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

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Message-Id: <1412711104-15902-2-git-send-email-romain.perier@gmail.com>
Date:	Tue,  7 Oct 2014 19:45:02 +0000
From:	Romain Perier <romain.perier@...il.com>
To:	devicetree@...r.kernel.org
Cc:	broonie@...nel.org, lgirdwood@...il.com,
	linux-kernel@...r.kernel.org, heiko@...ech.de,
	sameo@...ux.intel.com, lee.jones@...aro.org,
	grant.likely@...aro.org, robh@...nel.org, sre@...nel.org,
	dbaryshkov@...il.com, dwmw2@...radead.org, anton@...msg.org,
	ldewangan@...dia.com, linux-omap@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: [RFC PATCH v2 2/4] 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@...il.com>
---
 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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