Input: add support for PXA27x keyboard controller

Signed-off-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 268 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 64509689fa65..be65e50e7a33 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -203,6 +203,15 @@ config KEYBOARD_OMAP
           To compile this driver as a module, choose M here: the
           module will be called omap-keypad.
 
+config KEYBOARD_PXA27x
+        tristate "PXA27x keyboard support"
+        depends on PXA27x
+        help
+          Enable support for PXA27x matrix keyboard controller
+
+          To compile this driver as a module, choose M here: the
+          module will be called pxa27x_keyboard.
+
 config KEYBOARD_AAED2000
         tristate "AAED-2000 keyboard"
         depends on MACH_AAED2000
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 586a0fe53be6..fc1d1f263167 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_KEYBOARD_SPITZ)		+= spitzkbd.o
 obj-$(CONFIG_KEYBOARD_HIL)              += hil_kbd.o
 obj-$(CONFIG_KEYBOARD_HIL_OLD)          += hilkbd.o
 obj-$(CONFIG_KEYBOARD_OMAP)             += omap-keypad.o
+obj-$(CONFIG_KEYBOARD_PXA27x)           += pxa27x_keyboard.o
 obj-$(CONFIG_KEYBOARD_AAED2000)         += aaed2000_kbd.o
 obj-$(CONFIG_KEYBOARD_GPIO)             += gpio_keys.o
 
diff --git a/drivers/input/keyboard/pxa27x_keyboard.c b/drivers/input/keyboard/pxa27x_keyboard.c
new file mode 100644
index 000000000000..1a2afbf213f8
--- /dev/null
+++ b/drivers/input/keyboard/pxa27x_keyboard.c
@@ -0,0 +1,258 @@
+/*
+ * linux/drivers/input/keyboard/pxa27x_keyboard.c
+ *
+ * Driver for the pxa27x matrix keyboard controller.
+ *
+ * Created:     Feb 22, 2007
+ * Author:      Rodolfo Giometti <giometti@linux.it>
+ *
+ * Based on a previous implementations by Kevin O'Connor
+ * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
+ * on some suggestions by Nicolas Pitre <nico@cam.org>.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/irqs.h>
+#include <asm/arch/pxa27x_keyboard.h>
+
+#define DRIVER_NAME             "pxa27x-keyboard"
+
+#define KPASMKP(col)            (col/2 == 0 ? KPASMKP0 : \
+                                 col/2 == 1 ? KPASMKP1 : \
+                                 col/2 == 2 ? KPASMKP2 : KPASMKP3)
+#define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))
+
+static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
+{
+        struct platform_device *pdev = dev_id;
+        struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
+        struct input_dev *input_dev = platform_get_drvdata(pdev);
+        unsigned long kpc = KPC;
+        int p, row, col, rel;
+
+        if (kpc & KPC_DI) {
+                unsigned long kpdk = KPDK;
+
+                if (!(kpdk & KPDK_DKP)) {
+                        /* better luck next time */
+                } else if (kpc & KPC_REE0) {
+                        unsigned long kprec = KPREC;
+                        KPREC = 0x7f;
+
+                        if (kprec & KPREC_OF0)
+                                rel = (kprec & 0xff) + 0x7f;
+                        else if (kprec & KPREC_UF0)
+                                rel = (kprec & 0xff) - 0x7f - 0xff;
+                        else
+                                rel = (kprec & 0xff) - 0x7f;
+
+                        if (rel) {
+                                input_report_rel(input_dev, REL_WHEEL, rel);
+                                input_sync(input_dev);
+                        }
+                }
+        }
+
+        if (kpc & KPC_MI) {
+                /* report the status of every button */
+                for (row = 0; row < pdata->nr_rows; row++) {
+                        for (col = 0; col < pdata->nr_cols; col++) {
+                                p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
+                                        1 : 0;
+                                pr_debug("keycode %x - pressed %x\n",
+                                                pdata->keycodes[row][col], p);
+                                input_report_key(input_dev,
+                                                pdata->keycodes[row][col], p);
+                        }
+                }
+                input_sync(input_dev);
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int pxakbd_open(struct input_dev *dev)
+{
+        /* Set keypad control register */
+        KPC |= (KPC_ASACT |
+                KPC_MS_ALL |
+                (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
+                KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
+
+        KPC &= ~KPC_AS;         /* disable automatic scan */
+        KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */
+
+        /* Set rotary count to mid-point value */
+        KPREC = 0x7F;
+
+        /* Enable unit clock */
+        pxa_set_cken(CKEN19_KEYPAD, 1);
+
+        return 0;
+}
+
+static void pxakbd_close(struct input_dev *dev)
+{
+        /* Disable clock unit */
+        pxa_set_cken(CKEN19_KEYPAD, 0);
+}
+
+#ifdef CONFIG_PM
+static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
+
+        /* Save controller status */
+        pdata->reg_kpc = KPC;
+        pdata->reg_kprec = KPREC;
+
+        return 0;
+}
+
+static int pxakbd_resume(struct platform_device *pdev)
+{
+        struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
+        struct input_dev *input_dev = platform_get_drvdata(pdev);
+
+        mutex_lock(&input_dev->mutex);
+
+        if (input_dev->users) {
+                /* Restore controller status */
+                KPC = pdata->reg_kpc;
+                KPREC = pdata->reg_kprec;
+
+                /* Enable unit clock */
+                pxa_set_cken(CKEN19_KEYPAD, 1);
+        }
+
+        mutex_unlock(&input_dev->mutex);
+
+        return 0;
+}
+#else
+#define pxakbd_suspend  NULL
+#define pxakbd_resume   NULL
+#endif
+
+static int __devinit pxakbd_probe(struct platform_device *pdev)
+{
+        struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
+        struct input_dev *input_dev;
+        int i, row, col, error;
+
+        /* Create and register the input driver. */
+        input_dev = input_allocate_device();
+        if (!input_dev) {
+                printk(KERN_ERR "Cannot request keypad device\n");
+                return -ENOMEM;
+        }
+
+        input_dev->name = DRIVER_NAME;
+        input_dev->id.bustype = BUS_HOST;
+        input_dev->open = pxakbd_open;
+        input_dev->close = pxakbd_close;
+        input_dev->cdev.dev = &pdev->dev;
+
+        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
+        input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
+        for (row = 0; row < pdata->nr_rows; row++) {
+                for (col = 0; col < pdata->nr_cols; col++) {
+                        int code = pdata->keycodes[row][col];
+                        if (code > 0)
+                                set_bit(code, input_dev->keybit);
+                }
+        }
+
+        error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, SA_INTERRUPT,
+                            DRIVER_NAME, pdev);
+        if (error) {
+                printk(KERN_ERR "Cannot request keypad IRQ\n");
+                pxa_set_cken(CKEN19_KEYPAD, 0);
+                goto err_free_dev;
+        }
+
+        platform_set_drvdata(pdev, input_dev);
+
+        /* Register the input device */
+        error = input_register_device(input_dev);
+        if (error)
+                goto err_free_irq;
+
+        /* Setup GPIOs. */
+        for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
+                pxa_gpio_mode(pdata->gpio_modes[i]);
+
+        /*
+         * Store rows/cols info into keyboard registers.
+         */
+
+        KPC |= (pdata->nr_rows - 1) << 26;
+        KPC |= (pdata->nr_cols - 1) << 23;
+
+        for (col = 0; col < pdata->nr_cols; col++)
+                KPC |= KPC_MS0 << col;
+
+        return 0;
+
+ err_free_irq:
+        platform_set_drvdata(pdev, NULL);
+        free_irq(IRQ_KEYPAD, pdev);
+ err_free_dev:
+        input_free_device(input_dev);
+        return error;
+}
+
+static int __devexit pxakbd_remove(struct platform_device *pdev)
+{
+        struct input_dev *input_dev = platform_get_drvdata(pdev);
+
+        input_unregister_device(input_dev);
+        free_irq(IRQ_KEYPAD, pdev);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver pxakbd_driver = {
+        .probe          = pxakbd_probe,
+        .remove         = __devexit_p(pxakbd_remove),
+        .suspend        = pxakbd_suspend,
+        .resume         = pxakbd_resume,
+        .driver         = {
+                .name   = DRIVER_NAME,
+        },
+};
+
+static int __init pxakbd_init(void)
+{
+        return platform_driver_register(&pxakbd_driver);
+}
+
+static void __exit pxakbd_exit(void)
+{
+        platform_driver_unregister(&pxakbd_driver);
+}
+
+module_init(pxakbd_init);
+module_exit(pxakbd_exit);
+
+MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
+MODULE_LICENSE("GPL");