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Date: Wed, 11 Dec 2013 13:00:18 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>,
linux-netdev@...r.kernel.org,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>
Cc: ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Chris Ball <cjb@...top.org>,
Johannes Berg <johannes@...solutions.net>,
Rhyland Klein <rklein@...dia.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Alexandre Courbot <acourbot@...dia.com>,
Mathias Nyman <mathias.nyman@...ux.intel.com>,
Rob Landley <rob@...dley.net>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/6] net: rfkill: gpio: convert to descriptor-based
GPIO interface
On Tue, Nov 26, 2013 at 11:05 AM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
> From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>
> Convert to the safer gpiod_* family of API functions.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Tested-by: Stephen Warren <swarren@...dia.com>
> ---
> net/rfkill/rfkill-gpio.c | 77 +++++++++++++++++++++---------------------------
> 1 file changed, 34 insertions(+), 43 deletions(-)
>
> diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
> index 5620d3c07479..bd2a5b90400c 100644
> --- a/net/rfkill/rfkill-gpio.c
> +++ b/net/rfkill/rfkill-gpio.c
> @@ -25,15 +25,15 @@
> #include <linux/clk.h>
> #include <linux/slab.h>
> #include <linux/acpi.h>
> -#include <linux/acpi_gpio.h>
> +#include <linux/gpio/consumer.h>
>
> #include <linux/rfkill-gpio.h>
>
> struct rfkill_gpio_data {
> const char *name;
> enum rfkill_type type;
> - int reset_gpio;
> - int shutdown_gpio;
> + struct gpio_desc *reset_gpio;
> + struct gpio_desc *shutdown_gpio;
>
> struct rfkill *rfkill_dev;
> char *reset_name;
> @@ -48,19 +48,15 @@ static int rfkill_gpio_set_power(void *data, bool blocked)
> struct rfkill_gpio_data *rfkill = data;
>
> if (blocked) {
> - if (gpio_is_valid(rfkill->shutdown_gpio))
> - gpio_set_value(rfkill->shutdown_gpio, 0);
> - if (gpio_is_valid(rfkill->reset_gpio))
> - gpio_set_value(rfkill->reset_gpio, 0);
> + gpiod_set_value(rfkill->shutdown_gpio, 0);
> + gpiod_set_value(rfkill->reset_gpio, 0);
> if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
> clk_disable(rfkill->clk);
> } else {
> if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
> clk_enable(rfkill->clk);
> - if (gpio_is_valid(rfkill->reset_gpio))
> - gpio_set_value(rfkill->reset_gpio, 1);
> - if (gpio_is_valid(rfkill->shutdown_gpio))
> - gpio_set_value(rfkill->shutdown_gpio, 1);
> + gpiod_set_value(rfkill->reset_gpio, 1);
> + gpiod_set_value(rfkill->shutdown_gpio, 1);
> }
>
> rfkill->clk_enabled = blocked;
> @@ -83,8 +79,6 @@ static int rfkill_gpio_acpi_probe(struct device *dev,
>
> rfkill->name = dev_name(dev);
> rfkill->type = (unsigned)id->driver_data;
> - rfkill->reset_gpio = acpi_get_gpio_by_index(dev, 0, NULL);
> - rfkill->shutdown_gpio = acpi_get_gpio_by_index(dev, 1, NULL);
>
> return 0;
> }
> @@ -94,8 +88,9 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
> struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
> struct rfkill_gpio_data *rfkill;
> const char *clk_name = NULL;
> - int ret = 0;
> - int len = 0;
> + struct gpio_desc *gpio;
> + int ret;
> + int len;
>
> rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
> if (!rfkill)
> @@ -109,28 +104,10 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
> clk_name = pdata->power_clk_name;
> rfkill->name = pdata->name;
> rfkill->type = pdata->type;
> - rfkill->reset_gpio = pdata->reset_gpio;
> - rfkill->shutdown_gpio = pdata->shutdown_gpio;
> } else {
> return -ENODEV;
> }
>
> - /* make sure at-least one of the GPIO is defined and that
> - * a name is specified for this instance */
> - if ((!gpio_is_valid(rfkill->reset_gpio) &&
> - !gpio_is_valid(rfkill->shutdown_gpio)) || !rfkill->name) {
> - pr_warn("%s: invalid platform data\n", __func__);
> - return -EINVAL;
> - }
> -
> - if (pdata && pdata->gpio_runtime_setup) {
> - ret = pdata->gpio_runtime_setup(pdev);
> - if (ret) {
> - pr_warn("%s: can't set up gpio\n", __func__);
> - return ret;
> - }
> - }
> -
> len = strlen(rfkill->name);
> rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL);
> if (!rfkill->reset_name)
> @@ -145,20 +122,34 @@ static int rfkill_gpio_probe(struct platform_device *pdev)
>
> rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
>
> - if (gpio_is_valid(rfkill->reset_gpio)) {
> - ret = devm_gpio_request_one(&pdev->dev, rfkill->reset_gpio,
> - 0, rfkill->reset_name);
> - if (ret) {
> - pr_warn("%s: failed to get reset gpio.\n", __func__);
> + gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0);
> + if (!IS_ERR(gpio)) {
> + ret = gpiod_direction_output(gpio, 0);
> + if (ret)
> return ret;
> - }
> + rfkill->reset_gpio = gpio;
> + }
> +
> + gpio = devm_gpiod_get_index(&pdev->dev, rfkill->shutdown_name, 1);
> + if (!IS_ERR(gpio)) {
> + ret = gpiod_direction_output(gpio, 0);
> + if (ret)
> + return ret;
> + rfkill->shutdown_gpio = gpio;
> }
>
> - if (gpio_is_valid(rfkill->shutdown_gpio)) {
> - ret = devm_gpio_request_one(&pdev->dev, rfkill->shutdown_gpio,
> - 0, rfkill->shutdown_name);
> + /* Make sure at-least one of the GPIO is defined and that
> + * a name is specified for this instance
> + */
> + if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) {
> + dev_err(&pdev->dev, "invalid platform data\n");
> + return -EINVAL;
> + }
> +
> + if (pdata && pdata->gpio_runtime_setup) {
> + ret = pdata->gpio_runtime_setup(pdev);
> if (ret) {
> - pr_warn("%s: failed to get shutdown gpio.\n", __func__);
> + dev_err(&pdev->dev, "can't set up gpio\n");
> return ret;
> }
> }
DavidM: can I have an ACK from you to apply this patch through the GPIO
tree?
Yours,
Linus Walleij
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