[PATCH 2/7] input: add driver for tnetv107x on-chip keypad controller

[Cyril Chemparathy <cyril@ti.com>]

This patch adds support for tnetv107x's on-chip keypad controller.

Signed-off-by: Cyril Chemparathy <cyril@ti.com>
---
 drivers/input/keyboard/Kconfig            |    9 +
 drivers/input/keyboard/Makefile           |    1 +
 drivers/input/keyboard/tnetv107x-keypad.c |  324 +++++++++++++++++++++++++++++
 3 files changed, 334 insertions(+), 0 deletions(-)
 create mode 100644 drivers/input/keyboard/tnetv107x-keypad.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 9cc488d..0ea8648 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -457,4 +457,13 @@ config KEYBOARD_W90P910
 	  To compile this driver as a module, choose M here: the
 	  module will be called w90p910_keypad.
 
+config KEYBOARD_TNETV107X
+	tristate "TI TNETV107X keypad support"
+	depends on ARCH_DAVINCI_TNETV107X
+	help
+	  Say Y here if you want to use the TNETV107X keypad.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tnetv107x-keypad.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 504b591..63261b0 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o
 obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o
 obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o
 obj-$(CONFIG_KEYBOARD_W90P910)		+= w90p910_keypad.o
+obj-$(CONFIG_KEYBOARD_TNETV107X)	+= tnetv107x-keypad.o
diff --git a/drivers/input/keyboard/tnetv107x-keypad.c b/drivers/input/keyboard/tnetv107x-keypad.c
new file mode 100644
index 0000000..5039164
--- /dev/null
+++ b/drivers/input/keyboard/tnetv107x-keypad.c
@@ -0,0 +1,324 @@
+/*
+ * Texas Instruments TNETV107X Keypad Driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <mach/tnetv107x.h>
+
+#define KEYPAD_ROWS		9
+#define KEYPAD_COLS		9
+
+struct keypad_regs {
+	u32	rev;
+	u32	mode;
+	u32	mask;
+	u32	pol;
+	u32	dclock;
+	u32	rclock;
+	u32	stable_cnt;
+	u32	in_en;
+	u32	out;
+	u32	out_en;
+	u32	in;
+	u32	lock;
+	u32	pres[3];
+};
+
+#define keypad_read(kp, reg)		__raw_readl(&(kp)->regs->reg)
+#define keypad_write(kp, reg, val)	__raw_writel(val, &(kp)->regs->reg)
+
+struct keypad_data {
+	struct tnetv107x_keypad_data	data;
+	struct input_dev		*input_dev;
+	struct resource			*res;
+	struct keypad_regs __iomem	*regs;
+	struct clk			*clk;
+	struct device			*dev;
+	u32				irq_press;
+	u32				irq_release;
+	u32				curr_keys[3];
+	u32				prev_keys[3];
+};
+
+static void handle_change(struct keypad_data *kp)
+{
+	int bit, i;
+
+	for (bit = 0; bit < (KEYPAD_ROWS * KEYPAD_COLS); bit++) {
+		int idx		= bit / 32;
+		u32 mask	= 1 << (bit % 32);
+		u32 curr	= kp->curr_keys[idx] & mask;
+		u32 prev	= kp->prev_keys[idx] & mask;
+		int row		= bit / KEYPAD_COLS;
+		int col		= bit % KEYPAD_COLS;
+		int ofs		= row * kp->data.cols + col;
+
+		if (col >= kp->data.cols || row >= kp->data.rows)
+			continue;
+
+		if (curr && !prev) {
+			/* Report key press */
+			if (kp->data.keynames && kp->data.keynames[ofs])
+				dev_dbg(kp->dev, "%s (%d) pressed\n",
+					kp->data.keynames[ofs], ofs);
+			input_report_key(kp->input_dev,
+					 kp->data.keymap[ofs], 1);
+		} else if (!curr && prev) {
+			/* Report key release */
+			if (kp->data.keynames && kp->data.keynames[ofs])
+				dev_dbg(kp->dev, "%s (%d) released\n",
+					kp->data.keynames[ofs], ofs);
+			input_report_key(kp->input_dev,
+					 kp->data.keymap[ofs], 0);
+		}
+	}
+
+	/* Update shadow copy */
+	for (i = 0; i < 3; i++)
+		kp->prev_keys[i] = kp->curr_keys[i];
+
+	input_sync(kp->input_dev);
+}
+
+static irqreturn_t keypad_irq_press(int irq, void *data)
+{
+	struct keypad_data *kp = (struct keypad_data *)data;
+	int i;
+
+	for (i = 0; i < 3; i++)
+		kp->curr_keys[i] = keypad_read(kp, pres[i]);
+	handle_change(kp);
+	keypad_write(kp, lock, 0); /* Allow hardware updates */
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t keypad_irq_release(int irq, void *data)
+{
+	struct keypad_data *kp = (struct keypad_data *)data;
+	int i;
+
+	/* Hardware says all keys have been released */
+	for (i = 0; i < 3; i++)
+		kp->curr_keys[i] = 0;
+	handle_change(kp);
+	return IRQ_HANDLED;
+}
+
+static int tnetv107x_keypad_probe(struct platform_device *pdev)
+{
+	struct tnetv107x_keypad_data *pdata = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
+	struct keypad_data *kp;
+	int i, ret = 0;
+	u32 rev = 0;
+
+	ret = -EINVAL;
+	if (!pdata) {
+		dev_err(dev, "cannot find device data\n");
+		return ret;
+	}
+
+	ret = -ENOMEM;
+	kp = kzalloc(sizeof(struct keypad_data), GFP_KERNEL);
+	if (!kp) {
+		dev_err(dev, "cannot allocate device info\n");
+		return ret;
+	}
+
+	dev_set_drvdata(dev, kp);
+	kp->data = *pdata;
+	kp->dev = dev;
+
+	ret = -ENOMEM;
+	kp->input_dev = input_allocate_device();
+	if (!kp->input_dev) {
+		dev_err(dev, "cannot allocate input device\n");
+		goto error0;
+	}
+
+	ret = -ENODEV;
+	kp->irq_press   = platform_get_irq_byname(pdev, "press");
+	kp->irq_release = platform_get_irq_byname(pdev, "release");
+	if (kp->irq_press < 0 || kp->irq_release < 0) {
+		dev_err(dev, "cannot determine device interrupts\n");
+		goto error1;
+	}
+
+	ret = -ENODEV;
+	kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!kp->res) {
+		dev_err(dev, "cannot determine register area\n");
+		goto error1;
+	}
+
+	ret = -EINVAL;
+	if (!request_mem_region(kp->res->start, resource_size(kp->res),
+				pdev->name)) {
+		dev_err(dev, "cannot claim register memory\n");
+		goto error1;
+	}
+
+	ret = -ENOMEM;
+	kp->regs = ioremap(kp->res->start, resource_size(kp->res));
+	if (!kp->regs) {
+		dev_err(dev, "cannot map register memory\n");
+		goto error2;
+	}
+
+	ret = -EINVAL;
+	kp->clk = clk_get(dev, NULL);
+	if (!kp->clk) {
+		dev_err(dev, "cannot claim device clock\n");
+		goto error3;
+	}
+	clk_enable(kp->clk);
+
+	/* Initialize device registers */
+	keypad_write(kp, mode, 0);
+	keypad_write(kp, mask, ~((((1 << kp->data.rows)-1) << 9) |
+			   (((1 << kp->data.cols)-1))));
+	keypad_write(kp, pol, 0x3ffff);
+	keypad_write(kp, dclock, kp->data.debounce);
+	keypad_write(kp, rclock, 4*kp->data.debounce);
+	keypad_write(kp, stable_cnt, kp->data.stable);
+
+	/* Enable Input */
+	keypad_write(kp, in_en, 0);
+	mdelay(1);
+	keypad_write(kp, in_en, 1);
+
+	ret = request_irq(kp->irq_press, keypad_irq_press, 0,
+			  "keypad-press", kp);
+	if (ret < 0) {
+		dev_err(dev, "Could not allocate keypad press key irq\n");
+		goto error4;
+	}
+
+	ret = request_irq(kp->irq_release, keypad_irq_release, 0,
+			  "keypad-release", kp);
+	if (ret < 0) {
+		dev_err(dev, "Could not allocate keypad release key irq\n");
+		goto error5;
+	}
+
+	set_bit(EV_KEY, kp->input_dev->evbit);
+	for (i = 0; i < kp->data.keymap_size; i++)
+		set_bit(kp->data.keymap[i] & KEY_MAX, kp->input_dev->keybit);
+
+	kp->input_dev->name = "tnetv107x-keypad";
+	kp->input_dev->phys = "tnetv107x-keypad/input0";
+	kp->input_dev->dev.parent = &pdev->dev;
+	kp->input_dev->id.bustype = BUS_HOST;
+	kp->input_dev->id.vendor = 0x0001;
+
+	rev = keypad_read(kp, rev);
+	kp->input_dev->id.product = ((rev >>  8) & 0x07);
+	kp->input_dev->id.version = ((rev >> 16) & 0xfff);
+
+	kp->input_dev->keycode = kp->data.keymap;
+	kp->input_dev->keycodesize = sizeof(int);
+	kp->input_dev->keycodemax = kp->data.keymap_size;
+	ret = input_register_device(kp->input_dev);
+	if (ret < 0) {
+		dev_err(dev, "Could not register input device\n");
+		goto error6;
+	}
+
+	dev_info(dev, "registered keypad device\n");
+	return 0;
+
+error6:
+	free_irq(kp->irq_release, kp);
+error5:
+	free_irq(kp->irq_press, kp);
+error4:
+	clk_disable(kp->clk);
+	clk_put(kp->clk);
+error3:
+	iounmap(kp->regs);
+error2:
+	release_mem_region(kp->res->start, resource_size(kp->res));
+error1:
+	input_free_device(kp->input_dev);
+error0:
+	platform_set_drvdata(pdev, NULL);
+	kfree(kp);
+	return ret;
+}
+
+static int tnetv107x_keypad_remove(struct platform_device *pdev)
+{
+	struct keypad_data *kp = dev_get_drvdata(&pdev->dev);
+
+	if (kp) {
+		input_unregister_device(kp->input_dev);
+		free_irq(kp->irq_release, kp);
+		free_irq(kp->irq_press, kp);
+		clk_disable(kp->clk);
+		clk_put(kp->clk);
+		iounmap(kp->regs);
+		release_mem_region(kp->res->start, resource_size(kp->res));
+		input_free_device(kp->input_dev);
+		platform_set_drvdata(pdev, NULL);
+		kfree(kp);
+	}
+	return 0;
+}
+
+static int tnetv107x_keypad_suspend(struct platform_device *pdev,
+		pm_message_t state)
+{
+	/* Nothing yet */
+	return 0;
+}
+
+static int tnetv107x_keypad_resume(struct platform_device *pdev)
+{
+	/* Nothing yet */
+	return 0;
+}
+
+static struct platform_driver tnetv107x_keypad_driver = {
+	.probe		= tnetv107x_keypad_probe,
+	.remove		= tnetv107x_keypad_remove,
+	.suspend	= tnetv107x_keypad_suspend,
+	.resume		= tnetv107x_keypad_resume,
+	.driver.name	= "tnetv107x-keypad",
+};
+
+static int __init tnetv107x_keypad_init(void)
+{
+	return platform_driver_register(&tnetv107x_keypad_driver);
+}
+
+static void __exit tnetv107x_keypad_exit(void)
+{
+	platform_driver_unregister(&tnetv107x_keypad_driver);
+}
+
+module_init(tnetv107x_keypad_init);
+module_exit(tnetv107x_keypad_exit);
+
+MODULE_AUTHOR("Cyril Chemparathy");
+MODULE_DESCRIPTION("TNETV107X Keypad Driver");
+MODULE_LICENSE("GPL");
-- 
1.7.0.4