gpio: Add support for stmpe variant 801

STMPE801 is a GPIO expander. GPIO registers for 801 are slightly different from other
variants. This patch adds support for STMPE801 in stmpe gpio driver.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@st.com>
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 22 insertions, 3 deletions

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 4c980b573328..87a68a896abf 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -65,7 +65,14 @@ static void stmpe_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
         u8 reg = stmpe->regs[which] - (offset / 8);
         u8 mask = 1 << (offset % 8);
 
-        stmpe_reg_write(stmpe, reg, mask);
+        /*
+         * Some variants have single register for gpio set/clear functionality.
+         * For them we need to write 0 to clear and 1 to set.
+         */
+        if (stmpe->regs[STMPE_IDX_GPSR_LSB] == stmpe->regs[STMPE_IDX_GPCR_LSB])
+                stmpe_set_bits(stmpe, reg, mask, val ? mask : 0);
+        else
+                stmpe_reg_write(stmpe, reg, mask);
 }
 
 static int stmpe_gpio_direction_output(struct gpio_chip *chip,
@@ -132,6 +139,10 @@ static int stmpe_gpio_irq_set_type(struct irq_data *d, unsigned int type)
         if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
                 return -EINVAL;
 
+        /* STMPE801 doesn't have RE and FE registers */
+        if (stmpe_gpio->stmpe->partnum == STMPE801)
+                return 0;
+
         if (type == IRQ_TYPE_EDGE_RISING)
                 stmpe_gpio->regs[REG_RE][regoffset] |= mask;
         else
@@ -165,6 +176,11 @@ static void stmpe_gpio_irq_sync_unlock(struct irq_data *d)
         int i, j;
 
         for (i = 0; i < CACHE_NR_REGS; i++) {
+                /* STMPE801 doesn't have RE and FE registers */
+                if ((stmpe->partnum == STMPE801) &&
+                                (i != REG_IE))
+                        continue;
+
                 for (j = 0; j < num_banks; j++) {
                         u8 old = stmpe_gpio->oldregs[i][j];
                         u8 new = stmpe_gpio->regs[i][j];
@@ -241,8 +257,11 @@ static irqreturn_t stmpe_gpio_irq(int irq, void *dev)
                 }
 
                 stmpe_reg_write(stmpe, statmsbreg + i, status[i]);
-                stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB] + i,
-                                status[i]);
+
+                /* Edge detect register is not present on 801 */
+                if (stmpe->partnum != STMPE801)
+                        stmpe_reg_write(stmpe, stmpe->regs[STMPE_IDX_GPEDR_MSB]
+                                        + i, status[i]);
         }
 
         return IRQ_HANDLED;