linux-kernel - Re: [PATCH v4 1/4] Input: adp5589: Add default platform data

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Message-ID: <44fc70102430d4d13221907a3d5ccd2d8021b854.camel@analog.com>
Date:   Wed, 1 Apr 2020 14:05:17 +0000
From:   "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
To:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "lars@...afoo.de" <lars@...afoo.de>
Subject: Re: [PATCH v4 1/4] Input: adp5589: Add default platform data

On Thu, 2020-03-05 at 15:14 +0200, Alexandru Ardelean wrote:
> From: Lars-Peter Clausen <lars@...afoo.de>
> 
> If no platform data is supplied use a dummy platform data that configures
> the device in GPIO only mode. This change adds a adp5589_kpad_pdata_get()
> helper that returns the default platform-data. This can be later extended
> to load configuration from device-trees or ACPI.

ping

> 
> Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> ---
> 
> Changelog v3 -> v4:
> * Fixed smatch warnings about potential leak being created; resulted in 2
>   more patches:
>   - Input: adp5589: unify ret & error variables
>   - Input: adp5589: fix possible memleak of 'kpad'
> 
> Changelog v2 -> v3:
> * fix `-Wpointer-to-int-cast` warnings for patch `input: adp5589: Add basic
>   devicetree support` ; warnings shows up on 64 bit ARCHs
> 
> Changelog v1 -> v2:
> * adjusted patch `input: adp5589: Add default platform data` by
>   introducting a `adp5589_kpad_pdata_get()` helper, which returns the
>   platform-data; the previos patch was based on an older version of the
>   kernel from the ADI kernel-tree; the driver was sync-ed with the upstream
>   version
> 
>  drivers/input/keyboard/adp5589-keys.c | 36 +++++++++++++++++++--------
>  1 file changed, 26 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/input/keyboard/adp5589-keys.c
> b/drivers/input/keyboard/adp5589-keys.c
> index e7d58e7f0257..c6a801bcdf90 100644
> --- a/drivers/input/keyboard/adp5589-keys.c
> +++ b/drivers/input/keyboard/adp5589-keys.c
> @@ -369,6 +369,25 @@ static const struct adp_constants const_adp5585 = {
>  	.reg			= adp5585_reg,
>  };
>  
> +static const struct adp5589_gpio_platform_data adp5589_default_gpio_pdata = {
> +	.gpio_start = -1,
> +};
> +
> +static const struct adp5589_kpad_platform_data adp5589_default_pdata = {
> +	.gpio_data = &adp5589_default_gpio_pdata,
> +};
> +
> +static const struct adp5589_kpad_platform_data *adp5589_kpad_pdata_get(
> +	struct device *dev)
> +{
> +	const struct adp5589_kpad_platform_data *pdata = dev_get_platdata(dev);
> +
> +	if (!pdata)
> +		pdata = &adp5589_default_pdata;
> +
> +	return pdata;
> +}
> +
>  static int adp5589_read(struct i2c_client *client, u8 reg)
>  {
>  	int ret = i2c_smbus_read_byte_data(client, reg);
> @@ -498,7 +517,8 @@ static int adp5589_build_gpiomap(struct adp5589_kpad
> *kpad,
>  static int adp5589_gpio_add(struct adp5589_kpad *kpad)
>  {
>  	struct device *dev = &kpad->client->dev;
> -	const struct adp5589_kpad_platform_data *pdata = dev_get_platdata(dev);
> +	const struct adp5589_kpad_platform_data *pdata =
> +		adp5589_kpad_pdata_get(dev);
>  	const struct adp5589_gpio_platform_data *gpio_data = pdata->gpio_data;
>  	int i, error;
>  
> @@ -553,7 +573,8 @@ static int adp5589_gpio_add(struct adp5589_kpad *kpad)
>  static void adp5589_gpio_remove(struct adp5589_kpad *kpad)
>  {
>  	struct device *dev = &kpad->client->dev;
> -	const struct adp5589_kpad_platform_data *pdata = dev_get_platdata(dev);
> +	const struct adp5589_kpad_platform_data *pdata =
> +		adp5589_kpad_pdata_get(dev);
>  	const struct adp5589_gpio_platform_data *gpio_data = pdata->gpio_data;
>  	int error;
>  
> @@ -656,7 +677,7 @@ static int adp5589_setup(struct adp5589_kpad *kpad)
>  {
>  	struct i2c_client *client = kpad->client;
>  	const struct adp5589_kpad_platform_data *pdata =
> -		dev_get_platdata(&client->dev);
> +		adp5589_kpad_pdata_get(&client->dev);
>  	u8 (*reg) (u8) = kpad->var->reg;
>  	unsigned char evt_mode1 = 0, evt_mode2 = 0, evt_mode3 = 0;
>  	unsigned char pull_mask = 0;
> @@ -861,7 +882,7 @@ static int adp5589_keypad_add(struct adp5589_kpad *kpad,
> unsigned int revid)
>  {
>  	struct i2c_client *client = kpad->client;
>  	const struct adp5589_kpad_platform_data *pdata =
> -		dev_get_platdata(&client->dev);
> +		adp5589_kpad_pdata_get(&client->dev);
>  	struct input_dev *input;
>  	unsigned int i;
>  	int error;
> @@ -992,7 +1013,7 @@ static int adp5589_probe(struct i2c_client *client,
>  {
>  	struct adp5589_kpad *kpad;
>  	const struct adp5589_kpad_platform_data *pdata =
> -		dev_get_platdata(&client->dev);
> +		adp5589_kpad_pdata_get(&client->dev);
>  	unsigned int revid;
>  	int error, ret;
>  
> @@ -1002,11 +1023,6 @@ static int adp5589_probe(struct i2c_client *client,
>  		return -EIO;
>  	}
>  
> -	if (!pdata) {
> -		dev_err(&client->dev, "no platform data?\n");
> -		return -EINVAL;
> -	}
> -
>  	kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
>  	if (!kpad)
>  		return -ENOMEM;