563 lines
14 KiB
C
563 lines
14 KiB
C
/*
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handle em28xx IR remotes via linux kernel input layer.
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Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
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Markus Rechberger <mrechberger@gmail.com>
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Mauro Carvalho Chehab <mchehab@infradead.org>
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Sascha Sommer <saschasommer@freenet.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include "em28xx.h"
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#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
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#define EM28XX_SBUTTON_QUERY_INTERVAL 500
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#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
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static unsigned int ir_debug;
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module_param(ir_debug, int, 0644);
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MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
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#define MODULE_NAME "em28xx"
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#define i2cdprintk(fmt, arg...) \
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if (ir_debug) { \
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printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
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}
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#define dprintk(fmt, arg...) \
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if (ir_debug) { \
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printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
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}
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/**********************************************************
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Polling structure used by em28xx IR's
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**********************************************************/
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struct em28xx_ir_poll_result {
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unsigned int toggle_bit:1;
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unsigned int read_count:7;
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u8 rc_address;
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u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
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};
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struct em28xx_IR {
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struct em28xx *dev;
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struct rc_dev *rc;
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char name[32];
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char phys[32];
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/* poll external decoder */
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int polling;
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struct delayed_work work;
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unsigned int full_code:1;
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unsigned int last_readcount;
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int (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
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};
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/**********************************************************
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I2C IR based get keycodes - should be used with ir-kbd-i2c
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**********************************************************/
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int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
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{
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unsigned char b;
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/* poll IR chip */
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if (1 != i2c_master_recv(ir->c, &b, 1)) {
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i2cdprintk("read error\n");
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return -EIO;
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}
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/* it seems that 0xFE indicates that a button is still hold
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down, while 0xff indicates that no button is hold
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down. 0xfe sequences are sometimes interrupted by 0xFF */
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i2cdprintk("key %02x\n", b);
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if (b == 0xff)
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return 0;
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if (b == 0xfe)
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/* keep old data */
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return 1;
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*ir_key = b;
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*ir_raw = b;
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return 1;
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}
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int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
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{
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unsigned char buf[2];
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u16 code;
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int size;
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/* poll IR chip */
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size = i2c_master_recv(ir->c, buf, sizeof(buf));
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if (size != 2)
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return -EIO;
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/* Does eliminate repeated parity code */
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if (buf[1] == 0xff)
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return 0;
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ir->old = buf[1];
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/*
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* Rearranges bits to the right order.
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* The bit order were determined experimentally by using
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* The original Hauppauge Grey IR and another RC5 that uses addr=0x08
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* The RC5 code has 14 bits, but we've experimentally determined
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* the meaning for only 11 bits.
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* So, the code translation is not complete. Yet, it is enough to
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* work with the provided RC5 IR.
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*/
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code =
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((buf[0] & 0x01) ? 0x0020 : 0) | /* 0010 0000 */
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((buf[0] & 0x02) ? 0x0010 : 0) | /* 0001 0000 */
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((buf[0] & 0x04) ? 0x0008 : 0) | /* 0000 1000 */
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((buf[0] & 0x08) ? 0x0004 : 0) | /* 0000 0100 */
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((buf[0] & 0x10) ? 0x0002 : 0) | /* 0000 0010 */
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((buf[0] & 0x20) ? 0x0001 : 0) | /* 0000 0001 */
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((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000 */
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((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000 */
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((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100 */
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((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010 */
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((buf[1] & 0x80) ? 0x0100 : 0); /* 0000 0001 */
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i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n",
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code, buf[1], buf[0]);
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/* return key */
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*ir_key = code;
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*ir_raw = code;
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return 1;
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}
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int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
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u32 *ir_raw)
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{
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unsigned char buf[3];
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/* poll IR chip */
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if (3 != i2c_master_recv(ir->c, buf, 3)) {
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i2cdprintk("read error\n");
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return -EIO;
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}
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i2cdprintk("key %02x\n", buf[2]&0x3f);
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if (buf[0] != 0x00)
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return 0;
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*ir_key = buf[2]&0x3f;
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*ir_raw = buf[2]&0x3f;
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return 1;
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}
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int em28xx_get_key_winfast_usbii_deluxe(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
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{
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unsigned char subaddr, keydetect, key;
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struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0, .buf = &subaddr, .len = 1},
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{ .addr = ir->c->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
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subaddr = 0x10;
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if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
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i2cdprintk("read error\n");
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return -EIO;
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}
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if (keydetect == 0x00)
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return 0;
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subaddr = 0x00;
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msg[1].buf = &key;
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if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
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i2cdprintk("read error\n");
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return -EIO;
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}
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if (key == 0x00)
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return 0;
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*ir_key = key;
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*ir_raw = key;
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return 1;
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}
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/**********************************************************
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Poll based get keycode functions
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**********************************************************/
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/* This is for the em2860/em2880 */
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static int default_polling_getkey(struct em28xx_IR *ir,
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struct em28xx_ir_poll_result *poll_result)
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{
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struct em28xx *dev = ir->dev;
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int rc;
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u8 msg[3] = { 0, 0, 0 };
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/* Read key toggle, brand, and key code
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on registers 0x45, 0x46 and 0x47
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*/
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rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
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msg, sizeof(msg));
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if (rc < 0)
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return rc;
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/* Infrared toggle (Reg 0x45[7]) */
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poll_result->toggle_bit = (msg[0] >> 7);
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/* Infrared read count (Reg 0x45[6:0] */
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poll_result->read_count = (msg[0] & 0x7f);
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/* Remote Control Address (Reg 0x46) */
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poll_result->rc_address = msg[1];
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/* Remote Control Data (Reg 0x47) */
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poll_result->rc_data[0] = msg[2];
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return 0;
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}
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static int em2874_polling_getkey(struct em28xx_IR *ir,
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struct em28xx_ir_poll_result *poll_result)
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{
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struct em28xx *dev = ir->dev;
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int rc;
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u8 msg[5] = { 0, 0, 0, 0, 0 };
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/* Read key toggle, brand, and key code
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on registers 0x51-55
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*/
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rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
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msg, sizeof(msg));
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if (rc < 0)
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return rc;
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/* Infrared toggle (Reg 0x51[7]) */
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poll_result->toggle_bit = (msg[0] >> 7);
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/* Infrared read count (Reg 0x51[6:0] */
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poll_result->read_count = (msg[0] & 0x7f);
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/* Remote Control Address (Reg 0x52) */
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poll_result->rc_address = msg[1];
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/* Remote Control Data (Reg 0x53-55) */
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poll_result->rc_data[0] = msg[2];
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poll_result->rc_data[1] = msg[3];
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poll_result->rc_data[2] = msg[4];
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return 0;
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}
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/**********************************************************
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Polling code for em28xx
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**********************************************************/
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static void em28xx_ir_handle_key(struct em28xx_IR *ir)
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{
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int result;
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struct em28xx_ir_poll_result poll_result;
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/* read the registers containing the IR status */
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result = ir->get_key(ir, &poll_result);
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if (unlikely(result < 0)) {
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dprintk("ir->get_key() failed %d\n", result);
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return;
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}
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if (unlikely(poll_result.read_count != ir->last_readcount)) {
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dprintk("%s: toggle: %d, count: %d, key 0x%02x%02x\n", __func__,
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poll_result.toggle_bit, poll_result.read_count,
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poll_result.rc_address, poll_result.rc_data[0]);
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if (ir->full_code)
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rc_keydown(ir->rc,
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poll_result.rc_address << 8 |
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poll_result.rc_data[0],
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poll_result.toggle_bit);
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else
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rc_keydown(ir->rc,
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poll_result.rc_data[0],
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poll_result.toggle_bit);
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if (ir->dev->chip_id == CHIP_ID_EM2874 ||
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ir->dev->chip_id == CHIP_ID_EM2884)
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/* The em2874 clears the readcount field every time the
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register is read. The em2860/2880 datasheet says that it
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is supposed to clear the readcount, but it doesn't. So with
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the em2874, we are looking for a non-zero read count as
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opposed to a readcount that is incrementing */
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ir->last_readcount = 0;
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else
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ir->last_readcount = poll_result.read_count;
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}
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}
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static void em28xx_ir_work(struct work_struct *work)
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{
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struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
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em28xx_ir_handle_key(ir);
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schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
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}
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static int em28xx_ir_start(struct rc_dev *rc)
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{
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struct em28xx_IR *ir = rc->priv;
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INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
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schedule_delayed_work(&ir->work, 0);
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return 0;
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}
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static void em28xx_ir_stop(struct rc_dev *rc)
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{
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struct em28xx_IR *ir = rc->priv;
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cancel_delayed_work_sync(&ir->work);
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}
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int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 rc_type)
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{
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int rc = 0;
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struct em28xx_IR *ir = rc_dev->priv;
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struct em28xx *dev = ir->dev;
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u8 ir_config = EM2874_IR_RC5;
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/* Adjust xclk based o IR table for RC5/NEC tables */
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if (rc_type == RC_TYPE_RC5) {
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dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
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ir->full_code = 1;
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} else if (rc_type == RC_TYPE_NEC) {
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dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
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ir_config = EM2874_IR_NEC;
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ir->full_code = 1;
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} else if (rc_type != RC_TYPE_UNKNOWN)
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rc = -EINVAL;
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em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
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EM28XX_XCLK_IR_RC5_MODE);
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/* Setup the proper handler based on the chip */
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switch (dev->chip_id) {
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case CHIP_ID_EM2860:
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case CHIP_ID_EM2883:
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ir->get_key = default_polling_getkey;
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break;
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case CHIP_ID_EM2884:
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case CHIP_ID_EM2874:
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case CHIP_ID_EM28174:
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ir->get_key = em2874_polling_getkey;
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em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
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break;
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default:
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printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
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dev->chip_id);
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rc = -EINVAL;
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}
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return rc;
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}
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int em28xx_ir_init(struct em28xx *dev)
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{
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struct em28xx_IR *ir;
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struct rc_dev *rc;
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int err = -ENOMEM;
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if (dev->board.ir_codes == NULL) {
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/* No remote control support */
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return 0;
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}
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ir = kzalloc(sizeof(*ir), GFP_KERNEL);
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rc = rc_allocate_device();
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if (!ir || !rc)
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goto err_out_free;
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/* record handles to ourself */
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ir->dev = dev;
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dev->ir = ir;
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ir->rc = rc;
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/*
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* em2874 supports more protocols. For now, let's just announce
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* the two protocols that were already tested
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*/
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rc->allowed_protos = RC_TYPE_RC5 | RC_TYPE_NEC;
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rc->priv = ir;
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rc->change_protocol = em28xx_ir_change_protocol;
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rc->open = em28xx_ir_start;
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rc->close = em28xx_ir_stop;
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/* By default, keep protocol field untouched */
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err = em28xx_ir_change_protocol(rc, RC_TYPE_UNKNOWN);
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if (err)
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goto err_out_free;
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/* This is how often we ask the chip for IR information */
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ir->polling = 100; /* ms */
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/* init input device */
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snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
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dev->name);
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usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
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strlcat(ir->phys, "/input0", sizeof(ir->phys));
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rc->input_name = ir->name;
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rc->input_phys = ir->phys;
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rc->input_id.bustype = BUS_USB;
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rc->input_id.version = 1;
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rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
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rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
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rc->dev.parent = &dev->udev->dev;
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rc->map_name = dev->board.ir_codes;
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rc->driver_name = MODULE_NAME;
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/* all done */
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err = rc_register_device(rc);
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if (err)
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goto err_out_stop;
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return 0;
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err_out_stop:
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dev->ir = NULL;
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err_out_free:
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rc_free_device(rc);
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kfree(ir);
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return err;
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}
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int em28xx_ir_fini(struct em28xx *dev)
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{
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struct em28xx_IR *ir = dev->ir;
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/* skip detach on non attached boards */
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if (!ir)
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return 0;
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if (ir->rc)
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rc_unregister_device(ir->rc);
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/* done */
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kfree(ir);
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dev->ir = NULL;
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return 0;
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}
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/**********************************************************
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Handle Webcam snapshot button
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**********************************************************/
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static void em28xx_query_sbutton(struct work_struct *work)
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{
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/* Poll the register and see if the button is depressed */
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struct em28xx *dev =
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container_of(work, struct em28xx, sbutton_query_work.work);
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int ret;
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ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
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if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
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u8 cleared;
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/* Button is depressed, clear the register */
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cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
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em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
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/* Not emulate the keypress */
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input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
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1);
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/* Now unpress the key */
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input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
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0);
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}
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/* Schedule next poll */
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schedule_delayed_work(&dev->sbutton_query_work,
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msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
|
|
}
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
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;
|
|
}
|