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ARM: 6209/3: at91_udc: Add vbus polarity and polling mode

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Allow the vbus signal to optionally use polling. This is required if
the vbus signal is connected to an non-interrupting io expander for
example. If vbus is in polling mode, then it is assumed that the vbus
gpio may sleep. Also add an option to have vbus be an active low
signal. Both options are set in the platform data for the device.

Signed-off-by: Ryan Mallon <ryan@bluewatersys.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ryan Mallon 2010-07-13 05:09:16 +01:00 committed by Russell King
parent 064baaca87
commit 4037242c4f
3 changed files with 57 additions and 13 deletions
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2
arch/arm/mach-at91/include/mach/board.h
View file

@ -44,6 +44,8 @@
/* USB Device */
struct at91_udc_data {
u8 vbus_pin; /* high == host powering us */
u8 vbus_active_low; /* vbus polarity */
u8 vbus_polled; /* Use polling, not interrupt */
u8 pullup_pin; /* active == D+ pulled up */
u8 pullup_active_low; /* true == pullup_pin is active low */
};

66
drivers/usb/gadget/at91_udc.c
View file

@ -76,6 +76,7 @@
static const char driver_name [] = "at91_udc";
static const char ep0name[] = "ep0";
#define VBUS_POLL_TIMEOUT msecs_to_jiffies(1000)
#define at91_udp_read(udc, reg) \
__raw_readl((udc)->udp_baseaddr + (reg))
@ -1585,20 +1586,48 @@ static struct at91_udc controller = {
/* ep6 and ep7 are also reserved (custom silicon might use them) */
};
static void at91_vbus_update(struct at91_udc *udc, unsigned value)
{
value ^= udc->board.vbus_active_low;
if (value != udc->vbus)
at91_vbus_session(&udc->gadget, value);
}
static irqreturn_t at91_vbus_irq(int irq, void *_udc)
{
struct at91_udc *udc = _udc;
unsigned value;
/* vbus needs at least brief debouncing */
udelay(10);
value = gpio_get_value(udc->board.vbus_pin);
if (value != udc->vbus)
at91_vbus_session(&udc->gadget, value);
at91_vbus_update(udc, gpio_get_value(udc->board.vbus_pin));
return IRQ_HANDLED;
}
static void at91_vbus_timer_work(struct work_struct *work)
{
struct at91_udc *udc = container_of(work, struct at91_udc,
vbus_timer_work);
at91_vbus_update(udc, gpio_get_value_cansleep(udc->board.vbus_pin));
if (!timer_pending(&udc->vbus_timer))
mod_timer(&udc->vbus_timer, jiffies + VBUS_POLL_TIMEOUT);
}
static void at91_vbus_timer(unsigned long data)
{
struct at91_udc *udc = (struct at91_udc *)data;
/*
* If we are polling vbus it is likely that the gpio is on an
* bus such as i2c or spi which may sleep, so schedule some work
* to read the vbus gpio
*/
if (!work_pending(&udc->vbus_timer_work))
schedule_work(&udc->vbus_timer_work);
}
int usb_gadget_register_driver (struct usb_gadget_driver *driver)
{
struct at91_udc *udc = &controller;
@ -1800,13 +1829,23 @@ static int __init at91udc_probe(struct platform_device *pdev)
* Get the initial state of VBUS - we cannot expect
* a pending interrupt.
*/
udc->vbus = gpio_get_value(udc->board.vbus_pin);
if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
IRQF_DISABLED, driver_name, udc)) {
DBG("request vbus irq %d failed\n",
udc->board.vbus_pin);
retval = -EBUSY;
goto fail3;
udc->vbus = gpio_get_value_cansleep(udc->board.vbus_pin) ^
udc->board.vbus_active_low;
if (udc->board.vbus_polled) {
INIT_WORK(&udc->vbus_timer_work, at91_vbus_timer_work);
setup_timer(&udc->vbus_timer, at91_vbus_timer,
(unsigned long)udc);
mod_timer(&udc->vbus_timer,
jiffies + VBUS_POLL_TIMEOUT);
} else {
if (request_irq(udc->board.vbus_pin, at91_vbus_irq,
IRQF_DISABLED, driver_name, udc)) {
DBG("request vbus irq %d failed\n",
udc->board.vbus_pin);
retval = -EBUSY;
goto fail3;
}
}
} else {
DBG("no VBUS detection, assuming always-on\n");
@ -1898,7 +1937,7 @@ static int at91udc_suspend(struct platform_device *pdev, pm_message_t mesg)
enable_irq_wake(udc->udp_irq);
udc->active_suspend = wake;
if (udc->board.vbus_pin > 0 && wake)
if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled && wake)
enable_irq_wake(udc->board.vbus_pin);
return 0;
}
@ -1908,7 +1947,8 @@ static int at91udc_resume(struct platform_device *pdev)
struct at91_udc *udc = platform_get_drvdata(pdev);
unsigned long flags;
if (udc->board.vbus_pin > 0 && udc->active_suspend)
if (udc->board.vbus_pin > 0 && !udc->board.vbus_polled &&
udc->active_suspend)
disable_irq_wake(udc->board.vbus_pin);
/* maybe reconnect to host; if so, clocks on */

2
drivers/usb/gadget/at91_udc.h
View file

@ -145,6 +145,8 @@ struct at91_udc {
void __iomem *udp_baseaddr;
int udp_irq;
spinlock_t lock;
struct timer_list vbus_timer;
struct work_struct vbus_timer_work;
};
static inline struct at91_udc *to_udc(struct usb_gadget *g)