- 根目录:
- drivers
- media
- usb
- em28xx
- em28xx-input.c
/*
handle em28xx IR remotes via linux kernel input layer.
Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
Markus Rechberger <mrechberger@gmail.com>
Mauro Carvalho Chehab <mchehab@infradead.org>
Sascha Sommer <saschasommer@freenet.de>
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include "em28xx.h"
#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
#define EM28XX_SBUTTON_QUERY_INTERVAL 500
#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
static unsigned int ir_debug;
module_param(ir_debug, int, 0644);
MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
#define MODULE_NAME "em28xx"
#define dprintk(fmt, arg...) \
if (ir_debug) { \
printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
}
/**********************************************************
Polling structure used by em28xx IR's
**********************************************************/
struct em28xx_ir_poll_result {
unsigned int toggle_bit:1;
unsigned int read_count:7;
u32 scancode;
};
struct em28xx_IR {
struct em28xx *dev;
struct rc_dev *rc;
char name[32];
char phys[32];
/* poll decoder */
int polling;
struct delayed_work work;
unsigned int full_code:1;
unsigned int last_readcount;
u64 rc_type;
/* i2c slave address of external device (if used) */
u16 i2c_dev_addr;
int (*get_key_i2c)(struct i2c_client *, u32 *);
int (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
};
/**********************************************************
I2C IR based get keycodes - should be used with ir-kbd-i2c
**********************************************************/
static int em28xx_get_key_terratec(struct i2c_client *i2c_dev, u32 *ir_key)
{
unsigned char b;
/* poll IR chip */
if (1 != i2c_master_recv(i2c_dev, &b, 1))
return -EIO;
/* it seems that 0xFE indicates that a button is still hold
down, while 0xff indicates that no button is hold down. */
if (b == 0xff)
return 0;
if (b == 0xfe)
/* keep old data */
return 1;
*ir_key = b;
return 1;
}
static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev, u32 *ir_key)
{
unsigned char buf[2];
u16 code;
int size;
/* poll IR chip */
size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
if (size != 2)
return -EIO;
/* Does eliminate repeated parity code */
if (buf[1] == 0xff)
return 0;
/*
* Rearranges bits to the right order.
* The bit order were determined experimentally by using
* The original Hauppauge Grey IR and another RC5 that uses addr=0x08
* The RC5 code has 14 bits, but we've experimentally determined
* the meaning for only 11 bits.
* So, the code translation is not complete. Yet, it is enough to
* work with the provided RC5 IR.
*/
code =
((buf[0] & 0x01) ? 0x0020 : 0) | /* 0010 0000 */
((buf[0] & 0x02) ? 0x0010 : 0) | /* 0001 0000 */
((buf[0] & 0x04) ? 0x0008 : 0) | /* 0000 1000 */
((buf[0] & 0x08) ? 0x0004 : 0) | /* 0000 0100 */
((buf[0] & 0x10) ? 0x0002 : 0) | /* 0000 0010 */
((buf[0] & 0x20) ? 0x0001 : 0) | /* 0000 0001 */
((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000 */
((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000 */
((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100 */
((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010 */
((buf[1] & 0x80) ? 0x0100 : 0); /* 0000 0001 */
/* return key */
*ir_key = code;
return 1;
}
static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
u32 *ir_key)
{
unsigned char buf[3];
/* poll IR chip */
if (3 != i2c_master_recv(i2c_dev, buf, 3))
return -EIO;
if (buf[0] != 0x00)
return 0;
*ir_key = buf[2]&0x3f;
return 1;
}
static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
u32 *ir_key)
{
unsigned char subaddr, keydetect, key;
struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
{ .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
subaddr = 0x10;
if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
return -EIO;
if (keydetect == 0x00)
return 0;
subaddr = 0x00;
msg[1].buf = &key;
if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
return -EIO;
if (key == 0x00)
return 0;
*ir_key = key;
return 1;
}
/**********************************************************
Poll based get keycode functions
**********************************************************/
/* This is for the em2860/em2880 */
static int default_polling_getkey(struct em28xx_IR *ir,
struct em28xx_ir_poll_result *poll_result)
{
struct em28xx *dev = ir->dev;
int rc;
u8 msg[3] = { 0, 0, 0 };
/* Read key toggle, brand, and key code
on registers 0x45, 0x46 and 0x47
*/
rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
msg, sizeof(msg));
if (rc < 0)
return rc;
/* Infrared toggle (Reg 0x45[7]) */
poll_result->toggle_bit = (msg[0] >> 7);
/* Infrared read count (Reg 0x45[6:0] */
poll_result->read_count = (msg[0] & 0x7f);
/* Remote Control Address/Data (Regs 0x46/0x47) */
poll_result->scancode = msg[1] << 8 | msg[2];
return 0;
}
static int em2874_polling_getkey(struct em28xx_IR *ir,
struct em28xx_ir_poll_result *poll_result)
{
struct em28xx *dev = ir->dev;
int rc;
u8 msg[5] = { 0, 0, 0, 0, 0 };
/* Read key toggle, brand, and key code
on registers 0x51-55
*/
rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
msg, sizeof(msg));
if (rc < 0)
return rc;
/* Infrared toggle (Reg 0x51[7]) */
poll_result->toggle_bit = (msg[0] >> 7);
/* Infrared read count (Reg 0x51[6:0] */
poll_result->read_count = (msg[0] & 0x7f);
/*
* Remote Control Address (Reg 0x52)
* Remote Control Data (Reg 0x53-0x55)
*/
switch (ir->rc_type) {
case RC_BIT_RC5:
poll_result->scancode = msg[1] << 8 | msg[2];
break;
case RC_BIT_NEC:
if ((msg[3] ^ msg[4]) != 0xff) /* 32 bits NEC */
poll_result->scancode = (msg[1] << 24) |
(msg[2] << 16) |
(msg[3] << 8) |
msg[4];
else if ((msg[1] ^ msg[2]) != 0xff) /* 24 bits NEC */
poll_result->scancode = (msg[1] << 16) |
(msg[2] << 8) |
msg[3];
else /* Normal NEC */
poll_result->scancode = msg[1] << 8 | msg[3];
break;
case RC_BIT_RC6_0:
poll_result->scancode = msg[1] << 8 | msg[2];
break;
default:
poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
(msg[3] << 8) | msg[4];
break;
}
return 0;
}
/**********************************************************
Polling code for em28xx
**********************************************************/
static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
{
struct em28xx *dev = ir->dev;
static u32 ir_key;
int rc;
struct i2c_client client;
client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
client.addr = ir->i2c_dev_addr;
rc = ir->get_key_i2c(&client, &ir_key);
if (rc < 0) {
dprintk("ir->get_key_i2c() failed: %d\n", rc);
return rc;
}
if (rc) {
dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
rc_keydown(ir->rc, ir_key, 0);
}
return 0;
}
static void em28xx_ir_handle_key(struct em28xx_IR *ir)
{
int result;
struct em28xx_ir_poll_result poll_result;
/* read the registers containing the IR status */
result = ir->get_key(ir, &poll_result);
if (unlikely(result < 0)) {
dprintk("ir->get_key() failed: %d\n", result);
return;
}
if (unlikely(poll_result.read_count != ir->last_readcount)) {
dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
poll_result.toggle_bit, poll_result.read_count,
poll_result.scancode);
if (ir->full_code)
rc_keydown(ir->rc,
poll_result.scancode,
poll_result.toggle_bit);
else
rc_keydown(ir->rc,
poll_result.scancode & 0xff,
poll_result.toggle_bit);
if (ir->dev->chip_id == CHIP_ID_EM2874 ||
ir->dev->chip_id == CHIP_ID_EM2884)
/* The em2874 clears the readcount field every time the
register is read. The em2860/2880 datasheet says that it
is supposed to clear the readcount, but it doesn't. So with
the em2874, we are looking for a non-zero read count as
opposed to a readcount that is incrementing */
ir->last_readcount = 0;
else
ir->last_readcount = poll_result.read_count;
}
}
static void em28xx_ir_work(struct work_struct *work)
{
struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
if (ir->i2c_dev_addr) /* external i2c device */
em28xx_i2c_ir_handle_key(ir);
else /* internal device */
em28xx_ir_handle_key(ir);
schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
}
static int em28xx_ir_start(struct rc_dev *rc)
{
struct em28xx_IR *ir = rc->priv;
INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
schedule_delayed_work(&ir->work, 0);
return 0;
}
static void em28xx_ir_stop(struct rc_dev *rc)
{
struct em28xx_IR *ir = rc->priv;
cancel_delayed_work_sync(&ir->work);
}
static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
{
struct em28xx_IR *ir = rc_dev->priv;
struct em28xx *dev = ir->dev;
/* Adjust xclk based on IR table for RC5/NEC tables */
if (*rc_type & RC_BIT_RC5) {
dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
ir->full_code = 1;
*rc_type = RC_BIT_RC5;
} else if (*rc_type & RC_BIT_NEC) {
dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
ir->full_code = 1;
*rc_type = RC_BIT_NEC;
} else if (*rc_type & RC_BIT_UNKNOWN) {
*rc_type = RC_BIT_UNKNOWN;
} else {
*rc_type = ir->rc_type;
return -EINVAL;
}
em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
EM28XX_XCLK_IR_RC5_MODE);
ir->rc_type = *rc_type;
return 0;
}
static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
{
struct em28xx_IR *ir = rc_dev->priv;
struct em28xx *dev = ir->dev;
u8 ir_config = EM2874_IR_RC5;
/* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
if (*rc_type & RC_BIT_RC5) {
dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
ir->full_code = 1;
*rc_type = RC_BIT_RC5;
} else if (*rc_type & RC_BIT_NEC) {
dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
ir->full_code = 1;
*rc_type = RC_BIT_NEC;
} else if (*rc_type & RC_BIT_RC6_0) {
dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
ir_config = EM2874_IR_RC6_MODE_0;
ir->full_code = 1;
*rc_type = RC_BIT_RC6_0;
} else if (*rc_type & RC_BIT_UNKNOWN) {
*rc_type = RC_BIT_UNKNOWN;
} else {
*rc_type = ir->rc_type;
return -EINVAL;
}
em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
EM28XX_XCLK_IR_RC5_MODE);
ir->rc_type = *rc_type;
return 0;
}
static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
{
struct em28xx_IR *ir = rc_dev->priv;
struct em28xx *dev = ir->dev;
/* Setup the proper handler based on the chip */
switch (dev->chip_id) {
case CHIP_ID_EM2860:
case CHIP_ID_EM2883:
return em2860_ir_change_protocol(rc_dev, rc_type);
case CHIP_ID_EM2884:
case CHIP_ID_EM2874:
case CHIP_ID_EM28174:
return em2874_ir_change_protocol(rc_dev, rc_type);
default:
printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
dev->chip_id);
return -EINVAL;
}
}
static int em28xx_probe_i2c_ir(struct em28xx *dev)
{
int i = 0;
/* Leadtek winfast tv USBII deluxe can find a non working IR-device */
/* at address 0x18, so if that address is needed for another board in */
/* the future, please put it after 0x1f. */
const unsigned short addr_list[] = {
0x1f, 0x30, 0x47, I2C_CLIENT_END
};
while (addr_list[i] != I2C_CLIENT_END) {
if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
return addr_list[i];
i++;
}
return -ENODEV;
}
/**********************************************************
Handle Webcam snapshot button
**********************************************************/
static void em28xx_query_sbutton(struct work_struct *work)
{
/* Poll the register and see if the button is depressed */
struct em28xx *dev =
container_of(work, struct em28xx, sbutton_query_work.work);
int ret;
ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
u8 cleared;
/* Button is depressed, clear the register */
cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
/* Not emulate the keypress */
input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
1);
/* Now unpress the key */
input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
0);
}
/* Schedule next poll */
schedule_delayed_work(&dev->sbutton_query_work,
msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
}
static void em28xx_register_snapshot_button(struct em28xx *dev)
{
struct input_dev *input_dev;
int err;
em28xx_info("Registering snapshot button...\n");
input_dev = input_allocate_device();
if (!input_dev) {
em28xx_errdev("input_allocate_device failed\n");
return;
}
usb_make_path(dev->udev, dev->snapshot_button_path,
sizeof(dev->snapshot_button_path));
strlcat(dev->snapshot_button_path, "/sbutton",
sizeof(dev->snapshot_button_path));
INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
input_dev->name = "em28xx snapshot button";
input_dev->phys = dev->snapshot_button_path;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
input_dev->keycodesize = 0;
input_dev->keycodemax = 0;
input_dev->id.bustype = BUS_USB;
input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
input_dev->id.version = 1;
input_dev->dev.parent = &dev->udev->dev;
err = input_register_device(input_dev);
if (err) {
em28xx_errdev("input_register_device failed\n");
input_free_device(input_dev);
return;
}
dev->sbutton_input_dev = input_dev;
schedule_delayed_work(&dev->sbutton_query_work,
msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
return;
}
static void em28xx_deregister_snapshot_button(struct em28xx *dev)
{
if (dev->sbutton_input_dev != NULL) {
em28xx_info("Deregistering snapshot button\n");
cancel_delayed_work_sync(&dev->sbutton_query_work);
input_unregister_device(dev->sbutton_input_dev);
dev->sbutton_input_dev = NULL;
}
return;
}
static int em28xx_ir_init(struct em28xx *dev)
{
struct em28xx_IR *ir;
struct rc_dev *rc;
int err = -ENOMEM;
u64 rc_type;
u16 i2c_rc_dev_addr = 0;
if (dev->board.has_snapshot_button)
em28xx_register_snapshot_button(dev);
if (dev->board.has_ir_i2c) {
i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
if (!i2c_rc_dev_addr) {
dev->board.has_ir_i2c = 0;
em28xx_warn("No i2c IR remote control device found.\n");
return -ENODEV;
}
}
if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
/* No remote control support */
em28xx_warn("Remote control support is not available for "
"this card.\n");
return 0;
}
ir = kzalloc(sizeof(*ir), GFP_KERNEL);
rc = rc_allocate_device();
if (!ir || !rc)
goto error;
/* record handles to ourself */
ir->dev = dev;
dev->ir = ir;
ir->rc = rc;
rc->priv = ir;
rc->open = em28xx_ir_start;
rc->close = em28xx_ir_stop;
if (dev->board.has_ir_i2c) { /* external i2c device */
switch (dev->model) {
case EM2800_BOARD_TERRATEC_CINERGY_200:
case EM2820_BOARD_TERRATEC_CINERGY_250:
rc->map_name = RC_MAP_EM_TERRATEC;
ir->get_key_i2c = em28xx_get_key_terratec;
break;
case EM2820_BOARD_PINNACLE_USB_2:
rc->map_name = RC_MAP_PINNACLE_GREY;
ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
break;
case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
rc->map_name = RC_MAP_HAUPPAUGE;
ir->get_key_i2c = em28xx_get_key_em_haup;
rc->allowed_protos = RC_BIT_RC5;
break;
case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
break;
default:
err = -ENODEV;
goto error;
}
ir->i2c_dev_addr = i2c_rc_dev_addr;
} else { /* internal device */
switch (dev->chip_id) {
case CHIP_ID_EM2860:
case CHIP_ID_EM2883:
rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
ir->get_key = default_polling_getkey;
break;
case CHIP_ID_EM2884:
case CHIP_ID_EM2874:
case CHIP_ID_EM28174:
ir->get_key = em2874_polling_getkey;
rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
RC_BIT_RC6_0;
break;
default:
err = -ENODEV;
goto error;
}
rc->change_protocol = em28xx_ir_change_protocol;
rc->map_name = dev->board.ir_codes;
/* By default, keep protocol field untouched */
rc_type = RC_BIT_UNKNOWN;
err = em28xx_ir_change_protocol(rc, &rc_type);
if (err)
goto error;
}
/* This is how often we ask the chip for IR information */
ir->polling = 100; /* ms */
/* init input device */
snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
strlcat(ir->phys, "/input0", sizeof(ir->phys));
rc->input_name = ir->name;
rc->input_phys = ir->phys;
rc->input_id.bustype = BUS_USB;
rc->input_id.version = 1;
rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
rc->dev.parent = &dev->udev->dev;
rc->driver_name = MODULE_NAME;
/* all done */
err = rc_register_device(rc);
if (err)
goto error;
return 0;
error:
dev->ir = NULL;
rc_free_device(rc);
kfree(ir);
return err;
}
static int em28xx_ir_fini(struct em28xx *dev)
{
struct em28xx_IR *ir = dev->ir;
em28xx_deregister_snapshot_button(dev);
/* skip detach on non attached boards */
if (!ir)
return 0;
if (ir->rc)
rc_unregister_device(ir->rc);
/* done */
kfree(ir);
dev->ir = NULL;
return 0;
}
static struct em28xx_ops rc_ops = {
.id = EM28XX_RC,
.name = "Em28xx Input Extension",
.init = em28xx_ir_init,
.fini = em28xx_ir_fini,
};
static int __init em28xx_rc_register(void)
{
return em28xx_register_extension(&rc_ops);
}
static void __exit em28xx_rc_unregister(void)
{
em28xx_unregister_extension(&rc_ops);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
MODULE_DESCRIPTION("Em28xx Input driver");
module_init(em28xx_rc_register);
module_exit(em28xx_rc_unregister);