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mfd: Add support for no-interrupt stmpe config

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Adds support for boards which have an STMPE device without the
interrupt pin connected.

Acked-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Chris Blair <chris.blair@stericsson.com>
Tested-by: Michel Jaouen <michel.jaouen@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Chris Blair 2012-01-26 22:17:03 +01:00 committed by Samuel Ortiz
parent 0dc299a3c4
commit e31f9b8264
2 changed files with 97 additions and 38 deletions
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134
drivers/mfd/stmpe.c
View file

@ -298,6 +298,11 @@ static struct mfd_cell stmpe_gpio_cell = {
.num_resources = ARRAY_SIZE(stmpe_gpio_resources),
};
static struct mfd_cell stmpe_gpio_cell_noirq = {
.name = "stmpe-gpio",
/* gpio cell resources consist of an irq only so no resources here */
};
/*
* Keypad (1601, 2401, 2403)
*/
@ -346,6 +351,13 @@ static struct stmpe_variant_block stmpe801_blocks[] = {
},
};
static struct stmpe_variant_block stmpe801_blocks_noirq[] = {
{
.cell = &stmpe_gpio_cell_noirq,
.block = STMPE_BLOCK_GPIO,
},
};
static int stmpe801_enable(struct stmpe *stmpe, unsigned int blocks,
bool enable)
{
@ -367,6 +379,17 @@ static struct stmpe_variant_info stmpe801 = {
.enable = stmpe801_enable,
};
static struct stmpe_variant_info stmpe801_noirq = {
.name = "stmpe801",
.id_val = STMPE801_ID,
.id_mask = 0xffff,
.num_gpios = 8,
.regs = stmpe801_regs,
.blocks = stmpe801_blocks_noirq,
.num_blocks = ARRAY_SIZE(stmpe801_blocks_noirq),
.enable = stmpe801_enable,
};
/*
* Touchscreen (STMPE811 or STMPE610)
*/
@ -712,7 +735,7 @@ static struct stmpe_variant_info stmpe2403 = {
.enable_autosleep = stmpe1601_autosleep, /* same as stmpe1601 */
};
static struct stmpe_variant_info *stmpe_variant_info[] = {
static struct stmpe_variant_info *stmpe_variant_info[STMPE_NBR_PARTS] = {
[STMPE610] = &stmpe610,
[STMPE801] = &stmpe801,
[STMPE811] = &stmpe811,
@ -721,6 +744,16 @@ static struct stmpe_variant_info *stmpe_variant_info[] = {
[STMPE2403] = &stmpe2403,
};
/*
* These devices can be connected in a 'no-irq' configuration - the irq pin
* is not used and the device cannot interrupt the CPU. Here we only list
* devices which support this configuration - the driver will fail probing
* for any devices not listed here which are configured in this way.
*/
static struct stmpe_variant_info *stmpe_noirq_variant_info[STMPE_NBR_PARTS] = {
[STMPE801] = &stmpe801_noirq,
};
static irqreturn_t stmpe_irq(int irq, void *data)
{
struct stmpe *stmpe = data;
@ -864,7 +897,7 @@ 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;
u8 icr = 0;
unsigned int id;
u8 data[2];
int ret;
@ -887,31 +920,33 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe)
if (ret)
return ret;
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) {
if (stmpe->irq >= 0) {
if (id == STMPE801_ID)
icr |= STMPE801_REG_SYS_CTRL_INT_HI;
icr = STMPE801_REG_SYS_CTRL_INT_EN;
else
icr |= STMPE_ICR_LSB_HIGH;
}
icr = STMPE_ICR_LSB_GIM;
if (stmpe->pdata->irq_invert_polarity) {
if (id == STMPE801_ID)
icr ^= STMPE801_REG_SYS_CTRL_INT_HI;
else
icr ^= STMPE_ICR_LSB_HIGH;
/* 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) {
if (id == STMPE801_ID)
icr |= STMPE801_REG_SYS_CTRL_INT_HI;
else
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) {
@ -1001,19 +1036,38 @@ int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
stmpe->irq = ci->irq;
}
if (stmpe->irq < 0) {
/* use alternate variant info for no-irq mode, if supported */
dev_info(stmpe->dev,
"%s configured in no-irq mode by platform data\n",
stmpe->variant->name);
if (!stmpe_noirq_variant_info[stmpe->partnum]) {
dev_err(stmpe->dev,
"%s does not support no-irq mode!\n",
stmpe->variant->name);
ret = -ENODEV;
goto free_gpio;
}
stmpe->variant = stmpe_noirq_variant_info[stmpe->partnum];
}
ret = stmpe_chip_init(stmpe);
if (ret)
goto free_gpio;
ret = stmpe_irq_init(stmpe);
if (ret)
goto free_gpio;
if (stmpe->irq >= 0) {
ret = stmpe_irq_init(stmpe);
if (ret)
goto free_gpio;
ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
pdata->irq_trigger | IRQF_ONESHOT, "stmpe", stmpe);
if (ret) {
dev_err(stmpe->dev, "failed to request IRQ: %d\n", ret);
goto out_removeirq;
ret = request_threaded_irq(stmpe->irq, NULL, stmpe_irq,
pdata->irq_trigger | IRQF_ONESHOT,
"stmpe", stmpe);
if (ret) {
dev_err(stmpe->dev, "failed to request IRQ: %d\n",
ret);
goto out_removeirq;
}
}
ret = stmpe_devices_init(stmpe);
@ -1026,9 +1080,11 @@ int __devinit stmpe_probe(struct stmpe_client_info *ci, int partnum)
out_removedevs:
mfd_remove_devices(stmpe->dev);
free_irq(stmpe->irq, stmpe);
if (stmpe->irq >= 0)
free_irq(stmpe->irq, stmpe);
out_removeirq:
stmpe_irq_remove(stmpe);
if (stmpe->irq >= 0)
stmpe_irq_remove(stmpe);
free_gpio:
if (pdata->irq_over_gpio)
gpio_free(pdata->irq_gpio);
@ -1041,8 +1097,10 @@ int stmpe_remove(struct stmpe *stmpe)
{
mfd_remove_devices(stmpe->dev);
free_irq(stmpe->irq, stmpe);
stmpe_irq_remove(stmpe);
if (stmpe->irq >= 0) {
free_irq(stmpe->irq, stmpe);
stmpe_irq_remove(stmpe);
}
if (stmpe->pdata->irq_over_gpio)
gpio_free(stmpe->pdata->irq_gpio);
@ -1057,7 +1115,7 @@ static int stmpe_suspend(struct device *dev)
{
struct stmpe *stmpe = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
if (stmpe->irq >= 0 && device_may_wakeup(dev))
enable_irq_wake(stmpe->irq);
return 0;
@ -1067,7 +1125,7 @@ static int stmpe_resume(struct device *dev)
{
struct stmpe *stmpe = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
if (stmpe->irq >= 0 && device_may_wakeup(dev))
disable_irq_wake(stmpe->irq);
return 0;

1
include/linux/mfd/stmpe.h
View file

@ -26,6 +26,7 @@ enum stmpe_partnum {
STMPE1601,
STMPE2401,
STMPE2403,
STMPE_NBR_PARTS
};
/*