[PATCH v4 07/18] staging: mt7621-gpio: implement high level and low level irqs

[Sergio Paracuellos]

This chip support high level and low level interrupts. Those
have to be implemented also to get a complete and clean driver.

Signed-off-by: Sergio Paracuellos <sergio.paracuel...@gmail.com>
---
 drivers/staging/mt7621-gpio/gpio-mt7621.c | 47 ++++++++++++++++++++++++-------
 1 file changed, 37 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/mt7621-gpio/gpio-mt7621.c 
b/drivers/staging/mt7621-gpio/gpio-mt7621.c
index 54c18c1..0c344a5 100644
--- a/drivers/staging/mt7621-gpio/gpio-mt7621.c
+++ b/drivers/staging/mt7621-gpio/gpio-mt7621.c
@@ -38,6 +38,8 @@
  * @bank: gpio bank number for the chip
  * @rising: mask for rising irqs
  * @falling: mask for falling irqs
+ * @hlevel: mask for high level irqs
+ * @llevel: mask for low level irqs
  */
 struct mtk_gc {
        struct gpio_chip chip;
@@ -45,6 +47,8 @@ struct mtk_gc {
        int bank;
        u32 rising;
        u32 falling;
+       u32 hlevel;
+       u32 llevel;
 };
 
 /**
@@ -184,7 +188,7 @@ mediatek_gpio_irq_unmask(struct irq_data *d)
        int bank = pin / MTK_BANK_WIDTH;
        struct mtk_gc *rg = &gpio_data->gc_map[bank];
        unsigned long flags;
-       u32 rise, fall;
+       u32 rise, fall, high, low;
 
        if (!rg)
                return;
@@ -192,8 +196,12 @@ mediatek_gpio_irq_unmask(struct irq_data *d)
        spin_lock_irqsave(&rg->lock, flags);
        rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
        fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
+       high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
+       low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
        mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (PIN_MASK(pin) & rg->rising));
        mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (PIN_MASK(pin) & rg->falling));
+       mtk_gpio_w32(rg, GPIO_REG_HLVL, high | (PIN_MASK(pin) & rg->hlevel));
+       mtk_gpio_w32(rg, GPIO_REG_LLVL, low | (PIN_MASK(pin) & rg->llevel));
        spin_unlock_irqrestore(&rg->lock, flags);
 }
 
@@ -205,7 +213,7 @@ mediatek_gpio_irq_mask(struct irq_data *d)
        int bank = pin / MTK_BANK_WIDTH;
        struct mtk_gc *rg = &gpio_data->gc_map[bank];
        unsigned long flags;
-       u32 rise, fall;
+       u32 rise, fall, high, low;
 
        if (!rg)
                return;
@@ -213,8 +221,12 @@ mediatek_gpio_irq_mask(struct irq_data *d)
        spin_lock_irqsave(&rg->lock, flags);
        rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
        fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
+       high = mtk_gpio_r32(rg, GPIO_REG_HLVL);
+       low = mtk_gpio_r32(rg, GPIO_REG_LLVL);
        mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~PIN_MASK(pin));
        mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~PIN_MASK(pin));
+       mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~PIN_MASK(pin));
+       mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~PIN_MASK(pin));
        spin_unlock_irqrestore(&rg->lock, flags);
 }
 
@@ -231,21 +243,36 @@ mediatek_gpio_irq_type(struct irq_data *d, unsigned int 
type)
                return -1;
 
        if (type == IRQ_TYPE_PROBE) {
-               if ((rg->rising | rg->falling) & mask)
+               if ((rg->rising | rg->falling |
+                    rg->hlevel | rg->llevel) & mask)
                        return 0;
 
                type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
        }
 
-       if (type & IRQ_TYPE_EDGE_RISING)
-               rg->rising |= mask;
-       else
-               rg->rising &= ~mask;
+       rg->rising &= ~mask;
+       rg->falling &= ~mask;
+       rg->hlevel &= ~mask;
+       rg->llevel &= ~mask;
 
-       if (type & IRQ_TYPE_EDGE_FALLING)
+       switch (type & IRQ_TYPE_SENSE_MASK) {
+       case IRQ_TYPE_EDGE_BOTH:
+               rg->rising |= mask;
                rg->falling |= mask;
-       else
-               rg->falling &= ~mask;
+               break;
+       case IRQ_TYPE_EDGE_RISING:
+               rg->rising |= mask;
+               break;
+       case IRQ_TYPE_EDGE_FALLING:
+               rg->falling |= mask;
+               break;
+       case IRQ_TYPE_LEVEL_HIGH:
+               rg->hlevel |= mask;
+               break;
+       case IRQ_TYPE_LEVEL_LOW:
+               rg->llevel |= mask;
+               break;
+       }
 
        return 0;
 }
-- 
2.7.4

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