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Commit b3d6ac3e authored by Thomas Abraham's avatar Thomas Abraham Committed by Kukjin Kim
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input: samsung-keypad: Add device tree support



Add device tree based discovery support for Samsung's keypad controller.

Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Donghwa Lee <dh09.lee@samsung.com>
Signed-off-by: default avatarThomas Abraham <thomas.abraham@linaro.org>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 8742e044
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+88 −0
Original line number Diff line number Diff line
* Samsung's Keypad Controller device tree bindings

Samsung's Keypad controller is used to interface a SoC with a matrix-type
keypad device. The keypad controller supports multiple row and column lines.
A key can be placed at each intersection of a unique row and a unique column.
The keypad controller can sense a key-press and key-release and report the
event using a interrupt to the cpu.

Required SoC Specific Properties:
- compatible: should be one of the following
  - "samsung,s3c6410-keypad": For controllers compatible with s3c6410 keypad
    controller.
  - "samsung,s5pv210-keypad": For controllers compatible with s5pv210 keypad
    controller.

- reg: physical base address of the controller and length of memory mapped
  region.

- interrupts: The interrupt number to the cpu.

Required Board Specific Properties:
- samsung,keypad-num-rows: Number of row lines connected to the keypad
  controller.

- samsung,keypad-num-columns: Number of column lines connected to the
  keypad controller.

- row-gpios: List of gpios used as row lines. The gpio specifier for
  this property depends on the gpio controller to which these row lines
  are connected.

- col-gpios: List of gpios used as column lines. The gpio specifier for
  this property depends on the gpio controller to which these column
  lines are connected.

- Keys represented as child nodes: Each key connected to the keypad
  controller is represented as a child node to the keypad controller
  device node and should include the following properties.
  - keypad,row: the row number to which the key is connected.
  - keypad,column: the column number to which the key is connected.
  - linux,code: the key-code to be reported when the key is pressed
    and released.

Optional Properties specific to linux:
- linux,keypad-no-autorepeat: do no enable autorepeat feature.
- linux,keypad-wakeup: use any event on keypad as wakeup event.


Example:
	keypad@100A0000 {
		compatible = "samsung,s5pv210-keypad";
		reg = <0x100A0000 0x100>;
		interrupts = <173>;
		samsung,keypad-num-rows = <2>;
		samsung,keypad-num-columns = <8>;
		linux,input-no-autorepeat;
		linux,input-wakeup;

		row-gpios = <&gpx2 0 3 3 0
			     &gpx2 1 3 3 0>;

		col-gpios = <&gpx1 0 3 0 0
			     &gpx1 1 3 0 0
			     &gpx1 2 3 0 0
			     &gpx1 3 3 0 0
			     &gpx1 4 3 0 0
			     &gpx1 5 3 0 0
			     &gpx1 6 3 0 0
			     &gpx1 7 3 0 0>;

		key_1 {
			keypad,row = <0>;
			keypad,column = <3>;
			linux,code = <2>;
		};

		key_2 {
			keypad,row = <0>;
			keypad,column = <4>;
			linux,code = <3>;
		};

		key_3 {
			keypad,row = <0>;
			keypad,column = <5>;
			linux,code = <4>;
		};
	};
+162 −12
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/sched.h>
#include <plat/keypad.h>

@@ -68,31 +70,26 @@ struct samsung_keypad {
	wait_queue_head_t wait;
	bool stopped;
	int irq;
	enum samsung_keypad_type type;
	unsigned int row_shift;
	unsigned int rows;
	unsigned int cols;
	unsigned int row_state[SAMSUNG_MAX_COLS];
#ifdef CONFIG_OF
	int row_gpios[SAMSUNG_MAX_ROWS];
	int col_gpios[SAMSUNG_MAX_COLS];
#endif
	unsigned short keycodes[];
};

static int samsung_keypad_is_s5pv210(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	enum samsung_keypad_type type =
		platform_get_device_id(pdev)->driver_data;

	return type == KEYPAD_TYPE_S5PV210;
}

static void samsung_keypad_scan(struct samsung_keypad *keypad,
				unsigned int *row_state)
{
	struct device *dev = keypad->input_dev->dev.parent;
	unsigned int col;
	unsigned int val;

	for (col = 0; col < keypad->cols; col++) {
		if (samsung_keypad_is_s5pv210(dev)) {
		if (keypad->type == KEYPAD_TYPE_S5PV210) {
			val = S5PV210_KEYIFCOLEN_MASK;
			val &= ~(1 << col) << 8;
		} else {
@@ -235,6 +232,126 @@ static void samsung_keypad_close(struct input_dev *input_dev)
	samsung_keypad_stop(keypad);
}

#ifdef CONFIG_OF
static struct samsung_keypad_platdata *samsung_keypad_parse_dt(
				struct device *dev)
{
	struct samsung_keypad_platdata *pdata;
	struct matrix_keymap_data *keymap_data;
	uint32_t *keymap, num_rows = 0, num_cols = 0;
	struct device_node *np = dev->of_node, *key_np;
	unsigned int key_count = 0;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		dev_err(dev, "could not allocate memory for platform data\n");
		return NULL;
	}

	of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
	of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
	if (!num_rows || !num_cols) {
		dev_err(dev, "number of keypad rows/columns not specified\n");
		return NULL;
	}
	pdata->rows = num_rows;
	pdata->cols = num_cols;

	keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
	if (!keymap_data) {
		dev_err(dev, "could not allocate memory for keymap data\n");
		return NULL;
	}
	pdata->keymap_data = keymap_data;

	for_each_child_of_node(np, key_np)
		key_count++;

	keymap_data->keymap_size = key_count;
	keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
	if (!keymap) {
		dev_err(dev, "could not allocate memory for keymap\n");
		return NULL;
	}
	keymap_data->keymap = keymap;

	for_each_child_of_node(np, key_np) {
		u32 row, col, key_code;
		of_property_read_u32(key_np, "keypad,row", &row);
		of_property_read_u32(key_np, "keypad,column", &col);
		of_property_read_u32(key_np, "linux,code", &key_code);
		*keymap++ = KEY(row, col, key_code);
	}

	if (of_get_property(np, "linux,input-no-autorepeat", NULL))
		pdata->no_autorepeat = true;
	if (of_get_property(np, "linux,input-wakeup", NULL))
		pdata->wakeup = true;

	return pdata;
}

static void samsung_keypad_parse_dt_gpio(struct device *dev,
				struct samsung_keypad *keypad)
{
	struct device_node *np = dev->of_node;
	int gpio, ret, row, col;

	for (row = 0; row < keypad->rows; row++) {
		gpio = of_get_named_gpio(np, "row-gpios", row);
		keypad->row_gpios[row] = gpio;
		if (!gpio_is_valid(gpio)) {
			dev_err(dev, "keypad row[%d]: invalid gpio %d\n",
					row, gpio);
			continue;
		}

		ret = gpio_request(gpio, "keypad-row");
		if (ret)
			dev_err(dev, "keypad row[%d] gpio request failed\n",
					row);
	}

	for (col = 0; col < keypad->cols; col++) {
		gpio = of_get_named_gpio(np, "col-gpios", col);
		keypad->col_gpios[col] = gpio;
		if (!gpio_is_valid(gpio)) {
			dev_err(dev, "keypad column[%d]: invalid gpio %d\n",
					col, gpio);
			continue;
		}

		ret = gpio_request(gpio, "keypad-col");
		if (ret)
			dev_err(dev, "keypad column[%d] gpio request failed\n",
					col);
	}
}

static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
{
	int cnt;

	for (cnt = 0; cnt < keypad->rows; cnt++)
		if (gpio_is_valid(keypad->row_gpios[cnt]))
			gpio_free(keypad->row_gpios[cnt]);

	for (cnt = 0; cnt < keypad->cols; cnt++)
		if (gpio_is_valid(keypad->col_gpios[cnt]))
			gpio_free(keypad->col_gpios[cnt]);
}
#else
static
struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
{
	return NULL;
}

static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
{
}
#endif

static int __devinit samsung_keypad_probe(struct platform_device *pdev)
{
	const struct samsung_keypad_platdata *pdata;
@@ -246,6 +363,9 @@ static int __devinit samsung_keypad_probe(struct platform_device *pdev)
	unsigned int keymap_size;
	int error;

	if (pdev->dev.of_node)
		pdata = samsung_keypad_parse_dt(&pdev->dev);
	else
		pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(&pdev->dev, "no platform data defined\n");
@@ -303,6 +423,16 @@ static int __devinit samsung_keypad_probe(struct platform_device *pdev)
	keypad->cols = pdata->cols;
	init_waitqueue_head(&keypad->wait);

	if (pdev->dev.of_node) {
#ifdef CONFIG_OF
		samsung_keypad_parse_dt_gpio(&pdev->dev, keypad);
		keypad->type = of_device_is_compatible(pdev->dev.of_node,
					"samsung,s5pv210-keypad");
#endif
	} else {
		keypad->type = platform_get_device_id(pdev)->driver_data;
	}

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->dev.parent = &pdev->dev;
@@ -343,12 +473,19 @@ static int __devinit samsung_keypad_probe(struct platform_device *pdev)

	device_init_wakeup(&pdev->dev, pdata->wakeup);
	platform_set_drvdata(pdev, keypad);

	if (pdev->dev.of_node) {
		devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
		devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
		devm_kfree(&pdev->dev, (void *)pdata);
	}
	return 0;

err_free_irq:
	free_irq(keypad->irq, keypad);
err_put_clk:
	clk_put(keypad->clk);
	samsung_keypad_dt_gpio_free(keypad);
err_unmap_base:
	iounmap(keypad->base);
err_free_mem:
@@ -374,6 +511,7 @@ static int __devexit samsung_keypad_remove(struct platform_device *pdev)
	free_irq(keypad->irq, keypad);

	clk_put(keypad->clk);
	samsung_keypad_dt_gpio_free(keypad);

	iounmap(keypad->base);
	kfree(keypad);
@@ -447,6 +585,17 @@ static const struct dev_pm_ops samsung_keypad_pm_ops = {
};
#endif

#ifdef CONFIG_OF
static const struct of_device_id samsung_keypad_dt_match[] = {
	{ .compatible = "samsung,s3c6410-keypad" },
	{ .compatible = "samsung,s5pv210-keypad" },
	{},
};
MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
#else
#define samsung_keypad_dt_match NULL
#endif

static struct platform_device_id samsung_keypad_driver_ids[] = {
	{
		.name		= "samsung-keypad",
@@ -465,6 +614,7 @@ static struct platform_driver samsung_keypad_driver = {
	.driver		= {
		.name	= "samsung-keypad",
		.owner	= THIS_MODULE,
		.of_match_table = samsung_keypad_dt_match,
#ifdef CONFIG_PM
		.pm	= &samsung_keypad_pm_ops,
#endif