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>

2 files changed, 79 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/regulator/da9210.txt b/Documentation/devicetree/bindings/regulator/da9210.txt
index 3297c53cb915..7aa9b1fa6b21 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 f0489cb9018b..8e39f7457bc3 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 +122,55 @@ 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);