diff mbox series

[v2,8/9] gpio: mockup: use the generic 'gpio-line-names' property

Message ID 20200928104155.7385-9-brgl@bgdev.pl
State New
Headers show
Series gpio: mockup: refactoring + documentation | expand

Commit Message

Bartosz Golaszewski Sept. 28, 2020, 10:41 a.m. UTC
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

GPIO line names are currently created by the driver from the chip label.
We'll want to support custom formats for line names (for instance: to
name all lines the same) for user-space tests so create them in the
module init function and pass them to the driver using the standard
'gpio-line-names' property.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/gpio/gpio-mockup.c | 70 +++++++++++++++++++++-----------------
 1 file changed, 38 insertions(+), 32 deletions(-)

Comments

Andy Shevchenko Sept. 28, 2020, 1:01 p.m. UTC | #1
On Mon, Sep 28, 2020 at 12:41:54PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> 
> GPIO line names are currently created by the driver from the chip label.
> We'll want to support custom formats for line names (for instance: to
> name all lines the same) for user-space tests so create them in the
> module init function and pass them to the driver using the standard
> 'gpio-line-names' property.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
>  drivers/gpio/gpio-mockup.c | 70 +++++++++++++++++++++-----------------
>  1 file changed, 38 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
> index 5b2686f9e07d..47b7de6d5ab1 100644
> --- a/drivers/gpio/gpio-mockup.c
> +++ b/drivers/gpio/gpio-mockup.c
> @@ -19,6 +19,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
>  #include <linux/slab.h>
> +#include <linux/string_helpers.h>
>  #include <linux/uaccess.h>
>  
>  #include "gpiolib.h"
> @@ -374,29 +375,6 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
>  	}
>  }
>  
> -static int gpio_mockup_name_lines(struct device *dev,
> -				  struct gpio_mockup_chip *chip)
> -{
> -	struct gpio_chip *gc = &chip->gc;
> -	char **names;
> -	int i;
> -
> -	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
> -	if (!names)
> -		return -ENOMEM;
> -
> -	for (i = 0; i < gc->ngpio; i++) {
> -		names[i] = devm_kasprintf(dev, GFP_KERNEL,
> -					  "%s-%d", gc->label, i);
> -		if (!names[i])
> -			return -ENOMEM;
> -	}
> -
> -	gc->names = (const char *const *)names;
> -
> -	return 0;
> -}
> -
>  static void gpio_mockup_dispose_mappings(void *data)
>  {
>  	struct gpio_mockup_chip *chip = data;
> @@ -464,12 +442,6 @@ static int gpio_mockup_probe(struct platform_device *pdev)
>  	for (i = 0; i < gc->ngpio; i++)
>  		chip->lines[i].dir = GPIO_LINE_DIRECTION_IN;
>  
> -	if (device_property_read_bool(dev, "named-gpio-lines")) {
> -		rv = gpio_mockup_name_lines(dev, chip);
> -		if (rv)
> -			return rv;
> -	}
> -
>  	chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL,
>  							  gc->ngpio);
>  	if (IS_ERR(chip->irq_sim_domain))
> @@ -510,6 +482,27 @@ static void gpio_mockup_unregister_pdevs(void)
>  	}
>  }
>  
> +static __init char **gpio_mockup_make_line_names(const char *label,
> +						 unsigned int num_lines)
> +{
> +	unsigned int i;
> +	char **names;
> +
> +	names = kcalloc(num_lines + 1, sizeof(char *), GFP_KERNEL);
> +	if (!names)
> +		return NULL;
> +
> +	for (i = 0; i < num_lines; i++) {
> +		names[i] = kasprintf(GFP_KERNEL, "%s-%u", label, i);
> +		if (!names[i]) {
> +			kfree_strarray(names, i);
> +			return NULL;
> +		}
> +	}
> +
> +	return names;
> +}
> +
>  static int __init gpio_mockup_init(void)
>  {
>  	struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
> @@ -517,6 +510,7 @@ static int __init gpio_mockup_init(void)
>  	struct platform_device_info pdevinfo;
>  	struct platform_device *pdev;
>  	char chip_label[32];
> +	char **line_names;
>  	u16 ngpio;
>  
>  	if ((gpio_mockup_num_ranges < 2) ||
> @@ -549,6 +543,7 @@ static int __init gpio_mockup_init(void)
>  		memset(properties, 0, sizeof(properties));
>  		memset(&pdevinfo, 0, sizeof(pdevinfo));
>  		prop = 0;
> +		line_names = NULL;
>  
>  		snprintf(chip_label, sizeof(chip_label),
>  			 "gpio-mockup-%c", i + 'A');
> @@ -564,15 +559,26 @@ static int __init gpio_mockup_init(void)
>  				 : gpio_mockup_range_ngpio(i) - base;
>  		properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
>  
> -		if (gpio_mockup_named_lines)
> -			properties[prop++] = PROPERTY_ENTRY_BOOL(
> -						"named-gpio-lines");
> +		if (gpio_mockup_named_lines) {
> +			line_names = gpio_mockup_make_line_names(chip_label,
> +								 ngpio);
> +			if (!line_names) {
> +				platform_driver_unregister(&gpio_mockup_driver);
> +				gpio_mockup_unregister_pdevs();
> +				return -ENOMEM;
> +			}
> +
> +			properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
> +						"gpio-line-names",
> +						line_names, ngpio);
> +		}
>  
>  		pdevinfo.name = "gpio-mockup";
>  		pdevinfo.id = i;
>  		pdevinfo.properties = properties;
>  
>  		pdev = platform_device_register_full(&pdevinfo);
> +		kfree_strarray(line_names, ngpio);
>  		if (IS_ERR(pdev)) {
>  			pr_err("error registering device");
>  			platform_driver_unregister(&gpio_mockup_driver);
> -- 
> 2.26.1
>
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 5b2686f9e07d..47b7de6d5ab1 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -19,6 +19,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
+#include <linux/string_helpers.h>
 #include <linux/uaccess.h>
 
 #include "gpiolib.h"
@@ -374,29 +375,6 @@  static void gpio_mockup_debugfs_setup(struct device *dev,
 	}
 }
 
-static int gpio_mockup_name_lines(struct device *dev,
-				  struct gpio_mockup_chip *chip)
-{
-	struct gpio_chip *gc = &chip->gc;
-	char **names;
-	int i;
-
-	names = devm_kcalloc(dev, gc->ngpio, sizeof(char *), GFP_KERNEL);
-	if (!names)
-		return -ENOMEM;
-
-	for (i = 0; i < gc->ngpio; i++) {
-		names[i] = devm_kasprintf(dev, GFP_KERNEL,
-					  "%s-%d", gc->label, i);
-		if (!names[i])
-			return -ENOMEM;
-	}
-
-	gc->names = (const char *const *)names;
-
-	return 0;
-}
-
 static void gpio_mockup_dispose_mappings(void *data)
 {
 	struct gpio_mockup_chip *chip = data;
@@ -464,12 +442,6 @@  static int gpio_mockup_probe(struct platform_device *pdev)
 	for (i = 0; i < gc->ngpio; i++)
 		chip->lines[i].dir = GPIO_LINE_DIRECTION_IN;
 
-	if (device_property_read_bool(dev, "named-gpio-lines")) {
-		rv = gpio_mockup_name_lines(dev, chip);
-		if (rv)
-			return rv;
-	}
-
 	chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL,
 							  gc->ngpio);
 	if (IS_ERR(chip->irq_sim_domain))
@@ -510,6 +482,27 @@  static void gpio_mockup_unregister_pdevs(void)
 	}
 }
 
+static __init char **gpio_mockup_make_line_names(const char *label,
+						 unsigned int num_lines)
+{
+	unsigned int i;
+	char **names;
+
+	names = kcalloc(num_lines + 1, sizeof(char *), GFP_KERNEL);
+	if (!names)
+		return NULL;
+
+	for (i = 0; i < num_lines; i++) {
+		names[i] = kasprintf(GFP_KERNEL, "%s-%u", label, i);
+		if (!names[i]) {
+			kfree_strarray(names, i);
+			return NULL;
+		}
+	}
+
+	return names;
+}
+
 static int __init gpio_mockup_init(void)
 {
 	struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
@@ -517,6 +510,7 @@  static int __init gpio_mockup_init(void)
 	struct platform_device_info pdevinfo;
 	struct platform_device *pdev;
 	char chip_label[32];
+	char **line_names;
 	u16 ngpio;
 
 	if ((gpio_mockup_num_ranges < 2) ||
@@ -549,6 +543,7 @@  static int __init gpio_mockup_init(void)
 		memset(properties, 0, sizeof(properties));
 		memset(&pdevinfo, 0, sizeof(pdevinfo));
 		prop = 0;
+		line_names = NULL;
 
 		snprintf(chip_label, sizeof(chip_label),
 			 "gpio-mockup-%c", i + 'A');
@@ -564,15 +559,26 @@  static int __init gpio_mockup_init(void)
 				 : gpio_mockup_range_ngpio(i) - base;
 		properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
 
-		if (gpio_mockup_named_lines)
-			properties[prop++] = PROPERTY_ENTRY_BOOL(
-						"named-gpio-lines");
+		if (gpio_mockup_named_lines) {
+			line_names = gpio_mockup_make_line_names(chip_label,
+								 ngpio);
+			if (!line_names) {
+				platform_driver_unregister(&gpio_mockup_driver);
+				gpio_mockup_unregister_pdevs();
+				return -ENOMEM;
+			}
+
+			properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
+						"gpio-line-names",
+						line_names, ngpio);
+		}
 
 		pdevinfo.name = "gpio-mockup";
 		pdevinfo.id = i;
 		pdevinfo.properties = properties;
 
 		pdev = platform_device_register_full(&pdevinfo);
+		kfree_strarray(line_names, ngpio);
 		if (IS_ERR(pdev)) {
 			pr_err("error registering device");
 			platform_driver_unregister(&gpio_mockup_driver);