| /* |
| * Philips UCB1400 touchscreen driver |
| * |
| * Author: Nicolas Pitre |
| * Created: September 25, 2006 |
| * Copyright: MontaVista Software, Inc. |
| * |
| * Spliting done by: Marek Vasut <marek.vasut@gmail.com> |
| * If something doesn't work and it worked before spliting, e-mail me, |
| * dont bother Nicolas please ;-) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This code is heavily based on ucb1x00-*.c copyrighted by Russell King |
| * covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has |
| * been made separate from ucb1x00-core/ucb1x00-ts on Russell's request. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/sched.h> |
| #include <linux/wait.h> |
| #include <linux/input.h> |
| #include <linux/device.h> |
| #include <linux/interrupt.h> |
| #include <linux/ucb1400.h> |
| |
| #define UCB1400_TS_POLL_PERIOD 10 /* ms */ |
| |
| static bool adcsync; |
| static int ts_delay = 55; /* us */ |
| static int ts_delay_pressure; /* us */ |
| |
| /* Switch to interrupt mode. */ |
| static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | |
| UCB_TS_CR_MODE_INT); |
| } |
| |
| /* |
| * Switch to pressure mode, and read pressure. We don't need to wait |
| * here, since both plates are being driven. |
| */ |
| static unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| |
| udelay(ts_delay_pressure); |
| |
| return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync); |
| } |
| |
| /* |
| * Switch to X position mode and measure Y plate. We switch the plate |
| * configuration in pressure mode, then switch to position mode. This |
| * gives a faster response time. Even so, we need to wait about 55us |
| * for things to stabilise. |
| */ |
| static unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); |
| |
| udelay(ts_delay); |
| |
| return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync); |
| } |
| |
| /* |
| * Switch to Y position mode and measure X plate. We switch the plate |
| * configuration in pressure mode, then switch to position mode. This |
| * gives a faster response time. Even so, we need to wait about 55us |
| * for things to stabilise. |
| */ |
| static int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | |
| UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA); |
| |
| udelay(ts_delay); |
| |
| return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync); |
| } |
| |
| /* |
| * Switch to X plate resistance mode. Set MX to ground, PX to |
| * supply. Measure current. |
| */ |
| static unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| return ucb1400_adc_read(ucb->ac97, 0, adcsync); |
| } |
| |
| /* |
| * Switch to Y plate resistance mode. Set MY to ground, PY to |
| * supply. Measure current. |
| */ |
| static unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, |
| UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW | |
| UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA); |
| return ucb1400_adc_read(ucb->ac97, 0, adcsync); |
| } |
| |
| static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb) |
| { |
| unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR); |
| |
| return val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW); |
| } |
| |
| static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX); |
| } |
| |
| static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb) |
| { |
| ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0); |
| } |
| |
| static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y) |
| { |
| input_report_abs(idev, ABS_X, x); |
| input_report_abs(idev, ABS_Y, y); |
| input_report_abs(idev, ABS_PRESSURE, pressure); |
| input_report_key(idev, BTN_TOUCH, 1); |
| input_sync(idev); |
| } |
| |
| static void ucb1400_ts_event_release(struct input_dev *idev) |
| { |
| input_report_abs(idev, ABS_PRESSURE, 0); |
| input_report_key(idev, BTN_TOUCH, 0); |
| input_sync(idev); |
| } |
| |
| static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb) |
| { |
| unsigned int isr; |
| |
| isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0); |
| |
| if (isr & UCB_IE_TSPX) |
| ucb1400_ts_irq_disable(ucb); |
| else |
| dev_dbg(&ucb->ts_idev->dev, |
| "ucb1400: unexpected IE_STATUS = %#x\n", isr); |
| } |
| |
| /* |
| * A restriction with interrupts exists when using the ucb1400, as |
| * the codec read/write routines may sleep while waiting for codec |
| * access completion and uses semaphores for access control to the |
| * AC97 bus. Therefore the driver is forced to use threaded interrupt |
| * handler. |
| */ |
| static irqreturn_t ucb1400_irq(int irqnr, void *devid) |
| { |
| struct ucb1400_ts *ucb = devid; |
| unsigned int x, y, p; |
| bool penup; |
| |
| if (unlikely(irqnr != ucb->irq)) |
| return IRQ_NONE; |
| |
| ucb1400_clear_pending_irq(ucb); |
| |
| /* Start with a small delay before checking pendown state */ |
| msleep(UCB1400_TS_POLL_PERIOD); |
| |
| while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) { |
| |
| ucb1400_adc_enable(ucb->ac97); |
| x = ucb1400_ts_read_xpos(ucb); |
| y = ucb1400_ts_read_ypos(ucb); |
| p = ucb1400_ts_read_pressure(ucb); |
| ucb1400_adc_disable(ucb->ac97); |
| |
| ucb1400_ts_report_event(ucb->ts_idev, p, x, y); |
| |
| wait_event_timeout(ucb->ts_wait, ucb->stopped, |
| msecs_to_jiffies(UCB1400_TS_POLL_PERIOD)); |
| } |
| |
| ucb1400_ts_event_release(ucb->ts_idev); |
| |
| if (!ucb->stopped) { |
| /* Switch back to interrupt mode. */ |
| ucb1400_ts_mode_int(ucb); |
| ucb1400_ts_irq_enable(ucb); |
| } |
| |
| return IRQ_HANDLED; |
| } |
| |
| static void ucb1400_ts_stop(struct ucb1400_ts *ucb) |
| { |
| /* Signal IRQ thread to stop polling and disable the handler. */ |
| ucb->stopped = true; |
| mb(); |
| wake_up(&ucb->ts_wait); |
| disable_irq(ucb->irq); |
| |
| ucb1400_ts_irq_disable(ucb); |
| ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0); |
| } |
| |
| /* Must be called with ts->lock held */ |
| static void ucb1400_ts_start(struct ucb1400_ts *ucb) |
| { |
| /* Tell IRQ thread that it may poll the device. */ |
| ucb->stopped = false; |
| mb(); |
| |
| ucb1400_ts_mode_int(ucb); |
| ucb1400_ts_irq_enable(ucb); |
| |
| enable_irq(ucb->irq); |
| } |
| |
| static int ucb1400_ts_open(struct input_dev *idev) |
| { |
| struct ucb1400_ts *ucb = input_get_drvdata(idev); |
| |
| ucb1400_ts_start(ucb); |
| |
| return 0; |
| } |
| |
| static void ucb1400_ts_close(struct input_dev *idev) |
| { |
| struct ucb1400_ts *ucb = input_get_drvdata(idev); |
| |
| ucb1400_ts_stop(ucb); |
| } |
| |
| #ifndef NO_IRQ |
| #define NO_IRQ 0 |
| #endif |
| |
| /* |
| * Try to probe our interrupt, rather than relying on lots of |
| * hard-coded machine dependencies. |
| */ |
| static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb, |
| struct platform_device *pdev) |
| { |
| unsigned long mask, timeout; |
| |
| mask = probe_irq_on(); |
| |
| /* Enable the ADC interrupt. */ |
| ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0); |
| |
| /* Cause an ADC interrupt. */ |
| ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA); |
| ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START); |
| |
| /* Wait for the conversion to complete. */ |
| timeout = jiffies + HZ/2; |
| while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) & |
| UCB_ADC_DAT_VALID)) { |
| cpu_relax(); |
| if (time_after(jiffies, timeout)) { |
| dev_err(&pdev->dev, "timed out in IRQ probe\n"); |
| probe_irq_off(mask); |
| return -ENODEV; |
| } |
| } |
| ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0); |
| |
| /* Disable and clear interrupt. */ |
| ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff); |
| ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0); |
| |
| /* Read triggered interrupt. */ |
| ucb->irq = probe_irq_off(mask); |
| if (ucb->irq < 0 || ucb->irq == NO_IRQ) |
| return -ENODEV; |
| |
| return 0; |
| } |
| |
| static int ucb1400_ts_probe(struct platform_device *pdev) |
| { |
| struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev); |
| int error, x_res, y_res; |
| u16 fcsr; |
| |
| ucb->ts_idev = input_allocate_device(); |
| if (!ucb->ts_idev) { |
| error = -ENOMEM; |
| goto err; |
| } |
| |
| /* Only in case the IRQ line wasn't supplied, try detecting it */ |
| if (ucb->irq < 0) { |
| error = ucb1400_ts_detect_irq(ucb, pdev); |
| if (error) { |
| dev_err(&pdev->dev, "IRQ probe failed\n"); |
| goto err_free_devs; |
| } |
| } |
| dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq); |
| |
| init_waitqueue_head(&ucb->ts_wait); |
| |
| input_set_drvdata(ucb->ts_idev, ucb); |
| |
| ucb->ts_idev->dev.parent = &pdev->dev; |
| ucb->ts_idev->name = "UCB1400 touchscreen interface"; |
| ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97, |
| AC97_VENDOR_ID1); |
| ucb->ts_idev->id.product = ucb->id; |
| ucb->ts_idev->open = ucb1400_ts_open; |
| ucb->ts_idev->close = ucb1400_ts_close; |
| ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); |
| ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
| |
| /* |
| * Enable ADC filter to prevent horrible jitter on Colibri. |
| * This also further reduces jitter on boards where ADCSYNC |
| * pin is connected. |
| */ |
| fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR); |
| ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE); |
| |
| ucb1400_adc_enable(ucb->ac97); |
| x_res = ucb1400_ts_read_xres(ucb); |
| y_res = ucb1400_ts_read_yres(ucb); |
| ucb1400_adc_disable(ucb->ac97); |
| dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res); |
| |
| input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0); |
| input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0); |
| input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0); |
| |
| ucb1400_ts_stop(ucb); |
| |
| error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq, |
| IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
| "UCB1400", ucb); |
| if (error) { |
| dev_err(&pdev->dev, |
| "unable to grab irq%d: %d\n", ucb->irq, error); |
| goto err_free_devs; |
| } |
| |
| error = input_register_device(ucb->ts_idev); |
| if (error) |
| goto err_free_irq; |
| |
| return 0; |
| |
| err_free_irq: |
| free_irq(ucb->irq, ucb); |
| err_free_devs: |
| input_free_device(ucb->ts_idev); |
| err: |
| return error; |
| } |
| |
| static int ucb1400_ts_remove(struct platform_device *pdev) |
| { |
| struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev); |
| |
| free_irq(ucb->irq, ucb); |
| input_unregister_device(ucb->ts_idev); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused ucb1400_ts_suspend(struct device *dev) |
| { |
| struct ucb1400_ts *ucb = dev_get_platdata(dev); |
| struct input_dev *idev = ucb->ts_idev; |
| |
| mutex_lock(&idev->mutex); |
| |
| if (idev->users) |
| ucb1400_ts_start(ucb); |
| |
| mutex_unlock(&idev->mutex); |
| return 0; |
| } |
| |
| static int __maybe_unused ucb1400_ts_resume(struct device *dev) |
| { |
| struct ucb1400_ts *ucb = dev_get_platdata(dev); |
| struct input_dev *idev = ucb->ts_idev; |
| |
| mutex_lock(&idev->mutex); |
| |
| if (idev->users) |
| ucb1400_ts_stop(ucb); |
| |
| mutex_unlock(&idev->mutex); |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops, |
| ucb1400_ts_suspend, ucb1400_ts_resume); |
| |
| static struct platform_driver ucb1400_ts_driver = { |
| .probe = ucb1400_ts_probe, |
| .remove = ucb1400_ts_remove, |
| .driver = { |
| .name = "ucb1400_ts", |
| .owner = THIS_MODULE, |
| .pm = &ucb1400_ts_pm_ops, |
| }, |
| }; |
| module_platform_driver(ucb1400_ts_driver); |
| |
| module_param(adcsync, bool, 0444); |
| MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin."); |
| |
| module_param(ts_delay, int, 0444); |
| MODULE_PARM_DESC(ts_delay, "Delay between panel setup and" |
| " position read. Default = 55us."); |
| |
| module_param(ts_delay_pressure, int, 0444); |
| MODULE_PARM_DESC(ts_delay_pressure, |
| "delay between panel setup and pressure read." |
| " Default = 0us."); |
| |
| MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver"); |
| MODULE_LICENSE("GPL"); |