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Subject[PATCH V2 4/5] mfd/stmpe: ADD support for stmpe variant 801
Date
STMPE801 is a GPIO expander. Registers for 801 are much different from other
variants. This patch adds support for STMPE801 in stmpe mfd 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>
---
drivers/mfd/stmpe-i2c.c | 1 +
drivers/mfd/stmpe-spi.c | 1 +
drivers/mfd/stmpe.c | 97 +++++++++++++++++++++++++++++++++++++++------
drivers/mfd/stmpe.h | 19 +++++++++
include/linux/mfd/stmpe.h | 1 +
5 files changed, 106 insertions(+), 13 deletions(-)
diff --git a/drivers/mfd/stmpe-i2c.c b/drivers/mfd/stmpe-i2c.c
index b11d33b..373f423 100644
--- a/drivers/mfd/stmpe-i2c.c
+++ b/drivers/mfd/stmpe-i2c.c
@@ -72,6 +72,7 @@ static int __devexit stmpe_i2c_remove(struct i2c_client *i2c)

static const struct i2c_device_id stmpe_i2c_id[] = {
{ "stmpe610", STMPE610 },
+ { "stmpe801", STMPE801 },
{ "stmpe811", STMPE811 },
{ "stmpe1601", STMPE1601 },
{ "stmpe2401", STMPE2401 },
diff --git a/drivers/mfd/stmpe-spi.c b/drivers/mfd/stmpe-spi.c
index 46963a5..b58c43c 100644
--- a/drivers/mfd/stmpe-spi.c
+++ b/drivers/mfd/stmpe-spi.c
@@ -110,6 +110,7 @@ static int __devexit stmpe_spi_remove(struct spi_device *spi)

static const struct spi_device_id stmpe_spi_id[] = {
{ "stmpe610", STMPE610 },
+ { "stmpe801", STMPE801 },
{ "stmpe811", STMPE811 },
{ "stmpe1601", STMPE1601 },
{ "stmpe2401", STMPE2401 },
diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 67ff3dc..fc2c6af 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -241,12 +241,14 @@ int stmpe_set_altfunc(struct stmpe *stmpe, u32 pins, enum stmpe_block block)
u8 regaddr = stmpe->regs[STMPE_IDX_GPAFR_U_MSB];
int af_bits = variant->af_bits;
int numregs = DIV_ROUND_UP(stmpe->num_gpios * af_bits, 8);
- int afperreg = 8 / af_bits;
int mask = (1 << af_bits) - 1;
u8 regs[numregs];
- int af;
- int ret;
+ int af, afperreg, ret;
+
+ if (!variant->get_altfunc)
+ return 0;

+ afperreg = 8 / af_bits;
mutex_lock(&stmpe->lock);

ret = __stmpe_enable(stmpe, STMPE_BLOCK_GPIO);
@@ -321,6 +323,50 @@ static struct mfd_cell stmpe_keypad_cell = {
};

/*
+ * STMPE801
+ */
+static const u8 stmpe801_regs[] = {
+ [STMPE_IDX_CHIP_ID] = STMPE801_REG_CHIP_ID,
+ [STMPE_IDX_ICR_LSB] = STMPE801_REG_SYS_CTRL,
+ [STMPE_IDX_GPMR_LSB] = STMPE801_REG_GPIO_MP_STA,
+ [STMPE_IDX_GPSR_LSB] = STMPE801_REG_GPIO_SET_PIN,
+ [STMPE_IDX_GPCR_LSB] = STMPE801_REG_GPIO_SET_PIN,
+ [STMPE_IDX_GPDR_LSB] = STMPE801_REG_GPIO_DIR,
+ [STMPE_IDX_IEGPIOR_LSB] = STMPE801_REG_GPIO_INT_EN,
+ [STMPE_IDX_ISGPIOR_MSB] = STMPE801_REG_GPIO_INT_STA,
+
+};
+
+static struct stmpe_variant_block stmpe801_blocks[] = {
+ {
+ .cell = &stmpe_gpio_cell,
+ .irq = 0,
+ .block = STMPE_BLOCK_GPIO,
+ },
+};
+
+static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
+ bool enable)
+{
+ if (blocks & STMPE_BLOCK_GPIO)
+ return 0;
+ else
+ return -EINVAL;
+}
+
+static struct stmpe_variant_info stmpe801 = {
+ .name = "stmpe801",
+ .id_val = STMPE801_ID,
+ .id_mask = 0xffff,
+ .num_gpios = 8,
+ .regs = stmpe801_regs,
+ .blocks = stmpe801_blocks,
+ .num_blocks = ARRAY_SIZE(stmpe801_blocks),
+ .num_irqs = STMPE801_NR_INTERNAL_IRQS,
+ .enable = stmpe801_enable,
+};
+
+/*
* Touchscreen (STMPE811 or STMPE610)
*/

@@ -667,6 +713,7 @@ static struct stmpe_variant_info stmpe2403 = {

static struct stmpe_variant_info *stmpe_variant_info[] = {
[STMPE610] = &stmpe610,
+ [STMPE801] = &stmpe801,
[STMPE811] = &stmpe811,
[STMPE1601] = &stmpe1601,
[STMPE2401] = &stmpe2401,
@@ -683,6 +730,11 @@ static irqreturn_t stmpe_irq(int irq, void *data)
int ret;
int i;

+ if (variant->id_val == STMPE801_ID) {
+ handle_nested_irq(stmpe->irq_base);
+ return IRQ_HANDLED;
+ }
+
ret = stmpe_block_read(stmpe, israddr, num, isr);
if (ret < 0)
return IRQ_NONE;
@@ -769,14 +821,17 @@ static struct irq_chip stmpe_irq_chip = {

static int __devinit stmpe_irq_init(struct stmpe *stmpe)
{
+ struct irq_chip *chip = NULL;
int num_irqs = stmpe->variant->num_irqs;
int base = stmpe->irq_base;
int irq;

+ if (stmpe->variant->id_val != STMPE801_ID)
+ chip = &stmpe_irq_chip;
+
for (irq = base; irq < base + num_irqs; irq++) {
irq_set_chip_data(irq, stmpe);
- irq_set_chip_and_handler(irq, &stmpe_irq_chip,
- handle_edge_irq);
+ irq_set_chip_and_handler(irq, chip, handle_edge_irq);
irq_set_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
@@ -808,7 +863,7 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe)
unsigned int irq_trigger = stmpe->pdata->irq_trigger;
int autosleep_timeout = stmpe->pdata->autosleep_timeout;
struct stmpe_variant_info *variant = stmpe->variant;
- u8 icr = STMPE_ICR_LSB_GIM;
+ u8 icr;
unsigned int id;
u8 data[2];
int ret;
@@ -831,16 +886,32 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe)
if (ret)
return ret;

- if (irq_trigger == IRQF_TRIGGER_FALLING ||
- irq_trigger == IRQF_TRIGGER_RISING)
- icr |= STMPE_ICR_LSB_EDGE;
+ if (id == STMPE801_ID)
+ icr = STMPE801_REG_SYS_CTRL_INT_EN;
+ else
+ icr = STMPE_ICR_LSB_GIM;
+
+ /* STMPE801 doesn't support Edge interrupts */
+ if (id != STMPE801_ID) {
+ if (irq_trigger == IRQF_TRIGGER_FALLING ||
+ irq_trigger == IRQF_TRIGGER_RISING)
+ icr |= STMPE_ICR_LSB_EDGE;
+ }

if (irq_trigger == IRQF_TRIGGER_RISING ||
- irq_trigger == IRQF_TRIGGER_HIGH)
- icr |= STMPE_ICR_LSB_HIGH;
+ irq_trigger == IRQF_TRIGGER_HIGH) {
+ if (id == STMPE801_ID)
+ icr |= STMPE801_REG_SYS_CTRL_INT_HI;
+ else
+ icr |= STMPE_ICR_LSB_HIGH;
+ }

- if (stmpe->pdata->irq_invert_polarity)
- icr ^= STMPE_ICR_LSB_HIGH;
+ if (stmpe->pdata->irq_invert_polarity) {
+ if (id == STMPE801_ID)
+ icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
+ else
+ icr ^= STMPE_ICR_LSB_HIGH;
+ }

if (stmpe->pdata->autosleep) {
ret = stmpe_autosleep(stmpe, autosleep_timeout);
diff --git a/drivers/mfd/stmpe.h b/drivers/mfd/stmpe.h
index a73f4c1..7b8e13f 100644
--- a/drivers/mfd/stmpe.h
+++ b/drivers/mfd/stmpe.h
@@ -105,6 +105,25 @@ int stmpe_remove(struct stmpe *stmpe);
#define STMPE_ICR_LSB_GIM (1 << 0)

/*
+ * STMPE801
+ */
+#define STMPE801_ID 0x0108
+#define STMPE801_NR_INTERNAL_IRQS 1
+
+#define STMPE801_REG_CHIP_ID 0x00
+#define STMPE801_REG_VERSION_ID 0x02
+#define STMPE801_REG_SYS_CTRL 0x04
+#define STMPE801_REG_GPIO_INT_EN 0x08
+#define STMPE801_REG_GPIO_INT_STA 0x09
+#define STMPE801_REG_GPIO_MP_STA 0x10
+#define STMPE801_REG_GPIO_SET_PIN 0x11
+#define STMPE801_REG_GPIO_DIR 0x12
+
+#define STMPE801_REG_SYS_CTRL_RESET (1 << 7)
+#define STMPE801_REG_SYS_CTRL_INT_EN (1 << 2)
+#define STMPE801_REG_SYS_CTRL_INT_HI (1 << 0)
+
+/*
* STMPE811
*/

diff --git a/include/linux/mfd/stmpe.h b/include/linux/mfd/stmpe.h
index 342005a..ca1d7a3 100644
--- a/include/linux/mfd/stmpe.h
+++ b/include/linux/mfd/stmpe.h
@@ -21,6 +21,7 @@ enum stmpe_block {

enum stmpe_partnum {
STMPE610,
+ STMPE801,
STMPE811,
STMPE1601,
STMPE2401,
--
1.7.2.2


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