dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

mfd: Emulate active low IRQs as well as active high IRQs for wm831x 

As with the existing emulation this should not be used in production
systems but is useful for test purposes.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2012-05-18 17:02:02 +01:00 committed by Samuel Ortiz
parent c48bf153f2
commit 1fe17a24e2
2 changed files with 21 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/mfd/wm831x-irq.c
View File

@ -413,22 +413,25 @@ static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
* do the update here as we can be called with the bus lock
* held.
*/
wm831x->gpio_level_low[irq] = false;
wm831x->gpio_level_high[irq] = false;
switch (type) {
case IRQ_TYPE_EDGE_BOTH:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
wm831x->gpio_level[irq] = false;
break;
case IRQ_TYPE_EDGE_RISING:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
wm831x->gpio_level[irq] = false;
break;
case IRQ_TYPE_EDGE_FALLING:
wm831x->gpio_update[irq] = 0x10000;
wm831x->gpio_level[irq] = false;
break;
case IRQ_TYPE_LEVEL_HIGH:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
wm831x->gpio_level[irq] = true;
wm831x->gpio_level_high[irq] = true;
break;
case IRQ_TYPE_LEVEL_LOW:
wm831x->gpio_update[irq] = 0x10000;
wm831x->gpio_level_low[irq] = true;
break;
default:
return -EINVAL;
@ -517,7 +520,7 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
* status. This is sucky but improves interoperability.
*/
if (primary == WM831X_GP_INT &&
wm831x->gpio_level[i - WM831X_IRQ_GPIO_1]) {
wm831x->gpio_level_high[i - WM831X_IRQ_GPIO_1]) {
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
@ -526,6 +529,17 @@ static irqreturn_t wm831x_irq_thread(int irq, void *data)
WM831X_GPIO_LEVEL);
}
}
if (primary == WM831X_GP_INT &&
wm831x->gpio_level_low[i - WM831X_IRQ_GPIO_1]) {
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
while (!(ret & 1 << (i - WM831X_IRQ_GPIO_1))) {
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
i));
ret = wm831x_reg_read(wm831x,
WM831X_GPIO_LEVEL);
}
}
}
out:

3
include/linux/mfd/wm831x/core.h
View File

@ -384,7 +384,8 @@ struct wm831x {
/* Used by the interrupt controller code to post writes */
int gpio_update[WM831X_NUM_GPIO_REGS];
bool gpio_level[WM831X_NUM_GPIO_REGS];
bool gpio_level_high[WM831X_NUM_GPIO_REGS];
bool gpio_level_low[WM831X_NUM_GPIO_REGS];
struct mutex auxadc_lock;
struct list_head auxadc_pending;