From patchwork Fri Nov 27 01:34:27 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Smirl X-Patchwork-Id: 2195 Return-path: Envelope-to: mchehab@infradead.org Delivery-date: Fri, 27 Nov 2009 01:35:19 +0000 Received: from bombadil.infradead.org [18.85.46.34] by pedra with IMAP (fetchmail-6.3.6) for (single-drop); Thu, 26 Nov 2009 23:36:04 -0200 (BRST) Received: from vger.kernel.org ([209.132.176.167]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1NDpjy-0005Tc-VE; Fri, 27 Nov 2009 01:35:19 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753128AbZK0Bew (ORCPT + 1 other); Thu, 26 Nov 2009 20:34:52 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753070AbZK0Bev (ORCPT ); Thu, 26 Nov 2009 20:34:51 -0500 Received: from qw-out-2122.google.com ([74.125.92.25]:59852 "EHLO qw-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752392AbZK0BeY (ORCPT ); Thu, 26 Nov 2009 20:34:24 -0500 Received: by qw-out-2122.google.com with SMTP id 3so223203qwe.37 for ; Thu, 26 Nov 2009 17:34:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:received:subject:to:from:date :message-id:in-reply-to:references:user-agent:mime-version :content-type:content-transfer-encoding; bh=o22F3FXC05xkK19cdqctCOMIHi/9JEWsNLH9+gk9xgE=; b=NeGgoZFjZQkKZMJi8DN6kDHDfKImTpl043GmZVxdrbVcUEvgsKvf0zcgEm34zTZPci kIGeCKQsLcHpNUy1jiTRtvdWsB9toBao64Xg1tXBao9ebzycMEtJ4slEfGHEZV4gC2vD jVp0oNkF7xOyQPMxVCQt5KEnCzuP1ZIxKaJzc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:to:from:date:message-id:in-reply-to:references:user-agent :mime-version:content-type:content-transfer-encoding; b=UAWd1bd5D1Ay/VMg/HKe8xfZWGdqz+TjQDxiUS7QdrMmXkqRckrF+9WpqtRyJMDRGc d25fdNKtvzoPqbNQ5Z4hUBQx9HKr6+qrdpNuYXzmgj+rTuE1KVDI3Iz+iNcindBzGLNX OHmvlLfC2YZqV7VSc1sXttPBf9QNWtdfmomzk= Received: by 10.224.91.196 with SMTP id o4mr203119qam.233.1259285669471; Thu, 26 Nov 2009 17:34:29 -0800 (PST) Received: from terra (c-65-96-16-179.hsd1.ma.comcast.net [65.96.16.179]) by mx.google.com with ESMTPS id 26sm3437247qwa.0.2009.11.26.17.34.28 (version=TLSv1/SSLv3 cipher=RC4-MD5); Thu, 26 Nov 2009 17:34:28 -0800 (PST) Received: from localhost ([127.0.0.1] helo=[127.0.1.1]) by terra with esmtp (Exim 4.69) (envelope-from ) id 1NDpj9-00021Y-L3; Thu, 26 Nov 2009 20:34:27 -0500 Subject: [IR-RFC PATCH v4 4/6] GPT driver for in-kernel IR support. To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org From: Jon Smirl Date: Thu, 26 Nov 2009 20:34:27 -0500 Message-ID: <20091127013427.7671.52935.stgit@terra> In-Reply-To: <20091127013217.7671.32355.stgit@terra> References: <20091127013217.7671.32355.stgit@terra> User-Agent: StGit/0.15 MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org GPT is a GPIO pin that is cable able of measuring the lenght of pulses. GPTs are common on embedded systems --- drivers/input/ir/Kconfig | 6 + drivers/input/ir/Makefile | 3 + drivers/input/ir/ir-gpt.c | 184 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+), 0 deletions(-) create mode 100644 drivers/input/ir/ir-gpt.c -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/input/ir/Kconfig b/drivers/input/ir/Kconfig index a6f3f25..172c0c6 100644 --- a/drivers/input/ir/Kconfig +++ b/drivers/input/ir/Kconfig @@ -12,4 +12,10 @@ menuconfig INPUT_IR if INPUT_IR +config IR_GPT + tristate "GPT Based IR Receiver" + default m + help + Driver for GPT-based IR receiver found on Digispeaker + endif diff --git a/drivers/input/ir/Makefile b/drivers/input/ir/Makefile index 2ccdda3..ab0da3f 100644 --- a/drivers/input/ir/Makefile +++ b/drivers/input/ir/Makefile @@ -6,3 +6,6 @@ obj-$(CONFIG_INPUT_IR) += ir.o ir-objs := ir-core.o ir-configfs.o + +obj-$(CONFIG_IR_GPT) += ir-gpt.o + diff --git a/drivers/input/ir/ir-gpt.c b/drivers/input/ir/ir-gpt.c new file mode 100644 index 0000000..41d2fa6 --- /dev/null +++ b/drivers/input/ir/ir-gpt.c @@ -0,0 +1,184 @@ +/* + * GPT timer based IR device + * + * Copyright (C) 2008 Jon Smirl + */ + +#define DEBUG + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct ir_gpt { + struct input_dev *input; + int irq, previous; + struct mpc52xx_gpt __iomem *regs; +}; + +/* + * Interrupt handlers + */ +static irqreturn_t dpeak_ir_irq(int irq, void *_ir) +{ + struct ir_gpt *ir_gpt = _ir; + int sample, count, delta, bit, wrap; + + sample = in_be32(&ir_gpt->regs->status); + out_be32(&ir_gpt->regs->status, 0xF); + + count = sample >> 16; + wrap = (sample >> 12) & 7; + bit = (sample >> 8) & 1; + + delta = count - ir_gpt->previous; + delta += wrap * 0x10000; + + ir_gpt->previous = count; + + if (bit) + delta = -delta; + + input_ir_queue(ir_gpt->input, delta); + + return IRQ_HANDLED; +} + + +/* --------------------------------------------------------------------- + * OF platform bus binding code: + * - Probe/remove operations + * - OF device match table + */ +static int __devinit ir_gpt_of_probe(struct of_device *op, + const struct of_device_id *match) +{ + struct ir_gpt *ir_gpt; + struct resource res; + int ret, rc; + + dev_dbg(&op->dev, "ir_gpt_of_probe\n"); + + /* Allocate and initialize the driver private data */ + ir_gpt = kzalloc(sizeof *ir_gpt, GFP_KERNEL); + if (!ir_gpt) + return -ENOMEM; + + ir_gpt->input = input_allocate_device(); + if (!ir_gpt->input) { + ret = -ENOMEM; + goto free_mem; + } + ret = input_ir_create(ir_gpt->input, ir_gpt, NULL); + if (ret) + goto free_input; + + ir_gpt->input->id.bustype = BUS_HOST; + ir_gpt->input->name = "GPT IR Receiver"; + + ir_gpt->input->irbit[0] |= BIT_MASK(IR_CAP_RECEIVE_36K); + ir_gpt->input->irbit[0] |= BIT_MASK(IR_CAP_RECEIVE_38K); + ir_gpt->input->irbit[0] |= BIT_MASK(IR_CAP_RECEIVE_40K); + ir_gpt->input->irbit[0] |= BIT_MASK(IR_CAP_RECEIVE_RAW); + + ret = input_register_device(ir_gpt->input); + if (ret) + goto free_input; + ret = input_ir_register(ir_gpt->input); + if (ret) + goto free_input; + + /* Fetch the registers and IRQ of the GPT */ + if (of_address_to_resource(op->node, 0, &res)) { + dev_err(&op->dev, "Missing reg property\n"); + ret = -ENODEV; + goto free_input; + } + ir_gpt->regs = ioremap(res.start, 1 + res.end - res.start); + if (!ir_gpt->regs) { + dev_err(&op->dev, "Could not map registers\n"); + ret = -ENODEV; + goto free_input; + } + ir_gpt->irq = irq_of_parse_and_map(op->node, 0); + if (ir_gpt->irq == NO_IRQ) { + ret = -ENODEV; + goto free_input; + } + dev_dbg(&op->dev, "ir_gpt_of_probe irq=%d\n", ir_gpt->irq); + + rc = request_irq(ir_gpt->irq, &dpeak_ir_irq, IRQF_SHARED, + "gpt-ir", ir_gpt); + dev_dbg(&op->dev, "ir_gpt_of_probe request irq rc=%d\n", rc); + + /* set prescale to ? */ + out_be32(&ir_gpt->regs->count, 0x00870000); + + /* Select input capture, enable the counter, and interrupt */ + out_be32(&ir_gpt->regs->mode, 0x0); + out_be32(&ir_gpt->regs->mode, 0x00000501); + + /* Save what we've done so it can be found again later */ + dev_set_drvdata(&op->dev, ir_gpt); + + printk("GPT IR Receiver driver\n"); + + return 0; + +free_input: + input_free_device(ir_gpt->input); +free_mem: + kfree(ir_gpt); + return ret; +} + +static int __devexit ir_gpt_of_remove(struct of_device *op) +{ + struct ir_gpt *ir_gpt = dev_get_drvdata(&op->dev); + + dev_dbg(&op->dev, "ir_gpt_remove()\n"); + + input_unregister_device(ir_gpt->input); + kfree(ir_gpt); + dev_set_drvdata(&op->dev, NULL); + + return 0; +} + +/* Match table for of_platform binding */ +static struct of_device_id ir_gpt_match[] __devinitdata = { + { .compatible = "gpt-ir", }, + {} +}; +MODULE_DEVICE_TABLE(of, ir_gpt_match); + +static struct of_platform_driver ir_gpt_driver = { + .match_table = ir_gpt_match, + .probe = ir_gpt_of_probe, + .remove = __devexit_p(ir_gpt_of_remove), + .driver = { + .name = "ir-gpt", + .owner = THIS_MODULE, + }, +}; + +/* --------------------------------------------------------------------- + * Module setup and teardown; simply register the of_platform driver + */ +static int __init ir_gpt_init(void) +{ + return of_register_platform_driver(&ir_gpt_driver); +} +module_init(ir_gpt_init); + +static void __exit ir_gpt_exit(void) +{ + of_unregister_platform_driver(&ir_gpt_driver); +} +module_exit(ir_gpt_exit);