[PATCH v4 2/3] power: qcom_smbb: Add otg regulator for control of vbus

Tim Bird
2015-12-15T20:11:30Z

Add a regulator to control the OTG chargepath switch. This
is used by USB code to control VBUS direction - out for host mode
on the OTG port, and in for charging mode.

Signed-off-by: Tim Bird <tim.bird@sonymobile.com>
---
Changes since v3:
- changed DT node name to otg-vbus
- removed fixed-voltage setup from otg regulator rdesc
Changes since v1:
- changed name of supply to remove underscores
---
drivers/power/qcom_smbb.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)

diff --git a/drivers/power/qcom_smbb.c b/drivers/power/qcom_smbb.c
index 5eb1e9e..8998f4d 100644
--- a/drivers/power/qcom_smbb.c
+++ b/drivers/power/qcom_smbb.c
@@ -34,6 +34,9 @@
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>

#define SMBB_CHG_VMAX 0x040
#define SMBB_CHG_VSAFE 0x041
@@ -71,6 +74,8 @@
#define BTC_CTRL_HOT_EXT_N BIT(0)

#define SMBB_USB_IMAX 0x344
+#define SMBB_USB_OTG_CTL 0x348
+#define OTG_CTL_EN BIT(0)
#define SMBB_USB_ENUM_TIMER_STOP 0x34e
#define ENUM_TIMER_STOP BIT(0)
#define SMBB_USB_SEC_ACCESS 0x3d0
@@ -123,6 +128,9 @@ struct smbb_charger {
struct power_supply *dc_psy;
struct power_supply *bat_psy;
struct regmap *regmap;
+
+ struct regulator_desc otg_rdesc;
+ struct regulator_dev *otg_reg;
};

static int smbb_vbat_weak_fn(unsigned int index)
@@ -778,12 +786,56 @@ static const struct power_supply_desc dc_psy_desc = {
.property_is_writeable = smbb_charger_writable_property,
};

+static int smbb_chg_otg_enable(struct regulator_dev *rdev)
+{
+ struct smbb_charger *chg = rdev_get_drvdata(rdev);
+ int rc;
+
+ rc = regmap_update_bits(chg->regmap, chg->addr + SMBB_USB_OTG_CTL,
+ OTG_CTL_EN, OTG_CTL_EN);
+ if (rc)
+ dev_err(chg->dev, "failed to update OTG_CTL\n");
+ return rc;
+}
+
+static int smbb_chg_otg_disable(struct regulator_dev *rdev)
+{
+ struct smbb_charger *chg = rdev_get_drvdata(rdev);
+ int rc;
+
+ rc = regmap_update_bits(chg->regmap, chg->addr + SMBB_USB_OTG_CTL,
+ OTG_CTL_EN, 0);
+ if (rc)
+ dev_err(chg->dev, "failed to update OTG_CTL\n");
+ return rc;
+}
+
+static int smbb_chg_otg_is_enabled(struct regulator_dev *rdev)
+{
+ struct smbb_charger *chg = rdev_get_drvdata(rdev);
+ unsigned int value = 0;
+ int rc;
+
+ rc = regmap_read(chg->regmap, chg->addr + SMBB_USB_OTG_CTL, &value);
+ if (rc)
+ dev_err(chg->dev, "failed to read OTG_CTL\n");
+
+ return !!(value & OTG_CTL_EN);
+}
+
+static struct regulator_ops smbb_chg_otg_ops = {
+ .enable = smbb_chg_otg_enable,
+ .disable = smbb_chg_otg_disable,
+ .is_enabled = smbb_chg_otg_is_enabled,
+};
+
static int smbb_charger_probe(struct platform_device *pdev)
{
struct power_supply_config bat_cfg = {};
struct power_supply_config usb_cfg = {};
struct power_supply_config dc_cfg = {};
struct smbb_charger *chg;
+ struct regulator_config config = { };
int rc, i;

chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
@@ -884,6 +936,26 @@ static int smbb_charger_probe(struct platform_device *pdev)
}
}

+ /*
+ * otg regulator is used to control VBUS voltage direction
+ * when USB switches between host and gadget mode
+ */
+ chg->otg_rdesc.id = -1;
+ chg->otg_rdesc.name = "otg-vbus";
+ chg->otg_rdesc.ops = &smbb_chg_otg_ops;
+ chg->otg_rdesc.owner = THIS_MODULE;
+ chg->otg_rdesc.type = REGULATOR_VOLTAGE;
+ chg->otg_rdesc.supply_name = "usb-otg-in";
+ chg->otg_rdesc.of_match = "otg-vbus";
+
+ config.dev = &pdev->dev;
+ config.driver_data = chg;
+
+ chg->otg_reg = devm_regulator_register(&pdev->dev, &chg->otg_rdesc,
+ &config);
+ if (IS_ERR(chg->otg_reg))
+ return PTR_ERR(chg->otg_reg);
+
chg->jeita_ext_temp = of_property_read_bool(pdev->dev.of_node,
"qcom,jeita-extended-temp-range");

--
2.6.3