Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752745AbdIAVtX (ORCPT ); Fri, 1 Sep 2017 17:49:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49932 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752704AbdIAVtU (ORCPT ); Fri, 1 Sep 2017 17:49:20 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 83AC7C04D28B Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=hdegoede@redhat.com From: Hans de Goede To: MyungJoo Ham , Chanwoo Choi , Guenter Roeck , Heikki Krogerus , Darren Hart , Andy Shevchenko , Peter Rosin , Mathias Nyman Cc: Hans de Goede , platform-driver-x86@vger.kernel.org, devel@driverdev.osuosl.org, Kuppuswamy Sathyanarayanan , Sathyanarayanan Kuppuswamy Natarajan , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , linux-usb@vger.kernel.org Subject: [PATCH 07/11] extcon: intel-int3496: Add support for controlling the USB-role mux Date: Fri, 1 Sep 2017 23:48:41 +0200 Message-Id: <20170901214845.7153-8-hdegoede@redhat.com> In-Reply-To: <20170901214845.7153-1-hdegoede@redhat.com> References: <20170901214845.7153-1-hdegoede@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 01 Sep 2017 21:49:20 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4274 Lines: 133 Cherry Trail SoCs have a built-in USB-role mux for switching between the host and device controllers, rather then using an external mux controller by a GPIO. There is a driver using the mux-subsys to control this mux, this commit adds support to the intel-int3496 driver to get a mux_controller handle for the mux and set the mux through the mux-subsys rather then through a GPIO. Signed-off-by: Hans de Goede --- drivers/extcon/Kconfig | 1 + drivers/extcon/extcon-intel-int3496.c | 59 ++++++++++++++++++++++++++++++++++- 2 files changed, 59 insertions(+), 1 deletion(-) diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index a7bca4207f44..7ab6acc9708a 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -45,6 +45,7 @@ config EXTCON_GPIO config EXTCON_INTEL_INT3496 tristate "Intel INT3496 ACPI device extcon driver" depends on GPIOLIB && ACPI && (X86 || COMPILE_TEST) + select MULTIPLEXER help Say Y here to enable extcon support for USB OTG ports controlled by an Intel INT3496 ACPI device. diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c index 1a45e745717d..cea9c9b1521c 100644 --- a/drivers/extcon/extcon-intel-int3496.c +++ b/drivers/extcon/extcon-intel-int3496.c @@ -23,8 +23,12 @@ #include #include #include +#include #include +#include +#include + #define INT3496_GPIO_USB_ID 0 #define INT3496_GPIO_VBUS_EN 1 #define INT3496_GPIO_USB_MUX 2 @@ -37,6 +41,8 @@ struct int3496_data { struct gpio_desc *gpio_usb_id; struct gpio_desc *gpio_vbus_en; struct gpio_desc *gpio_usb_mux; + struct mux_control *usb_mux; + bool usb_mux_set; int usb_id_irq; }; @@ -56,11 +62,31 @@ static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = { { }, }; +static struct mux_lookup acpi_int3496_cht_mux_lookup[] = { + { + .provider = "intel_cht_usb_mux", + .dev_id = "INT3496:00", + .mux_name = "usb-role-mux", + }, +}; + +#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } + +static const struct x86_cpu_id cht_cpu_ids[] = { + ICPU(INTEL_FAM6_ATOM_AIRMONT), /* Braswell, Cherry Trail */ + {} +}; + +static bool int3496_soc_has_mux(void) +{ + return x86_match_cpu(cht_cpu_ids); +} + static void int3496_do_usb_id(struct work_struct *work) { struct int3496_data *data = container_of(work, struct int3496_data, work.work); - int id = gpiod_get_value_cansleep(data->gpio_usb_id); + int ret, id = gpiod_get_value_cansleep(data->gpio_usb_id); /* id == 1: PERIPHERAL, id == 0: HOST */ dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST"); @@ -72,6 +98,22 @@ static void int3496_do_usb_id(struct work_struct *work) if (!IS_ERR(data->gpio_usb_mux)) gpiod_direction_output(data->gpio_usb_mux, id); + if (data->usb_mux) { + /* + * The mux framework expects multiple competing users, we must + * release our previous setting before applying the new one. + */ + if (data->usb_mux_set) + mux_control_deselect(data->usb_mux); + + ret = mux_control_select(data->usb_mux, + id ? MUX_USB_DEVICE : MUX_USB_HOST); + if (ret) + dev_err(data->dev, "Error setting mux: %d\n", ret); + + data->usb_mux_set = ret == 0; + } + if (!IS_ERR(data->gpio_vbus_en)) gpiod_direction_output(data->gpio_vbus_en, !id); @@ -107,6 +149,21 @@ static int int3496_probe(struct platform_device *pdev) data->dev = dev; INIT_DELAYED_WORK(&data->work, int3496_do_usb_id); + if (int3496_soc_has_mux()) { + mux_add_table(acpi_int3496_cht_mux_lookup, + ARRAY_SIZE(acpi_int3496_cht_mux_lookup)); + data->usb_mux = devm_mux_control_get(dev, "usb-role-mux"); + /* Doing this here keeps our error handling clean. */ + mux_remove_table(acpi_int3496_cht_mux_lookup, + ARRAY_SIZE(acpi_int3496_cht_mux_lookup)); + if (IS_ERR(data->usb_mux)) { + ret = PTR_ERR(data->usb_mux); + if (ret != -EPROBE_DEFER) + dev_err(dev, "can't get mux: %d\n", ret); + return ret; + } + } + data->gpio_usb_id = devm_gpiod_get(dev, "id", GPIOD_IN); if (IS_ERR(data->gpio_usb_id)) { ret = PTR_ERR(data->gpio_usb_id); -- 2.13.5