Input: add support for PXA27x keyboard controller
authorRodolfo Giometti <giometti@enneenne.com>
Fri, 16 Mar 2007 04:58:52 +0000 (00:58 -0400)
committerDmitry Torokhov <dtor@insightbb.com>
Fri, 16 Mar 2007 04:58:52 +0000 (00:58 -0400)
Signed-off-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
drivers/input/keyboard/Kconfig
drivers/input/keyboard/Makefile
drivers/input/keyboard/pxa27x_keyboard.c [new file with mode: 0644]
include/asm-arm/arch-pxa/pxa27x_keyboard.h [new file with mode: 0644]

index 64509689fa6514827bccff60e62f24abe8df873f..be65e50e7a337cc3a16c129e6877be4045cd2f46 100644 (file)
@@ -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
index 586a0fe53be604bc1e67c6001b98df90e99b7e2f..fc1d1f263167d0e555bdf298c79ee6c16dcb0e15 100644 (file)
@@ -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 (file)
index 0000000..1a2afbf
--- /dev/null
@@ -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");
diff --git a/include/asm-arm/arch-pxa/pxa27x_keyboard.h b/include/asm-arm/arch-pxa/pxa27x_keyboard.h
new file mode 100644 (file)
index 0000000..3aaff92
--- /dev/null
@@ -0,0 +1,13 @@
+#define PXAKBD_MAXROW          8
+#define PXAKBD_MAXCOL          8
+
+struct pxa27x_keyboard_platform_data {
+       int nr_rows, nr_cols;
+       int keycodes[PXAKBD_MAXROW][PXAKBD_MAXCOL];
+       int gpio_modes[PXAKBD_MAXROW + PXAKBD_MAXCOL];
+
+#ifdef CONFIG_PM
+       u32 reg_kpc;
+       u32 reg_kprec;
+#endif
+};