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Date: Fri, 4 Sep 2020 19:50:29 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Jonathan Corbet <corbet@....net>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 16/23] gpio: mockup: refactor the module init function
On Fri, Sep 04, 2020 at 05:45:40PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> This is in preparation for dynamically created chips.
>
> Let's split out the code that can be reused when creating chips at
> run-time. Let's also move the code preparing the device properties into
> a separate routine. This has the advantage of simplifying the error
> handling.
Almost all contents of this patch should go to proposed helper as I mentioned
before. Will make this patch quite small and understandable.
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
> drivers/gpio/gpio-mockup.c | 165 ++++++++++++++++++++-----------------
> 1 file changed, 90 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
> index 995e37fef9c5..eb94ddac5fee 100644
> --- a/drivers/gpio/gpio-mockup.c
> +++ b/drivers/gpio/gpio-mockup.c
> @@ -524,16 +524,78 @@ static __init char **gpio_mockup_make_line_names(const char *label,
> return names;
> }
>
> -static int __init gpio_mockup_init(void)
> +static int __init gpio_mockup_register_device(struct property_entry *properties)
> {
> - struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
> - char chip_label[GPIO_MOCKUP_LABEL_SIZE];
> struct gpio_mockup_device *mockup_dev;
> - int i, prop, num_chips, err = 0, base;
> struct platform_device_info pdevinfo;
> - char **line_names;
> +
> + memset(&pdevinfo, 0, sizeof(pdevinfo));
> +
> + mockup_dev = kzalloc(sizeof(*mockup_dev), GFP_KERNEL);
> + if (!mockup_dev)
> + return -ENOMEM;
> +
> + pdevinfo.name = "gpio-mockup";
> + pdevinfo.properties = properties;
> +
> + pdevinfo.id = ida_alloc(&gpio_mockup_ida, GFP_KERNEL);
> + if (pdevinfo.id < 0) {
> + kfree(mockup_dev);
> + return pdevinfo.id;
> + }
> +
> + mockup_dev->pdev = platform_device_register_full(&pdevinfo);
> + if (IS_ERR(mockup_dev->pdev)) {
> + ida_free(&gpio_mockup_ida, pdevinfo.id);
> + kfree(mockup_dev);
> + return PTR_ERR(mockup_dev->pdev);
> + }
> +
> + list_add(&mockup_dev->list, &gpio_mockup_devices);
> +
> + return 0;
> +}
> +
> +static int __init gpio_mockup_register_one_chip_from_params(int idx)
> +{
> + char chip_label[GPIO_MOCKUP_LABEL_SIZE], **line_names = NULL;
> + struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
> + int prop = 0, base, ret;
> u16 ngpio;
>
> + memset(properties, 0, sizeof(properties));
> +
> + snprintf(chip_label, sizeof(chip_label), "gpio-mockup-%c", idx + 'A');
> + properties[prop++] = PROPERTY_ENTRY_STRING("chip-label",
> + chip_label);
> +
> + base = gpio_mockup_range_base(idx);
> + if (base >= 0)
> + properties[prop++] = PROPERTY_ENTRY_U32("gpio-base",
> + base);
> +
> + ngpio = base < 0 ? gpio_mockup_range_ngpio(idx)
> + : gpio_mockup_range_ngpio(idx) - base;
> + properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
> +
> + if (gpio_mockup_named_lines) {
> + line_names = gpio_mockup_make_line_names(chip_label, ngpio);
> + if (!line_names)
> + return -ENOMEM;
> +
> + properties[prop++] = PROPERTY_ENTRY_STRING_ARRAY_LEN(
> + "gpio-line-names", line_names, ngpio);
> + }
> +
> + ret = gpio_mockup_register_device(properties);
> + kfree_strarray(line_names, ngpio);
> + return ret;
> +}
> +
> +static int __init gpio_mockup_register_chips_from_params(void)
> +{
> + int num_chips, i, ret;
> +
> if ((gpio_mockup_num_ranges < 2) ||
> (gpio_mockup_num_ranges % 2) ||
> (gpio_mockup_num_ranges > GPIO_MOCKUP_MAX_RANGES))
> @@ -551,86 +613,39 @@ static int __init gpio_mockup_init(void)
> return -EINVAL;
> }
>
> - gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup", NULL);
> -
> - err = platform_driver_register(&gpio_mockup_driver);
> - if (err) {
> - pr_err("error registering platform driver\n");
> - debugfs_remove_recursive(gpio_mockup_dbg_dir);
> - return err;
> - }
> -
> for (i = 0; i < num_chips; i++) {
> - 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');
> - properties[prop++] = PROPERTY_ENTRY_STRING("chip-label",
> - chip_label);
> -
> - base = gpio_mockup_range_base(i);
> - if (base >= 0)
> - properties[prop++] = PROPERTY_ENTRY_U32("gpio-base",
> - base);
> -
> - ngpio = base < 0 ? gpio_mockup_range_ngpio(i)
> - : gpio_mockup_range_ngpio(i) - base;
> - properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);
> -
> - 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);
> + ret = gpio_mockup_register_one_chip_from_params(i);
> + if (ret) {
> + gpio_mockup_unregister_devices();
> + return ret;
> }
> + }
>
> - pdevinfo.name = "gpio-mockup";
> - pdevinfo.properties = properties;
> + return 0;
> +}
>
> - pdevinfo.id = ida_alloc(&gpio_mockup_ida, GFP_KERNEL);
> - if (pdevinfo.id < 0) {
> - kfree_strarray(line_names, ngpio);
> - err = pdevinfo.id;
> - goto err_out;
> - }
> +static int __init gpio_mockup_init(void)
> +{
> + int ret;
>
> - mockup_dev = kzalloc(sizeof(*mockup_dev), GFP_KERNEL);
> - if (!mockup_dev) {
> - kfree_strarray(line_names, ngpio);
> - ida_free(&gpio_mockup_ida, pdevinfo.id);
> - err = -ENOMEM;
> - goto err_out;
> - }
> + gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup", NULL);
>
> - mockup_dev->pdev = platform_device_register_full(&pdevinfo);
> - kfree_strarray(line_names, ngpio);
> - if (IS_ERR(mockup_dev->pdev)) {
> - pr_err("error registering device");
> - ida_free(&gpio_mockup_ida, pdevinfo.id);
> - kfree(mockup_dev);
> - err = PTR_ERR(mockup_dev->pdev);
> - goto err_out;
> - }
> + ret = platform_driver_register(&gpio_mockup_driver);
> + if (ret) {
> + pr_err("error registering platform driver\n");
> + debugfs_remove_recursive(gpio_mockup_dbg_dir);
> + return ret;
> + }
>
> - list_add(&mockup_dev->list, &gpio_mockup_devices);
> + ret = gpio_mockup_register_chips_from_params();
> + if (ret) {
> + pr_err("error registering device");
> + debugfs_remove_recursive(gpio_mockup_dbg_dir);
> + platform_driver_unregister(&gpio_mockup_driver);
> + return ret;
> }
>
> return 0;
> -
> -err_out:
> - platform_driver_unregister(&gpio_mockup_driver);
> - gpio_mockup_unregister_devices();
> - debugfs_remove_recursive(gpio_mockup_dbg_dir);
> - return err;
> }
>
> static void __exit gpio_mockup_exit(void)
> --
> 2.26.1
>
--
With Best Regards,
Andy Shevchenko
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