From patchwork Fri Jan 15 20:24:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philip Chen X-Patchwork-Id: 12024087 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F73CC433E0 for ; Fri, 15 Jan 2021 20:25:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3F3923A5A for ; Fri, 15 Jan 2021 20:25:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388562AbhAOUZf (ORCPT ); Fri, 15 Jan 2021 15:25:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56532 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728305AbhAOUZa (ORCPT ); Fri, 15 Jan 2021 15:25:30 -0500 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 94C61C061796 for ; Fri, 15 Jan 2021 12:24:37 -0800 (PST) Received: by mail-pl1-x62d.google.com with SMTP id x12so5271901plr.10 for ; Fri, 15 Jan 2021 12:24:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=RuvNG3Y2Awop2hlIDKM2ab4Y8l5qk2cyBeW+m/Dh9JQ=; b=aWOG/5DKxg8t2vV7OCW4p0LpPCbfrXdri1TEcEpwsgmjHON647ZhlXtjFQB0NF2CwM xT8iytQZEpESwKKpSpaQL1I2LwvWgXqw5otGCKHkubUiWAvfvgco1PQPs6x7seAilXXp VQUWLixnUbGc5ZUDuwJFU1rDA9y9vQuO3ctmM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=RuvNG3Y2Awop2hlIDKM2ab4Y8l5qk2cyBeW+m/Dh9JQ=; b=CkSzKr7QYAHrZDWpUk2Ep4GK+AKopR64yXiBX7vr21yCo1B5VrqKZQyVB7K489ZbCJ u0IPKW9gYEAOrLVuXPUho6dmccb55EwMQpC04U4gC7Tzea0oa0jfBRJQraZeeX7iaHXT 0hauW6P7fHwjy08IyYjyxujdCPJmpwoJ8o0g4sm/pDE4e0cTqGbWOd0G7bLiTGDXbO2Q pPTXSGWOHDS/mqBp8toysm6mNPlrwWejMrsF8pMRQtRoiqFIIBfMvNwk1b7ycUrUUFiR jj3DVo6uIVhvuIIUPf8Ja7BBZ5kK1o9f3D+qpv40ofv24bRpF7/fTE9E6kE858ul6IVZ 5TDA== X-Gm-Message-State: AOAM5304wUExGDpNGzovIHpWRlUWsuZa8dPLuBGbUpB31c01mFAmHCn2 qQPylsBZsA0hi5jJjpT7NWf2UA== X-Google-Smtp-Source: ABdhPJwCLfHVQ9l143k1qN/+1RKdXqlIVwab+w/DuyL7RD1xD6NehbbxbEuZ1OrohKbyyTL5lRHxkA== X-Received: by 2002:a17:90a:73c5:: with SMTP id n5mr12291974pjk.118.1610742277180; Fri, 15 Jan 2021 12:24:37 -0800 (PST) Received: from philipchen.mtv.corp.google.com ([2620:15c:202:201:a6ae:11ff:fe11:fd59]) by smtp.gmail.com with ESMTPSA id x19sm401097pfp.207.2021.01.15.12.24.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Jan 2021 12:24:36 -0800 (PST) From: Philip Chen To: LKML , dmitry.torokhov@gmail.com Cc: swboyd@chromium.org, dianders@chromium.org, Philip Chen , Benson Leung , Enric Balletbo i Serra , Guenter Roeck , Lee Jones , Rajat Jain , linux-input@vger.kernel.org Subject: [PATCH v7 2/2] Input: cros-ec-keyb - Expose function row physical map to userspace Date: Fri, 15 Jan 2021 12:24:30 -0800 Message-Id: <20210115122412.v7.2.I6542d7d9d0b246e7079bb16b41e697b2ac4b4e39@changeid> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210115122412.v7.1.I025fb861cd5fa0ef5286b7dce514728e9df7ae74@changeid> References: <20210115122412.v7.1.I025fb861cd5fa0ef5286b7dce514728e9df7ae74@changeid> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org The top-row keys in a keyboard usually have dual functionalities. E.g. A function key "F1" is also an action key "Browser back". Therefore, when an application receives an action key code from a top-row key press, the application needs to know how to correlate the action key code with the function key code and do the conversion whenever necessary. Since the userpace already knows the key scanlines (row/column) associated with a received key code. Essentially, the userspace only needs a mapping between the key row/column and the matching physical location in the top row. So, enhance the cros-ec-keyb driver to create such a mapping and expose it to userspace in the form of a function_row_physmap attribute. The attribute would be a space separated ordered list of row/column codes for the keys in the function row, in a left-to-right order. The attribute will only be present when the device has a custom design for the top-row keys. Signed-off-by: Philip Chen Reviewed-by: Stephen Boyd --- (no changes since v6) Changes in v6: - add to Documentation/ABI - update cros_ec_keyb_register_matrix() to improve readability Changes in v5: - change the data type for a few local variables - update function_row_physmap_show() and cros_ec_keyb_register_matrix() to improve readability/efficiency Changes in v4: - replace sysfs_create_group() with devm_device_add_group() - remove an unused member in struct cros_ec_keyb Changes in v3: - parse `function-row-physmap` from DT earlier, when we probe cros_ec_keyb, and then store the extracted info in struct cros_ec_keyb. Changes in v2: - create function-row-physmap file in sysfs by parsing `function-row-physmap` property from DT - assume the device already has a correct keymap to reflect the custom top-row keys (if they exist) .../testing/sysfs-driver-input-cros-ec-keyb | 6 ++ drivers/input/keyboard/cros_ec_keyb.c | 79 +++++++++++++++++++ 2 files changed, 85 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb diff --git a/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb b/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb new file mode 100644 index 0000000000000..c7afc2328045c --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-input-cros-ec-keyb @@ -0,0 +1,6 @@ +What: /sys/class/input/input(x)/device/function_row_physmap +Date: January 2021 +Contact: Philip Chen +Description: A space separated list of scancodes for the top row keys, + ordered by the physical positions of the keys, from left + to right. diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c index b379ed7628781..38457d9641bdf 100644 --- a/drivers/input/keyboard/cros_ec_keyb.c +++ b/drivers/input/keyboard/cros_ec_keyb.c @@ -27,6 +27,8 @@ #include +#define MAX_NUM_TOP_ROW_KEYS 15 + /** * struct cros_ec_keyb - Structure representing EC keyboard device * @@ -42,6 +44,9 @@ * @idev: The input device for the matrix keys. * @bs_idev: The input device for non-matrix buttons and switches (or NULL). * @notifier: interrupt event notifier for transport devices + * @function_row_physmap: An array of the encoded rows/columns for the top + * row function keys, in an order from left to right + * @num_function_row_keys: The number of top row keys in a custom keyboard */ struct cros_ec_keyb { unsigned int rows; @@ -58,6 +63,9 @@ struct cros_ec_keyb { struct input_dev *idev; struct input_dev *bs_idev; struct notifier_block notifier; + + u16 function_row_physmap[MAX_NUM_TOP_ROW_KEYS]; + size_t num_function_row_keys; }; /** @@ -527,6 +535,11 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev) struct input_dev *idev; const char *phys; int err; + struct property *prop; + const __be32 *p; + u16 *physmap; + u32 key_pos; + int row, col; err = matrix_keypad_parse_properties(dev, &ckdev->rows, &ckdev->cols); if (err) @@ -578,6 +591,21 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev) ckdev->idev = idev; cros_ec_keyb_compute_valid_keys(ckdev); + physmap = ckdev->function_row_physmap; + of_property_for_each_u32(dev->of_node, "function-row-physmap", + prop, p, key_pos) { + if (ckdev->num_function_row_keys == MAX_NUM_TOP_ROW_KEYS) { + dev_warn(dev, "Only support up to %d top row keys\n", + MAX_NUM_TOP_ROW_KEYS); + break; + } + row = KEY_ROW(key_pos); + col = KEY_COL(key_pos); + *physmap = MATRIX_SCAN_CODE(row, col, ckdev->row_shift); + physmap++; + ckdev->num_function_row_keys++; + } + err = input_register_device(ckdev->idev); if (err) { dev_err(dev, "cannot register input device\n"); @@ -587,6 +615,51 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev) return 0; } +static ssize_t function_row_physmap_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + ssize_t size = 0; + int i; + struct cros_ec_keyb *ckdev = dev_get_drvdata(dev); + u16 *physmap = ckdev->function_row_physmap; + + for (i = 0; i < ckdev->num_function_row_keys; i++) + size += scnprintf(buf + size, PAGE_SIZE - size, + "%s%02X", size ? " " : "", physmap[i]); + if (size) + size += scnprintf(buf + size, PAGE_SIZE - size, "\n"); + + return size; +} + +static DEVICE_ATTR_RO(function_row_physmap); + +static struct attribute *cros_ec_keyb_attrs[] = { + &dev_attr_function_row_physmap.attr, + NULL, +}; + +static umode_t cros_ec_keyb_attr_is_visible(struct kobject *kobj, + struct attribute *attr, + int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct cros_ec_keyb *ckdev = dev_get_drvdata(dev); + + if (attr == &dev_attr_function_row_physmap.attr && + !ckdev->num_function_row_keys) + return 0; + + return attr->mode; +} + +static const struct attribute_group cros_ec_keyb_attr_group = { + .is_visible = cros_ec_keyb_attr_is_visible, + .attrs = cros_ec_keyb_attrs, +}; + + static int cros_ec_keyb_probe(struct platform_device *pdev) { struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent); @@ -617,6 +690,12 @@ static int cros_ec_keyb_probe(struct platform_device *pdev) return err; } + err = devm_device_add_group(dev, &cros_ec_keyb_attr_group); + if (err) { + dev_err(dev, "failed to create attributes. err=%d\n", err); + return err; + } + ckdev->notifier.notifier_call = cros_ec_keyb_work; err = blocking_notifier_chain_register(&ckdev->ec->event_notifier, &ckdev->notifier);