From b7fa2cd357eded72159a6112e23839c47f4b50c1 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Tue, 1 Feb 2022 14:07:03 +0100 Subject: [PATCH] extcon: intel-cht-wc: Support devs with Micro-B / USB-2 only Type-C connectors So far the extcon-intel-cht-wc code has only been tested on devices with a Type-C connector with USB-PD, USB3 (superspeed) and DP-altmode support through a FUSB302 Type-C controller. Some devices with the intel-cht-wc PMIC however come with an USB-micro-B connector, or an USB-2 only Type-C connector without USB-PD. Which device-model we are running on can be identified with the new cht_wc_model intel_soc_pmic field. On models without a Type-C controller the extcon code must control the Vbus 5V boost converter and the USB role switch depending on the detected cable-type. Acked-by: Chanwoo Choi Signed-off-by: Hans de Goede Signed-off-by: Sebastian Reichel --- drivers/extcon/Kconfig | 2 + drivers/extcon/extcon-intel-cht-wc.c | 91 ++++++++++++++++++++++++++++ 2 files changed, 93 insertions(+) diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index aab87c9b35c8..0d42e49105dd 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -61,6 +61,8 @@ config EXTCON_INTEL_INT3496 config EXTCON_INTEL_CHT_WC tristate "Intel Cherrytrail Whiskey Cove PMIC extcon driver" depends on INTEL_SOC_PMIC_CHTWC + depends on USB_SUPPORT + select USB_ROLE_SWITCH help Say Y here to enable extcon support for charger detection / control on the Intel Cherrytrail Whiskey Cove PMIC. diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c index 81cae8c75850..3fc5dd06849a 100644 --- a/drivers/extcon/extcon-intel-cht-wc.c +++ b/drivers/extcon/extcon-intel-cht-wc.c @@ -16,7 +16,9 @@ #include #include #include +#include #include +#include #include "extcon-intel.h" @@ -102,8 +104,11 @@ struct cht_wc_extcon_data { struct device *dev; struct regmap *regmap; struct extcon_dev *edev; + struct usb_role_switch *role_sw; + struct regulator *vbus_boost; unsigned int previous_cable; bool usb_host; + bool vbus_boost_enabled; }; static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts) @@ -217,6 +222,18 @@ static void cht_wc_extcon_set_otgmode(struct cht_wc_extcon_data *ext, CHT_WC_CHGRCTRL1_OTGMODE, val); if (ret) dev_err(ext->dev, "Error updating CHGRCTRL1 reg: %d\n", ret); + + if (ext->vbus_boost && ext->vbus_boost_enabled != enable) { + if (enable) + ret = regulator_enable(ext->vbus_boost); + else + ret = regulator_disable(ext->vbus_boost); + + if (ret) + dev_err(ext->dev, "Error updating Vbus boost regulator: %d\n", ret); + else + ext->vbus_boost_enabled = enable; + } } static void cht_wc_extcon_enable_charging(struct cht_wc_extcon_data *ext, @@ -246,6 +263,7 @@ static void cht_wc_extcon_pwrsrc_event(struct cht_wc_extcon_data *ext) unsigned int cable = EXTCON_NONE; /* Ignore errors in host mode, as the 5v boost converter is on then */ bool ignore_get_charger_errors = ext->usb_host; + enum usb_role role; ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts); if (ret) { @@ -289,6 +307,18 @@ set_state: ext->usb_host = ((id == INTEL_USB_ID_GND) || (id == INTEL_USB_RID_A)); extcon_set_state_sync(ext->edev, EXTCON_USB_HOST, ext->usb_host); + + if (ext->usb_host) + role = USB_ROLE_HOST; + else if (pwrsrc_sts & CHT_WC_PWRSRC_VBUS) + role = USB_ROLE_DEVICE; + else + role = USB_ROLE_NONE; + + /* Note: this is a no-op when ext->role_sw is NULL */ + ret = usb_role_switch_set_role(ext->role_sw, role); + if (ret) + dev_err(ext->dev, "Error setting USB-role: %d\n", ret); } static irqreturn_t cht_wc_extcon_isr(int irq, void *data) @@ -334,6 +364,61 @@ static int cht_wc_extcon_sw_control(struct cht_wc_extcon_data *ext, bool enable) return ret; } +static int cht_wc_extcon_find_role_sw(struct cht_wc_extcon_data *ext) +{ + const struct software_node *swnode; + struct fwnode_handle *fwnode; + + swnode = software_node_find_by_name(NULL, "intel-xhci-usb-sw"); + if (!swnode) + return -EPROBE_DEFER; + + fwnode = software_node_fwnode(swnode); + ext->role_sw = usb_role_switch_find_by_fwnode(fwnode); + fwnode_handle_put(fwnode); + + return ext->role_sw ? 0 : -EPROBE_DEFER; +} + +static void cht_wc_extcon_put_role_sw(void *data) +{ + struct cht_wc_extcon_data *ext = data; + + usb_role_switch_put(ext->role_sw); +} + +/* Some boards require controlling the role-sw and Vbus based on the id-pin */ +static int cht_wc_extcon_get_role_sw_and_regulator(struct cht_wc_extcon_data *ext) +{ + int ret; + + ret = cht_wc_extcon_find_role_sw(ext); + if (ret) + return ret; + + ret = devm_add_action_or_reset(ext->dev, cht_wc_extcon_put_role_sw, ext); + if (ret) + return ret; + + /* + * On x86/ACPI platforms the regulator <-> consumer link is provided + * by platform_data passed to the regulator driver. This means that + * this info is not available before the regulator driver has bound. + * Use devm_regulator_get_optional() to avoid getting a dummy + * regulator and wait for the regulator to show up if necessary. + */ + ext->vbus_boost = devm_regulator_get_optional(ext->dev, "vbus"); + if (IS_ERR(ext->vbus_boost)) { + ret = PTR_ERR(ext->vbus_boost); + if (ret == -ENODEV) + ret = -EPROBE_DEFER; + + return dev_err_probe(ext->dev, ret, "getting Vbus regulator"); + } + + return 0; +} + static int cht_wc_extcon_probe(struct platform_device *pdev) { struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent); @@ -376,6 +461,12 @@ static int cht_wc_extcon_probe(struct platform_device *pdev) */ cht_wc_extcon_set_5v_boost(ext, false); break; + case INTEL_CHT_WC_LENOVO_YOGABOOK1: + case INTEL_CHT_WC_XIAOMI_MIPAD2: + ret = cht_wc_extcon_get_role_sw_and_regulator(ext); + if (ret) + return ret; + break; default: break; }