ir-kbd-i2c.c
/*
*
* keyboard input driver for i2c IR remote controls
*
* Copyright (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org>
* modified for PixelView (BT878P+W/FM) by
* Michal Kochanowicz <mkochano@pld.org.pl>
* Christoph Bartelmus <lirc@bartelmus.de>
* modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
* Ulrich Mueller <ulrich.mueller42@web.de>
* modified for em2820 based USB TV tuners by
* Markus Rechberger <mrechberger@gmail.com>
* modified for DViCO Fusion HDTV 5 RT GOLD by
* Chaogui Zhang <czhang1974@gmail.com>
* modified for MSI TV@nywhere Plus by
* Henry Wong <henry@stuffedcow.net>
* Mark Schultz <n9xmj@yahoo.com>
* Brian Rogers <brian_rogers@comcast.net>
* modified for AVerMedia Cardbus by
* Oldrich Jedlicka <oldium.pro@seznam.cz>
*
* 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 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <asm/unaligned.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
#include <media/rc-core.h>
#include <media/i2c/ir-kbd-i2c.h>
/* ----------------------------------------------------------------------- */
/* insmod parameters */
static int debug;
module_param(debug, int, 0644); /* debug level (0,1,2) */
#define MODULE_NAME "ir-kbd-i2c"
#define dprintk(level, fmt, arg...) if (debug >= level) \
printk(KERN_DEBUG MODULE_NAME ": " fmt , ## arg)
/* ----------------------------------------------------------------------- */
static int get_key_haup_common(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *ptoggle, int size)
{
unsigned char buf[6];
int start, range, toggle, dev, code, ircode, vendor;
/* poll IR chip */
if (size != i2c_master_recv(ir->c, buf, size))
return -EIO;
if (buf[0] & 0x80) {
int offset = (size == 6) ? 3 : 0;
/* split rc5 data block ... */
start = (buf[offset] >> 7) & 1;
range = (buf[offset] >> 6) & 1;
toggle = (buf[offset] >> 5) & 1;
dev = buf[offset] & 0x1f;
code = (buf[offset+1] >> 2) & 0x3f;
/* rc5 has two start bits
* the first bit must be one
* the second bit defines the command range:
* 1 = 0-63, 0 = 64 - 127
*/
if (!start)
/* no key pressed */
return 0;
/* filter out invalid key presses */
ircode = (start << 12) | (toggle << 11) | (dev << 6) | code;
if ((ircode & 0x1fff) == 0x1fff)
return 0;
if (!range)
code += 64;
dprintk(1, "ir hauppauge (rc5): s%d r%d t%d dev=%d code=%d\n",
start, range, toggle, dev, code);
*protocol = RC_TYPE_RC5;
*scancode = RC_SCANCODE_RC5(dev, code);
*ptoggle = toggle;
return 1;
} else if (size == 6 && (buf[0] & 0x40)) {
code = buf[4];
dev = buf[3];
vendor = get_unaligned_be16(buf + 1);
if (vendor == 0x800f) {
*ptoggle = (dev & 0x80) != 0;
*protocol = RC_TYPE_RC6_MCE;
dev &= 0x7f;
dprintk(1, "ir hauppauge (rc6-mce): t%d vendor=%d dev=%d code=%d\n",
*ptoggle, vendor, dev, code);
} else {
*ptoggle = 0;
*protocol = RC_TYPE_RC6_6A_32;
dprintk(1, "ir hauppauge (rc6-6a-32): vendor=%d dev=%d code=%d\n",
vendor, dev, code);
}
*scancode = RC_SCANCODE_RC6_6A(vendor, dev, code);
return 1;
}
return 0;
}
static int get_key_haup(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
return get_key_haup_common(ir, protocol, scancode, toggle, 3);
}
static int get_key_haup_xvr(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
int ret;
unsigned char buf[1] = { 0 };
/*
* This is the same apparent "are you ready?" poll command observed
* watching Windows driver traffic and implemented in lirc_zilog. With
* this added, we get far saner remote behavior with z8 chips on usb
* connected devices, even with the default polling interval of 100ms.
*/
ret = i2c_master_send(ir->c, buf, 1);
if (ret != 1)
return (ret < 0) ? ret : -EINVAL;
return get_key_haup_common(ir, protocol, scancode, toggle, 6);
}
static int get_key_pixelview(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
unsigned char b;
/* poll IR chip */
if (1 != i2c_master_recv(ir->c, &b, 1)) {
dprintk(1,"read error\n");
return -EIO;
}
*protocol = RC_TYPE_OTHER;
*scancode = b;
*toggle = 0;
return 1;
}
static int get_key_fusionhdtv(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
unsigned char buf[4];
/* poll IR chip */
if (4 != i2c_master_recv(ir->c, buf, 4)) {
dprintk(1,"read error\n");
return -EIO;
}
if(buf[0] !=0 || buf[1] !=0 || buf[2] !=0 || buf[3] != 0)
dprintk(2, "%s: 0x%2x 0x%2x 0x%2x 0x%2x\n", __func__,
buf[0], buf[1], buf[2], buf[3]);
/* no key pressed or signal from other ir remote */
if(buf[0] != 0x1 || buf[1] != 0xfe)
return 0;
*protocol = RC_TYPE_UNKNOWN;
*scancode = buf[2];
*toggle = 0;
return 1;
}
static int get_key_knc1(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
unsigned char b;
/* poll IR chip */
if (1 != i2c_master_recv(ir->c, &b, 1)) {
dprintk(1,"read error\n");
return -EIO;
}
/* it seems that 0xFE indicates that a button is still hold
down, while 0xff indicates that no button is hold
down. 0xfe sequences are sometimes interrupted by 0xFF */
dprintk(2,"key %02x\n", b);
if (b == 0xff)
return 0;
if (b == 0xfe)
/* keep old data */
return 1;
*protocol = RC_TYPE_UNKNOWN;
*scancode = b;
*toggle = 0;
return 1;
}
static int get_key_avermedia_cardbus(struct IR_i2c *ir, enum rc_type *protocol,
u32 *scancode, u8 *toggle)
{
unsigned char subaddr, key, keygroup;
struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0,
.buf = &subaddr, .len = 1},
{ .addr = ir->c->addr, .flags = I2C_M_RD,
.buf = &key, .len = 1} };
subaddr = 0x0d;
if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
dprintk(1, "read error\n");
return -EIO;
}
if (key == 0xff)
return 0;
subaddr = 0x0b;
msg[1].buf = &keygroup;
if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
dprintk(1, "read error\n");
return -EIO;
}
if (keygroup == 0xff)
return 0;
dprintk(1, "read key 0x%02x/0x%02x\n", key, keygroup);
if (keygroup < 2 || keygroup > 4) {
/* Only a warning */
dprintk(1, "warning: invalid key group 0x%02x for key 0x%02x\n",
keygroup, key);
}
key |= (keygroup & 1) << 6;
*protocol = RC_TYPE_UNKNOWN;
*scancode = key;
if (ir->c->addr == 0x41) /* AVerMedia EM78P153 */
*scancode |= keygroup << 8;
*toggle = 0;
return 1;
}
/* ----------------------------------------------------------------------- */
static int ir_key_poll(struct IR_i2c *ir)
{
enum rc_type protocol;
u32 scancode;
u8 toggle;
int rc;
dprintk(3, "%s\n", __func__);
rc = ir->get_key(ir, &protocol, &scancode, &toggle);
if (rc < 0) {
dprintk(2,"error\n");
return rc;
}
if (rc) {
dprintk(1, "%s: proto = 0x%04x, scancode = 0x%08x\n",
__func__, protocol, scancode);
rc_keydown(ir->rc, protocol, scancode, toggle);
}
return 0;
}
static void ir_work(struct work_struct *work)
{
int rc;
struct IR_i2c *ir = container_of(work, struct IR_i2c, work.work);
rc = ir_key_poll(ir);
if (rc == -ENODEV) {
rc_unregister_device(ir->rc);
ir->rc = NULL;
return;
}
schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling_interval));
}
/* ----------------------------------------------------------------------- */
static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
char *ir_codes = NULL;
const char *name = NULL;
u64 rc_type = RC_BIT_UNKNOWN;
struct IR_i2c *ir;
struct rc_dev *rc = NULL;
struct i2c_adapter *adap = client->adapter;
unsigned short addr = client->addr;
int err;
ir = devm_kzalloc(&client->dev, sizeof(*ir), GFP_KERNEL);
if (!ir)
return -ENOMEM;
ir->c = client;
ir->polling_interval = DEFAULT_POLLING_INTERVAL;
i2c_set_clientdata(client, ir);
switch(addr) {
case 0x64:
name = "Pixelview";
ir->get_key = get_key_pixelview;
rc_type = RC_BIT_OTHER;
ir_codes = RC_MAP_EMPTY;
break;
case 0x18:
case 0x1f:
case 0x1a:
name = "Hauppauge";
ir->get_key = get_key_haup;
rc_type = RC_BIT_RC5;
ir_codes = RC_MAP_HAUPPAUGE;
break;
case 0x30:
name = "KNC One";
ir->get_key = get_key_knc1;
rc_type = RC_BIT_OTHER;
ir_codes = RC_MAP_EMPTY;
break;
case 0x6b:
name = "FusionHDTV";
ir->get_key = get_key_fusionhdtv;
rc_type = RC_BIT_UNKNOWN;
ir_codes = RC_MAP_FUSIONHDTV_MCE;
break;
case 0x40:
name = "AVerMedia Cardbus remote";
ir->get_key = get_key_avermedia_cardbus;
rc_type = RC_BIT_OTHER;
ir_codes = RC_MAP_AVERMEDIA_CARDBUS;
break;
case 0x41:
name = "AVerMedia EM78P153";
ir->get_key = get_key_avermedia_cardbus;
rc_type = RC_BIT_OTHER;
/* RM-KV remote, seems to be same as RM-K6 */
ir_codes = RC_MAP_AVERMEDIA_M733A_RM_K6;
break;
case 0x71:
name = "Hauppauge/Zilog Z8";
ir->get_key = get_key_haup_xvr;
rc_type = RC_BIT_RC5 | RC_BIT_RC6_MCE | RC_BIT_RC6_6A_32;
ir_codes = RC_MAP_HAUPPAUGE;
break;
}
/* Let the caller override settings */
if (client->dev.platform_data) {
const struct IR_i2c_init_data *init_data =
client->dev.platform_data;
ir_codes = init_data->ir_codes;
rc = init_data->rc_dev;
name = init_data->name;
if (init_data->type)
rc_type = init_data->type;
if (init_data->polling_interval)
ir->polling_interval = init_data->polling_interval;
switch (init_data->internal_get_key_func) {
case IR_KBD_GET_KEY_CUSTOM:
/* The bridge driver provided us its own function */
ir->get_key = init_data->get_key;
break;
case IR_KBD_GET_KEY_PIXELVIEW:
ir->get_key = get_key_pixelview;
break;
case IR_KBD_GET_KEY_HAUP:
ir->get_key = get_key_haup;
break;
case IR_KBD_GET_KEY_KNC1:
ir->get_key = get_key_knc1;
break;
case IR_KBD_GET_KEY_FUSIONHDTV:
ir->get_key = get_key_fusionhdtv;
break;
case IR_KBD_GET_KEY_HAUP_XVR:
ir->get_key = get_key_haup_xvr;
break;
case IR_KBD_GET_KEY_AVERMEDIA_CARDBUS:
ir->get_key = get_key_avermedia_cardbus;
break;
}
}
if (!rc) {
/*
* If platform_data doesn't specify rc_dev, initialize it
* internally
*/
rc = rc_allocate_device(RC_DRIVER_SCANCODE);
if (!rc)
return -ENOMEM;
}
ir->rc = rc;
/* Make sure we are all setup before going on */
if (!name || !ir->get_key || !rc_type || !ir_codes) {
dprintk(1, ": Unsupported device at address 0x%02x\n",
addr);
err = -ENODEV;
goto err_out_free;
}
/* Sets name */
snprintf(ir->name, sizeof(ir->name), "i2c IR (%s)", name);
ir->ir_codes = ir_codes;
snprintf(ir->phys, sizeof(ir->phys), "%s/%s/ir0",
dev_name(&adap->dev),
dev_name(&client->dev));
/*
* Initialize input_dev fields
* It doesn't make sense to allow overriding them via platform_data
*/
rc->input_id.bustype = BUS_I2C;
rc->input_phys = ir->phys;
rc->input_name = ir->name;
/*
* Initialize the other fields of rc_dev
*/
rc->map_name = ir->ir_codes;
rc->allowed_protocols = rc_type;
rc->enabled_protocols = rc_type;
if (!rc->driver_name)
rc->driver_name = MODULE_NAME;
err = rc_register_device(rc);
if (err)
goto err_out_free;
printk(MODULE_NAME ": %s detected at %s [%s]\n",
ir->name, ir->phys, adap->name);
/* start polling via eventd */
INIT_DELAYED_WORK(&ir->work, ir_work);
schedule_delayed_work(&ir->work, 0);
return 0;
err_out_free:
/* Only frees rc if it were allocated internally */
rc_free_device(rc);
return err;
}
static int ir_remove(struct i2c_client *client)
{
struct IR_i2c *ir = i2c_get_clientdata(client);
/* kill outstanding polls */
cancel_delayed_work_sync(&ir->work);
/* unregister device */
rc_unregister_device(ir->rc);
/* free memory */
return 0;
}
static const struct i2c_device_id ir_kbd_id[] = {
/* Generic entry for any IR receiver */
{ "ir_video", 0 },
/* IR device specific entries should be added here */
{ "ir_rx_z8f0811_haup", 0 },
{ "ir_rx_z8f0811_hdpvr", 0 },
{ }
};
static struct i2c_driver ir_kbd_driver = {
.driver = {
.name = "ir-kbd-i2c",
},
.probe = ir_probe,
.remove = ir_remove,
.id_table = ir_kbd_id,
};
module_i2c_driver(ir_kbd_driver);
/* ----------------------------------------------------------------------- */
MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
MODULE_DESCRIPTION("input driver for i2c IR remote controls");
MODULE_LICENSE("GPL");
