[PATCH v5 2/2] input: samsung-keypad: Add device tree support
Thomas Abraham
thomas.abraham at linaro.org
Mon Oct 10 12:29:57 EDT 2011
Add device tree based discovery support for Samsung's keypad controller.
Cc: Joonyoung Shim <jy0922.shim at samsung.com>
Cc: Donghwa Lee <dh09.lee at samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham at linaro.org>
Acked-by: Grant Likely <grant.likely at secretlab.ca>
---
.../devicetree/bindings/input/samsung-keypad.txt | 88 ++++++++++
drivers/input/keyboard/samsung-keypad.c | 174 ++++++++++++++++++--
2 files changed, 250 insertions(+), 12 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/samsung-keypad.txt
diff --git a/Documentation/devicetree/bindings/input/samsung-keypad.txt b/Documentation/devicetree/bindings/input/samsung-keypad.txt
new file mode 100644
index 0000000..ce3e394
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/samsung-keypad.txt
@@ -0,0 +1,88 @@
+* 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 at 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>;
+ };
+ };
diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
index f689f49..8a0060c 100644
--- a/drivers/input/keyboard/samsung-keypad.c
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -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
--
1.6.6.rc2
More information about the linux-arm-kernel
mailing list