regulator: act8865: Add support to turn off all outputs

When the property "poweroff-source" is found in the
devicetree, the function pm_power_off is defined. This function sends the
rights bit fields to the global off control register. shutdown/poweroff
commands are now supported for hardware components which use these PMU.

Signed-off-by: Romain Perier <romain.perier@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c
index afd06f92dfdf..76301ed0f8d4 100644
--- a/drivers/regulator/act8865-regulator.c
+++ b/drivers/regulator/act8865-regulator.c
@@ -61,6 +61,8 @@
 #define ACT8846_REG12_VSET      0xa0
 #define ACT8846_REG12_CTRL      0xa1
 #define ACT8846_REG13_CTRL      0xb1
+#define ACT8846_GLB_OFF_CTRL    0xc3
+#define ACT8846_OFF_SYSMASK     0x18
 
 /*
  * ACT8865 Global Register Map.
@@ -84,6 +86,7 @@
 #define ACT8865_LDO3_CTRL       0x61
 #define ACT8865_LDO4_VSET       0x64
 #define ACT8865_LDO4_CTRL       0x65
+#define ACT8865_MSTROFF         0x20
 
 /*
  * Field Definitions.
@@ -98,6 +101,8 @@
 
 struct act8865 {
         struct regmap *regmap;
+        int off_reg;
+        int off_mask;
 };
 
 static const struct regmap_config act8865_regmap_config = {
@@ -275,6 +280,16 @@ static struct regulator_init_data
         return NULL;
 }
 
+static struct i2c_client *act8865_i2c_client;
+static void act8865_power_off(void)
+{
+        struct act8865 *act8865;
+
+        act8865 = i2c_get_clientdata(act8865_i2c_client);
+        regmap_write(act8865->regmap, act8865->off_reg, act8865->off_mask);
+        while (1);
+}
+
 static int act8865_pmic_probe(struct i2c_client *client,
                               const struct i2c_device_id *i2c_id)
 {
@@ -285,6 +300,7 @@ static int act8865_pmic_probe(struct i2c_client *client,
         int i, ret, num_regulators;
         struct act8865 *act8865;
         unsigned long type;
+        int off_reg, off_mask;
 
         pdata = dev_get_platdata(dev);
 
@@ -304,10 +320,14 @@ static int act8865_pmic_probe(struct i2c_client *client,
         case ACT8846:
                 regulators = act8846_regulators;
                 num_regulators = ARRAY_SIZE(act8846_regulators);
+                off_reg = ACT8846_GLB_OFF_CTRL;
+                off_mask = ACT8846_OFF_SYSMASK;
                 break;
         case ACT8865:
                 regulators = act8865_regulators;
                 num_regulators = ARRAY_SIZE(act8865_regulators);
+                off_reg = ACT8865_SYS_CTRL;
+                off_mask = ACT8865_MSTROFF;
                 break;
         default:
                 dev_err(dev, "invalid device id %lu\n", type);
@@ -345,6 +365,17 @@ static int act8865_pmic_probe(struct i2c_client *client,
                 return ret;
         }
 
+        if (of_system_has_poweroff_source(dev->of_node)) {
+                if (!pm_power_off) {
+                        act8865_i2c_client = client;
+                        act8865->off_reg = off_reg;
+                        act8865->off_mask = off_mask;
+                        pm_power_off = act8865_power_off;
+                } else {
+                        dev_err(dev, "Failed to set poweroff capability, already defined\n");
+                }
+        }
+
         /* Finally register devices */
         for (i = 0; i < num_regulators; i++) {
                 const struct regulator_desc *desc = &regulators[i];