Commit 3dff3106 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] pulse8-cec: new driver for the Pulse-Eight USB-CEC Adapter 



This supports the Pulse-Eight USB-CEC Adapter.

It has been tested with firmware versions 4 and 5, but it should
hopefully work fine with older firmwares as well.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent c624b5de

drivers/staging/media/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -29,6 +29,8 @@ source "drivers/staging/media/davinci_vpfe/Kconfig" 


source "drivers/staging/media/omap4iss/Kconfig"



source "drivers/staging/media/pulse8-cec/Kconfig"



source "drivers/staging/media/tw686x-kh/Kconfig"



source "drivers/staging/media/s5p-cec/Kconfig"

drivers/staging/media/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,4 +5,5 @@ obj-$(CONFIG_DVB_CXD2099) += cxd2099/ 
obj-$(CONFIG_LIRC_STAGING)	+= lirc/

obj-$(CONFIG_VIDEO_DM365_VPFE)	+= davinci_vpfe/

obj-$(CONFIG_VIDEO_OMAP4)	+= omap4iss/

obj-$(CONFIG_USB_PULSE8_CEC)    += pulse8-cec/

obj-$(CONFIG_VIDEO_TW686X_KH)	+= tw686x-kh/

drivers/staging/media/pulse8-cec/Kconfig

0 → 100644
+10 −0
Original line number Diff line number Diff line 
config USB_PULSE8_CEC

	tristate "Pulse Eight HDMI CEC"

	depends on USB_ACM && MEDIA_CEC

	select SERIO

	select SERIO_SERPORT

	---help---

	  This is a cec driver for the Pulse Eight HDMI CEC device.



	  To compile this driver as a module, choose M here: the

	  module will be called pulse8-cec.

drivers/staging/media/pulse8-cec/Makefile

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+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_USB_PULSE8_CEC) += pulse8-cec.o

drivers/staging/media/pulse8-cec/pulse8-cec.c

0 → 100644
+505 −0
Original line number Diff line number Diff line 
/*

 * Pulse Eight HDMI CEC driver

 *

 * Copyright 2016 Hans Verkuil <hverkuil@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.

 */



#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 <media/cec.h>



MODULE_AUTHOR("Hans Verkuil <hverkuil@xs4all.nl>");

MODULE_DESCRIPTION("Pulse Eight HDMI CEC driver");

MODULE_LICENSE("GPL");



static int debug;

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug, "debug level (0-1)");



enum pulse8_msgcodes {

	MSGCODE_NOTHING = 0,

	MSGCODE_PING,

	MSGCODE_TIMEOUT_ERROR,

	MSGCODE_HIGH_ERROR,

	MSGCODE_LOW_ERROR,

	MSGCODE_FRAME_START,

	MSGCODE_FRAME_DATA,

	MSGCODE_RECEIVE_FAILED,

	MSGCODE_COMMAND_ACCEPTED,	/* 0x08 */

	MSGCODE_COMMAND_REJECTED,

	MSGCODE_SET_ACK_MASK,

	MSGCODE_TRANSMIT,

	MSGCODE_TRANSMIT_EOM,

	MSGCODE_TRANSMIT_IDLETIME,

	MSGCODE_TRANSMIT_ACK_POLARITY,

	MSGCODE_TRANSMIT_LINE_TIMEOUT,

	MSGCODE_TRANSMIT_SUCCEEDED,	/* 0x10 */

	MSGCODE_TRANSMIT_FAILED_LINE,

	MSGCODE_TRANSMIT_FAILED_ACK,

	MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA,

	MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE,

	MSGCODE_FIRMWARE_VERSION,

	MSGCODE_START_BOOTLOADER,

	MSGCODE_GET_BUILDDATE,

	MSGCODE_SET_CONTROLLED,		/* 0x18 */

	MSGCODE_GET_AUTO_ENABLED,

	MSGCODE_SET_AUTO_ENABLED,

	MSGCODE_GET_DEFAULT_LOGICAL_ADDRESS,

	MSGCODE_SET_DEFAULT_LOGICAL_ADDRESS,

	MSGCODE_GET_LOGICAL_ADDRESS_MASK,

	MSGCODE_SET_LOGICAL_ADDRESS_MASK,

	MSGCODE_GET_PHYSICAL_ADDRESS,

	MSGCODE_SET_PHYSICAL_ADDRESS,	/* 0x20 */

	MSGCODE_GET_DEVICE_TYPE,

	MSGCODE_SET_DEVICE_TYPE,

	MSGCODE_GET_HDMI_VERSION,

	MSGCODE_SET_HDMI_VERSION,

	MSGCODE_GET_OSD_NAME,

	MSGCODE_SET_OSD_NAME,

	MSGCODE_WRITE_EEPROM,

	MSGCODE_GET_ADAPTER_TYPE,	/* 0x28 */

	MSGCODE_SET_ACTIVE_SOURCE,



	MSGCODE_FRAME_EOM = 0x80,

	MSGCODE_FRAME_ACK = 0x40,

};



#define MSGSTART	0xff

#define MSGEND		0xfe

#define MSGESC		0xfd

#define MSGOFFSET	3



#define DATA_SIZE 256



struct pulse8 {

	struct device *dev;

	struct serio *serio;

	struct cec_adapter *adap;

	struct completion cmd_done;

	struct work_struct work;

	struct cec_msg rx_msg;

	u8 data[DATA_SIZE];

	unsigned int len;

	u8 buf[DATA_SIZE];

	unsigned int idx;

	bool escape;

	bool started;

};



void pulse8_irq_work_handler(struct work_struct *work)

{

	struct pulse8 *pulse8 =

		container_of(work, struct pulse8, work);



	switch (pulse8->data[0] & 0x3f) {

	case MSGCODE_FRAME_DATA:

		cec_received_msg(pulse8->adap, &pulse8->rx_msg);

		break;

	case MSGCODE_TRANSMIT_SUCCEEDED:

		cec_transmit_done(pulse8->adap, CEC_TX_STATUS_OK,

				  0, 0, 0, 0);

		break;

	case MSGCODE_TRANSMIT_FAILED_LINE:

		cec_transmit_done(pulse8->adap, CEC_TX_STATUS_ARB_LOST,

				  1, 0, 0, 0);

		break;

	case MSGCODE_TRANSMIT_FAILED_ACK:

		cec_transmit_done(pulse8->adap, CEC_TX_STATUS_NACK,

				  0, 1, 0, 0);

		break;

	case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:

	case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:

		cec_transmit_done(pulse8->adap, CEC_TX_STATUS_ERROR,

				  0, 0, 0, 1);

		break;

	}

}



static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data,

				    unsigned int flags)

{

	struct pulse8 *pulse8 = serio_get_drvdata(serio);



	if (!pulse8->started && data != MSGSTART)

		return IRQ_HANDLED;

	if (data == MSGESC) {

		pulse8->escape = true;

		return IRQ_HANDLED;

	}

	if (pulse8->escape) {

		data += MSGOFFSET;

		pulse8->escape = false;

	} else if (data == MSGEND) {

		struct cec_msg *msg = &pulse8->rx_msg;



		if (debug)

			dev_info(pulse8->dev, "received: %*ph\n",

				 pulse8->idx, pulse8->buf);

		pulse8->data[0] = pulse8->buf[0];

		switch (pulse8->buf[0] & 0x3f) {

		case MSGCODE_FRAME_START:

			msg->len = 1;

			msg->msg[0] = pulse8->buf[1];

			break;

		case MSGCODE_FRAME_DATA:

			if (msg->len == CEC_MAX_MSG_SIZE)

				break;

			msg->msg[msg->len++] = pulse8->buf[1];

			if (pulse8->buf[0] & MSGCODE_FRAME_EOM)

				schedule_work(&pulse8->work);

			break;

		case MSGCODE_TRANSMIT_SUCCEEDED:

		case MSGCODE_TRANSMIT_FAILED_LINE:

		case MSGCODE_TRANSMIT_FAILED_ACK:

		case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:

		case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:

			schedule_work(&pulse8->work);

			break;

		case MSGCODE_TIMEOUT_ERROR:

			break;

		case MSGCODE_COMMAND_ACCEPTED:

		case MSGCODE_COMMAND_REJECTED:

		default:

			if (pulse8->idx == 0)

				break;

			memcpy(pulse8->data, pulse8->buf, pulse8->idx);

			pulse8->len = pulse8->idx;

			complete(&pulse8->cmd_done);

			break;

		}

		pulse8->idx = 0;

		pulse8->started = false;

		return IRQ_HANDLED;

	} else if (data == MSGSTART) {

		pulse8->idx = 0;

		pulse8->started = true;

		return IRQ_HANDLED;

	}



	if (pulse8->idx >= DATA_SIZE) {

		dev_dbg(pulse8->dev,

			"throwing away %d bytes of garbage\n", pulse8->idx);

		pulse8->idx = 0;

	}

	pulse8->buf[pulse8->idx++] = data;

	return IRQ_HANDLED;

}



static void pulse8_disconnect(struct serio *serio)

{

	struct pulse8 *pulse8 = serio_get_drvdata(serio);



	cec_unregister_adapter(pulse8->adap);

	dev_info(&serio->dev, "disconnected\n");

	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	kfree(pulse8);

}



static int pulse8_send(struct serio *serio, const u8 *command, u8 cmd_len)

{

	int err = 0;



	err = serio_write(serio, MSGSTART);

	if (err)

		return err;

	for (; !err && cmd_len; command++, cmd_len--) {

		if (*command >= MSGESC) {

			err = serio_write(serio, MSGESC);

			if (!err)

				err = serio_write(serio, *command - MSGOFFSET);

		} else {

			err = serio_write(serio, *command);

		}

	}

	if (!err)

		err = serio_write(serio, 0xfe);



	return err;

}



static int pulse8_send_and_wait(struct pulse8 *pulse8,

				const u8 *cmd, u8 cmd_len, u8 response, u8 size)

{

	int err;



	/*dev_info(pulse8->dev, "transmit: %*ph\n", cmd_len, cmd);*/

	init_completion(&pulse8->cmd_done);



	err = pulse8_send(pulse8->serio, cmd, cmd_len);

	if (err)

		return err;



	if (!wait_for_completion_timeout(&pulse8->cmd_done, HZ))

		return -ETIMEDOUT;

	if ((pulse8->data[0] & 0x3f) == MSGCODE_COMMAND_REJECTED &&

	    cmd[0] != MSGCODE_SET_CONTROLLED &&

	    cmd[0] != MSGCODE_SET_AUTO_ENABLED &&

	    cmd[0] != MSGCODE_GET_BUILDDATE) {

		u8 cmd_sc[2];



		cmd_sc[0] = MSGCODE_SET_CONTROLLED;

		cmd_sc[1] = 1;

		err = pulse8_send_and_wait(pulse8, cmd_sc, 2,

					   MSGCODE_COMMAND_ACCEPTED, 1);

		if (err)

			return err;

		init_completion(&pulse8->cmd_done);



		err = pulse8_send(pulse8->serio, cmd, cmd_len);

		if (err)

			return err;



		if (!wait_for_completion_timeout(&pulse8->cmd_done, HZ))

			return -ETIMEDOUT;

	}

	if (response &&

	    ((pulse8->data[0] & 0x3f) != response || pulse8->len < size + 1)) {

		dev_info(pulse8->dev, "transmit: failed %02x\n",

			 pulse8->data[0] & 0x3f);

		return -EIO;

	}

	return 0;

}



static int pulse8_setup(struct pulse8 *pulse8, struct serio *serio)

{

	u8 *data = pulse8->data + 1;

	unsigned int count = 0;

	unsigned int vers = 0;

	u8 cmd[2];

	int err;



	cmd[0] = MSGCODE_PING;

	err = pulse8_send_and_wait(pulse8, cmd, 1,

				   MSGCODE_COMMAND_ACCEPTED, 0);

	cmd[0] = MSGCODE_FIRMWARE_VERSION;

	if (!err)

		err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 2);

	if (err)

		return err;



	vers = (data[0] << 8) | data[1];



	dev_info(pulse8->dev, "Firmware version %04x\n", vers);

	if (vers < 2)

		return 0;



	cmd[0] = MSGCODE_GET_BUILDDATE;

	if (!err)

		err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 4);

	if (!err) {

		time_t date = (data[0] << 24) | (data[1] << 16) |

			(data[2] << 8) | data[3];

		struct tm tm;



		time_to_tm(date, 0, &tm);



		dev_info(pulse8->dev, "Firmware build date %04ld.%02d.%02d %02d:%02d:%02d\n",

			 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,

			 tm.tm_hour, tm.tm_min, tm.tm_sec);

	}



	do {

		if (count)

			msleep(500);

		cmd[0] = MSGCODE_SET_AUTO_ENABLED;

		cmd[1] = 0;

		err = pulse8_send_and_wait(pulse8, cmd, 2,

					   MSGCODE_COMMAND_ACCEPTED, 1);

		if (err && count == 0) {

			dev_info(pulse8->dev, "No Auto Enabled supported\n");

			return 0;

		}



		cmd[0] = MSGCODE_GET_AUTO_ENABLED;

		if (!err)

			err = pulse8_send_and_wait(pulse8, cmd, 1, cmd[0], 1);

		if (!err && !data[0]) {

			cmd[0] = MSGCODE_WRITE_EEPROM;

			err = pulse8_send_and_wait(pulse8, cmd, 1,

						   MSGCODE_COMMAND_ACCEPTED, 1);

			cmd[0] = MSGCODE_GET_AUTO_ENABLED;

			if (!err)

				err = pulse8_send_and_wait(pulse8, cmd, 1,

							   cmd[0], 1);

		}

	} while (!err && data[0] && count++ < 5);



	if (!err && data[0])

		err = -EIO;



	return err;

}



static int pulse8_cec_adap_enable(struct cec_adapter *adap, bool enable)

{

	struct pulse8 *pulse8 = adap->priv;

	u8 cmd[16];

	int err;



	cmd[0] = MSGCODE_SET_CONTROLLED;

	cmd[1] = enable;

	err = pulse8_send_and_wait(pulse8, cmd, 2,

				   MSGCODE_COMMAND_ACCEPTED, 1);

	return enable ? err : 0;

}



static int pulse8_cec_adap_log_addr(struct cec_adapter *adap, u8 log_addr)

{

	struct pulse8 *pulse8 = adap->priv;

	u16 mask = 0;

	u8 cmd[3];

	int err;



	if (log_addr != CEC_LOG_ADDR_INVALID)

		mask = 1 << log_addr;

	cmd[0] = MSGCODE_SET_ACK_MASK;

	cmd[1] = mask >> 8;

	cmd[2] = mask & 0xff;

	err = pulse8_send_and_wait(pulse8, cmd, 3,

				   MSGCODE_COMMAND_ACCEPTED, 0);

	if (mask == 0)

		return 0;

	return err;

}



static int pulse8_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,

				    u32 signal_free_time, struct cec_msg *msg)

{

	struct pulse8 *pulse8 = adap->priv;

	u8 cmd[2];

	unsigned int i;

	int err;



	cmd[0] = MSGCODE_TRANSMIT_IDLETIME;

	cmd[1] = 3;

	err = pulse8_send_and_wait(pulse8, cmd, 2,

				   MSGCODE_COMMAND_ACCEPTED, 1);

	cmd[0] = MSGCODE_TRANSMIT_ACK_POLARITY;

	cmd[1] = cec_msg_is_broadcast(msg);

	if (!err)

		err = pulse8_send_and_wait(pulse8, cmd, 2,

					   MSGCODE_COMMAND_ACCEPTED, 1);

	cmd[0] = msg->len == 1 ? MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;

	cmd[1] = msg->msg[0];

	if (!err)

		err = pulse8_send_and_wait(pulse8, cmd, 2,

					   MSGCODE_COMMAND_ACCEPTED, 1);

	if (!err && msg->len > 1) {

		cmd[0] = msg->len == 2 ? MSGCODE_TRANSMIT_EOM :

					 MSGCODE_TRANSMIT;

		cmd[1] = msg->msg[1];

		err = pulse8_send_and_wait(pulse8, cmd, 2,

					   MSGCODE_COMMAND_ACCEPTED, 1);

		for (i = 0; !err && i + 2 < msg->len; i++) {

			cmd[0] = (i + 2 == msg->len - 1) ?

				MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;

			cmd[1] = msg->msg[i + 2];

			err = pulse8_send_and_wait(pulse8, cmd, 2,

						   MSGCODE_COMMAND_ACCEPTED, 1);

		}

	}



	return err;

}



static int pulse8_received(struct cec_adapter *adap, struct cec_msg *msg)

{

	return -ENOMSG;

}



const struct cec_adap_ops pulse8_cec_adap_ops = {

	.adap_enable = pulse8_cec_adap_enable,

	.adap_log_addr = pulse8_cec_adap_log_addr,

	.adap_transmit = pulse8_cec_adap_transmit,

	.received = pulse8_received,

};



static int pulse8_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 pulse8 *pulse8;

	int err = -ENOMEM;



	pulse8 = kzalloc(sizeof(*pulse8), GFP_KERNEL);



	if (!pulse8)

		return -ENOMEM;



	pulse8->serio = serio;

	pulse8->adap = cec_allocate_adapter(&pulse8_cec_adap_ops, pulse8,

		"HDMI CEC", caps, 1, &serio->dev);

	err = PTR_ERR_OR_ZERO(pulse8->adap);

	if (err < 0)

		goto free_device;



	pulse8->dev = &serio->dev;

	serio_set_drvdata(serio, pulse8);

	INIT_WORK(&pulse8->work, pulse8_irq_work_handler);



	err = serio_open(serio, drv);

	if (err)

		goto delete_adap;



	err = pulse8_setup(pulse8, serio);

	if (err)

		goto close_serio;



	err = cec_register_adapter(pulse8->adap);

	if (err < 0)

		goto close_serio;



	pulse8->dev = &pulse8->adap->devnode.dev;

	return 0;



close_serio:

	serio_close(serio);

delete_adap:

	cec_delete_adapter(pulse8->adap);

	serio_set_drvdata(serio, NULL);

free_device:

	kfree(pulse8);

	return err;

}



static struct serio_device_id pulse8_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_PULSE8_CEC,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};



MODULE_DEVICE_TABLE(serio, pulse8_serio_ids);



static struct serio_driver pulse8_drv = {

	.driver		= {

		.name	= "pulse8-cec",

	},

	.description	= "Pulse Eight HDMI CEC driver",

	.id_table	= pulse8_serio_ids,

	.interrupt	= pulse8_interrupt,

	.connect	= pulse8_connect,

	.disconnect	= pulse8_disconnect,

};



module_serio_driver(pulse8_drv);

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