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regulator: da9210: Add optional interrupt support 

Add optional interrupt support to the da9210 regulator driver, to handle
over-current, under- and over-voltage, and over-temperature events.

Only the interrupt sources for which we handle events are unmasked, to
avoid interrupts we cannot handle.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Geert Uytterhoeven 2015-06-24 14:14:21 +02:00 committed by Mark Brown
parent d770e558e2
commit 4245746037
2 changed files with 79 additions and 0 deletions
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4
Documentation/devicetree/bindings/regulator/da9210.txt
View File

@ -5,6 +5,10 @@ Required properties:
- compatible: must be "dlg,da9210"
- reg: the i2c slave address of the regulator. It should be 0x68.
Optional properties:
- interrupts: a reference to the DA9210 interrupt, if available.
Any standard regulator properties can be used to configure the single da9210
DCDC.

75
drivers/regulator/da9210-regulator.c
View File

@ -22,6 +22,8 @@
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
@ -120,6 +122,55 @@ static int da9210_get_current_limit(struct regulator_dev *rdev)
return da9210_buck_limits[sel];
}
static irqreturn_t da9210_irq_handler(int irq, void *data)
{
struct da9210 *chip = data;
unsigned int val, handled = 0;
int error, ret = IRQ_NONE;
error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
if (error < 0)
goto error_i2c;
if (val & DA9210_E_OVCURR) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_OVER_CURRENT,
NULL);
handled |= DA9210_E_OVCURR;
}
if (val & DA9210_E_NPWRGOOD) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
handled |= DA9210_E_NPWRGOOD;
}
if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_OVER_TEMP, NULL);
handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
}
if (val & DA9210_E_VMAX) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_REGULATION_OUT,
NULL);
handled |= DA9210_E_VMAX;
}
if (handled) {
/* Clear handled events */
error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
if (error < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
return ret;
error_i2c:
dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
return ret;
}
/*
* I2C driver interface functions
*/
@ -168,6 +219,30 @@ static int da9210_i2c_probe(struct i2c_client *i2c,
}
chip->rdev = rdev;
if (i2c->irq) {
error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
da9210_irq_handler,
IRQF_TRIGGER_LOW |
IRQF_ONESHOT | IRQF_SHARED,
"da9210", chip);
if (error) {
dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
i2c->irq, error);
return error;
}
error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
DA9210_M_TEMP_WARN |
DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
if (error < 0) {
dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
error);
return error;
}
} else {
dev_warn(&i2c->dev, "No IRQ configured\n");
}
i2c_set_clientdata(i2c, chip);