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>
diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 4c980b5..87a68a8 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -65,7 +65,14 @@
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 @@
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 @@
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 @@
}
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;