Input: add support for PXA27x keyboard controller
Signed-off-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/keyboard/pxa27x_keyboard.c b/drivers/input/keyboard/pxa27x_keyboard.c
new file mode 100644
index 0000000..1a2afbf
--- /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");