Tarun Kanti DebBarma <tarun.ka...@ti.com> writes:
> Add *remove* callback so that necessary cleanup operations are
> performed when device is unregistered. The device is deleted
> from the list and associated clock handle is released by
> calling clk_put() and irq descriptor is released using the
> irq_free_desc() api.
>
> Signed-off-by: Tarun Kanti DebBarma <tarun.ka...@ti.com>
> Reported-by: Paul Walmsley <p...@pwsan.com>
> Reviewed-by: Jon Hunter <jon-hun...@ti.com>
> Cc: Kevin Hilman <khil...@ti.com>
> Cc: Rajendra Nayak <rna...@ti.com>
> Cc: Santosh Shilimkar <santosh.shilim...@ti.com>
> Cc: Cousson, Benoit <b-cous...@ti.com>
> Cc: Paul Walmsley <p...@pwsan.com>
> ---
> v2:
> Baseline: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> Commit: 0d7614f09c1ebdbaa1599a5aba7593f147bf96ee (Linux 3.6-rc1)
>
> (1) Use irq_free_descs() instead of irq_free_desc().
> Besides, irq_free_desc() was using wrong parameter,
> irq_base, instead of bank->irq.
> (2) irq_free_descs() moved outside spin_lock/unlock_*()
> in order to avoid exception warnings.
>
> (3) pm_runtime_disable() added so that bind can happen successfully
>
> Test Detail:
> Step 1: Unbind gpio.5 device in order to invoke the *remove* callback.
> #echo "omap_gpio.5" > sys/bus/platform/drivers/omap_gpio/unbind
>
> Step 2: Bind gpio.5 device and confirm probe() for the device succeeds.
> #echo "omap_gpio.5" > sys/bus/platform/drivers/omap_gpio/bind
>
> Step 3: Execute read/write GPIO test case.
What happens when GPIOs are in use (requested)?
Kevin
> drivers/gpio/gpio-omap.c | 35 +++++++++++++++++++++++++++++++++++
> 1 files changed, 35 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index e6efd77..50de875 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -1152,6 +1152,40 @@ static int __devinit omap_gpio_probe(struct
> platform_device *pdev)
> return ret;
> }
>
> +/**
> + * omap_gpio_remove - cleanup a registered gpio device
> + * @pdev: pointer to current gpio platform device
> + *
> + * Called by driver framework whenever a gpio device is unregistered.
> + * GPIO is deleted from the list and associated clock handle freed.
> + */
> +static int __devexit omap_gpio_remove(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct gpio_bank *bank;
> + unsigned long flags;
> + int ret = -EINVAL;
> +
> + list_for_each_entry(bank, &omap_gpio_list, node) {
> + spin_lock_irqsave(&bank->lock, flags);
> + if (bank->dev == dev) {
> + clk_put(bank->dbck);
> + list_del(&bank->node);
> + ret = 0;
> + spin_unlock_irqrestore(&bank->lock, flags);
> + break;
> + }
> + spin_unlock_irqrestore(&bank->lock, flags);
> + }
> +
> + if (!ret) {
> + pm_runtime_disable(bank->dev);
> + irq_free_descs(bank->irq_base, bank->width);
> + }
> +
> + return ret;
> +}
> +
> #ifdef CONFIG_ARCH_OMAP2PLUS
>
> #if defined(CONFIG_PM_RUNTIME)
> @@ -1478,6 +1512,7 @@ MODULE_DEVICE_TABLE(of, omap_gpio_match);
>
> static struct platform_driver omap_gpio_driver = {
> .probe = omap_gpio_probe,
> + .remove = __devexit_p(omap_gpio_remove),
> .driver = {
> .name = "omap_gpio",
> .pm = &gpio_pm_ops,
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