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Subject[PATCH/RFC 2/2] regulator: da9210: Add optional interrupt support
Date
Add optional interrupt support to the da9210 regulator driver, to handle
over-current, under-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>
Cc: devicetree@vger.kernel.org
---
- I do not have access to the da9210 datasheet, but looked at the da9211
driver, hence the RFC status,
- Does there exist any regulator notifier event that corresponds to
DA9210_E_VMAX?
---
.../devicetree/bindings/regulator/da9210.txt | 4 ++
drivers/regulator/da9210-regulator.c | 63 ++++++++++++++++++++++
2 files changed, 67 insertions(+)

diff --git a/Documentation/devicetree/bindings/regulator/da9210.txt b/Documentation/devicetree/bindings/regulator/da9210.txt
index 3297c53cb9152395..7aa9b1fa6b21ca18 100644
--- a/Documentation/devicetree/bindings/regulator/da9210.txt
+++ b/Documentation/devicetree/bindings/regulator/da9210.txt
@@ -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.

diff --git a/drivers/regulator/da9210-regulator.c b/drivers/regulator/da9210-regulator.c
index f0489cb9018b4e78..2c60a2d6f3a7a080 100644
--- a/drivers/regulator/da9210-regulator.c
+++ b/drivers/regulator/da9210-regulator.c
@@ -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 +122,43 @@ 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;
+ 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);
+ if (val & DA9210_E_NPWRGOOD)
+ regulator_notifier_call_chain(chip->rdev,
+ REGULATOR_EVENT_UNDER_VOLTAGE,
+ NULL);
+ if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT))
+ regulator_notifier_call_chain(chip->rdev,
+ REGULATOR_EVENT_OVER_TEMP, NULL);
+ if (val) {
+ /* Clear all events */
+ error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, val);
+ 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 +207,30 @@ 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, 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);

--
1.9.1


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