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Message-ID: <CAKdam54gZoMEaH93FDL9D--GB=TqcSTEGz69TcZ99NdnvnQzsg@mail.gmail.com>
Date: Wed, 11 Jul 2012 15:15:47 +0530
From: "Poddar, Sourav" <sourav.poddar@...com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: devicetree-discuss@...ts.ozlabs.org,
linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org,
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>,
Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [RESEND/PATCHv5 1/2] drivers: input: keypad: Add device tree support
Hi Dmitry,
On Tue, Jul 10, 2012 at 11:43 AM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> Hi Sourav,
>
> On Fri, Jun 08, 2012 at 04:22:59PM +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.
>>
>
> Sorry for the delay, I have a few comments:
>
>>
>> /* 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;
>> }
>>
>
> I believe drivers should use platform data if it is supplied and use DT
> data if platform data is omitted. This way one can override firmware
> data if needed.
>
> Does the patch below (if applied on top of your) work for you?
>
Yes, the above patch works fine for me.
Acked-by: Sourav Poddar <sourav.poddar@...com>
Note, I did some mux setting changes in the bootloader for DT case.
Thanks,
Sourav
> Thanks.
>
> --
> Dmitry
>
> Input: omap4-keypad - misc fixes
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>
> drivers/input/keyboard/omap4-keypad.c | 152 ++++++++++++++++-----------------
> 1 file changed, 74 insertions(+), 78 deletions(-)
>
>
> diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
> index d5a2d1a..033168e 100644
> --- a/drivers/input/keyboard/omap4-keypad.c
> +++ b/drivers/input/keyboard/omap4-keypad.c
> @@ -76,7 +76,6 @@ enum {
>
> struct omap4_keypad {
> struct input_dev *input;
> - struct matrix_keymap_data *keymap_data;
>
> void __iomem *base;
> unsigned int irq;
> @@ -88,7 +87,7 @@ struct omap4_keypad {
> 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)
> @@ -211,74 +210,52 @@ 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)
> +#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;
> - 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 (!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 keypad_data;
> + 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)
> {
> - struct device *dev = &pdev->dev;
> - struct device_node *np = dev->of_node;
> - 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 = 0, max_keys = 0;
> - uint32_t num_rows = 0, num_cols = 0;
> + unsigned int max_keys;
> int rev;
> int irq;
> int error;
>
> - /* platform data */
> - pdata = pdev->dev.platform_data;
> - 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");
> @@ -291,9 +268,24 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - size = resource_size(res);
> + keypad_data = kzalloc(sizeof(struct omap4_keypad), GFP_KERNEL);
> + if (!keypad_data) {
> + dev_err(&pdev->dev, "keypad_data memory allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + 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;
> @@ -307,15 +299,11 @@ 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;
>
> /*
> - * 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) {
> @@ -358,29 +346,30 @@ static int __devinit omap4_keypad_probe(struct platform_device *pdev)
> input_dev->open = omap4_keypad_open;
> input_dev->close = omap4_keypad_close;
>
> - 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;
> - }
> - }
> -
> + input_set_capability(input_dev, EV_MSC, MSC_SCAN);
> 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);
>
> + 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_keymap;
> + }
> +
> error = request_irq(keypad_data->irq, omap4_keypad_interrupt,
> IRQF_TRIGGER_RISING,
> "omap4-keypad", keypad_data);
> @@ -397,11 +386,14 @@ 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:
> 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:
> @@ -409,7 +401,7 @@ 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;
> @@ -431,17 +423,21 @@ 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,
--
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