From patchwork Thu Sep 1 17:16:29 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andi Shyti X-Patchwork-Id: 9309735 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 C544F60760 for ; Thu, 1 Sep 2016 21:29:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88DD22951E for ; Thu, 1 Sep 2016 21:29:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7CB642954A; Thu, 1 Sep 2016 21:29:05 +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=unavailable 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 7F9712951E for ; Thu, 1 Sep 2016 21:29:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755815AbcIAV1z (ORCPT ); Thu, 1 Sep 2016 17:27:55 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:44395 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757245AbcIAV1Y (ORCPT ); Thu, 1 Sep 2016 17:27:24 -0400 Received: from epcpsbgr1.samsung.com (u141.gpu120.samsung.co.kr [203.254.230.141]) by mailout4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0OCU012RC5BQA2A0@mailout4.samsung.com>; Fri, 02 Sep 2016 02:16:38 +0900 (KST) Received: from epcpsbgm2new.samsung.com ( [172.20.52.113]) by epcpsbgr1.samsung.com (EPCPMTA) with SMTP id B3.02.31386.67268C75; Fri, 2 Sep 2016 02:16:38 +0900 (KST) X-AuditID: cbfee68d-f79286d000007a9a-67-57c8627688da Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2new.samsung.com (EPCPMTA) with SMTP id 41.05.07740.67268C75; Thu, 1 Sep 2016 10:16:38 -0700 (MST) Received: from samsunx.samsung ([10.113.63.54]) by mmp1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0OCU00L0B5BMT280@mmp1.samsung.com>; Fri, 02 Sep 2016 02:16:38 +0900 (KST) From: Andi Shyti To: Mauro Carvalho Chehab , Sean Young , Rob Herring , Mark Rutland Cc: linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Andi Shyti , Andi Shyti Subject: [PATCH v2 7/7] [media] rc: add support for IR LEDs driven through SPI Date: Fri, 02 Sep 2016 02:16:29 +0900 Message-id: <20160901171629.15422-8-andi.shyti@samsung.com> X-Mailer: git-send-email 2.9.3 In-reply-to: <20160901171629.15422-1-andi.shyti@samsung.com> References: <20160901171629.15422-1-andi.shyti@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrPLMWRmVeSWpSXmKPExsWyRsSkULcs6US4wfqP8hbbjzxjtVj84zmT xfwj51gtLu+aw2bRs2Erq8XS6xeZLFY/q7Bo3XuE3WLh0+8sDpwea+atYfS4vuQTs8emVZ1s HkveWHts6b/L7tG3ZRWjx+dNcgHsUVw2Kak5mWWpRfp2CVwZzVc/sBScca5YsnUfYwPjNdMu Rk4OCQETiYUbVrFB2GISF+6tB7K5OIQEVjBKPJ64mB2maObMiSwQiaWMEvual7JDOB8ZJVa8 OcYMUsUmoCnRdPsHWLuIwCxGiddTf4AlmAUWMkps+KwMYgsL+El8nnOUCcRmEVCVeHX0FJjN K2At8aB5IivEOjmJS9u+gPVyCthITD59GSwuBFRzYP1ksAUSAtvYJS7fmQ01SEDi2+RDQPdx ACVkJTYdYIaYIylxcMUNlgmMwgsYGVYxiqYWJBcUJ6UXGeoVJ+YWl+al6yXn525iBMbD6X/P encw3j5gfYhRgINRiYf3RcKJcCHWxLLiytxDjKZAGyYyS4km5wOjLq8k3tDYzMjC1MTU2Mjc 0kxJnFdR6mewkEB6YklqdmpqQWpRfFFpTmrxIUYmDk6pBsa56zbvK9Qyn6Wa93Tllly1A35G cyN2NBvV8DyMvOnauC1ZvvJjYdrfsk/9c0r+5T3INFjE3Fzzi80vrjFjid+Rfa2/Nno/tTj5 Ys7FFU+2T8iWWsKx8HWS++py3YufCz2r6rZp/fuomNTzs6gsZgH/kbJPG+d8Ftb6G3B65RIG 9tkHXCb+09NXYinOSDTUYi4qTgQAzT2IFIICAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDIsWRmVeSWpSXmKPExsVy+t9jAd2ypBPhBmsPSFpsP/KM1WLxj+dM FvOPnGO1uLxrDptFz4atrBZLr19kslj9rMKide8RdouFT7+zOHB6rJm3htHj+pJPzB6bVnWy eSx5Y+2xpf8uu0ffllWMHp83yQWwRzUw2mSkJqakFimk5iXnp2TmpdsqeQfHO8ebmhkY6hpa WpgrKeQl5qbaKrn4BOi6ZeYAXaakUJaYUwoUCkgsLlbSt8M0ITTETdcCpjFC1zckCK7HyAAN JKxhzGi++oGl4IxzxZKt+xgbGK+ZdjFyckgImEjMnDmRBcIWk7hwbz1bFyMXh5DAUkaJfc1L 2SGcj4wSK94cYwapYhPQlGi6/QOsSkRgFqPE66k/wBLMAgsZJTZ8VgaxhQX8JD7POcoEYrMI qEq8OnoKzOYVsJZ40DyRFWKdnMSlbV/AejkFbCQmn74MFhcCqjmwfjLbBEbeBYwMqxglUguS C4qT0nON8lLL9YoTc4tL89L1kvNzNzGCY+6Z9A7Gw7vcDzEKcDAq8fA2BJwIF2JNLCuuzD3E KMHBrCTCyxYPFOJNSaysSi3Kjy8qzUktPsRoCnTYRGYp0eR8YDrIK4k3NDYxM7I0Mje0MDI2 VxLnffx/XZiQQHpiSWp2ampBahFMHxMHp1QDo+Wa+iVyhqdTeT1rsrfucFRyKH7T0SLC9+Vr z7630XVr0jQTdl5cckH/5pqnvCEF0+L35xWkVsYnW57R3t0lMIfpUf2kY8YeprNq16z+s/nG k4QdccufLz7z3mJ+hJeh6Qu2QvEdGdekZkb9/dKw6aKbXOtd3p59TF7zEieyVdjv4p4kO/uk ihJLcUaioRZzUXEiAAxajprPAgAA DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected 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 --- drivers/media/rc/Kconfig | 9 ++ drivers/media/rc/Makefile | 1 + drivers/media/rc/ir-spi.c | 221 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 231 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..34d5a0c --- /dev/null +++ b/drivers/media/rc/ir-spi.c @@ -0,0 +1,221 @@ +/* + * 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 + +/* duty cycles values */ +#define IR_SPI_DUTY_CYCLE_50 50 +#define IR_SPI_DUTY_CYCLE_60 60 +#define IR_SPI_DUTY_CYCLE_70 70 +#define IR_SPI_DUTY_CYCLE_75 75 +#define IR_SPI_DUTY_CYCLE_80 80 +#define IR_SPI_DUTY_CYCLE_90 90 + +#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; + } + + pr_info("from %u data, we originated %u raw data\n", count, len); + + 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 : len; +} + +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; + + switch (duty_cycle) { + case IR_SPI_DUTY_CYCLE_90: + idata->pulse = IR_SPI_PULSE_DC_90; + break; + case IR_SPI_DUTY_CYCLE_80: + idata->pulse = IR_SPI_PULSE_DC_80; + break; + case IR_SPI_DUTY_CYCLE_75: + idata->pulse = IR_SPI_PULSE_DC_75; + break; + case IR_SPI_DUTY_CYCLE_70: + idata->pulse = IR_SPI_PULSE_DC_70; + break; + case IR_SPI_DUTY_CYCLE_60: + idata->pulse = IR_SPI_PULSE_DC_60; + break; + case IR_SPI_DUTY_CYCLE_50: + default: + 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, "negated"); + ret = of_property_read_u8(spi->dev.of_node, "duty-cycle", &dc); + if (ret) + dc = IR_SPI_DUTY_CYCLE_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_unregister_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" }, + {}, +}; + +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");