From patchwork Wed Dec 29 23:14:26 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 529030 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98F4EC433FE for ; Wed, 29 Dec 2021 23:15:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233027AbhL2XPF (ORCPT ); Wed, 29 Dec 2021 18:15:05 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:24696 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233003AbhL2XPE (ORCPT ); Wed, 29 Dec 2021 18:15:04 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1640819704; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XIhdvhVtCshP9lG99pn9JFFX/4evBCpxB0Ih0vEO5mU=; b=dhrjUZNv3xzMJ93DdAJQykmy5Y/zSOzo9l+jHzUwWR4i2fjFlmqRnrlfWAzvK8ZDG8TG1J qxCoW6yBcZKDdksdf/GRhpRElpMlfRbqVspyhK2o00vNYx6gdgTcSdK9H4W8MD4FIrv3IO KaszFXh+Fbq0BY7/V3oy9X/lwt5ERto= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-397-4-fL-lQzNDuj1uj9hr5zzA-1; Wed, 29 Dec 2021 18:14:58 -0500 X-MC-Unique: 4-fL-lQzNDuj1uj9hr5zzA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A00D01006AA0; Wed, 29 Dec 2021 23:14:56 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.192.20]) by smtp.corp.redhat.com (Postfix) with ESMTP id C82271037F5B; Wed, 29 Dec 2021 23:14:53 +0000 (UTC) From: Hans de Goede To: "Rafael J . Wysocki" , Mark Gross , Andy Shevchenko , Wolfram Sang , Mika Westerberg , Rob Herring , Greg Kroah-Hartman , Jiri Slaby Cc: Hans de Goede , Len Brown , linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-i2c@vger.kernel.org, Stephan Gerhold , linux-serial@vger.kernel.org Subject: [PATCH 07/12] platform/x86: x86-android-tablets: Add support for instantiating serdevs Date: Thu, 30 Dec 2021 00:14:26 +0100 Message-Id: <20211229231431.437982-8-hdegoede@redhat.com> In-Reply-To: <20211229231431.437982-1-hdegoede@redhat.com> References: <20211229231431.437982-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Add support for instantiating serdevs, this is necessary on some boards where the serdev info in the DSDT has issues. Signed-off-by: Hans de Goede --- drivers/platform/x86/Kconfig | 2 +- drivers/platform/x86/x86-android-tablets.c | 101 +++++++++++++++++++++ 2 files changed, 102 insertions(+), 1 deletion(-) diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 56efe336a690..8e55529f285c 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -1027,7 +1027,7 @@ config TOUCHSCREEN_DMI config X86_ANDROID_TABLETS tristate "X86 Android tablet support" - depends on I2C && ACPI && GPIOLIB + depends on I2C && SERIAL_DEV_BUS && ACPI && GPIOLIB help X86 tablets which ship with Android as (part of) the factory image typically have various problems with their DSDTs. The factory kernels diff --git a/drivers/platform/x86/x86-android-tablets.c b/drivers/platform/x86/x86-android-tablets.c index 4bcad05d4039..5267e57c4fea 100644 --- a/drivers/platform/x86/x86-android-tablets.c +++ b/drivers/platform/x86/x86-android-tablets.c @@ -21,6 +21,7 @@ #include #include #include +#include #include /* For gpio_get_desc() which is EXPORT_SYMBOL_GPL() */ #include "../../gpio/gpiolib.h" @@ -127,11 +128,26 @@ struct x86_i2c_client_info { struct x86_acpi_irq_data irq_data; }; +struct x86_serdev_info { + const char *ctrl_hid; + const char *ctrl_uid; + const char *ctrl_devname; + /* + * ATM the serdev core only supports of or ACPI matching; and sofar all + * Android x86 tablets DSDTs have usable serdev nodes, but sometimes + * under the wrong controller. So we just tie the existing serdev ACPI + * node to the right controller. + */ + const char *serdev_hid; +}; + struct x86_dev_info { const struct x86_i2c_client_info *i2c_client_info; const struct platform_device_info *pdev_info; + const struct x86_serdev_info *serdev_info; int i2c_client_count; int pdev_count; + int serdev_count; }; /* @@ -273,8 +289,10 @@ MODULE_DEVICE_TABLE(dmi, x86_android_tablet_ids); static int i2c_client_count; static int pdev_count; +static int serdev_count; static struct i2c_client **i2c_clients; static struct platform_device **pdevs; +static struct serdev_device **serdevs; static __init int x86_instantiate_i2c_client(const struct x86_dev_info *dev_info, int idx) @@ -310,10 +328,78 @@ static __init int x86_instantiate_i2c_client(const struct x86_dev_info *dev_info return 0; } +static __init int x86_instantiate_serdev(const struct x86_serdev_info *info, int idx) +{ + struct acpi_device *ctrl_adev, *serdev_adev; + struct serdev_device *serdev; + struct device *ctrl_dev; + int ret = -ENODEV; + + ctrl_adev = acpi_dev_get_first_match_dev(info->ctrl_hid, info->ctrl_uid, -1); + if (!ctrl_adev) { + pr_err("error could not get %s/%s ctrl adev\n", + info->ctrl_hid, info->ctrl_uid); + return -ENODEV; + } + + serdev_adev = acpi_dev_get_first_match_dev(info->serdev_hid, NULL, -1); + if (!serdev_adev) { + pr_err("error could not get %s serdev adev\n", info->serdev_hid); + goto put_ctrl_adev; + } + + /* get_first_physical_node() returns a weak ref, no need to put() it */ + ctrl_dev = acpi_get_first_physical_node(ctrl_adev); + if (!ctrl_dev) { + pr_err("error could not get %s/%s ctrl physical dev\n", + info->ctrl_hid, info->ctrl_uid); + goto put_serdev_adev; + } + + /* ctrl_dev now points to the controller's parent, get the controller */ + ctrl_dev = device_find_child_by_name(ctrl_dev, info->ctrl_devname); + if (!ctrl_dev) { + pr_err("error could not get %s/%s %s ctrl dev\n", + info->ctrl_hid, info->ctrl_uid, info->ctrl_devname); + goto put_serdev_adev; + } + + serdev = serdev_device_alloc(to_serdev_controller(ctrl_dev)); + if (!serdev) { + ret = -ENOMEM; + goto put_serdev_adev; + } + + ACPI_COMPANION_SET(&serdev->dev, serdev_adev); + acpi_device_set_enumerated(serdev_adev); + + ret = serdev_device_add(serdev); + if (ret) { + dev_err(&serdev->dev, "error %d adding serdev\n", ret); + serdev_device_put(serdev); + goto put_serdev_adev; + } + + serdevs[idx] = serdev; + +put_serdev_adev: + acpi_dev_put(serdev_adev); +put_ctrl_adev: + acpi_dev_put(ctrl_adev); + return ret; +} + static void x86_android_tablet_cleanup(void) { int i; + for (i = 0; i < serdev_count; i++) { + if (serdevs[i]) + serdev_device_remove(serdevs[i]); + } + + kfree(serdevs); + for (i = 0; i < pdev_count; i++) platform_device_unregister(pdevs[i]); @@ -365,6 +451,21 @@ static __init int x86_android_tablet_init(void) } } + serdevs = kcalloc(dev_info->serdev_count, sizeof(*serdevs), GFP_KERNEL); + if (!serdevs) { + x86_android_tablet_cleanup(); + return -ENOMEM; + } + + serdev_count = dev_info->serdev_count; + for (i = 0; i < serdev_count; i++) { + ret = x86_instantiate_serdev(&dev_info->serdev_info[i], i); + if (ret < 0) { + x86_android_tablet_cleanup(); + return ret; + } + } + return 0; }