Commit b3d6ac3e authored by Thomas Abraham's avatar Thomas Abraham Committed by Kukjin Kim

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
* 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>;
};
};
......@@ -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;
......@@ -246,7 +363,10 @@ static int __devinit samsung_keypad_probe(struct platform_device *pdev)
unsigned int keymap_size;
int error;
pdata = pdev->dev.platform_data;
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");
return -EINVAL;
......@@ -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
......
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