From mboxrd@z Thu Jan 1 00:00:00 1970 From: dbaryshkov@gmail.com (Dmitry Eremin-Solenikov) Date: Wed, 22 Jun 2011 16:20:16 +0400 Subject: [PATCH 1/2] gpio-vbus: support disabling D+ pullup on suspend Message-ID: <1308745217-10883-1-git-send-email-dbaryshkov@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Some platforms would like to disable D+ pullup on suspend, to drain as low power, as possible. E.g. this was requested by mioa701 board maintainers. Signed-off-by: Dmitry Eremin-Solenikov --- drivers/usb/otg/gpio_vbus.c | 32 ++++++++++++++++++++++++++++++++ include/linux/usb/gpio_vbus.h | 1 + 2 files changed, 33 insertions(+), 0 deletions(-) diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c index 52733d9..44527bd 100644 --- a/drivers/usb/otg/gpio_vbus.c +++ b/drivers/usb/otg/gpio_vbus.c @@ -327,6 +327,34 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static int gpio_vbus_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); + struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data; + + if (gpio_vbus->otg.gadget && pdata->disconnect_on_suspend) { + /* optionally disable D+ pullup */ + if (gpio_is_valid(pdata->gpio_pullup)) + gpio_set_value(pdata->gpio_pullup, + pdata->gpio_pullup_inverted); + + set_vbus_draw(gpio_vbus, 0); + } + return 0; +} + +static int gpio_vbus_resume(struct platform_device *pdev) +{ + struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev); + + if (gpio_vbus->otg.gadget) + schedule_work(&gpio_vbus->work); + + return 0; +} +#endif + /* NOTE: the gpio-vbus device may *NOT* be hotplugged */ MODULE_ALIAS("platform:gpio-vbus"); @@ -337,6 +365,10 @@ static struct platform_driver gpio_vbus_driver = { .owner = THIS_MODULE, }, .remove = __exit_p(gpio_vbus_remove), +#ifdef CONFIG_PM + .suspend = gpio_vbus_suspend, + .resume = gpio_vbus_resume +#endif }; static int __init gpio_vbus_init(void) diff --git a/include/linux/usb/gpio_vbus.h b/include/linux/usb/gpio_vbus.h index d9f03cc..2faa38d 100644 --- a/include/linux/usb/gpio_vbus.h +++ b/include/linux/usb/gpio_vbus.h @@ -27,4 +27,5 @@ struct gpio_vbus_mach_info { int gpio_pullup; bool gpio_vbus_inverted; bool gpio_pullup_inverted; + bool disconnect_on_suspend; }; -- 1.7.5.3