From patchwork Fri Dec 4 19:52:57 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 64943 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nB4JrJBu003119 for ; Fri, 4 Dec 2009 19:53:19 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756926AbZLDTxL (ORCPT ); Fri, 4 Dec 2009 14:53:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756928AbZLDTxL (ORCPT ); Fri, 4 Dec 2009 14:53:11 -0500 Received: from metis.ext.pengutronix.de ([92.198.50.35]:36994 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754455AbZLDTxK (ORCPT ); Fri, 4 Dec 2009 14:53:10 -0500 Received: from octopus.hi.pengutronix.de ([2001:6f8:1178:2:215:17ff:fe12:23b0]) by metis.ext.pengutronix.de with esmtp (Exim 4.69) (envelope-from ) id 1NGeDL-0002dv-Sf; Fri, 04 Dec 2009 20:53:15 +0100 Received: from ukl by octopus.hi.pengutronix.de with local (Exim 4.69) (envelope-from ) id 1NGeDJ-0008NU-BR; Fri, 04 Dec 2009 20:53:13 +0100 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= To: linux-input@vger.kernel.org Cc: Sascha Hauer , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Dmitry Torokhov , Mark Brown Subject: [PATCH] [input] add mc13783 touchscreen driver Date: Fri, 4 Dec 2009 20:52:57 +0100 Message-Id: <1259956377-32173-1-git-send-email-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 1.6.5.2 In-Reply-To: <20090813162321.5A2F5526EC9@mailhub.coreip.homeip.net> References: <20090813162321.5A2F5526EC9@mailhub.coreip.homeip.net> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:6f8:1178:2:215:17ff:fe12:23b0 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-input@vger.kernel.org Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 8cc453c..cdee9ca 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -425,6 +425,18 @@ config TOUCHSCREEN_USB_COMPOSITE To compile this driver as a module, choose M here: the module will be called usbtouchscreen. +config TOUCHSCREEN_MC13783 + tristate "Freescale MC13783 touchscreen input driver" + depends on MFD_MC13783 + help + Say Y here if you have an Freescale MC13783 PMIC on your + board and want to use its touchscreen + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called mc13783_ts. + config TOUCHSCREEN_USB_EGALAX default y bool "eGalax, eTurboTouch CT-410/510/700 device support" if EMBEDDED diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 15fa62c..ac5ecaf 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_TOUCHSCREEN_MCS5000) += mcs5000_ts.o obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o +obj-$(CONFIG_TOUCHSCREEN_MC13783) += mc13783_ts.o obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o obj-$(CONFIG_TOUCHSCREEN_HP7XX) += jornada720_ts.o obj-$(CONFIG_TOUCHSCREEN_HTCPEN) += htcpen.o diff --git a/drivers/input/touchscreen/mc13783_ts.c b/drivers/input/touchscreen/mc13783_ts.c new file mode 100644 index 0000000..a36b2ad --- /dev/null +++ b/drivers/input/touchscreen/mc13783_ts.c @@ -0,0 +1,259 @@ +/* + * Driver for the Freescale Semiconductor MC13783 touchscreen. + * + * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright (C) 2009 Sascha Hauer, Pengutronix + * + * Initial development of this code was funded by + * Phytec Messtechnik GmbH, http://www.phytec.de/ + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include + +#define MC13783_TS_NAME "mc13783-ts" + +#define DEFAULT_SAMPLE_TOLERANCE 300 + +static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE; +module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(sample_tolerance, + "If the minimal and maximal value read out for one axis (out " + "of three) differ by this value (default: " + __stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading " + "is supposed to be wrong and is discarded. Set to 0 to " + "disable this check."); + +struct mc13783_ts_priv { + struct input_dev *idev; + struct mc13783 *mc13783; + struct delayed_work work; + struct workqueue_struct *workq; + unsigned int sample[4]; +}; + +static irqreturn_t mc13783_ts_handler(int irq, void *data) +{ + struct mc13783_ts_priv *priv = data; + + mc13783_ackirq(priv->mc13783, irq); + + queue_delayed_work(priv->workq, &priv->work, 0); + + return IRQ_HANDLED; +} + +#define sort3(a0, a1, a2) ({ \ + if (a0 > a1) \ + swap(a0, a1); \ + if (a1 > a2) \ + swap(a1, a2); \ + if (a0 > a1) \ + swap(a0, a1); \ + }) + +static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv) +{ + int x0, x1, x2, y0, y1, y2; + int cr0, cr1; + + /* + * the values are 10-bit wide only, but the two least significant + * bits are for future 12 bit use and reading yields 0 + */ + x0 = priv->sample[0] & 0xfff; + x1 = priv->sample[1] & 0xfff; + x2 = priv->sample[2] & 0xfff; + y0 = priv->sample[3] & 0xfff; + y1 = (priv->sample[0] >> 12) & 0xfff; + y2 = (priv->sample[1] >> 12) & 0xfff; + cr0 = (priv->sample[2] >> 12) & 0xfff; + cr1 = (priv->sample[3] >> 12) & 0xfff; + + dev_dbg(&priv->idev->dev, "x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) " + "cr: (% 4d, % 4d)\n", x0, x1, x2, y0, y1, y2, cr0, cr1); + + sort3(x0, x1, x2); + sort3(y0, y1, y2); + + cr0 = (cr0 + cr1) / 2; + + if (!cr0 || !sample_tolerance || + (x2 - x0 < sample_tolerance && + y2 - y0 < sample_tolerance)) + { + /* report the median coordinate and average pressure */ + if (cr0) { + input_report_abs(priv->idev, ABS_X, x1); + input_report_abs(priv->idev, ABS_Y, y1); + + dev_dbg(&priv->idev->dev, "report (%d, %d, %d)\n", + x1, y1, 0x1000 - cr0); + queue_delayed_work(priv->workq, &priv->work, HZ / 50); + } else + dev_dbg(&priv->idev->dev, "report release\n"); + + input_report_abs(priv->idev, ABS_PRESSURE, + cr0 ? 0x1000 - cr0 : cr0); + input_report_key(priv->idev, BTN_TOUCH, !!cr0); + input_sync(priv->idev); + } else + dev_dbg(&priv->idev->dev, "discard event\n"); +} + +static void mc13783_ts_work(struct work_struct *work) +{ + struct mc13783_ts_priv *priv = + container_of(work, struct mc13783_ts_priv, work.work); + unsigned int mode = MC13783_ADC_MODE_TS; + unsigned int channel = 12; + int ret; + + ret = mc13783_adc_do_conversion(priv->mc13783, mode, channel, + priv->sample); + + if (!ret) + mc13783_ts_report_sample(priv); +} + +static int mc13783_ts_open(struct input_dev *dev) +{ + struct mc13783_ts_priv *priv = input_get_drvdata(dev); + int ret; + + mc13783_lock(priv->mc13783); + + mc13783_ackirq(priv->mc13783, MC13783_IRQ_TS); + + ret = mc13783_irq_request(priv->mc13783, MC13783_IRQ_TS, + mc13783_ts_handler, MC13783_TS_NAME, priv); + if (ret) + goto out; + + ret = mc13783_reg_rmw(priv->mc13783, MC13783_ADC0, + MC13783_ADC0_TSMOD_MASK, MC13783_ADC0_TSMOD0); + +out: + mc13783_unlock(priv->mc13783); + + return ret; +} + +static void mc13783_ts_close(struct input_dev *dev) +{ + struct mc13783_ts_priv *priv = input_get_drvdata(dev); + + mc13783_lock(priv->mc13783); + mc13783_reg_rmw(priv->mc13783, MC13783_ADC0, + MC13783_ADC0_TSMOD_MASK, 0); + mc13783_irq_free(priv->mc13783, MC13783_IRQ_TS, priv); + mc13783_unlock(priv->mc13783); +} + +static int __init mc13783_ts_probe(struct platform_device *pdev) +{ + struct mc13783_ts_priv *priv; + struct input_dev *idev; + int ret; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->mc13783 = dev_get_drvdata(pdev->dev.parent); + + idev = input_allocate_device(); + if (!idev) { + ret = -ENOMEM; + goto err_input_alloc; + } + + priv->idev = idev; + idev->name = MC13783_TS_NAME; + idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + idev->open = mc13783_ts_open; + idev->close = mc13783_ts_close; + input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0); + input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0); + input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0); + + platform_set_drvdata(pdev, priv); + + INIT_DELAYED_WORK(&priv->work, mc13783_ts_work); + + priv->workq = create_singlethread_workqueue("mc13783_ts"); + if (!priv->workq) { + ret = -ENOMEM; + goto err_input_alloc; + } + + input_set_drvdata(idev, priv); + + ret = input_register_device(priv->idev); + if (ret) { + dev_err(&pdev->dev, + "register input device failed with %d\n", ret); + goto err_failed_register; + } + + return 0; + +err_failed_register: + input_free_device(priv->idev); + +err_input_alloc: + platform_set_drvdata(pdev, NULL); + kfree(priv); + + return ret; +} + +static int __devexit mc13783_ts_remove(struct platform_device *pdev) +{ + struct mc13783_ts_priv *priv = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + + cancel_delayed_work(&priv->work); + destroy_workqueue(priv->workq); + + input_unregister_device(priv->idev); + + kfree(priv); + + return 0; +} + +static struct platform_driver mc13783_ts_driver = { + .remove = __devexit_p(mc13783_ts_remove), + .driver = { + .owner = THIS_MODULE, + .name = MC13783_TS_NAME, + }, +}; + +static int __init mc13783_ts_init(void) +{ + return platform_driver_probe(&mc13783_ts_driver, &mc13783_ts_probe); +} +module_init(mc13783_ts_init); + +static void __exit mc13783_ts_exit(void) +{ + platform_driver_unregister(&mc13783_ts_driver); +} +module_exit(mc13783_ts_exit); + +MODULE_DESCRIPTION("MC13783 input touchscreen driver"); +MODULE_AUTHOR("Sascha Hauer "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" MC13783_TS_NAME);