USB: TWL: disable VUSB regulators when cable unplugged
This patch disables USB regulators VUSB1V5, VUSB1V8, and VUSB3V1
when the USB cable is unplugged to reduce power consumption.
Added a depencency from twl4030 usb driver to TWL_REGULATOR.
Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index fc1ca03..aa884d0 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -43,7 +43,7 @@
config TWL4030_USB
tristate "TWL4030 USB Transceiver Driver"
- depends on TWL4030_CORE
+ depends on TWL4030_CORE && REGULATOR_TWL4030
select USB_OTG_UTILS
help
Enable this to support the USB OTG transceiver on TWL4030
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
index 416e441..d9478d0 100644
--- a/drivers/usb/otg/twl4030-usb.c
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -34,6 +34,8 @@
#include <linux/delay.h>
#include <linux/usb/otg.h>
#include <linux/i2c/twl4030.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
/* Register defines */
@@ -246,6 +248,11 @@
struct otg_transceiver otg;
struct device *dev;
+ /* TWL4030 internal USB regulator supplies */
+ struct regulator *usb1v5;
+ struct regulator *usb1v8;
+ struct regulator *usb3v1;
+
/* for vbus reporting with irqs disabled */
spinlock_t lock;
@@ -434,6 +441,18 @@
pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
if (on) {
+ regulator_enable(twl->usb3v1);
+ regulator_enable(twl->usb1v8);
+ /*
+ * Disabling usb3v1 regulator (= writing 0 to VUSB3V1_DEV_GRP
+ * in twl4030) resets the VUSB_DEDICATED2 register. This reset
+ * enables VUSB3V1_SLEEP bit that remaps usb3v1 ACTIVE state to
+ * SLEEP. We work around this by clearing the bit after usv3v1
+ * is re-activated. This ensures that VUSB3V1 is really active.
+ */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0,
+ VUSB_DEDICATED2);
+ regulator_enable(twl->usb1v5);
pwr &= ~PHY_PWR_PHYPWD;
WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
twl4030_usb_write(twl, PHY_CLK_CTRL,
@@ -443,6 +462,9 @@
} else {
pwr |= PHY_PWR_PHYPWD;
WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+ regulator_disable(twl->usb1v5);
+ regulator_disable(twl->usb1v8);
+ regulator_disable(twl->usb3v1);
}
}
@@ -468,7 +490,7 @@
twl->asleep = 0;
}
-static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
+static int twl4030_usb_ldo_init(struct twl4030_usb *twl)
{
/* Enable writing to power configuration registers */
twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
@@ -480,20 +502,45 @@
/* input to VUSB3V1 LDO is from VBAT, not VBUS */
twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
- /* turn on 3.1V regulator */
- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
+ /* Initialize 3.1V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_DEV_GRP);
+
+ twl->usb3v1 = regulator_get(twl->dev, "usb3v1");
+ if (IS_ERR(twl->usb3v1))
+ return -ENODEV;
+
twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
- /* turn on 1.5V regulator */
- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
+ /* Initialize 1.5V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_DEV_GRP);
+
+ twl->usb1v5 = regulator_get(twl->dev, "usb1v5");
+ if (IS_ERR(twl->usb1v5))
+ goto fail1;
+
twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
- /* turn on 1.8V regulator */
- twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
+ /* Initialize 1.8V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_DEV_GRP);
+
+ twl->usb1v8 = regulator_get(twl->dev, "usb1v8");
+ if (IS_ERR(twl->usb1v8))
+ goto fail2;
+
twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
/* disable access to power configuration registers */
twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
+
+ return 0;
+
+fail2:
+ regulator_put(twl->usb1v5);
+ twl->usb1v5 = NULL;
+fail1:
+ regulator_put(twl->usb3v1);
+ twl->usb3v1 = NULL;
+ return -ENODEV;
}
static ssize_t twl4030_usb_vbus_show(struct device *dev,
@@ -598,7 +645,7 @@
{
struct twl4030_usb_data *pdata = pdev->dev.platform_data;
struct twl4030_usb *twl;
- int status;
+ int status, err;
if (!pdata) {
dev_dbg(&pdev->dev, "platform_data not available\n");
@@ -622,7 +669,12 @@
/* init spinlock for workqueue */
spin_lock_init(&twl->lock);
- twl4030_usb_ldo_init(twl);
+ err = twl4030_usb_ldo_init(twl);
+ if (err) {
+ dev_err(&pdev->dev, "ldo init failed\n");
+ kfree(twl);
+ return err;
+ }
otg_set_transceiver(&twl->otg);
platform_set_drvdata(pdev, twl);
@@ -688,6 +740,9 @@
twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
twl4030_phy_power(twl, 0);
+ regulator_put(twl->usb1v5);
+ regulator_put(twl->usb1v8);
+ regulator_put(twl->usb3v1);
kfree(twl);