1 files changed, 274 insertions, 0 deletions

diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
new file mode 100644
index 0000000..06c1d5a
--- /dev/null
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -0,0 +1,274 @@
+/*
+ * linux/drivers/input/keyboard/pxa27x_keypad.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 <linux/clk.h>
+#include <linux/err.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_keypad.h>
+
+#define DRIVER_NAME		"pxa27x-keypad"
+
+#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 struct clk *pxa27x_keypad_clk;
+
+static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
+{
+	struct platform_device *pdev = dev_id;
+	struct pxa27x_keypad_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 pxa27x_keypad_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 */
+	clk_enable(pxa27x_keypad_clk);
+
+	return 0;
+}
+
+static void pxa27x_keypad_close(struct input_dev *dev)
+{
+	/* Disable clock unit */
+	clk_disable(pxa27x_keypad_clk);
+}
+
+#ifdef CONFIG_PM
+static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
+
+	/* Save controller status */
+	pdata->reg_kpc = KPC;
+	pdata->reg_kprec = KPREC;
+
+	return 0;
+}
+
+static int pxa27x_keypad_resume(struct platform_device *pdev)
+{
+	struct pxa27x_keypad_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 */
+		clk_disable(pxa27x_keypad_clk);
+		clk_enable(pxa27x_keypad_clk);
+	}
+
+	mutex_unlock(&input_dev->mutex);
+
+	return 0;
+}
+#else
+#define pxa27x_keypad_suspend	NULL
+#define pxa27x_keypad_resume	NULL
+#endif
+
+static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
+{
+	struct pxa27x_keypad_platform_data *pdata = pdev->dev.platform_data;
+	struct input_dev *input_dev;
+	int i, row, col, error;
+
+	pxa27x_keypad_clk = clk_get(&pdev->dev, "KBDCLK");
+	if (IS_ERR(pxa27x_keypad_clk)) {
+		error = PTR_ERR(pxa27x_keypad_clk);
+		goto err_clk;
+	}
+
+	/* Create and register the input driver. */
+	input_dev = input_allocate_device();
+	if (!input_dev) {
+		printk(KERN_ERR "Cannot request keypad device\n");
+		error = -ENOMEM;
+		goto err_alloc;
+	}
+
+	input_dev->name = DRIVER_NAME;
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->open = pxa27x_keypad_open;
+	input_dev->close = pxa27x_keypad_close;
+	input_dev->dev.parent = &pdev->dev;
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
+		BIT_MASK(EV_REL);
+	input_dev->relbit[BIT_WORD(REL_WHEEL)] = BIT_MASK(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, pxa27x_keypad_irq_handler, IRQF_DISABLED,
+			    DRIVER_NAME, pdev);
+	if (error) {
+		printk(KERN_ERR "Cannot request keypad IRQ\n");
+		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);
+ err_alloc:
+	clk_put(pxa27x_keypad_clk);
+ err_clk:
+	return error;
+}
+
+static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
+{
+	struct input_dev *input_dev = platform_get_drvdata(pdev);
+
+	input_unregister_device(input_dev);
+	free_irq(IRQ_KEYPAD, pdev);
+	clk_put(pxa27x_keypad_clk);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver pxa27x_keypad_driver = {
+	.probe		= pxa27x_keypad_probe,
+	.remove		= __devexit_p(pxa27x_keypad_remove),
+	.suspend	= pxa27x_keypad_suspend,
+	.resume		= pxa27x_keypad_resume,
+	.driver		= {
+		.name	= DRIVER_NAME,
+	},
+};
+
+static int __init pxa27x_keypad_init(void)
+{
+	return platform_driver_register(&pxa27x_keypad_driver);
+}
+
+static void __exit pxa27x_keypad_exit(void)
+{
+	platform_driver_unregister(&pxa27x_keypad_driver);
+}
+
+module_init(pxa27x_keypad_init);
+module_exit(pxa27x_keypad_exit);
+
+MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
+MODULE_LICENSE("GPL");