diff options
| author | Viresh Kumar <viresh.kumar@st.com> | 2011-12-14 07:58:27 +0400 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-01-09 03:37:44 +0400 |
| commit | cccdceb938b37a415c42a0635b8a19893a3a19bb (patch) | |
| tree | 2a6deedeb257a4cd3c39844258c67a1ea30d6b56 /drivers/gpio/gpio-stmpe.c | |
| parent | 7f7f4ea15ef4645f3888310a7a761fc2c4f689c9 (diff) | |
| download | linux-cccdceb938b37a415c42a0635b8a19893a3a19bb.tar.xz | |
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>
Diffstat (limited to 'drivers/gpio/gpio-stmpe.c')
| -rw-r--r-- | drivers/gpio/gpio-stmpe.c | 25 |
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; |