From: Hans Verkuil <hans.verk...@cisco.com> This driver supports the RainShadow Tech USB HDMI CEC adapter.
See: http://rainshadowtech.com/HdmiCecUsb.html Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> --- MAINTAINERS | 7 + drivers/media/usb/Kconfig | 1 + drivers/media/usb/Makefile | 1 + drivers/media/usb/rainshadow-cec/Kconfig | 10 + drivers/media/usb/rainshadow-cec/Makefile | 1 + drivers/media/usb/rainshadow-cec/rainshadow-cec.c | 344 ++++++++++++++++++++++ 6 files changed, 364 insertions(+) create mode 100644 drivers/media/usb/rainshadow-cec/Kconfig create mode 100644 drivers/media/usb/rainshadow-cec/Makefile create mode 100644 drivers/media/usb/rainshadow-cec/rainshadow-cec.c diff --git a/MAINTAINERS b/MAINTAINERS index 52cc077..78ebc5d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -10069,6 +10069,13 @@ L: linux-fb...@vger.kernel.org S: Maintained F: drivers/video/fbdev/aty/aty128fb.c +RAINSHADOW-CEC DRIVER +M: Hans Verkuil <hverk...@xs4all.nl> +L: linux-media@vger.kernel.org +T: git git://linuxtv.org/media_tree.git +S: Maintained +F: drivers/media/usb/rainshadow-cec/* + RALINK MIPS ARCHITECTURE M: John Crispin <j...@phrozen.org> L: linux-m...@linux-mips.org diff --git a/drivers/media/usb/Kconfig b/drivers/media/usb/Kconfig index c9644b6..b24e753 100644 --- a/drivers/media/usb/Kconfig +++ b/drivers/media/usb/Kconfig @@ -63,6 +63,7 @@ endif if MEDIA_CEC_SUPPORT comment "USB HDMI CEC adapters" source "drivers/media/usb/pulse8-cec/Kconfig" +source "drivers/media/usb/rainshadow-cec/Kconfig" endif endif #MEDIA_USB_SUPPORT diff --git a/drivers/media/usb/Makefile b/drivers/media/usb/Makefile index 0f15e33..738b993 100644 --- a/drivers/media/usb/Makefile +++ b/drivers/media/usb/Makefile @@ -25,3 +25,4 @@ obj-$(CONFIG_VIDEO_USBTV) += usbtv/ obj-$(CONFIG_VIDEO_GO7007) += go7007/ obj-$(CONFIG_DVB_AS102) += as102/ obj-$(CONFIG_USB_PULSE8_CEC) += pulse8-cec/ +obj-$(CONFIG_USB_RAINSHADOW_CEC) += rainshadow-cec/ diff --git a/drivers/media/usb/rainshadow-cec/Kconfig b/drivers/media/usb/rainshadow-cec/Kconfig new file mode 100644 index 0000000..447291b --- /dev/null +++ b/drivers/media/usb/rainshadow-cec/Kconfig @@ -0,0 +1,10 @@ +config USB_RAINSHADOW_CEC + tristate "RainShadow Tech HDMI CEC" + depends on USB_ACM && MEDIA_CEC_SUPPORT + select SERIO + select SERIO_SERPORT + ---help--- + This is a cec driver for the RainShadow Tech HDMI CEC device. + + To compile this driver as a module, choose M here: the + module will be called rainshadow-cec. diff --git a/drivers/media/usb/rainshadow-cec/Makefile b/drivers/media/usb/rainshadow-cec/Makefile new file mode 100644 index 0000000..a79fbc7 --- /dev/null +++ b/drivers/media/usb/rainshadow-cec/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_USB_RAINSHADOW_CEC) += rainshadow-cec.o diff --git a/drivers/media/usb/rainshadow-cec/rainshadow-cec.c b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c new file mode 100644 index 0000000..dc7f287 --- /dev/null +++ b/drivers/media/usb/rainshadow-cec/rainshadow-cec.c @@ -0,0 +1,344 @@ +/* + * RainShadow Tech HDMI CEC driver + * + * Copyright 2016 Hans Verkuil <hverk...@xs4all.nl + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version of 2 of the License, or (at your + * option) any later version. See the file COPYING in the main directory of + * this archive for more details. + */ + +/* + * Notes: + * + * The higher level protocols are currently disabled. This can be added + * later, similar to how this is done for the Pulse Eight CEC driver. + * + * Documentation of the protocol is available here: + * + * http://rainshadowtech.com/doc/HDMICECtoUSBandRS232v2.0.pdf + */ + +#include <linux/completion.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/workqueue.h> +#include <linux/serio.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <linux/delay.h> +#include <linux/ctype.h> + +#include <media/cec.h> + +MODULE_AUTHOR("Hans Verkuil <hverk...@xs4all.nl>"); +MODULE_DESCRIPTION("RainShadow Tech HDMI CEC driver"); +MODULE_LICENSE("GPL"); + +static int debug; +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "debug level (0-1)"); + +#define DATA_SIZE 256 + +struct rain { + struct device *dev; + struct serio *serio; + struct cec_adapter *adap; + struct completion cmd_done; + struct work_struct work; + struct cec_msg rx_msg; + char data[DATA_SIZE]; + char buf[DATA_SIZE]; + unsigned int idx; + bool started; + struct mutex write_lock; +}; + +static void rain_irq_work_handler(struct work_struct *work) +{ + struct rain *rain = + container_of(work, struct rain, work); + struct cec_msg *msg = &rain->rx_msg; + const char *data = rain->data + 3; + int stat = -1; + + msg->len = 0; + for (; *data; data++) { + if (!isxdigit(*data)) + continue; + if (isxdigit(data[0]) && isxdigit(data[1])) { + if (msg->len == CEC_MAX_MSG_SIZE) + break; + hex2bin(msg->msg + msg->len, data, 2); + msg->len++; + data++; + continue; + } + if (!data[1]) + stat = hex_to_bin(data[0]); + break; + } + + if (rain->data[0] == 'R') { + if (stat == 1 || stat == 2) + cec_received_msg(rain->adap, msg); + return; + } + + switch (stat) { + case 1: + cec_transmit_done(rain->adap, CEC_TX_STATUS_OK, + 0, 0, 0, 0); + break; + case 2: + cec_transmit_done(rain->adap, CEC_TX_STATUS_NACK, + 0, 1, 0, 0); + break; + default: + cec_transmit_done(rain->adap, CEC_TX_STATUS_LOW_DRIVE, + 0, 0, 0, 1); + break; + } +} + +static irqreturn_t rain_interrupt(struct serio *serio, unsigned char data, + unsigned int flags) +{ + struct rain *rain = serio_get_drvdata(serio); + + if (!rain->started && data != '?') + return IRQ_HANDLED; + if (data == '\r') { + rain->buf[rain->idx] = '\0'; + if (debug) + dev_info(rain->dev, "received: %s\n", rain->buf); + strcpy(rain->data, rain->buf); + if (!memcmp(rain->data, "REC", 3) || + !memcmp(rain->data, "STA", 3)) + schedule_work(&rain->work); + else + complete(&rain->cmd_done); + rain->idx = 0; + rain->started = false; + return IRQ_HANDLED; + } else if (data == '?') { + rain->idx = 0; + rain->started = true; + return IRQ_HANDLED; + } + + if (data == '\n') { + rain->idx = 0; + rain->started = false; + return IRQ_HANDLED; + } + if (rain->idx >= DATA_SIZE - 1) { + dev_dbg(rain->dev, + "throwing away %d bytes of garbage\n", rain->idx); + rain->idx = 0; + } + rain->buf[rain->idx++] = data; + return IRQ_HANDLED; +} + +static void rain_disconnect(struct serio *serio) +{ + struct rain *rain = serio_get_drvdata(serio); + + cec_unregister_adapter(rain->adap); + dev_info(&serio->dev, "disconnected\n"); + serio_close(serio); + serio_set_drvdata(serio, NULL); + kfree(rain); +} + +static int rain_send(struct rain *rain, const char *command) +{ + int err = serio_write(rain->serio, '!'); + + if (debug) + dev_info(rain->dev, "send: %s\n", command); + while (!err && *command) + err = serio_write(rain->serio, *command++); + if (!err) + err = serio_write(rain->serio, '~'); + + return err; +} + +static int rain_send_and_wait(struct rain *rain, + const char *cmd, const char *reply) +{ + int err; + + init_completion(&rain->cmd_done); + + mutex_lock(&rain->write_lock); + err = rain_send(rain, cmd); + if (err) + goto err; + + if (!wait_for_completion_timeout(&rain->cmd_done, HZ)) { + err = -ETIMEDOUT; + goto err; + } + if (reply && strncmp(rain->data, reply, strlen(reply))) { + if (debug) + dev_info(rain->dev, + "transmit of '%s': received '%s' instead of '%s'\n", + cmd, rain->data, reply); + err = -EIO; + } +err: + mutex_unlock(&rain->write_lock); + return err; +} + +static int rain_setup(struct rain *rain, struct serio *serio, + struct cec_log_addrs *log_addrs, u16 *pa) +{ + u16 res; + int err; + + err = rain_send_and_wait(rain, "R", "REV"); + if (err) + return err; + dev_info(rain->dev, "Firmware version %s\n", rain->data + 4); + + err = rain_send_and_wait(rain, "Q 1", "QTY"); + if (err) + return err; + err = rain_send_and_wait(rain, "c0000", "CFG"); + if (err) + return err; + return rain_send_and_wait(rain, "A F 0000", "ADR"); +} + +static int rain_cec_adap_enable(struct cec_adapter *adap, bool enable) +{ + return 0; +} + +static int rain_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr) +{ + struct rain *rain = adap->priv; + u8 cmd[16]; + + if (log_addr == CEC_LOG_ADDR_INVALID) + log_addr = CEC_LOG_ADDR_UNREGISTERED; + snprintf(cmd, sizeof(cmd), "A %x", log_addr); + return rain_send_and_wait(rain, cmd, "ADR"); +} + +static int rain_cec_adap_transmit(struct cec_adapter *adap, u8 attempts, + u32 signal_free_time, struct cec_msg *msg) +{ + struct rain *rain = adap->priv; + char cmd[2 * CEC_MAX_MSG_SIZE + 16]; + unsigned int i; + int err; + + if (msg->len == 1) { + snprintf(cmd, sizeof(cmd), "x%x", cec_msg_destination(msg)); + } else { + char hex[3]; + + snprintf(cmd, sizeof(cmd), "x%x %02x ", + cec_msg_destination(msg), msg->msg[1]); + for (i = 2; i < msg->len; i++) { + snprintf(hex, sizeof(hex), "%02x", msg->msg[i]); + strncat(cmd, hex, sizeof(cmd)); + } + } + mutex_lock(&rain->write_lock); + err = rain_send(rain, cmd); + mutex_unlock(&rain->write_lock); + return err; +} + +static const struct cec_adap_ops rain_cec_adap_ops = { + .adap_enable = rain_cec_adap_enable, + .adap_log_addr = rain_cec_adap_log_addr, + .adap_transmit = rain_cec_adap_transmit, +}; + +static int rain_connect(struct serio *serio, struct serio_driver *drv) +{ + u32 caps = CEC_CAP_TRANSMIT | CEC_CAP_LOG_ADDRS | CEC_CAP_PHYS_ADDR | + CEC_CAP_PASSTHROUGH | CEC_CAP_RC | CEC_CAP_MONITOR_ALL; + struct rain *rain; + int err = -ENOMEM; + struct cec_log_addrs log_addrs = {}; + u16 pa = CEC_PHYS_ADDR_INVALID; + + rain = kzalloc(sizeof(*rain), GFP_KERNEL); + + if (!rain) + return -ENOMEM; + + rain->serio = serio; + rain->adap = cec_allocate_adapter(&rain_cec_adap_ops, rain, + "HDMI CEC", caps, 1); + err = PTR_ERR_OR_ZERO(rain->adap); + if (err < 0) + goto free_device; + + rain->dev = &serio->dev; + serio_set_drvdata(serio, rain); + INIT_WORK(&rain->work, rain_irq_work_handler); + mutex_init(&rain->write_lock); + + err = serio_open(serio, drv); + if (err) + goto delete_adap; + + err = rain_setup(rain, serio, &log_addrs, &pa); + if (err) + goto close_serio; + + err = cec_register_adapter(rain->adap, &serio->dev); + if (err < 0) + goto close_serio; + + rain->dev = &rain->adap->devnode.dev; + return 0; + +close_serio: + serio_close(serio); +delete_adap: + cec_delete_adapter(rain->adap); + serio_set_drvdata(serio, NULL); +free_device: + kfree(rain); + return err; +} + +static struct serio_device_id rain_serio_ids[] = { + { + .type = SERIO_RS232, + .proto = SERIO_RAINSHADOW_CEC, + .id = SERIO_ANY, + .extra = SERIO_ANY, + }, + { 0 } +}; + +MODULE_DEVICE_TABLE(serio, rain_serio_ids); + +static struct serio_driver rain_drv = { + .driver = { + .name = "rainshadow-cec", + }, + .description = "RainShadow Tech HDMI CEC driver", + .id_table = rain_serio_ids, + .interrupt = rain_interrupt, + .connect = rain_connect, + .disconnect = rain_disconnect, +}; + +module_serio_driver(rain_drv); -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
