From patchwork Tue Dec 31 16:20:49 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 3421951 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 21671C02DD for ; Tue, 31 Dec 2013 16:22:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 16578200F2 for ; Tue, 31 Dec 2013 16:22:20 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 90AAD2011E for ; Tue, 31 Dec 2013 16:22:18 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vy24m-0003uh-QA; Tue, 31 Dec 2013 16:21:53 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vy24d-0002r0-9S; Tue, 31 Dec 2013 16:21:43 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vy24K-0002oP-5b for linux-arm-kernel@lists.infradead.org; Tue, 31 Dec 2013 16:21:26 +0000 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id rBVGL4qe026554 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 31 Dec 2013 11:21:04 -0500 Received: from shalem.localdomain.com (vpn1-4-132.ams2.redhat.com [10.36.4.132]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id rBVGKutN000381; Tue, 31 Dec 2013 11:21:02 -0500 From: Hans de Goede To: Dmitry Torokhov Subject: [PATCH v3 2/5] input: sun4i-ts: Add support for temperature sensor Date: Tue, 31 Dec 2013 17:20:49 +0100 Message-Id: <1388506852-3548-3-git-send-email-hdegoede@redhat.com> In-Reply-To: <1388506852-3548-1-git-send-email-hdegoede@redhat.com> References: <1388506852-3548-1-git-send-email-hdegoede@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131231_112124_411066_8FE0FE5F X-CRM114-Status: GOOD ( 26.60 ) X-Spam-Score: -7.0 (-------) Cc: LM Sensors , Hans de Goede , linux-sunxi@googlegroups.com, Corentin LABBE , linux-input@vger.kernel.org, Maxime Ripard , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The sun4i resisitive touchscreen controller also comes with a built-in temperature sensor. This commit adds support for it. This commit also introduces a new "ts-attached" device-tree property, when this is not set, the input part of the driver won't register. This way the internal temperature sensor can be used to measure the SoC temperature independent of there actually being a touchscreen attached to the controller. Signed-off-by: Hans de Goede Reviewed-by: Guenter Roeck --- .../bindings/input/touchscreen/sun4i.txt | 5 + drivers/input/touchscreen/sun4i-ts.c | 140 ++++++++++++++++----- 2 files changed, 114 insertions(+), 31 deletions(-) diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt index e45927e..6bac67b 100644 --- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt +++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt @@ -6,10 +6,15 @@ Required properties: - reg: mmio address range of the chip - interrupts: interrupt to which the chip is connected +Optional properties: + - allwinner,ts-attached: boolean indicating that an actual touchscreen is + attached to the controller + Example: rtp: rtp@01c25000 { compatible = "allwinner,sun4i-ts"; reg = <0x01c25000 0x100>; interrupts = <29>; + allwinner,ts-attached; }; diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c index 5945219..16cbb01 100644 --- a/drivers/input/touchscreen/sun4i-ts.c +++ b/drivers/input/touchscreen/sun4i-ts.c @@ -3,6 +3,9 @@ * * Copyright (C) 2013 - 2014 Hans de Goede * + * The hwmon parts are based on work by Corentin LABBE which is: + * Copyright (C) 2013 Corentin LABBE + * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or @@ -30,6 +33,7 @@ */ #include +#include #include #include #include @@ -106,14 +110,12 @@ struct sun4i_ts_data { void __iomem *base; unsigned int irq; bool ignore_fifo_data; + int temp_data; }; -static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) +static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val) { - struct sun4i_ts_data *ts = dev_id; - u32 reg_val, x, y; - - reg_val = readl(ts->base + TP_INT_FIFOS); + u32 x, y; if (reg_val & FIFO_DATA_PENDING) { x = readl(ts->base + TP_DATA); @@ -139,6 +141,20 @@ static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) input_report_key(ts->input, BTN_TOUCH, 0); input_sync(ts->input); } +} + +static irqreturn_t sun4i_ts_irq(int irq, void *dev_id) +{ + struct sun4i_ts_data *ts = dev_id; + u32 reg_val; + + reg_val = readl(ts->base + TP_INT_FIFOS); + + if (reg_val & TEMP_DATA_PENDING) + ts->temp_data = readl(ts->base + TEMP_DATA); + + if (ts->input) + sun4i_ts_irq_handle_input(ts, reg_val); writel(reg_val, ts->base + TP_INT_FIFOS); @@ -149,9 +165,9 @@ static int sun4i_ts_open(struct input_dev *dev) { struct sun4i_ts_data *ts = input_get_drvdata(dev); - /* Flush, set trig level to 1, enable data and up irqs */ - writel(DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | TP_UP_IRQ_EN(1), - ts->base + TP_INT_FIFOC); + /* Flush, set trig level to 1, enable temp, data and up irqs */ + writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | + TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC); return 0; } @@ -160,15 +176,48 @@ static void sun4i_ts_close(struct input_dev *dev) { struct sun4i_ts_data *ts = input_get_drvdata(dev); - /* Deactivate all IRQs */ - writel(0, ts->base + TP_INT_FIFOC); + /* Deactivate all input IRQs */ + writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); +} + +static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, + char *buf) +{ + struct sun4i_ts_data *ts = dev_get_drvdata(dev); + + /* No temp_data until the first irq */ + if (ts->temp_data == -1) + return -EAGAIN; + + return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100); +} + +static ssize_t show_temp_label(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + return sprintf(buf, "SoC temperature\n"); } +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); +static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL); + +static struct attribute *sun4i_ts_attrs[] = { + &dev_attr_temp1_input.attr, + &dev_attr_temp1_label.attr, + NULL +}; +ATTRIBUTE_GROUPS(sun4i_ts); + static int sun4i_ts_probe(struct platform_device *pdev) { struct sun4i_ts_data *ts; struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct device *hwmon; int ret; + bool ts_attached; + + ts_attached = of_property_read_bool(np, "allwinner,ts-attached"); ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL); if (!ts) @@ -176,24 +225,27 @@ static int sun4i_ts_probe(struct platform_device *pdev) ts->dev = dev; ts->ignore_fifo_data = true; - - ts->input = devm_input_allocate_device(dev); - if (!ts->input) - return -ENOMEM; - - ts->input->name = pdev->name; - ts->input->phys = "sun4i_ts/input0"; - ts->input->open = sun4i_ts_open; - ts->input->close = sun4i_ts_close; - ts->input->id.bustype = BUS_HOST; - ts->input->id.vendor = 0x0001; - ts->input->id.product = 0x0001; - ts->input->id.version = 0x0100; - ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS); - set_bit(BTN_TOUCH, ts->input->keybit); - input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0); - input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0); - input_set_drvdata(ts->input, ts); + ts->temp_data = -1; + + if (ts_attached) { + ts->input = devm_input_allocate_device(dev); + if (!ts->input) + return -ENOMEM; + + ts->input->name = pdev->name; + ts->input->phys = "sun4i_ts/input0"; + ts->input->open = sun4i_ts_open; + ts->input->close = sun4i_ts_close; + ts->input->id.bustype = BUS_HOST; + ts->input->id.vendor = 0x0001; + ts->input->id.product = 0x0001; + ts->input->id.version = 0x0100; + ts->input->evbit[0] = BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS); + set_bit(BTN_TOUCH, ts->input->keybit); + input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0); + input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0); + input_set_drvdata(ts->input, ts); + } ts->base = devm_ioremap_resource(dev, platform_get_resource(pdev, IORESOURCE_MEM, 0)); @@ -232,14 +284,39 @@ static int sun4i_ts_probe(struct platform_device *pdev) writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1), ts->base + TP_CTRL1); - ret = input_register_device(ts->input); - if (ret) - return ret; + hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts", + ts, sun4i_ts_groups); + if (IS_ERR(hwmon)) + return PTR_ERR(hwmon); + + writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); + + if (ts_attached) { + ret = input_register_device(ts->input); + if (ret) { + writel(0, ts->base + TP_INT_FIFOC); + return ret; + } + } platform_set_drvdata(pdev, ts); return 0; } +static int sun4i_ts_remove(struct platform_device *pdev) +{ + struct sun4i_ts_data *ts = platform_get_drvdata(pdev); + + /* Explicit unregister to avoid open/close changing the imask later */ + if (ts->input) + input_unregister_device(ts->input); + + /* Deactivate all IRQs */ + writel(0, ts->base + TP_INT_FIFOC); + + return 0; +} + static const struct of_device_id sun4i_ts_of_match[] = { { .compatible = "allwinner,sun4i-ts", }, { /* sentinel */ } @@ -253,6 +330,7 @@ static struct platform_driver sun4i_ts_driver = { .of_match_table = of_match_ptr(sun4i_ts_of_match), }, .probe = sun4i_ts_probe, + .remove = sun4i_ts_remove, }; module_platform_driver(sun4i_ts_driver);