1 files changed, 446 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/atmel-wm97xx.c b/drivers/input/touchscreen/atmel-wm97xx.c
new file mode 100644
index 00000000000..35377f583e2
--- /dev/null
+++ b/drivers/input/touchscreen/atmel-wm97xx.c
@@ -0,0 +1,446 @@
+/*
+ * Atmel AT91 and AVR32 continuous touch screen driver for Wolfson WM97xx AC97
+ * codecs.
+ *
+ * Copyright (C) 2008 - 2009 Atmel Corporation
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.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/timer.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#define AC97C_ICA               0x10
+#define AC97C_CBRHR             0x30
+#define AC97C_CBSR              0x38
+#define AC97C_CBMR              0x3c
+#define AC97C_IER               0x54
+#define AC97C_IDR               0x58
+
+#define AC97C_RXRDY             (1 << 4)
+#define AC97C_OVRUN             (1 << 5)
+
+#define AC97C_CMR_SIZE_20       (0 << 16)
+#define AC97C_CMR_SIZE_18       (1 << 16)
+#define AC97C_CMR_SIZE_16       (2 << 16)
+#define AC97C_CMR_SIZE_10       (3 << 16)
+#define AC97C_CMR_CEM_LITTLE    (1 << 18)
+#define AC97C_CMR_CEM_BIG       (0 << 18)
+#define AC97C_CMR_CENA          (1 << 21)
+
+#define AC97C_INT_CBEVT         (1 << 4)
+
+#define AC97C_SR_CAEVT          (1 << 3)
+
+#define AC97C_CH_MASK(slot)                                             \
+        (0x7 << (3 * (slot - 3)))
+#define AC97C_CH_ASSIGN(slot, channel)                                  \
+        (AC97C_CHANNEL_##channel << (3 * (slot - 3)))
+#define AC97C_CHANNEL_NONE      0x0
+#define AC97C_CHANNEL_B         0x2
+
+#define ac97c_writel(chip, reg, val)                    \
+        __raw_writel((val), (chip)->regs + AC97C_##reg)
+#define ac97c_readl(chip, reg)                          \
+        __raw_readl((chip)->regs + AC97C_##reg)
+
+#ifdef CONFIG_CPU_AT32AP700X
+#define ATMEL_WM97XX_AC97C_IOMEM        (0xfff02800)
+#define ATMEL_WM97XX_AC97C_IRQ          (29)
+#define ATMEL_WM97XX_GPIO_DEFAULT       (32+16) /* Pin 16 on port B. */
+#else
+#error Unkown CPU, this driver only supports AT32AP700X CPUs.
+#endif
+
+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;
+
+/*
+ * Pen sampling frequency (Hz) in continuous mode.
+ */
+static int cont_rate = 188;
+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 = 1;
+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");
+
+/*
+ * GPIO line number.
+ *
+ * Set to GPIO number where the signal from the WM97xx device is hooked up.
+ */
+static int atmel_gpio_line = ATMEL_WM97XX_GPIO_DEFAULT;
+module_param(atmel_gpio_line, int, 0);
+MODULE_PARM_DESC(atmel_gpio_line, "GPIO line number connected to WM97xx");
+
+struct atmel_wm97xx {
+        struct wm97xx           *wm;
+        struct timer_list       pen_timer;
+        void __iomem            *regs;
+        unsigned long           ac97c_irq;
+        unsigned long           gpio_pen;
+        unsigned long           gpio_irq;
+        unsigned short          x;
+        unsigned short          y;
+};
+
+static irqreturn_t atmel_wm97xx_channel_b_interrupt(int irq, void *dev_id)
+{
+        struct atmel_wm97xx *atmel_wm97xx = dev_id;
+        struct wm97xx *wm = atmel_wm97xx->wm;
+        int status = ac97c_readl(atmel_wm97xx, CBSR);
+        irqreturn_t retval = IRQ_NONE;
+
+        if (status & AC97C_OVRUN) {
+                dev_dbg(&wm->touch_dev->dev, "AC97C overrun\n");
+                ac97c_readl(atmel_wm97xx, CBRHR);
+                retval = IRQ_HANDLED;
+        } else if (status & AC97C_RXRDY) {
+                u16 data;
+                u16 value;
+                u16 source;
+                u16 pen_down;
+
+                data = ac97c_readl(atmel_wm97xx, CBRHR);
+                value = data & 0x0fff;
+                source = data & WM97XX_ADCSRC_MASK;
+                pen_down = (data & WM97XX_PEN_DOWN) >> 8;
+
+                if (source == WM97XX_ADCSEL_X)
+                        atmel_wm97xx->x = value;
+                if (source == WM97XX_ADCSEL_Y)
+                        atmel_wm97xx->y = value;
+
+                if (!pressure && source == WM97XX_ADCSEL_Y) {
+                        input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
+                        input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
+                        input_report_key(wm->input_dev, BTN_TOUCH, pen_down);
+                        input_sync(wm->input_dev);
+                } else if (pressure && source == WM97XX_ADCSEL_PRES) {
+                        input_report_abs(wm->input_dev, ABS_X, atmel_wm97xx->x);
+                        input_report_abs(wm->input_dev, ABS_Y, atmel_wm97xx->y);
+                        input_report_abs(wm->input_dev, ABS_PRESSURE, value);
+                        input_report_key(wm->input_dev, BTN_TOUCH, value);
+                        input_sync(wm->input_dev);
+                }
+
+                retval = IRQ_HANDLED;
+        }
+
+        return retval;
+}
+
+static void atmel_wm97xx_acc_pen_up(struct wm97xx *wm)
+{
+        struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
+        struct input_dev *input_dev = wm->input_dev;
+        int pen_down = gpio_get_value(atmel_wm97xx->gpio_pen);
+
+        if (pen_down != 0) {
+                mod_timer(&atmel_wm97xx->pen_timer,
+                          jiffies + msecs_to_jiffies(1));
+        } else {
+                if (pressure)
+                        input_report_abs(input_dev, ABS_PRESSURE, 0);
+                input_report_key(input_dev, BTN_TOUCH, 0);
+                input_sync(input_dev);
+        }
+}
+
+static void atmel_wm97xx_pen_timer(unsigned long data)
+{
+        atmel_wm97xx_acc_pen_up((struct wm97xx *)data);
+}
+
+static int atmel_wm97xx_acc_startup(struct wm97xx *wm)
+{
+        struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(wm->touch_dev);
+        int idx = 0;
+
+        if (wm->ac97 == NULL)
+                return -ENODEV;
+
+        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->touch_dev->dev, "atmel accelerated touchscreen driver, "
+                        "%d samples/sec\n", cinfo[sp_idx].speed);
+
+        if (pen_int) {
+                unsigned long reg;
+
+                wm->pen_irq = atmel_wm97xx->gpio_irq;
+
+                switch (wm->id) {
+                case WM9712_ID2: /* Fall through. */
+                case WM9713_ID2:
+                        /*
+                         * Use GPIO 13 (PEN_DOWN) to assert GPIO line 3
+                         * (PENDOWN).
+                         */
+                        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_3, WM97XX_GPIO_OUT,
+                                        WM97XX_GPIO_POL_HIGH,
+                                        WM97XX_GPIO_NOTSTICKY,
+                                        WM97XX_GPIO_NOWAKE);
+                case WM9705_ID2: /* Fall through. */
+                        /*
+                         * Enable touch data slot in AC97 controller channel B.
+                         */
+                        reg = ac97c_readl(atmel_wm97xx, ICA);
+                        reg &= ~AC97C_CH_MASK(wm->acc_slot);
+                        reg |= AC97C_CH_ASSIGN(wm->acc_slot, B);
+                        ac97c_writel(atmel_wm97xx, ICA, reg);
+
+                        /*
+                         * Enable channel and interrupt for RXRDY and OVERRUN.
+                         */
+                        ac97c_writel(atmel_wm97xx, CBMR, AC97C_CMR_CENA
+                                        | AC97C_CMR_CEM_BIG
+                                        | AC97C_CMR_SIZE_16
+                                        | AC97C_OVRUN
+                                        | AC97C_RXRDY);
+                        /* Dummy read to empty RXRHR. */
+                        ac97c_readl(atmel_wm97xx, CBRHR);
+                        /*
+                         * Enable interrupt for channel B in the AC97
+                         * controller.
+                         */
+                        ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
+                        break;
+                default:
+                        dev_err(&wm->touch_dev->dev, "pen down irq not "
+                                        "supported on this device\n");
+                        pen_int = 0;
+                        break;
+                }
+        }
+
+        return 0;
+}
+
+static void atmel_wm97xx_acc_shutdown(struct wm97xx *wm)
+{
+        if (pen_int) {
+                struct atmel_wm97xx *atmel_wm97xx =
+                        platform_get_drvdata(wm->touch_dev);
+                unsigned long ica;
+
+                switch (wm->id & 0xffff) {
+                case WM9705_ID2: /* Fall through. */
+                case WM9712_ID2: /* Fall through. */
+                case WM9713_ID2:
+                        /* Disable slot and turn off channel B interrupts. */
+                        ica = ac97c_readl(atmel_wm97xx, ICA);
+                        ica &= ~AC97C_CH_MASK(wm->acc_slot);
+                        ac97c_writel(atmel_wm97xx, ICA, ica);
+                        ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
+                        ac97c_writel(atmel_wm97xx, CBMR, 0);
+                        wm->pen_irq = 0;
+                        break;
+                default:
+                        dev_err(&wm->touch_dev->dev, "unknown codec\n");
+                        break;
+                }
+        }
+}
+
+static void atmel_wm97xx_irq_enable(struct wm97xx *wm, int enable)
+{
+        /* Intentionally left empty. */
+}
+
+static struct wm97xx_mach_ops atmel_mach_ops = {
+        .acc_enabled    = 1,
+        .acc_pen_up     = atmel_wm97xx_acc_pen_up,
+        .acc_startup    = atmel_wm97xx_acc_startup,
+        .acc_shutdown   = atmel_wm97xx_acc_shutdown,
+        .irq_enable     = atmel_wm97xx_irq_enable,
+        .irq_gpio       = WM97XX_GPIO_3,
+};
+
+static int __init atmel_wm97xx_probe(struct platform_device *pdev)
+{
+        struct wm97xx *wm = platform_get_drvdata(pdev);
+        struct atmel_wm97xx *atmel_wm97xx;
+        int ret;
+
+        atmel_wm97xx = kzalloc(sizeof(struct atmel_wm97xx), GFP_KERNEL);
+        if (!atmel_wm97xx) {
+                dev_dbg(&pdev->dev, "out of memory\n");
+                return -ENOMEM;
+        }
+
+        atmel_wm97xx->wm        = wm;
+        atmel_wm97xx->regs      = (void *)ATMEL_WM97XX_AC97C_IOMEM;
+        atmel_wm97xx->ac97c_irq = ATMEL_WM97XX_AC97C_IRQ;
+        atmel_wm97xx->gpio_pen  = atmel_gpio_line;
+        atmel_wm97xx->gpio_irq  = gpio_to_irq(atmel_wm97xx->gpio_pen);
+
+        setup_timer(&atmel_wm97xx->pen_timer, atmel_wm97xx_pen_timer,
+                        (unsigned long)wm);
+
+        ret = request_irq(atmel_wm97xx->ac97c_irq,
+                          atmel_wm97xx_channel_b_interrupt,
+                          IRQF_SHARED, "atmel-wm97xx-ch-b", atmel_wm97xx);
+        if (ret) {
+                dev_dbg(&pdev->dev, "could not request ac97c irq\n");
+                goto err;
+        }
+
+        platform_set_drvdata(pdev, atmel_wm97xx);
+
+        ret = wm97xx_register_mach_ops(wm, &atmel_mach_ops);
+        if (ret)
+                goto err_irq;
+
+        return ret;
+
+err_irq:
+        free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
+err:
+        platform_set_drvdata(pdev, NULL);
+        kfree(atmel_wm97xx);
+        return ret;
+}
+
+static int __exit atmel_wm97xx_remove(struct platform_device *pdev)
+{
+        struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
+        struct wm97xx *wm = atmel_wm97xx->wm;
+
+        ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
+        free_irq(atmel_wm97xx->ac97c_irq, atmel_wm97xx);
+        del_timer_sync(&atmel_wm97xx->pen_timer);
+        wm97xx_unregister_mach_ops(wm);
+        platform_set_drvdata(pdev, NULL);
+        kfree(atmel_wm97xx);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int atmel_wm97xx_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+        struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
+
+        ac97c_writel(atmel_wm97xx, IDR, AC97C_INT_CBEVT);
+        disable_irq(atmel_wm97xx->gpio_irq);
+        del_timer_sync(&atmel_wm97xx->pen_timer);
+
+        return 0;
+}
+
+static int atmel_wm97xx_resume(struct platform_device *pdev)
+{
+        struct atmel_wm97xx *atmel_wm97xx = platform_get_drvdata(pdev);
+        struct wm97xx *wm = atmel_wm97xx->wm;
+
+        if (wm->input_dev->users) {
+                enable_irq(atmel_wm97xx->gpio_irq);
+                ac97c_writel(atmel_wm97xx, IER, AC97C_INT_CBEVT);
+        }
+
+        return 0;
+}
+#else
+#define atmel_wm97xx_suspend    NULL
+#define atmel_wm97xx_resume     NULL
+#endif
+
+static struct platform_driver atmel_wm97xx_driver = {
+        .remove         = __exit_p(atmel_wm97xx_remove),
+        .driver         = {
+                .name = "wm97xx-touch",
+        },
+        .suspend        = atmel_wm97xx_suspend,
+        .resume         = atmel_wm97xx_resume,
+};
+
+static int __init atmel_wm97xx_init(void)
+{
+        return platform_driver_probe(&atmel_wm97xx_driver, atmel_wm97xx_probe);
+}
+module_init(atmel_wm97xx_init);
+
+static void __exit atmel_wm97xx_exit(void)
+{
+        platform_driver_unregister(&atmel_wm97xx_driver);
+}
+module_exit(atmel_wm97xx_exit);
+
+MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");
+MODULE_DESCRIPTION("wm97xx continuous touch driver for Atmel AT91 and AVR32");
+MODULE_LICENSE("GPL");