/
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static inline void ucb1x00_ts_mode_int(struct ucb1x00_ts *ts)
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{
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
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UCB_TS_CR_MODE_INT);
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}
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/*
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* Switch to pressure mode, and read pressure. We don't need to wait
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* here, since both plates are being driven.
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*/
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static inline unsigned int ucb1x00_ts_read_pressure(struct ucb1x00_ts *ts)
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{
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if (machine_is_collie()) {
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ucb1x00_io_write(ts->ucb, COLLIE_TC35143_GPIO_TBL_CHK, 0);
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSPX_POW | UCB_TS_CR_TSMX_POW |
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UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
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udelay(55);
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return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_AD2, ts->adcsync);
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} else {
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
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}
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}
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/*
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* Switch to X position mode and measure Y plate. We switch the plate
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* configuration in pressure mode, then switch to position mode. This
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* gives a faster response time. Even so, we need to wait about 55us
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* for things to stabilise.
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*/
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static inline unsigned int ucb1x00_ts_read_xpos(struct ucb1x00_ts *ts)
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{
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if (machine_is_collie())
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ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
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else {
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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}
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
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udelay(55);
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return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPY, ts->adcsync);
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}
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/*
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* Switch to Y position mode and measure X plate. We switch the plate
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* configuration in pressure mode, then switch to position mode. This
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* gives a faster response time. Even so, we need to wait about 55us
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* for things to stabilise.
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*/
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static inline unsigned int ucb1x00_ts_read_ypos(struct ucb1x00_ts *ts)
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{
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if (machine_is_collie())
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ucb1x00_io_write(ts->ucb, 0, COLLIE_TC35143_GPIO_TBL_CHK);
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else {
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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}
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
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UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
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udelay(55);
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return ucb1x00_adc_read(ts->ucb, UCB_ADC_INP_TSPX, ts->adcsync);
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}
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/*
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* Switch to X plate resistance mode. Set MX to ground, PX to
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* supply. Measure current.
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*/
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static inline unsigned int ucb1x00_ts_read_xres(struct ucb1x00_ts *ts)
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{
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
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}
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/*
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* Switch to Y plate resistance mode. Set MY to ground, PY to
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* supply. Measure current.
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*/
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static inline unsigned int ucb1x00_ts_read_yres(struct ucb1x00_ts *ts)
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{
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR,
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UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
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UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
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return ucb1x00_adc_read(ts->ucb, 0, ts->adcsync);
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}
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static inline int ucb1x00_ts_pen_down(struct ucb1x00_ts *ts)
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{
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unsigned int val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR);
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if (machine_is_collie())
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return (!(val & (UCB_TS_CR_TSPX_LOW)));
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else
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return (val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW));
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}
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/*
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* This is a RT kernel thread that handles the ADC accesses
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* (mainly so we can use semaphores in the UCB1200 core code
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* to serialise accesses to the ADC).
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*/
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static int ucb1x00_thread(void *_ts)
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{
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struct ucb1x00_ts *ts = _ts;
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DECLARE_WAITQUEUE(wait, current);
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bool frozen, ignore = false;
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int valid = 0;
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set_freezable();
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add_wait_queue(&ts->irq_wait, &wait);
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while (!kthread_freezable_should_stop(&frozen)) {
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unsigned int x, y, p;
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signed long timeout;
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if (frozen)
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ignore = true;
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ucb1x00_adc_enable(ts->ucb);
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x = ucb1x00_ts_read_xpos(ts);
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y = ucb1x00_ts_read_ypos(ts);
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p = ucb1x00_ts_read_pressure(ts);
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/*
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* Switch back to interrupt mode.
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*/
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ucb1x00_ts_mode_int(ts);
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ucb1x00_adc_disable(ts->ucb);
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msleep(10);
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ucb1x00_enable(ts->ucb);
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if (ucb1x00_ts_pen_down(ts)) {
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set_current_state(TASK_INTERRUPTIBLE);
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spin_lock_irq(&ts->irq_lock);
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if (ts->irq_disabled) {
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ts->irq_disabled = 0;
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enable_irq(ts->ucb->irq_base + UCB_IRQ_TSPX);
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}
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spin_unlock_irq(&ts->irq_lock);
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ucb1x00_disable(ts->ucb);
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/*
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* If we spat out a valid sample set last time,
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* spit out a "pen off" sample here.
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*/
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if (valid) {
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ucb1x00_ts_event_release(ts);
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valid = 0;
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}
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timeout = MAX_SCHEDULE_TIMEOUT;
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} else {
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ucb1x00_disable(ts->ucb);
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/*
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* Filtering is policy. Policy belongs in user
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* space. We therefore leave it to user space
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* to do any filtering they please.
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*/
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if (!ignore) {
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ucb1x00_ts_evt_add(ts, p, x, y);
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valid = 1;
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}
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set_current_state(TASK_INTERRUPTIBLE);
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timeout = HZ / 100;
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}
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schedule_timeout(timeout);
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}
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remove_wait_queue(&ts->irq_wait, &wait);
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ts->rtask = NULL;
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return 0;
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}
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/*
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* We only detect touch screen _touches_ with this interrupt
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* handler, and even then we just schedule our task.
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*/
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static irqreturn_t ucb1x00_ts_irq(int irq, void *id)
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{
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struct ucb1x00_ts *ts = id;
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spin_lock(&ts->irq_lock);
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ts->irq_disabled = 1;
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disable_irq_nosync(ts->ucb->irq_base + UCB_IRQ_TSPX);
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spin_unlock(&ts->irq_lock);
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wake_up(&ts->irq_wait);
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return IRQ_HANDLED;
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}
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static int ucb1x00_ts_open(struct input_dev *idev)
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{
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struct ucb1x00_ts *ts = input_get_drvdata(idev);
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unsigned long flags = 0;
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int ret = 0;
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BUG_ON(ts->rtask);
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if (machine_is_collie())
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flags = IRQF_TRIGGER_RISING;
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else
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flags = IRQF_TRIGGER_FALLING;
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ts->irq_disabled = 0;
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init_waitqueue_head(&ts->irq_wait);
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ret = request_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ucb1x00_ts_irq,
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flags, "ucb1x00-ts", ts);
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if (ret < 0)
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goto out;
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/*
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* If we do this at all, we should allow the user to
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* measure and read the X and Y resistance at any time.
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*/
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ucb1x00_adc_enable(ts->ucb);
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ts->x_res = ucb1x00_ts_read_xres(ts);
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ts->y_res = ucb1x00_ts_read_yres(ts);
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ucb1x00_adc_disable(ts->ucb);
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ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd");
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if (!IS_ERR(ts->rtask)) {
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ret = 0;
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} else {
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free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts);
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ts->rtask = NULL;
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ret = -EFAULT;
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}
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out:
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return ret;
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}
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/*
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* Release touchscreen resources. Disable IRQs.
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*/
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static void ucb1x00_ts_close(struct input_dev *idev)
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{
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struct ucb1x00_ts *ts = input_get_drvdata(idev);
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if (ts->rtask)
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kthread_stop(ts->rtask);
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ucb1x00_enable(ts->ucb);
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free_irq(ts->ucb->irq_base + UCB_IRQ_TSPX, ts);
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ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
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ucb1x00_disable(ts->ucb);
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}
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/*
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* Initialisation.
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*/
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static int ucb1x00_ts_add(struct ucb1x00_dev *dev)
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{
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struct ucb1x00_ts *ts;
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struct input_dev *idev;
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int err;
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ts = kzalloc(sizeof(struct ucb1x00_ts), GFP_KERNEL);
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idev = input_allocate_device();
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if (!ts || !idev) {
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err = -ENOMEM;
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goto fail;
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}
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ts->ucb = dev->ucb;
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ts->idev = idev;
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ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC;
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spin_lock_init(&ts->irq_lock);
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idev->name = "Touchscreen panel";
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idev->id.product = ts->ucb->id;
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idev->open = ucb1x00_ts_open;
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idev->close = ucb1x00_ts_close;
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idev->dev.parent = &ts->ucb->dev;
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idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
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idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_drvdata(idev, ts);
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ucb1x00_adc_enable(ts->ucb);
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ts->x_res = ucb1x00_ts_read_xres(ts);
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ts->y_res = ucb1x00_ts_read_yres(ts);
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ucb1x00_adc_disable(ts->ucb);
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input_set_abs_params(idev, ABS_X, 0, ts->x_res, 0, 0);
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input_set_abs_params(idev, ABS_Y, 0, ts->y_res, 0, 0);
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input_set_abs_params(idev, ABS_PRESSURE, 0, 0, 0, 0);
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err = input_register_device(idev);
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if (err)
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goto fail;
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dev->priv = ts;
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return 0;
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fail:
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input_free_device(idev);
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kfree(ts);
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return err;
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}
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static void ucb1x00_ts_remove(struct ucb1x00_dev *dev)
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{
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struct ucb1x00_ts *ts = dev->priv;
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input_unregister_device(ts->idev);
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kfree(ts);
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}
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static struct ucb1x00_driver ucb1x00_ts_driver = {
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.add = ucb1x00_ts_add,
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.remove = ucb1x00_ts_remove,
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};
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static int __init ucb1x00_ts_init(void)
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{
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return ucb1x00_register_driver(&ucb1x00_ts_driver);
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}
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static void __exit ucb1x00_ts_exit(void)
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{
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ucb1x00_unregister_driver(&ucb1x00_ts_driver);
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}
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module_param(adcsync, int, 0444);
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module_init(ucb1x00_ts_init);
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module_exit(ucb1x00_ts_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("UCB1x00 touchscreen driver");
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MODULE_LICENSE("GPL");
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