[RFC PATCH v2 2/4] regulator: act8865: Add support to turn off all outputs

From: Romain Perier
Date: Tue Oct 07 2014 - 15:42:24 EST


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@xxxxxxxxx>
---
drivers/regulator/act8865-regulator.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/drivers/regulator/act8865-regulator.c b/drivers/regulator/act8865-regulator.c
index afd06f9..8bba591 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 +365,14 @@ static int act8865_pmic_probe(struct i2c_client *client,
return ret;
}

+ if (dev->of_node && is_system_poweroff_source(dev->of_node) &&
+ !pm_power_off) {
+ act8865_i2c_client = client;
+ act8865->off_reg = off_reg;
+ act8865->off_mask = off_mask;
+ pm_power_off = act8865_power_off;
+ }
+
/* Finally register devices */
for (i = 0; i < num_regulators; i++) {
const struct regulator_desc *desc = &regulators[i];
--
1.9.1

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