467 lines
12 KiB
C
467 lines
12 KiB
C
/*
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* Philips UCB1400 touchscreen driver
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*
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* Author: Nicolas Pitre
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* Created: September 25, 2006
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* Copyright: MontaVista Software, Inc.
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*
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* Spliting done by: Marek Vasut <marek.vasut@gmail.com>
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* If something doesn't work and it worked before spliting, e-mail me,
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* dont bother Nicolas please ;-)
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* This code is heavily based on ucb1x00-*.c copyrighted by Russell King
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* covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
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* been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/input.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/ucb1400.h>
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#define UCB1400_TS_POLL_PERIOD 10 /* ms */
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static bool adcsync;
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static int ts_delay = 55; /* us */
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static int ts_delay_pressure; /* us */
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/* Switch to interrupt mode. */
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static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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 unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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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udelay(ts_delay_pressure);
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return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
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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 unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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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ucb1400_reg_write(ucb->ac97, 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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ucb1400_reg_write(ucb->ac97, 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(ts_delay);
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return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, 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 int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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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ucb1400_reg_write(ucb->ac97, 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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ucb1400_reg_write(ucb->ac97, 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(ts_delay);
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return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, 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 unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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 ucb1400_adc_read(ucb->ac97, 0, 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 unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, 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 ucb1400_adc_read(ucb->ac97, 0, adcsync);
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}
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static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb)
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{
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unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR);
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return val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW);
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}
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static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
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ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX);
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}
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static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb)
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{
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ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
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}
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static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y)
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{
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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 void ucb1400_ts_event_release(struct input_dev *idev)
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{
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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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static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
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{
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unsigned int isr;
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isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
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if (isr & UCB_IE_TSPX)
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ucb1400_ts_irq_disable(ucb);
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else
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dev_dbg(&ucb->ts_idev->dev,
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"ucb1400: unexpected IE_STATUS = %#x\n", isr);
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}
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/*
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* A restriction with interrupts exists when using the ucb1400, as
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* the codec read/write routines may sleep while waiting for codec
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* access completion and uses semaphores for access control to the
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* AC97 bus. Therefore the driver is forced to use threaded interrupt
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* handler.
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*/
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static irqreturn_t ucb1400_irq(int irqnr, void *devid)
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{
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struct ucb1400_ts *ucb = devid;
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unsigned int x, y, p;
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bool penup;
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if (unlikely(irqnr != ucb->irq))
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return IRQ_NONE;
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ucb1400_clear_pending_irq(ucb);
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/* Start with a small delay before checking pendown state */
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msleep(UCB1400_TS_POLL_PERIOD);
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while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) {
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ucb1400_adc_enable(ucb->ac97);
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x = ucb1400_ts_read_xpos(ucb);
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y = ucb1400_ts_read_ypos(ucb);
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p = ucb1400_ts_read_pressure(ucb);
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ucb1400_adc_disable(ucb->ac97);
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ucb1400_ts_report_event(ucb->ts_idev, p, x, y);
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wait_event_timeout(ucb->ts_wait, ucb->stopped,
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msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
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}
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ucb1400_ts_event_release(ucb->ts_idev);
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if (!ucb->stopped) {
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/* Switch back to interrupt mode. */
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ucb1400_ts_mode_int(ucb);
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ucb1400_ts_irq_enable(ucb);
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}
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return IRQ_HANDLED;
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}
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static void ucb1400_ts_stop(struct ucb1400_ts *ucb)
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{
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/* Signal IRQ thread to stop polling and disable the handler. */
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ucb->stopped = true;
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mb();
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wake_up(&ucb->ts_wait);
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disable_irq(ucb->irq);
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ucb1400_ts_irq_disable(ucb);
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ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
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}
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/* Must be called with ts->lock held */
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static void ucb1400_ts_start(struct ucb1400_ts *ucb)
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{
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/* Tell IRQ thread that it may poll the device. */
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ucb->stopped = false;
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mb();
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ucb1400_ts_mode_int(ucb);
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ucb1400_ts_irq_enable(ucb);
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enable_irq(ucb->irq);
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}
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static int ucb1400_ts_open(struct input_dev *idev)
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{
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struct ucb1400_ts *ucb = input_get_drvdata(idev);
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ucb1400_ts_start(ucb);
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return 0;
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}
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static void ucb1400_ts_close(struct input_dev *idev)
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{
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struct ucb1400_ts *ucb = input_get_drvdata(idev);
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ucb1400_ts_stop(ucb);
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}
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#ifndef NO_IRQ
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#define NO_IRQ 0
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#endif
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/*
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* Try to probe our interrupt, rather than relying on lots of
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* hard-coded machine dependencies.
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*/
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static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb,
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struct platform_device *pdev)
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{
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unsigned long mask, timeout;
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mask = probe_irq_on();
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/* Enable the ADC interrupt. */
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ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
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ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
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/* Cause an ADC interrupt. */
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ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
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ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
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/* Wait for the conversion to complete. */
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timeout = jiffies + HZ/2;
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while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
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UCB_ADC_DAT_VALID)) {
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cpu_relax();
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if (time_after(jiffies, timeout)) {
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dev_err(&pdev->dev, "timed out in IRQ probe\n");
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probe_irq_off(mask);
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return -ENODEV;
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}
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}
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ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);
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/* Disable and clear interrupt. */
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ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
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ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
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ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
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/* Read triggered interrupt. */
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ucb->irq = probe_irq_off(mask);
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if (ucb->irq < 0 || ucb->irq == NO_IRQ)
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return -ENODEV;
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return 0;
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}
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static int ucb1400_ts_probe(struct platform_device *pdev)
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{
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struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
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int error, x_res, y_res;
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u16 fcsr;
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ucb->ts_idev = input_allocate_device();
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if (!ucb->ts_idev) {
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error = -ENOMEM;
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goto err;
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}
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/* Only in case the IRQ line wasn't supplied, try detecting it */
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if (ucb->irq < 0) {
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error = ucb1400_ts_detect_irq(ucb, pdev);
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if (error) {
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dev_err(&pdev->dev, "IRQ probe failed\n");
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goto err_free_devs;
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}
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}
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dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq);
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init_waitqueue_head(&ucb->ts_wait);
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input_set_drvdata(ucb->ts_idev, ucb);
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ucb->ts_idev->dev.parent = &pdev->dev;
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ucb->ts_idev->name = "UCB1400 touchscreen interface";
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ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97,
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AC97_VENDOR_ID1);
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ucb->ts_idev->id.product = ucb->id;
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ucb->ts_idev->open = ucb1400_ts_open;
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ucb->ts_idev->close = ucb1400_ts_close;
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ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
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ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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/*
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* Enable ADC filter to prevent horrible jitter on Colibri.
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* This also further reduces jitter on boards where ADCSYNC
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* pin is connected.
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*/
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fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
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ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE);
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ucb1400_adc_enable(ucb->ac97);
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x_res = ucb1400_ts_read_xres(ucb);
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y_res = ucb1400_ts_read_yres(ucb);
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ucb1400_adc_disable(ucb->ac97);
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dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res);
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input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
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input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
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input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);
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ucb1400_ts_stop(ucb);
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error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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"UCB1400", ucb);
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if (error) {
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dev_err(&pdev->dev,
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"unable to grab irq%d: %d\n", ucb->irq, error);
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goto err_free_devs;
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}
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error = input_register_device(ucb->ts_idev);
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if (error)
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goto err_free_irq;
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return 0;
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err_free_irq:
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free_irq(ucb->irq, ucb);
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err_free_devs:
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input_free_device(ucb->ts_idev);
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err:
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return error;
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}
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static int ucb1400_ts_remove(struct platform_device *pdev)
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{
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struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
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free_irq(ucb->irq, ucb);
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input_unregister_device(ucb->ts_idev);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int ucb1400_ts_suspend(struct device *dev)
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{
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struct ucb1400_ts *ucb = dev_get_platdata(dev);
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struct input_dev *idev = ucb->ts_idev;
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mutex_lock(&idev->mutex);
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if (idev->users)
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ucb1400_ts_start(ucb);
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mutex_unlock(&idev->mutex);
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return 0;
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}
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static int ucb1400_ts_resume(struct device *dev)
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{
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struct ucb1400_ts *ucb = dev_get_platdata(dev);
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struct input_dev *idev = ucb->ts_idev;
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mutex_lock(&idev->mutex);
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if (idev->users)
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ucb1400_ts_stop(ucb);
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mutex_unlock(&idev->mutex);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops,
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ucb1400_ts_suspend, ucb1400_ts_resume);
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static struct platform_driver ucb1400_ts_driver = {
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.probe = ucb1400_ts_probe,
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.remove = ucb1400_ts_remove,
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.driver = {
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.name = "ucb1400_ts",
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.owner = THIS_MODULE,
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.pm = &ucb1400_ts_pm_ops,
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},
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};
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module_platform_driver(ucb1400_ts_driver);
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|
|
|
module_param(adcsync, bool, 0444);
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MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");
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|
|
|
module_param(ts_delay, int, 0444);
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|
MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
|
|
" position read. Default = 55us.");
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|
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|
module_param(ts_delay_pressure, int, 0444);
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|
MODULE_PARM_DESC(ts_delay_pressure,
|
|
"delay between panel setup and pressure read."
|
|
" Default = 0us.");
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|
|
|
MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
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MODULE_LICENSE("GPL");
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