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Message-ID: <CAKdam56W025H_0MKMcX_7h61n7FQ7ZEbAG_SYWOU5Tj=nRDbEQ@mail.gmail.com>
Date: Tue, 19 Jun 2012 19:55:44 +0530
From: "Poddar, Sourav" <sourav.poddar@...com>
To: devicetree-discuss@...ts.ozlabs.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, sourav.poddar@...com,
Andrew Morton <akpm@...ux-foundation.org>,
Benoit Cousson <b-cousson@...com>,
Rob Herring <rob.herring@...xeda.com>,
Grant Likely <grant.likely@...retlab.ca>,
Felipe Balbi <balbi@...com>, Dmitry Torokhov <dtor@...l.ru>,
Randy Dunlap <rdunlap@...otime.net>,
lo <linux-omap@...r.kernel.org>
Subject: Re: [RESEND/PATCHv5 1/2] drivers: input: keypad: Add device tree support
+cc linux-omap
On Fri, Jun 8, 2012 at 4:22 PM, Sourav Poddar <sourav.poddar@...com> wrote:
> Update the Documentation with omap4 keypad device tree
> binding information.
> Add device tree support for omap4 keypad driver.
>
> Tested on omap4430 sdp.
>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Benoit Cousson <b-cousson@...com>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Dmitry Torokhov <dtor@...l.ru>
> Cc: Randy Dunlap <rdunlap@...otime.net>
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>
> ---
> changes since v4:
> - Developed it on top of dmitry's 'next' branch due to
> dependency on generic "matrix_keypad_build_keymap" api
> patches queued in that branch
> - Adapted the driver to fill "keymap" in device tree
> using "matrix_keypad_build_keymap" api defined in
> drivers/input/matrix-keymap.c
> .../devicetree/bindings/input/omap-keypad.txt | 31 ++++++
> drivers/input/keyboard/omap4-keypad.c | 108 +++++++++++++++-----
> 2 files changed, 111 insertions(+), 28 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@...1c000{
> + 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 aed5f69..d5a2d1a 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>
> @@ -75,6 +76,7 @@ enum {
>
> struct omap4_keypad {
> struct input_dev *input;
> + struct matrix_keymap_data *keymap_data;
>
> void __iomem *base;
> unsigned int irq;
> @@ -84,6 +86,7 @@ struct omap4_keypad {
> u32 reg_offset;
> u32 irqreg_offset;
> unsigned int row_shift;
> + bool no_autorepeat;
> unsigned char key_state[8];
> unsigned short keymap[];
> };
> @@ -208,25 +211,74 @@ 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,
> + uint32_t rows, uint32_t cols,
> + struct input_dev *input_dev)
> +{
> + struct device_node *np = dev->of_node;
> + struct platform_device *pdev = to_platform_device(dev);
> + struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
> + int error;
> +
> + error = matrix_keypad_build_keymap(NULL, "linux,keymap",
> + rows, cols, keypad_data->keymap, input_dev);
> + if (error) {
> + dev_err(&pdev->dev, "failed to build keymap\n");
> + input_free_device(input_dev);
> + }
> +
> + 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 rev;
> 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);
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res) {
> dev_err(&pdev->dev, "no base address specified\n");
> @@ -239,22 +291,6 @@ 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);
> @@ -271,10 +307,10 @@ 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;
>
> /*
> * Enable clocks for the keypad module so that we can read
> @@ -322,15 +358,25 @@ 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,
> - keypad_data->keymap, input_dev);
> - if (error) {
> - dev_err(&pdev->dev, "failed to build keymap\n");
> - goto err_free_input;
> + if (np) {
> + keypad_data = omap_keypad_parse_dt(&pdev->dev,
> + keypad_data->rows, keypad_data->cols,
> + input_dev);
> + } else {
> + keypad_data->keymap_data =
> + (struct matrix_keymap_data *)pdata->keymap_data;
> + error = matrix_keypad_build_keymap(keypad_data->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;
> + }
> }
>
> - __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);
> @@ -351,7 +397,6 @@ 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:
> @@ -392,12 +437,19 @@ 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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