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460 lines
12 KiB
460 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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 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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static int __maybe_unused 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 (input_device_enabled(idev)) |
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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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static int __maybe_unused 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 (input_device_enabled(idev)) |
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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 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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.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" |
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" position read. Default = 55us."); |
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module_param(ts_delay_pressure, int, 0444); |
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MODULE_PARM_DESC(ts_delay_pressure, |
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"delay between panel setup and pressure read." |
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" Default = 0us."); |
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MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver"); |
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MODULE_LICENSE("GPL");
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