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    Subject[PATCH 5/6] Driver for WM97xx touchscreens in streaming mode on Mainstone
    Date
    Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
    Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com>
    Signed-off-by: Mike Arthur <mike.arthur@wolfsonmicro.com>
    Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
    Cc: Stanley Cai <stanley.cai@intel.com>
    Cc: Rodolfo Giometti <giometti@enneenne.com>
    Cc: Russell King <rmk@arm.linux.org.uk>
    Cc: Marc Kleine-Budde <mkl@pengutronix.de>
    Cc: Ian Molton <spyro@f2s.com>
    Cc: Vince Sanders <vince@kyllikki.org>
    Cc: Andrew Zabolotny <zap@homelink.ru>
    ---
    drivers/input/touchscreen/mainstone-wm97xx.c | 298 ++++++++++++++++++++++++++
    1 files changed, 298 insertions(+), 0 deletions(-)
    create mode 100644 drivers/input/touchscreen/mainstone-wm97xx.c

    diff --git a/drivers/input/touchscreen/mainstone-wm97xx.c b/drivers/input/touchscreen/mainstone-wm97xx.c
    new file mode 100644
    index 0000000..8e1c35d
    --- /dev/null
    +++ b/drivers/input/touchscreen/mainstone-wm97xx.c
    @@ -0,0 +1,298 @@
    +/*
    + * mainstone-wm97xx.c -- Mainstone Continuous Touch screen driver for
    + * Wolfson WM97xx AC97 Codecs.
    + *
    + * Copyright 2004, 2007 Wolfson Microelectronics PLC.
    + * Author: Liam Girdwood
    + * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
    + * Parts Copyright : Ian Molton <spyro@f2s.com>
    + * Andrew Zabolotny <zap@homelink.ru>
    + *
    + * This program is free software; you can redistribute it and/or modify it
    + * under the terms of the GNU General Public License as published by the
    + * Free Software Foundation; either version 2 of the License, or (at your
    + * option) any later version.
    + *
    + * Notes:
    + * This is a wm97xx extended touch driver to capture touch
    + * data in a continuous manner on the Intel XScale archictecture
    + *
    + * Features:
    + * - codecs supported:- WM9705, WM9712, WM9713
    + * - processors supported:- Intel XScale PXA25x, PXA26x, PXA27x
    + *
    + */
    +
    +#include <linux/module.h>
    +#include <linux/moduleparam.h>
    +#include <linux/version.h>
    +#include <linux/kernel.h>
    +#include <linux/init.h>
    +#include <linux/delay.h>
    +#include <linux/irq.h>
    +#include <linux/interrupt.h>
    +#include <linux/wm97xx.h>
    +#include <linux/io.h>
    +#include <asm/arch/pxa-regs.h>
    +
    +#define VERSION "0.13"
    +
    +struct continuous {
    + u16 id; /* codec id */
    + u8 code; /* continuous code */
    + u8 reads; /* number of coord reads per read cycle */
    + u32 speed; /* number of coords per second */
    +};
    +
    +#define WM_READS(sp) ((sp / HZ) + 1)
    +
    +static const struct continuous cinfo[] = {
    + {WM9705_ID2, 0, WM_READS(94), 94},
    + {WM9705_ID2, 1, WM_READS(188), 188},
    + {WM9705_ID2, 2, WM_READS(375), 375},
    + {WM9705_ID2, 3, WM_READS(750), 750},
    + {WM9712_ID2, 0, WM_READS(94), 94},
    + {WM9712_ID2, 1, WM_READS(188), 188},
    + {WM9712_ID2, 2, WM_READS(375), 375},
    + {WM9712_ID2, 3, WM_READS(750), 750},
    + {WM9713_ID2, 0, WM_READS(94), 94},
    + {WM9713_ID2, 1, WM_READS(120), 120},
    + {WM9713_ID2, 2, WM_READS(154), 154},
    + {WM9713_ID2, 3, WM_READS(188), 188},
    +};
    +
    +/* continuous speed index */
    +static int sp_idx;
    +static u16 last, tries;
    +
    +/*
    + * Pen sampling frequency (Hz) in continuous mode.
    + */
    +static int cont_rate = 200;
    +module_param(cont_rate, int, 0);
    +MODULE_PARM_DESC(cont_rate, "Sampling rate in continuous mode (Hz)");
    +
    +/*
    + * Pen down detection.
    + *
    + * This driver can either poll or use an interrupt to indicate a pen down
    + * event. If the irq request fails then it will fall back to polling mode.
    + */
    +static int pen_int;
    +module_param(pen_int, int, 0);
    +MODULE_PARM_DESC(pen_int, "Pen down detection (1 = interrupt, 0 = polling)");
    +
    +/*
    + * Pressure readback.
    + *
    + * Set to 1 to read back pen down pressure
    + */
    +static int pressure;
    +module_param(pressure, int, 0);
    +MODULE_PARM_DESC(pressure, "Pressure readback (1 = pressure, 0 = no pressure)");
    +
    +/*
    + * AC97 touch data slot.
    + *
    + * Touch screen readback data ac97 slot
    + */
    +static int ac97_touch_slot = 5;
    +module_param(ac97_touch_slot, int, 0);
    +MODULE_PARM_DESC(ac97_touch_slot, "Touch screen data slot AC97 number");
    +
    +
    +/* flush AC97 slot 5 FIFO on pxa machines */
    +#ifdef CONFIG_PXA27x
    +static void wm97xx_acc_pen_up(struct wm97xx *wm)
    +{
    + set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout(1);
    +
    + while (MISR & (1 << 2))
    + MODR;
    +}
    +#else
    +static void wm97xx_acc_pen_up(struct wm97xx *wm)
    +{
    + int count = 16;
    + set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout(1);
    +
    + while (count < 16) {
    + MODR;
    + count--;
    + }
    +}
    +#endif
    +
    +static int wm97xx_acc_pen_down(struct wm97xx *wm)
    +{
    + u16 x, y, p = 0x100 | WM97XX_ADCSEL_PRES;
    + int reads = 0;
    +
    + /* data is never immediately available after pen down irq */
    + set_current_state(TASK_INTERRUPTIBLE);
    + schedule_timeout(1);
    +
    + if (tries > 5) {
    + tries = 0;
    + return RC_PENUP;
    + }
    +
    + x = MODR;
    + if (x == last) {
    + tries++;
    + return RC_AGAIN;
    + }
    + last = x;
    + do {
    + if (reads)
    + x = MODR;
    + y = MODR;
    + if (pressure)
    + p = MODR;
    +
    + /* are samples valid */
    + if ((x & 0x7000) != WM97XX_ADCSEL_X ||
    + (y & 0x7000) != WM97XX_ADCSEL_Y ||
    + (p & 0x7000) != WM97XX_ADCSEL_PRES)
    + goto up;
    +
    + /* coordinate is good */
    + tries = 0;
    + input_report_abs(wm->input_dev, ABS_X, x & 0xfff);
    + input_report_abs(wm->input_dev, ABS_Y, y & 0xfff);
    + input_report_abs(wm->input_dev, ABS_PRESSURE, p & 0xfff);
    + input_sync(wm->input_dev);
    + reads++;
    + } while (reads < cinfo[sp_idx].reads);
    +up:
    + return RC_PENDOWN | RC_AGAIN;
    +}
    +
    +static int wm97xx_acc_startup(struct wm97xx *wm)
    +{
    + int idx = 0;
    +
    + /* check we have a codec */
    + if (wm->ac97 == NULL)
    + return -ENODEV;
    +
    + /* Go you big red fire engine */
    + for (idx = 0; idx < ARRAY_SIZE(cinfo); idx++) {
    + if (wm->id != cinfo[idx].id)
    + continue;
    + sp_idx = idx;
    + if (cont_rate <= cinfo[idx].speed)
    + break;
    + }
    + wm->acc_rate = cinfo[sp_idx].code;
    + wm->acc_slot = ac97_touch_slot;
    + dev_info(wm->dev,
    + "mainstone accelerated touchscreen driver, %d samples/sec\n",
    + cinfo[sp_idx].speed);
    +
    + /* codec specific irq config */
    + if (pen_int) {
    + switch (wm->id) {
    + case WM9705_ID2:
    + wm->pen_irq = IRQ_GPIO(4);
    + set_irq_type(IRQ_GPIO(4), IRQT_BOTHEDGE);
    + break;
    + case WM9712_ID2:
    + case WM9713_ID2:
    + /* enable pen down interrupt */
    + /* use PEN_DOWN GPIO 13 to assert IRQ on GPIO line 2 */
    + wm->pen_irq = MAINSTONE_AC97_IRQ;
    + wm97xx_config_gpio(wm, WM97XX_GPIO_13, WM97XX_GPIO_IN,
    + WM97XX_GPIO_POL_HIGH,
    + WM97XX_GPIO_STICKY,
    + WM97XX_GPIO_WAKE);
    + wm97xx_config_gpio(wm, WM97XX_GPIO_2, WM97XX_GPIO_OUT,
    + WM97XX_GPIO_POL_HIGH,
    + WM97XX_GPIO_NOTSTICKY,
    + WM97XX_GPIO_NOWAKE);
    + break;
    + default:
    + dev_err(wm->dev,
    + "pen down irq not supported on this device\n");
    + pen_int = 0;
    + break;
    + }
    + }
    +
    + return 0;
    +}
    +
    +static void wm97xx_acc_shutdown(struct wm97xx *wm)
    +{
    + /* codec specific deconfig */
    + if (pen_int) {
    + switch (wm->id & 0xffff) {
    + case WM9705_ID2:
    + wm->pen_irq = 0;
    + break;
    + case WM9712_ID2:
    + case WM9713_ID2:
    + /* disable interrupt */
    + wm->pen_irq = 0;
    + break;
    + }
    + }
    +}
    +
    +static void wm97xx_irq_enable(struct wm97xx *wm, int enable)
    +{
    + if (enable)
    + enable_irq(wm->pen_irq);
    + else
    + disable_irq(wm->pen_irq);
    +}
    +
    +static struct wm97xx_mach_ops mainstone_mach_ops = {
    + .acc_enabled = 1,
    + .acc_pen_up = wm97xx_acc_pen_up,
    + .acc_pen_down = wm97xx_acc_pen_down,
    + .acc_startup = wm97xx_acc_startup,
    + .acc_shutdown = wm97xx_acc_shutdown,
    + .irq_enable = wm97xx_irq_enable,
    +};
    +
    +static int mainstone_wm97xx_probe(struct platform_device *pdev)
    +{
    + struct wm97xx *wm = platform_get_drvdata(pdev);
    + return wm97xx_register_mach_ops(wm, &mainstone_mach_ops);
    +}
    +
    +static int mainstone_wm97xx_remove(struct platform_device *pdev)
    +{
    + struct wm97xx *wm = platform_get_drvdata(pdev);
    + wm97xx_unregister_mach_ops(wm);
    + return 0;
    +}
    +
    +static struct platform_driver mainstone_wm97xx_driver = {
    + .probe = mainstone_wm97xx_probe,
    + .remove = mainstone_wm97xx_remove,
    + .driver = {
    + .name = "wm97xx-touch",
    + },
    +};
    +
    +static int __init mainstone_wm97xx_init(void)
    +{
    + return platform_driver_register(&mainstone_wm97xx_driver);
    +}
    +
    +static void __exit mainstone_wm97xx_exit(void)
    +{
    + platform_driver_unregister(&mainstone_wm97xx_driver);
    +}
    +
    +module_init(mainstone_wm97xx_init);
    +module_exit(mainstone_wm97xx_exit);
    +
    +/* Module information */
    +MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
    +MODULE_DESCRIPTION("wm97xx continuous touch driver for mainstone");
    +MODULE_LICENSE("GPL");
    --
    1.5.3.8


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