On Sun, 2009-02-08 at 10:52 -0800, David Brownell wrote:
> From: Kalle Jokiniemi <kalle.jokiniemi@xxxxxxxxx>
>
> This patch disables LDO regulators VUSB1V5, VUSB1V8, and VUSB3V1
> when the USB cable is unplugged, to eliminate that source of power
> waste. (Enabled LDOs consume power at all times.)
Please put this on hold for a while. This won't work if we don't have
TWL regulator support enabled. Also it's missing error value checking.
I'll post new patch(es) soon.
- Kalle
>
> Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@xxxxxxxxx>
> Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
> ---
> Depends on the twl4030 regulator driver, so I'm suggesting this
> be merged (with that driver) through the regulator patch queue
> to simplify things.
>
> drivers/usb/otg/twl4030-usb.c | 30 ++++++++++++++++++++++++------
> 1 file changed, 24 insertions(+), 6 deletions(-)
>
> --- a/drivers/usb/otg/twl4030-usb.c
> +++ b/drivers/usb/otg/twl4030-usb.c
> @@ -34,6 +34,7 @@
> #include <linux/delay.h>
> #include <linux/usb/otg.h>
> #include <linux/i2c/twl4030.h>
> +#include <linux/regulator/consumer.h>
>
>
> /* Register defines */
> @@ -246,6 +247,11 @@ struct twl4030_usb {
> 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 +440,9 @@ static void twl4030_phy_power(struct twl
>
> pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
> if (on) {
> + regulator_enable(twl->usb1v5);
> + regulator_enable(twl->usb1v8);
> + regulator_enable(twl->usb3v1);
> 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 +452,9 @@ static void twl4030_phy_power(struct twl
> } 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);
> }
> }
>
> @@ -480,16 +492,19 @@ static void twl4030_usb_ldo_init(struct
> /* 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");
> 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");
> 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");
> twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
>
> /* disable access to power configuration registers */
> @@ -688,6 +703,9 @@ static int __exit twl4030_usb_remove(str
> 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);
>
--
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