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/*
I2C functions
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2005-2007 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 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
*/
/*
This file includes an i2c implementation that was reverse engineered
from the Hauppauge windows driver. Older ivtv versions used i2c-algo-bit,
which whilst fine under most circumstances, had trouble with the Zilog
CPU on the PVR-150 which handles IR functions (occasional inability to
communicate with the chip until it was reset) and also with the i2c
bus being completely unreachable when multiple PVR cards were present.
The implementation is very similar to i2c-algo-bit, but there are enough
subtle differences that the two are hard to merge. The general strategy
employed by i2c-algo-bit is to use udelay() to implement the timing
when putting out bits on the scl/sda lines. The general strategy taken
here is to poll the lines for state changes (see ivtv_waitscl and
ivtv_waitsda). In addition there are small delays at various locations
which poll the SCL line 5 times (ivtv_scldelay). I would guess that
since this is memory mapped I/O that the length of those delays is tied
to the PCI bus clock. There is some extra code to do with recovery
and retries. Since it is not known what causes the actual i2c problems
in the first place, the only goal if one was to attempt to use
i2c-algo-bit would be to try to make it follow the same code path.
This would be a lot of work, and I'm also not convinced that it would
provide a generic benefit to i2c-algo-bit. Therefore consider this
an engineering solution -- not pretty, but it works.
Some more general comments about what we are doing:
The i2c bus is a 2 wire serial bus, with clock (SCL) and data (SDA)
lines. To communicate on the bus (as a master, we don't act as a slave),
we first initiate a start condition (ivtv_start). We then write the
address of the device that we want to communicate with, along with a flag
that indicates whether this is a read or a write. The slave then issues
an ACK signal (ivtv_ack), which tells us that it is ready for reading /
writing. We then proceed with reading or writing (ivtv_read/ivtv_write),
and finally issue a stop condition (ivtv_stop) to make the bus available
to other masters.
There is an additional form of transaction where a write may be
immediately followed by a read. In this case, there is no intervening
stop condition. (Only the msp3400 chip uses this method of data transfer).
*/
#include "ivtv-driver.h"
#include "ivtv-cards.h"
#include "ivtv-gpio.h"
#include "ivtv-i2c.h"
#include <media/drv-intf/cx25840.h>
/* i2c implementation for cx23415/6 chip, ivtv project.
* Author: Kevin Thayer (nufan_wfk at yahoo.com)
*/
/* i2c stuff */
#define IVTV_REG_I2C_SETSCL_OFFSET 0x7000
#define IVTV_REG_I2C_SETSDA_OFFSET 0x7004
#define IVTV_REG_I2C_GETSCL_OFFSET 0x7008
#define IVTV_REG_I2C_GETSDA_OFFSET 0x700c
#define IVTV_CS53L32A_I2C_ADDR 0x11
#define IVTV_M52790_I2C_ADDR 0x48
#define IVTV_CX25840_I2C_ADDR 0x44
#define IVTV_SAA7115_I2C_ADDR 0x21
#define IVTV_SAA7127_I2C_ADDR 0x44
#define IVTV_SAA717x_I2C_ADDR 0x21
#define IVTV_MSP3400_I2C_ADDR 0x40
#define IVTV_HAUPPAUGE_I2C_ADDR 0x50
#define IVTV_WM8739_I2C_ADDR 0x1a
#define IVTV_WM8775_I2C_ADDR 0x1b
#define IVTV_TEA5767_I2C_ADDR 0x60
#define IVTV_UPD64031A_I2C_ADDR 0x12
#define IVTV_UPD64083_I2C_ADDR 0x5c
#define IVTV_VP27SMPX_I2C_ADDR 0x5b
#define IVTV_M52790_I2C_ADDR 0x48
#define IVTV_AVERMEDIA_IR_RX_I2C_ADDR 0x40
#define IVTV_HAUP_EXT_IR_RX_I2C_ADDR 0x1a
#define IVTV_HAUP_INT_IR_RX_I2C_ADDR 0x18
#define IVTV_Z8F0811_IR_TX_I2C_ADDR 0x70
#define IVTV_Z8F0811_IR_RX_I2C_ADDR 0x71
#define IVTV_ADAPTEC_IR_ADDR 0x6b
/* This array should match the IVTV_HW_ defines */
static const u8 hw_addrs[] = {
IVTV_CX25840_I2C_ADDR,
IVTV_SAA7115_I2C_ADDR,
IVTV_SAA7127_I2C_ADDR,
IVTV_MSP3400_I2C_ADDR,
0,
IVTV_WM8775_I2C_ADDR,
IVTV_CS53L32A_I2C_ADDR,
0,
IVTV_SAA7115_I2C_ADDR,
IVTV_UPD64031A_I2C_ADDR,
IVTV_UPD64083_I2C_ADDR,
IVTV_SAA717x_I2C_ADDR,
IVTV_WM8739_I2C_ADDR,
IVTV_VP27SMPX_I2C_ADDR,
IVTV_M52790_I2C_ADDR,
0, /* IVTV_HW_GPIO dummy driver ID */
IVTV_AVERMEDIA_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_AVER */
IVTV_HAUP_EXT_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_HAUP_EXT */
IVTV_HAUP_INT_IR_RX_I2C_ADDR, /* IVTV_HW_I2C_IR_RX_HAUP_INT */
IVTV_Z8F0811_IR_RX_I2C_ADDR, /* IVTV_HW_Z8F0811_IR_HAUP */
IVTV_ADAPTEC_IR_ADDR, /* IVTV_HW_I2C_IR_RX_ADAPTEC */
};
/* This array should match the IVTV_HW_ defines */
static const char * const hw_devicenames[] = {
"cx25840",
"saa7115",
"saa7127_auto", /* saa7127 or saa7129 */
"msp3400",
"tuner",
"wm8775",
"cs53l32a",
"tveeprom",
"saa7114",
"upd64031a",
"upd64083",
"saa717x",
"wm8739",
"vp27smpx",
"m52790",
"gpio",
"ir_video", /* IVTV_HW_I2C_IR_RX_AVER */
"ir_video", /* IVTV_HW_I2C_IR_RX_HAUP_EXT */
"ir_video", /* IVTV_HW_I2C_IR_RX_HAUP_INT */
"ir_z8f0811_haup", /* IVTV_HW_Z8F0811_IR_HAUP */
"ir_video", /* IVTV_HW_I2C_IR_RX_ADAPTEC */
};
static int get_key_adaptec(struct IR_i2c *ir, enum rc_proto *protocol,
u32 *scancode, u8 *toggle)
{
unsigned char keybuf[4];
keybuf[0] = 0x00;
i2c_master_send(ir->c, keybuf, 1);
/* poll IR chip */
if (i2c_master_recv(ir->c, keybuf, sizeof(keybuf)) != sizeof(keybuf)) {
return 0;
}
/* key pressed ? */
if (keybuf[2] == 0xff)
return 0;
/* remove repeat bit */
keybuf[2] &= 0x7f;
keybuf[3] |= 0x80;
*protocol = RC_PROTO_UNKNOWN;
*scancode = keybuf[3] | keybuf[2] << 8 | keybuf[1] << 16 |keybuf[0] << 24;
*toggle = 0;
return 1;
}
static int ivtv_i2c_new_ir(struct ivtv *itv, u32 hw, const char *type, u8 addr)
{
struct i2c_board_info info;
struct i2c_adapter *adap = &itv->i2c_adap;
struct IR_i2c_init_data *init_data = &itv->ir_i2c_init_data;
unsigned short addr_list[2] = { addr, I2C_CLIENT_END };
/* Only allow one IR receiver to be registered per board */
if (itv->hw_flags & IVTV_HW_IR_ANY)
return -1;
/* Our default information for ir-kbd-i2c.c to use */
switch (hw) {
case IVTV_HW_I2C_IR_RX_AVER:
init_data->ir_codes = RC_MAP_AVERMEDIA_CARDBUS;
init_data->internal_get_key_func =
IR_KBD_GET_KEY_AVERMEDIA_CARDBUS;
init_data->type = RC_PROTO_BIT_OTHER;
init_data->name = "AVerMedia AVerTV card";
break;
case IVTV_HW_I2C_IR_RX_HAUP_EXT:
case IVTV_HW_I2C_IR_RX_HAUP_INT:
init_data->ir_codes = RC_MAP_HAUPPAUGE;
init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP;
init_data->type = RC_PROTO_BIT_RC5;
init_data->name = itv->card_name;
break;
case IVTV_HW_Z8F0811_IR_HAUP:
/* Default to grey remote */
init_data->ir_codes = RC_MAP_HAUPPAUGE;
init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
RC_PROTO_BIT_RC6_6A_32;
init_data->name = itv->card_name;
break;
case IVTV_HW_I2C_IR_RX_ADAPTEC:
init_data->get_key = get_key_adaptec;
init_data->name = itv->card_name;
/* FIXME: The protocol and RC_MAP needs to be corrected */
init_data->ir_codes = RC_MAP_EMPTY;
init_data->type = RC_PROTO_BIT_UNKNOWN;
break;
}
memset(&info, 0, sizeof(struct i2c_board_info));
info.platform_data = init_data;
strscpy(info.type, type, I2C_NAME_SIZE);
return i2c_new_probed_device(adap, &info, addr_list, NULL) == NULL ?
-1 : 0;
}
/* Instantiate the IR receiver device using probing -- undesirable */
struct i2c_client *ivtv_i2c_new_ir_legacy(struct ivtv *itv)
{
struct i2c_board_info info;
/*
* The external IR receiver is at i2c address 0x34.
* The internal IR receiver is at i2c address 0x30.
*
* In theory, both can be fitted, and Hauppauge suggests an external
* overrides an internal. That's why we probe 0x1a (~0x34) first. CB
*
* Some of these addresses we probe may collide with other i2c address
* allocations, so this function must be called after all other i2c
* devices we care about are registered.
*/
const unsigned short addr_list[] = {
0x1a, /* Hauppauge IR external - collides with WM8739 */
0x18, /* Hauppauge IR internal */
I2C_CLIENT_END
};
memset(&info, 0, sizeof(struct
|