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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>
hifive-unleashed-5.1
Viresh Kumar 2011-12-14 09:28:27 +05:30 committed by Samuel Ortiz
parent 7f7f4ea15e
commit cccdceb938
1 changed files with 22 additions and 3 deletions
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25
drivers/gpio/gpio-stmpe.c
View File

@ -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;