Commit 3e679bde authored by Linus Walleij's avatar Linus Walleij Committed by Greg Kroah-Hartman
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usb: fotg210-udc: Implement VBUS session 



Implement VBUS session handling for FOTG210. This is
mainly used by the UDC driver which needs to call down to
the FOTG210 core and enable/disable VBUS, as this needs to be
handled outside of the HCD and UDC drivers, by platform
specific glue code.

The Gemini has a special bit in a system register to turn
VBUS on and off so we implement this in the FOTG210 core.

Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-7-100388af9810@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 816f518d

drivers/usb/fotg210/fotg210-core.c

+29 −0
Original line number Diff line number Diff line
@@ -95,6 +95,35 @@ static int fotg210_gemini_init(struct fotg210 *fotg, struct resource *res, 
	return 0;

}



/**

 * fotg210_vbus() - Called by gadget driver to enable/disable VBUS

 * @enable: true to enable VBUS, false to disable VBUS

 */

void fotg210_vbus(struct fotg210 *fotg, bool enable)

{

	u32 mask;

	u32 val;

	int ret;



	switch (fotg->port) {

	case GEMINI_PORT_0:

		mask = GEMINI_MISC_USB0_VBUS_ON;

		val = enable ? GEMINI_MISC_USB0_VBUS_ON : 0;

		break;

	case GEMINI_PORT_1:

		mask = GEMINI_MISC_USB1_VBUS_ON;

		val = enable ? GEMINI_MISC_USB1_VBUS_ON : 0;

		break;

	default:

		return;

	}

	ret = regmap_update_bits(fotg->map, GEMINI_GLOBAL_MISC_CTRL, mask, val);

	if (ret)

		dev_err(fotg->dev, "failed to %s VBUS\n",

			enable ? "enable" : "disable");

	dev_info(fotg->dev, "%s: %s VBUS\n", __func__, enable ? "enable" : "disable");

}



static int fotg210_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

drivers/usb/fotg210/fotg210-udc.c

+17 −0
Original line number Diff line number Diff line
@@ -1082,9 +1082,26 @@ static int fotg210_udc_stop(struct usb_gadget *g) 
	return 0;

}



/**

 * fotg210_vbus_session - Called by external transceiver to enable/disable udc

 * @_gadget: usb gadget

 * @is_active: 0 if should disable UDC VBUS, 1 if should enable

 *

 * Returns 0

 */

static int fotg210_vbus_session(struct usb_gadget *g, int is_active)

{

	struct fotg210_udc *fotg210 = gadget_to_fotg210(g);



	/* Call down to core integration layer to drive or disable VBUS */

	fotg210_vbus(fotg210->fotg, is_active);

	return 0;

}



static const struct usb_gadget_ops fotg210_gadget_ops = {

	.udc_start		= fotg210_udc_start,

	.udc_stop		= fotg210_udc_stop,

	.vbus_session		= fotg210_vbus_session,

};



/**

drivers/usb/fotg210/fotg210.h

+2 −0
Original line number Diff line number Diff line
@@ -17,6 +17,8 @@ struct fotg210 { 
	enum gemini_port port;

};



void fotg210_vbus(struct fotg210 *fotg, bool enable);



#ifdef CONFIG_USB_FOTG210_HCD

int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg);

int fotg210_hcd_remove(struct platform_device *pdev);