diff options
| author | Linus Walleij <linus.walleij@linaro.org> | 2023-01-18 08:09:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 14:10:44 +0100 |
| commit | 3e679bde529e892a59e89d3a0728cc153e8ecefe (patch) | |
| tree | dada0059f4d26f303a7c48e45e8fed643f7e915d /drivers/usb/fotg210 | |
| parent | usb: fotg210-udc: Assign of_node and speed on start (diff) | |
| download | linux-3e679bde529e892a59e89d3a0728cc153e8ecefe.tar.xz linux-3e679bde529e892a59e89d3a0728cc153e8ecefe.zip | |
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>
Diffstat (limited to 'drivers/usb/fotg210')
| -rw-r--r-- | drivers/usb/fotg210/fotg210-core.c | 29 | ||||
| -rw-r--r-- | drivers/usb/fotg210/fotg210-udc.c | 17 | ||||
| -rw-r--r-- | drivers/usb/fotg210/fotg210.h | 2 |
3 files changed, 48 insertions, 0 deletions
diff --git a/drivers/usb/fotg210/fotg210-core.c b/drivers/usb/fotg210/fotg210-core.c index b69167bb4b99..c06f8eb3acbd 100644 --- a/drivers/usb/fotg210/fotg210-core.c +++ b/drivers/usb/fotg210/fotg210-core.c @@ -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; diff --git a/drivers/usb/fotg210/fotg210-udc.c b/drivers/usb/fotg210/fotg210-udc.c index 7740df670b75..4334504fccc8 100644 --- a/drivers/usb/fotg210/fotg210-udc.c +++ b/drivers/usb/fotg210/fotg210-udc.c @@ -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, }; /** diff --git a/drivers/usb/fotg210/fotg210.h b/drivers/usb/fotg210/fotg210.h index 4d0d4ae1a957..c44c0afe2956 100644 --- a/drivers/usb/fotg210/fotg210.h +++ b/drivers/usb/fotg210/fotg210.h @@ -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); |