From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755692AbcKBKlE (ORCPT ); Wed, 2 Nov 2016 06:41:04 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:49863 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755625AbcKBKlA (ORCPT ); Wed, 2 Nov 2016 06:41:00 -0400 X-AuditID: cbfee61b-f793d6d000005a2a-93-5819c2a679ce From: Andi Shyti To: Mauro Carvalho Chehab , Sean Young , Rob Herring , Mark Rutland , Richard Purdie , Jacek Anaszewski 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 v3 6/6] [media] rc: add support for IR LEDs driven through SPI Date: Wed, 02 Nov 2016 19:40:10 +0900 Message-id: <20161102104010.26959-7-andi.shyti@samsung.com> X-Mailer: git-send-email 2.10.1 In-reply-to: <20161102104010.26959-1-andi.shyti@samsung.com> References: <20161102104010.26959-1-andi.shyti@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprCIsWRmVeSWpSXmKPExsVy+t9jAd1lhyQjDF5+ELPYfuQZq8XiH8+Z LOYfOcdq0Xv1OaPF5V1z2Cy2vlnHaNGzYSurxdLrF5ksVj+rsGjde4TdYveup6wWC59+Z3Hg 8Vgzbw2jx/Uln5g9Nq3qZPNY8sbaY0v/XXaPPfN/sHr0bVnF6PF5k1wAR5SbTUZqYkpqkUJq XnJ+SmZeuq1SaIibroWSQl5ibqqtUoSub0iQkkJZYk4pkGdkgAYcnAPcg5X07RLcMo7NW8ZY cNShYvfc9cwNjC3GXYycHBICJhIrlv9khLDFJC7cW8/WxcjFISSwlFHiRt98RgjnI6PEtzO/ mUGq2AQ0JZpu/wCrEhF4yyhxaPorsHZmgb2MEns/+oDYwgJ+EveO3mcFsVkEVCXm/z3LDmLz ClhLzH+3hglinbzEhaunWEBsTgEbib+Nj8FqhIBqDlzfzz6BkXcBI8MqRonUguSC4qT0XKO8 1HK94sTc4tK8dL3k/NxNjOAYeSa9g/HwLvdDjAIcjEo8vAWXJSKEWBPLiitzDzFKcDArifB+ 2ycZIcSbklhZlVqUH19UmpNafIjRFOiwicxSosn5wPjNK4k3NDE3MTc2sDC3tDQxUhLnbZz9 LFxIID2xJDU7NbUgtQimj4mDU6qBkSv9zN6Or8vCpjAs9Y1e99alcIrqlNdnEt/mLHgqHFHX u4vzTfOjqcFlSXMvb7z+n8U9//INc/mHz1vUYx7zbvD7mdR955vFnq9p3S8z32ypDF6x0X3R ZZuV6V9mspxt32zh3S78x8cq9XGlaI9NrH7pwneRZSc7mG3USyzXbr/qcYWDtTmtSImlOCPR UIu5qDgRAAWzPwKnAgAA X-MTR: 20000000000000000@CPGS Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 | 205 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 215 insertions(+) create mode 100644 drivers/media/rc/ir-spi.c diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig index 370e16e..207dfcc 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 379a5c0..1417c8d 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..fcda1e4 --- /dev/null +++ b/drivers/media/rc/ir-spi.c @@ -0,0 +1,205 @@ +/* + * 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 = rc_allocate_device(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; + + ret = ir_spi_set_duty_cycle(idata->rc, dc); + if (ret) + return ret; + + idata->freq = IR_SPI_DEFAULT_FREQUENCY; + + ret = rc_register_device(idata->rc); + if (ret) + rc_free_device(idata->rc); + + return ret; +} + +static int ir_spi_remove(struct spi_device *spi) +{ + struct ir_spi_data *idata = spi_get_drvdata(spi); + + rc_unregister_device(idata->rc); + + 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"); -- 2.10.1