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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: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-7-100388af9810@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Walleij 2023-01-18 08:09:21 +01:00 committed by Greg Kroah-Hartman
parent 816f518df2
commit 3e679bde52
3 changed files with 48 additions and 0 deletions
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29
drivers/usb/fotg210/fotg210-core.c
View File

@ -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;

17
drivers/usb/fotg210/fotg210-udc.c
View File

@ -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,
};
/**

2
drivers/usb/fotg210/fotg210.h
View File

@ -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);