Re: [PATCHv4 1/2] drivers: input: keypad: Add device tree support

Russell King - ARM Linux
2012-04-25T10:53:07Z

I think you and Roland Stigge need to put your heads together and come
up with a common DT binding for matrix keypad devices, rather than
inventing N different platform specific bindings.

On Wed, Apr 25, 2012 at 02:56:43PM +0530, Sourav Poddar wrote:
> Update the Documentation with omap4 keypad device tree
> binding information.
> Add device tree support for omap4 keypad driver.
>
> Tested on omap4430 sdp with 3.4-rc3.
>
> Cc: Stephen Warren <swarren@wwwdotorg.org>
> Cc: Benoit Cousson <b-cousson@ti.com>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: Grant Likely <grant.likely@secretlab.ca>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: Randy Dunlap <rdunlap@xenotime.net>
> Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
> ---
> v3->v4: Fix stephen warren's comment
> - Made use of the (linux, keymap) bindings as
> described in matrix-keyboard binding documentation.
>
> .../devicetree/bindings/input/omap-keypad.txt | 31 +++++
> drivers/input/keyboard/omap4-keypad.c | 118 ++++++++++++++++----
> 2 files changed, 126 insertions(+), 23 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/input/omap-keypad.txt
>
> diff --git a/Documentation/devicetree/bindings/input/omap-keypad.txt b/Documentation/devicetree/bindings/input/omap-keypad.txt
> new file mode 100644
> index 0000000..722425b
> --- /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 e809ac0..bce300e 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>
> @@ -70,6 +71,7 @@
>
> struct omap4_keypad {
> struct input_dev *input;
> + struct matrix_keymap_data *keymap_data;
>
> void __iomem *base;
> int irq;
> @@ -77,6 +79,7 @@ struct omap4_keypad {
> unsigned int rows;
> unsigned int cols;
> unsigned int row_shift;
> + bool no_autorepeat;
> unsigned char key_state[8];
> unsigned short keymap[];
> };
> @@ -174,24 +177,101 @@ static void omap4_keypad_close(struct input_dev *input)
> pm_runtime_put_sync(input->dev.parent);
> }
>
> +static struct omap4_keypad *omap_keypad_parse_dt(struct device *dev)
> +{
> + struct matrix_keymap_data *keymap_data;
> + struct device_node *np = dev->of_node;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
> + uint32_t *keymap;
> + int proplen = 0, i;
> + const __be32 *prop = of_get_property(np, "linux,keymap", &proplen);
> +
> + 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;
> + }
> + keypad_data->keymap_data = keymap_data;
> +
> + keymap_data->keymap_size = proplen / sizeof(u32);
> +
> + keymap = devm_kzalloc(dev,
> + sizeof(uint32_t) * keymap_data->keymap_size, GFP_KERNEL);
> + if (!keymap) {
> + dev_err(dev, "could not allocate memory for keymap\n");
> + return NULL;
> + }
> + keypad_data->keymap_data->keymap = keymap;
> +
> + for (i = 0; i < keymap_data->keymap_size; i++) {
> + u32 tmp = be32_to_cpup(prop+i);
> + int key_code, row, col;
> +
> + row = (tmp >> 24) & 0xff;
> + col = (tmp >> 16) & 0xff;
> + key_code = tmp & 0xffff;
> + *keymap++ = KEY(row, col, key_code);
> + }
> +
> + if (of_get_property(np, "linux,input-no-autorepeat", NULL))
> + keypad_data->no_autorepeat = true;
> +
> + return keypad_data;
> +}
> +
> static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> {
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> const struct omap4_keypad_platform_data *pdata;
> 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 row_shift = 0, max_keys = 0;
> + uint32_t num_rows = 0, num_cols = 0;
> int irq;
> int error;
>
> /* platform data */
> pdata = pdev->dev.platform_data;
> - if (!pdata) {
> + if (np) {
> + of_property_read_u32(np, "keypad,num-rows", &num_rows);
> + of_property_read_u32(np, "keypad,num-columns", &num_cols);
> + if (!num_rows || !num_cols) {
> + dev_err(&pdev->dev, "number of keypad rows/columns not specified\n");
> + return -EINVAL;
> + }
> + } else if (pdata) {
> + num_rows = pdata->rows;
> + num_cols = pdata->cols;
> + } else {
> dev_err(&pdev->dev, "no platform data defined\n");
> return -EINVAL;
> }
>
> + row_shift = get_count_order(num_cols);
> + max_keys = num_rows << row_shift;
> +
> + keypad_data = devm_kzalloc(dev, sizeof(struct omap4_keypad) +
> + max_keys * sizeof(keypad_data->keymap[0]),
> + GFP_KERNEL);
> +
> + if (!keypad_data) {
> + dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + platform_set_drvdata(pdev, keypad_data);
> +
> + if (np) {
> + keypad_data = omap_keypad_parse_dt(&pdev->dev);
> + } else {
> + keypad_data->keymap_data =
> + (struct matrix_keymap_data *)pdata->keymap_data;
> + }
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res) {
> dev_err(&pdev->dev, "no base address specified\n");
> @@ -204,22 +284,6 @@ 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);
> - if (!keypad_data) {
> - dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
> - return -ENOMEM;
> - }
> -
> size = resource_size(res);
>
> res = request_mem_region(res->start, size, pdev->name);
> @@ -236,10 +300,10 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> goto err_release_mem;
> }
>
> + keypad_data->rows = num_rows;
> + keypad_data->cols = num_cols;
> keypad_data->irq = irq;
> keypad_data->row_shift = row_shift;
> - keypad_data->rows = pdata->rows;
> - keypad_data->cols = pdata->cols;
>
> /* input device allocation */
> keypad_data->input = input_dev = input_allocate_device();
> @@ -263,13 +327,15 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> input_dev->keycodemax = max_keys;
>
> __set_bit(EV_KEY, input_dev->evbit);
> - __set_bit(EV_REP, input_dev->evbit);
> +
> + if (!keypad_data->no_autorepeat)
> + __set_bit(EV_REP, input_dev->evbit);
>
> input_set_capability(input_dev, EV_MSC, MSC_SCAN);
>
> input_set_drvdata(input_dev, keypad_data);
>
> - matrix_keypad_build_keymap(pdata->keymap_data, row_shift,
> + matrix_keypad_build_keymap(keypad_data->keymap_data, row_shift,
> input_dev->keycode, input_dev->keybit);
>
> error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
> @@ -288,7 +354,6 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> goto err_pm_disable;
> }
>
> - platform_set_drvdata(pdev, keypad_data);
> return 0;
>
> err_pm_disable:
> @@ -327,12 +392,19 @@ static int __devexit omap4_keypad_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static const struct of_device_id omap_keypad_dt_match[] = {
> + { .compatible = "ti,omap4-keypad" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);
> +
> 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);
> --
> 1.7.1
>
>
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