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SubjectRe: [PATCH 14/23] gpio: mockup: use the generic 'gpio-line-names' property
On Fri, Sep 04, 2020 at 05:45:38PM +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.
>
> 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 ce83f1df1933..96976ba66598 100644
> --- a/drivers/gpio/gpio-mockup.c
> +++ b/drivers/gpio/gpio-mockup.c
> @@ -18,6 +18,7 @@
> #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"
> @@ -378,29 +379,6 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
> return;
> }
>
> -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;
> @@ -468,12 +446,6 @@ 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))
> @@ -524,6 +496,27 @@ static void gpio_mockup_unregister_devices(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];
> @@ -531,6 +524,7 @@ static int __init gpio_mockup_init(void)
> struct gpio_mockup_device *mockup_dev;
> int i, prop, num_chips, err = 0, base;
> struct platform_device_info pdevinfo;
> + char **line_names;
> u16 ngpio;
>
> if ((gpio_mockup_num_ranges < 2) ||
> @@ -563,6 +557,7 @@ 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');
> @@ -578,9 +573,18 @@ 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) {
> + err = -ENOMEM;
> + goto err_out;
> + }
> +
> + properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
> + "gpio-line-names",
> + line_names, ngpio);
> + }

Indentation here looks quite deep. Maybe introduce a helper in between where
you assign properties?

> pdevinfo.name = "gpio-mockup";
> pdevinfo.id = i;
> @@ -588,11 +592,13 @@ static int __init gpio_mockup_init(void)
>
> mockup_dev = kzalloc(sizeof(*mockup_dev), GFP_KERNEL);
> if (!mockup_dev) {
> + kfree_strarray(line_names, ngpio);
> err = -ENOMEM;
> goto err_out;
> }
>
> mockup_dev->pdev = platform_device_register_full(&pdevinfo);
> + kfree_strarray(line_names, ngpio);
> if (IS_ERR(mockup_dev->pdev)) {
> pr_err("error registering device");
> kfree(mockup_dev);
> --
> 2.26.1
>

--
With Best Regards,
Andy Shevchenko


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