From patchwork Wed Dec 14 14:00:30 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andi Shyti X-Patchwork-Id: 9474197 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D3DB160571 for ; Wed, 14 Dec 2016 14:01:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C60B0286FE for ; Wed, 14 Dec 2016 14:01:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BA73828724; Wed, 14 Dec 2016 14:01:32 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6A590286FE for ; Wed, 14 Dec 2016 14:01:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756087AbcLNOBL (ORCPT ); Wed, 14 Dec 2016 09:01:11 -0500 Received: from mailout4.samsung.com ([203.254.224.34]:44279 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753821AbcLNOBE (ORCPT ); Wed, 14 Dec 2016 09:01:04 -0500 Received: from epcpsbgm2new.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0OI601QEOHKY4SE0@mailout4.samsung.com>; Wed, 14 Dec 2016 23:00:45 +0900 (KST) X-AuditID: cbfee61b-f796f6d000004092-2d-5851508c4d00 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm2new.samsung.com (EPCPMTA) with SMTP id 5F.F7.16530.C8051585; Wed, 14 Dec 2016 23:00:44 +0900 (KST) Received: from gangnam.samsung ([10.113.62.47]) by mmp2.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0OI60001AHL56DC0@mmp2.samsung.com>; Wed, 14 Dec 2016 23:00:44 +0900 (KST) From: Andi Shyti To: Mauro Carvalho Chehab , Sean Young , Rob Herring , Mark Rutland , Richard Purdie , Jacek Anaszewski , Heiner Kallweit Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, Andi Shyti , Andi Shyti Subject: [PATCH v4 6/6] [media] rc: add support for IR LEDs driven through SPI Date: Wed, 14 Dec 2016 23:00:30 +0900 Message-id: <20161214140030.28537-7-andi.shyti@samsung.com> X-Mailer: git-send-email 2.10.2 In-reply-to: <20161214140030.28537-1-andi.shyti@samsung.com> References: <20161214140030.28537-1-andi.shyti@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t9jQd2egMAIg2UNthbbjzxjtVj84zmT xfwj51gtFr2fwWrRe/U5o8XlXXPYLLa+Wcdo0bNhK6vF0usXmSxWP6uwaN17hN1i966nrBYL n35nceD1WDNvDaPH9SWfmD12zrrL7rFpVSebx5I31h5b+oG8PfN/sHr0bVnF6PF5k1wAZ5Sb TUZqYkpqkUJqXnJ+SmZeuq1SaIibroWSQl5ibqqtUoSub0iQkkJZYk4pkGdkgAYcnAPcg5X0 7RLcMk6dvcZSsNqhYuZa1gbGL0ZdjJwcEgImEl8+vGaBsMUkLtxbz9bFyMUhJDCLUaLxyEsW COcjo8SOxWfAqtgENCWabv8AqxIRmM4k8fXLAbAEs8BeRom9H31AbGEBP4kNm46wg9gsAqoS x6dOZAKxeQWsJc7P28wOsU5eYuH5I2BxTgEbiT1dz8BsIaCa59tnMk9g5F3AyLCKUSK1ILmg OCk91ygvtVyvODG3uDQvXS85P3cTIzhqnknvYDy8y/0QowAHoxIPbwIwmoRYE8uKK3MPMUpw MCuJ8E7xBQrxpiRWVqUW5ccXleakFh9iNAU6bCKzlGhyPjCi80riDU3MTcyNDSzMLS1NjJTE eRtnPwsXEkhPLEnNTk0tSC2C6WPi4JRqYFz6dLrUxFsZ7wKrLsldX7jOtqo0Zomw15LrG/fc rNkYcEIruTXkXuo0l/a9N9vEddx33+WYG2LN5fq6fv4l5RdHWo+xbn11I3hnDkusZGq7l8mH lM6CX6aeDJMndi699bTjYCLzmVMLrjCtN0jd9cj/8sR/kXdVxBWmL5etsth7wHH5m41L2t8r sRRnJBpqMRcVJwIABe5jKLACAAA= X-MTR: 20000000000000000@CPGS Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The ir-spi is a simple device driver which supports the connection between an IR LED and the MOSI line of an SPI device. The driver, indeed, uses the SPI framework to stream the raw data provided by userspace through an rc character device. The chardev is handled by the LIRC framework and its functionality basically provides: - write: the driver gets a pulse/space signal and translates it to a binary signal that will be streamed to the IR led through the SPI framework. - set frequency: sets the frequency whith which the data should be sent. This is handle with ioctl with the LIRC_SET_SEND_CARRIER flag (as per lirc documentation) - set duty cycle: this is also handled with ioctl with the LIRC_SET_SEND_DUTY_CYCLE flag. The driver handles duty cycles of 50%, 60%, 70%, 75%, 80% and 90%, calculated on 16bit data. The character device is created under /dev/lircX name, where X is and ID assigned by the LIRC framework. Example of usage: fd = open("/dev/lirc0", O_RDWR); if (fd < 0) return -1; val = 608000; ret = ioctl(fd, LIRC_SET_SEND_CARRIER, &val); if (ret < 0) return -1; val = 60; ret = ioctl(fd, LIRC_SET_SEND_DUTY_CYCLE, &val); if (ret < 0) return -1; n = write(fd, buffer, BUF_LEN); if (n < 0 || n != BUF_LEN) ret = -1; close(fd); Signed-off-by: Andi Shyti Reviewed-by: Sean Young --- drivers/media/rc/Kconfig | 9 +++ drivers/media/rc/Makefile | 1 + drivers/media/rc/ir-spi.c | 199 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 209 insertions(+) create mode 100644 drivers/media/rc/ir-spi.c diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig index 629e8ca..3351e25 100644 --- a/drivers/media/rc/Kconfig +++ b/drivers/media/rc/Kconfig @@ -261,6 +261,15 @@ config IR_REDRAT3 To compile this driver as a module, choose M here: the module will be called redrat3. +config IR_SPI + tristate "SPI connected IR LED" + depends on SPI && LIRC + ---help--- + Say Y if you want to use an IR LED connected through SPI bus. + + To compile this driver as a module, choose M here: the module will be + called ir-spi. + config IR_STREAMZAP tristate "Streamzap PC Remote IR Receiver" depends on USB_ARCH_HAS_HCD diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile index 3a984ee..938c98b 100644 --- a/drivers/media/rc/Makefile +++ b/drivers/media/rc/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_IR_NUVOTON) += nuvoton-cir.o obj-$(CONFIG_IR_ENE) += ene_ir.o obj-$(CONFIG_IR_REDRAT3) += redrat3.o obj-$(CONFIG_IR_RX51) += ir-rx51.o +obj-$(CONFIG_IR_SPI) += ir-spi.o obj-$(CONFIG_IR_STREAMZAP) += streamzap.o obj-$(CONFIG_IR_WINBOND_CIR) += winbond-cir.o obj-$(CONFIG_RC_LOOPBACK) += rc-loopback.o diff --git a/drivers/media/rc/ir-spi.c b/drivers/media/rc/ir-spi.c new file mode 100644 index 0000000..d45c603 --- /dev/null +++ b/drivers/media/rc/ir-spi.c @@ -0,0 +1,199 @@ +/* + * Copyright (c) 2016 Samsung Electronics Co., Ltd. + * Author: Andi Shyti + * + * 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. + * + * SPI driven IR LED device driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define IR_SPI_DRIVER_NAME "ir-spi" + +/* pulse value for different duty cycles */ +#define IR_SPI_PULSE_DC_50 0xff00 +#define IR_SPI_PULSE_DC_60 0xfc00 +#define IR_SPI_PULSE_DC_70 0xf800 +#define IR_SPI_PULSE_DC_75 0xf000 +#define IR_SPI_PULSE_DC_80 0xc000 +#define IR_SPI_PULSE_DC_90 0x8000 + +#define IR_SPI_DEFAULT_FREQUENCY 38000 +#define IR_SPI_BIT_PER_WORD 8 +#define IR_SPI_MAX_BUFSIZE 4096 + +struct ir_spi_data { + u32 freq; + u8 duty_cycle; + bool negated; + + u16 tx_buf[IR_SPI_MAX_BUFSIZE]; + u16 pulse; + u16 space; + + struct rc_dev *rc; + struct spi_device *spi; + struct regulator *regulator; +}; + +static int ir_spi_tx(struct rc_dev *dev, + unsigned int *buffer, unsigned int count) +{ + int i; + int ret; + unsigned int len = 0; + struct ir_spi_data *idata = dev->priv; + struct spi_transfer xfer; + + /* convert the pulse/space signal to raw binary signal */ + for (i = 0; i < count; i++) { + int j; + u16 val = ((i+1) % 2) ? idata->pulse : idata->space; + + if (len + buffer[i] >= IR_SPI_MAX_BUFSIZE) + return -EINVAL; + + /* + * the first value in buffer is a pulse, so that 0, 2, 4, ... + * contain a pulse duration. On the contrary, 1, 3, 5, ... + * contain a space duration. + */ + val = (i % 2) ? idata->space : idata->pulse; + for (j = 0; j < buffer[i]; j++) + idata->tx_buf[len++] = val; + } + + memset(&xfer, 0, sizeof(xfer)); + + xfer.speed_hz = idata->freq; + xfer.len = len * sizeof(*idata->tx_buf); + xfer.tx_buf = idata->tx_buf; + + ret = regulator_enable(idata->regulator); + if (ret) + return ret; + + ret = spi_sync_transfer(idata->spi, &xfer, 1); + if (ret) + dev_err(&idata->spi->dev, "unable to deliver the signal\n"); + + regulator_disable(idata->regulator); + + return ret ? ret : count; +} + +static int ir_spi_set_tx_carrier(struct rc_dev *dev, u32 carrier) +{ + struct ir_spi_data *idata = dev->priv; + + if (!carrier) + return -EINVAL; + + idata->freq = carrier; + + return 0; +} + +static int ir_spi_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle) +{ + struct ir_spi_data *idata = dev->priv; + + if (duty_cycle >= 90) + idata->pulse = IR_SPI_PULSE_DC_90; + else if (duty_cycle >= 80) + idata->pulse = IR_SPI_PULSE_DC_80; + else if (duty_cycle >= 75) + idata->pulse = IR_SPI_PULSE_DC_75; + else if (duty_cycle >= 70) + idata->pulse = IR_SPI_PULSE_DC_70; + else if (duty_cycle >= 60) + idata->pulse = IR_SPI_PULSE_DC_60; + else + idata->pulse = IR_SPI_PULSE_DC_50; + + if (idata->negated) { + idata->pulse = ~idata->pulse; + idata->space = 0xffff; + } else { + idata->space = 0; + } + + return 0; +} + +static int ir_spi_probe(struct spi_device *spi) +{ + int ret; + u8 dc; + struct ir_spi_data *idata; + + idata = devm_kzalloc(&spi->dev, sizeof(*idata), GFP_KERNEL); + if (!idata) + return -ENOMEM; + + idata->regulator = devm_regulator_get(&spi->dev, "irda_regulator"); + if (IS_ERR(idata->regulator)) + return PTR_ERR(idata->regulator); + + idata->rc = devm_rc_allocate_device(&spi->dev, RC_DRIVER_IR_RAW_TX); + if (!idata->rc) + return -ENOMEM; + + idata->rc->tx_ir = ir_spi_tx; + idata->rc->s_tx_carrier = ir_spi_set_tx_carrier; + idata->rc->s_tx_duty_cycle = ir_spi_set_duty_cycle; + idata->rc->driver_name = IR_SPI_DRIVER_NAME; + idata->rc->priv = idata; + idata->spi = spi; + + idata->negated = of_property_read_bool(spi->dev.of_node, + "led-active-low"); + ret = of_property_read_u8(spi->dev.of_node, "duty-cycle", &dc); + if (ret) + dc = 50; + + /* ir_spi_set_duty_cycle cannot fail, + * it returns int to be compatible with the + * rc->s_tx_duty_cycle function + */ + ir_spi_set_duty_cycle(idata->rc, dc); + + idata->freq = IR_SPI_DEFAULT_FREQUENCY; + + return devm_rc_register_device(&spi->dev, idata->rc); +} + +static int ir_spi_remove(struct spi_device *spi) +{ + return 0; +} + +static const struct of_device_id ir_spi_of_match[] = { + { .compatible = "ir-spi-led" }, + {}, +}; + +static struct spi_driver ir_spi_driver = { + .probe = ir_spi_probe, + .remove = ir_spi_remove, + .driver = { + .name = IR_SPI_DRIVER_NAME, + .of_match_table = ir_spi_of_match, + }, +}; + +module_spi_driver(ir_spi_driver); + +MODULE_AUTHOR("Andi Shyti "); +MODULE_DESCRIPTION("SPI IR LED"); +MODULE_LICENSE("GPL v2");