Input: omap4-keypad - add device tree support

Add device tree support for omap4 keypad driver and update the
Documentation with omap4 keypad device tree binding information.

Tested on omap4430 sdp.

Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

2 files changed, 118 insertions, 40 deletions

diff --git a/Documentation/devicetree/bindings/input/omap-keypad.txt b/Documentation/devicetree/bindings/input/omap-keypad.txt
new file mode 100644
index 000000000000..f2fa5e10493d
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/omap-keypad.txt
@@ -0,0 +1,31 @@
+* TI's Keypad Controller device tree bindings
+
+TI'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
+   - "ti,omap4-keypad": For controllers compatible with omap4 keypad
+      controller.
+
+Required Board Specific Properties, in addition to those specified by
+the shared matrix-keyboard bindings:
+- keypad,num-rows: Number of row lines connected to the keypad
+  controller.
+
+- keypad,num-columns: Number of column lines connected to the
+  keypad controller.
+
+Optional Properties specific to linux:
+- linux,keypad-no-autorepeat: do no enable autorepeat feature.
+
+Example:
+        keypad@4ae1c000{
+                compatible = "ti,omap4-keypad";
+                keypad,num-rows = <2>;
+                keypad,num-columns = <8>;
+                linux,keypad-no-autorepeat;
+        };
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
index aed5f6999ce2..c05f98c41410 100644
--- a/drivers/input/keyboard/omap4-keypad.c
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -27,6 +27,7 @@
 #include <linux/platform_device.h>
 #include <linux/errno.h>
 #include <linux/io.h>
+#include <linux/of.h>
 #include <linux/input.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
@@ -84,8 +85,9 @@ struct omap4_keypad {
         u32 reg_offset;
         u32 irqreg_offset;
         unsigned int row_shift;
+        bool no_autorepeat;
         unsigned char key_state[8];
-        unsigned short keymap[];
+        unsigned short *keymap;
 };
 
 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
@@ -208,25 +210,51 @@ static void omap4_keypad_close(struct input_dev *input)
         pm_runtime_put_sync(input->dev.parent);
 }
 
+#ifdef CONFIG_OF
+static int __devinit omap4_keypad_parse_dt(struct device *dev,
+                                           struct omap4_keypad *keypad_data)
+{
+        struct device_node *np = dev->of_node;
+
+        if (!np) {
+                dev_err(dev, "missing DT data");
+                return -EINVAL;
+        }
+
+        of_property_read_u32(np, "keypad,num-rows", &keypad_data->rows);
+        of_property_read_u32(np, "keypad,num-columns", &keypad_data->cols);
+        if (!keypad_data->rows || !keypad_data->cols) {
+                dev_err(dev, "number of keypad rows/columns not specified\n");
+                return -EINVAL;
+        }
+
+        if (of_get_property(np, "linux,input-no-autorepeat", NULL))
+                keypad_data->no_autorepeat = true;
+
+        return 0;
+}
+#else
+static inline int omap4_keypad_parse_dt(struct device *dev,
+                                        struct omap4_keypad *keypad_data)
+{
+        return -ENOSYS;
+}
+#endif
+
 static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 {
-        const struct omap4_keypad_platform_data *pdata;
+        const struct omap4_keypad_platform_data *pdata =
+                                dev_get_platdata(&pdev->dev);
+        const struct matrix_keymap_data *keymap_data =
+                                pdata ? pdata->keymap_data : NULL;
         struct omap4_keypad *keypad_data;
         struct input_dev *input_dev;
         struct resource *res;
-        resource_size_t size;
-        unsigned int row_shift, max_keys;
+        unsigned int max_keys;
         int rev;
         int irq;
         int error;
 
-        /* platform data */
-        pdata = pdev->dev.platform_data;
-        if (!pdata) {
-                dev_err(&pdev->dev, "no platform data defined\n");
-                return -EINVAL;
-        }
-
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res) {
                 dev_err(&pdev->dev, "no base address specified\n");
@@ -239,25 +267,24 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
                 return -EINVAL;
         }
 
-        if (!pdata->keymap_data) {
-                dev_err(&pdev->dev, "no keymap data defined\n");
-                return -EINVAL;
-        }
-
-        row_shift = get_count_order(pdata->cols);
-        max_keys = pdata->rows << row_shift;
-
-        keypad_data = kzalloc(sizeof(struct omap4_keypad) +
-                                max_keys * sizeof(keypad_data->keymap[0]),
-                              GFP_KERNEL);
+        keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
         if (!keypad_data) {
                 dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
                 return -ENOMEM;
         }
 
-        size = resource_size(res);
+        keypad_data->irq = irq;
+
+        if (pdata) {
+                keypad_data->rows = pdata->rows;
+                keypad_data->cols = pdata->cols;
+        } else {
+                error = omap4_keypad_parse_dt(&pdev->dev, keypad_data);
+                if (error)
+                        return error;
+        }
 
-        res = request_mem_region(res->start, size, pdev->name);
+        res = request_mem_region(res->start, resource_size(res), pdev->name);
         if (!res) {
                 dev_err(&pdev->dev, "can't request mem region\n");
                 error = -EBUSY;
@@ -271,15 +298,11 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
                 goto err_release_mem;
         }
 
-        keypad_data->irq = irq;
-        keypad_data->row_shift = row_shift;
-        keypad_data->rows = pdata->rows;
-        keypad_data->cols = pdata->cols;
 
         /*
-        * Enable clocks for the keypad module so that we can read
-        * revision register.
-        */
+         * Enable clocks for the keypad module so that we can read
+         * revision register.
+         */
         pm_runtime_enable(&pdev->dev);
         error = pm_runtime_get_sync(&pdev->dev);
         if (error) {
@@ -322,19 +345,30 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
         input_dev->open = omap4_keypad_open;
         input_dev->close = omap4_keypad_close;
 
-        error = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
-                                           pdata->rows, pdata->cols,
+        input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+        if (!keypad_data->no_autorepeat)
+                __set_bit(EV_REP, input_dev->evbit);
+
+        input_set_drvdata(input_dev, keypad_data);
+
+        keypad_data->row_shift = get_count_order(keypad_data->cols);
+        max_keys = keypad_data->rows << keypad_data->row_shift;
+        keypad_data->keymap = kzalloc(max_keys * sizeof(keypad_data->keymap[0]),
+                                      GFP_KERNEL);
+        if (!keypad_data->keymap) {
+                dev_err(&pdev->dev, "Not enough memory for keymap\n");
+                error = -ENOMEM;
+                goto err_free_input;
+        }
+
+        error = matrix_keypad_build_keymap(keymap_data, NULL,
+                                           keypad_data->rows, keypad_data->cols,
                                            keypad_data->keymap, input_dev);
         if (error) {
                 dev_err(&pdev->dev, "failed to build keymap\n");
-                goto err_free_input;
+                goto err_free_keymap;
         }
 
-        __set_bit(EV_REP, input_dev->evbit);
-        input_set_capability(input_dev, EV_MSC, MSC_SCAN);
-
-        input_set_drvdata(input_dev, keypad_data);
-
         error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
                              IRQF_TRIGGER_RISING,
                              "omap4-keypad", keypad_data);
@@ -357,6 +391,8 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
 err_pm_disable:
         pm_runtime_disable(&pdev->dev);
         free_irq(keypad_data->irq, keypad_data);
+err_free_keymap:
+        kfree(keypad_data->keymap);
 err_free_input:
         input_free_device(input_dev);
 err_pm_put_sync:
@@ -364,7 +400,7 @@ err_pm_put_sync:
 err_unmap:
         iounmap(keypad_data->base);
 err_release_mem:
-        release_mem_region(res->start, size);
+        release_mem_region(res->start, resource_size(res));
 err_free_keypad:
         kfree(keypad_data);
         return error;
@@ -386,18 +422,29 @@ static int __devexit omap4_keypad_remove(struct platform_device *pdev)
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         release_mem_region(res->start, resource_size(res));
 
+        kfree(keypad_data->keymap);
         kfree(keypad_data);
+
         platform_set_drvdata(pdev, NULL);
 
         return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id omap_keypad_dt_match[] = {
+        { .compatible = "ti,omap4-keypad" },
+        {},
+};
+MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
+#endif
+
 static struct platform_driver omap4_keypad_driver = {
         .probe          = omap4_keypad_probe,
         .remove         = __devexit_p(omap4_keypad_remove),
         .driver         = {
                 .name   = "omap4-keypad",
                 .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(omap_keypad_dt_match),
         },
 };
 module_platform_driver(omap4_keypad_driver);