/*
em2820-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
Ludovico Cavedon <cavedon@sssup.it>
Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Based on the em2800 driver from 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <media/tuner.h>
#include <linux/video_decoder.h>
#include "em2820.h"
/* ----------------------------------------------------------- */
static unsigned int i2c_scan = 0;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
static unsigned int i2c_debug = 0;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
#define dprintk(fmt, args...) if (i2c_debug) do {\
printk(KERN_DEBUG "%s: %s: " fmt "\n",\
dev->name, __FUNCTION__ , ##args); } while (0)
#define dprintk1(fmt, args...) if (i2c_debug) do{ \
printk(KERN_DEBUG "%s: %s: " fmt, \
dev->name, __FUNCTION__ , ##args); } while (0)
#define dprintk2(fmt, args...) if (i2c_debug) do {\
printk(fmt , ##args); } while (0)
/*
* em2800_i2c_send_max4()
* send up to 4 bytes to the i2c device
*/
static int em2800_i2c_send_max4(struct em2820 *dev, unsigned char addr,
char *buf, int len)
{
int ret;
int write_timeout;
unsigned char b2[6];
BUG_ON(len < 1 || len > 4);
b2[5] = 0x80 + len - 1;
b2[4] = addr;
b2[3] = buf[0];
if (len > 1)
b2[2] = buf[1];
if (len > 2)
b2[1] = buf[2];
if (len > 3)
b2[0] = buf[3];
ret = dev->em2820_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
if (ret != 2 + len) {
em2820_warn("writting to i2c device failed (error=%i)\n", ret);
return -EIO;
}
for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
write_timeout -= 5) {
ret = dev->em2820_read_reg(dev, 0x05);
if (ret == 0x80 + len - 1)
return len;
mdelay(5);
}
em2820_warn("i2c write timed out\n");
return -EIO;
}
/*
* em2800_i2c_send_bytes()
*/
static int em2800_i2c_send_bytes(void *data, unsigned char addr, char *buf,
short len)
{
char *bufPtr = buf;
int ret;
int wrcount = 0;
int count;
int maxLen = 4;
struct em2820 *dev = (struct em2820 *)data;
while (len > 0) {
count = (len > maxLen) ? maxLen : len;
ret = em2800_i2c_send_max4(dev, addr, bufPtr, count);
if (ret > 0) {
len -= count;
bufPtr += count;
wrcount += count;
} else
return (ret < 0) ? ret : -EFAULT;
}
return wrcount;
}
/*
* em2800_i2c_check_for_device()
* check if there is a i2c_device at the supplied address
*/
static int em2800_i2c_check_for_device(struct em2820 *dev, unsigned char addr)
{
char msg;
int ret;
int write_timeout;
msg = addr;
ret = dev->em2820_write_regs(dev, 0x04, &msg, 1);
if (ret < 0) {
em2820_warn("setting i2c device address failed (error=%i)\n",
ret);
return ret;
}
msg = 0x84;
ret = dev->em2820_write_regs(dev, 0x05, &msg, 1);
if (ret < 0) {
em2820_warn("preparing i2c read failed (error=%i)\n", ret);
return ret;
}
for (write_timeout = EM2800_I2C_WRITE_TIMEOUT; write_timeout > 0;
write_timeout -= 5) {
unsigned msg = dev->em2820_read_reg(dev, 0x5);
if (msg == 0x94)
return -ENODEV;
else if (msg == 0x84)
return 0;
mdelay(5);
}
return -ENODEV;
}
/*
* em2800_i2c_recv_bytes()
* read from the i2c device
*/
static int em2800_i2c_recv_bytes(struct em2820 *dev, unsigned char addr,
char *buf, int len)
{
int ret;
/* check for the device and set i2c read address */
ret = em2800_i2c_check_for_device(dev, addr);
if (ret) {
em2820_warn
("preparing read at i2c address 0x%x failed (error=%i)\n",
addr, ret);
return ret;
}
ret = dev->em2820_read_reg_req_len(dev, 0x0, 0x3, buf, len);
if (ret < 0) {
em2820_warn("reading from i2c device at 0x%x failed (error=%i)",
addr, ret);
return ret;
}
return ret;
}
/*
* em2820_i2c_send_bytes()
* untested for more than 4 bytes
*/
static int em2820_i2c_send_bytes(void *data, unsigned char addr, char *buf,
short len, int stop)
{
int wrcount = 0;
struct em2820 *dev = (struct em2820 *)data;
wrcount = dev->em2820_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
return wrcount;
}
/*
* em2820_i2c_recv_bytes()
* read a byte from the i2c device
*/
static int em2820_i2c_recv_bytes(struct em2820 *dev, unsigned char addr,
char *buf, int len)
{
int ret;
ret = dev->em2820_read_reg_req_len(dev, 2, addr, buf, len);
if (ret < 0) {
em2820_warn("reading i2c device failed (error=%i)\n", ret);
return ret;
}
if (dev->em2820_read_reg(dev, 0x5) != 0)
return -ENODEV;
return ret;
}
/*
* em2820_i2c_check_for_device()
* check if there is a i2c_device at the supplied address
*/
static int em2820_i2c_check_for_device(struct em2820 *dev, unsigned char addr)
{
char msg;
int ret;
msg = addr;
ret = dev->em2820_read_reg_req(dev, 2, addr);
if (ret < 0) {
em2820_warn("reading from i2c device failed (error=%i)\n", ret);
return ret;
}
if (dev->em2820_read_reg(dev, 0x5) != 0)
return -ENODEV;
return 0;
}
/*
* em2820_i2c_xfer()
* the main i2c transfer function
*/
static int em2820_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg msgs[], int num)
{
struct em2820 *dev = i2c_adap->algo_data;
int addr, rc, i, byte;
if (num <= 0)
return 0;
for (i = 0; i < num; i++) {
addr = msgs[i].addr << 1;
dprintk1("%s %s addr=%x len=%d:",
(msgs[i].flags & I2C_M_RD) ? "read" : "write",
i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
if (!msgs[i].len) { /* no len: check only for device presence */
if (dev->is_em2800)
rc = em2800_i2c_check_for_device(dev, addr);
else
rc = em2820_i2c_check_for_device(dev, addr);
if (rc < 0) {
dprintk2(" no device\n");
return rc;
}
} else if (msgs[i].flags & I2C_M_RD) {
/* read bytes */
if (dev->is_em2800)
rc = em2800_i2c_recv_bytes(dev, addr,
msgs[i].buf,
msgs[i].len);
else
rc = em2820_i2c_recv_bytes(dev, addr,
msgs[i].buf,
msgs[i].len);
if (i2c_debug) {
for (byte = 0; byte < msgs[i].len; byte++) {
printk(" %02x", msgs[i].buf[byte]);
}
}
} else {
/* write bytes */
if (i2c_debug) {
for (byte = 0; byte < msgs[i].len; byte++)
printk(" %02x", msgs[i].buf[byte]);
}
if (dev->is_em2800)
rc = em2800_i2c_send_bytes(dev, addr,
msgs[i].buf,
msgs[i].len);
else
rc = em2820_i2c_send_bytes(dev, addr,
msgs[i].buf,
msgs[i].len,
i == num - 1);
if (rc < 0)
goto err;
}
if (i2c_debug)
printk("\n");
}
return num;
err:
dprintk2(" ERROR: %i\n", rc);
return rc;
}
static int em2820_i2c_eeprom(struct em2820 *dev, unsigned char *eedata, int len)
{
unsigned char buf, *p = eedata;
struct em2820_eeprom *em_eeprom = (void *)eedata;
int i, err, size = len, block;
dev->i2c_client.addr = 0xa0 >> 1;
/* Check if board has eeprom */
err = i2c_master_recv(&dev->i2c_client, &buf, 0);
if (err < 0)
return -1;
buf = 0;
if (1 != (err = i2c_master_send(&dev->i2c_client, &buf, 1))) {
printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
dev->name, err);
return -1;
}
while (size > 0) {
if (size > 16)
block = 16;
else
block = size;
if (block !=
(err = i2c_master_recv(&dev->i2c_client, p, block))) {
printk(KERN_WARNING
"%s: i2c eeprom read error (err=%d)\n",
dev->name, err);
return -1;
}
size -= block;
p += block;
}
for (i = 0; i < len; i++) {
if (0 == (i % 16))
printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
printk(" %02x", eedata[i]);
if (15 == (i % 16))
printk("\n");
}
printk(KERN_INFO "EEPROM ID= 0x%08x\n", em_eeprom->id);
printk(KERN_INFO "Vendor/Product ID= %04x:%04x\n", em_eeprom->vendor_ID,
em_eeprom->product_ID);
switch (em_eeprom->chip_conf >> 4 & 0x3) {
case 0:
printk(KERN_INFO "No audio on board.\n");
break;
case 1:
printk(KERN_INFO "AC97 audio (5 sample rates)\n");
break;
case 2:
printk(KERN_INFO "I2S audio, sample rate=32k\n");
break;
case 3:
printk(KERN_INFO "I2S audio, 3 sample rates\n");
break;
}
if (em_eeprom->chip_conf & 1 << 3)
printk(KERN_INFO "USB Remote wakeup capable\n");
if (em_eeprom->chip_conf & 1 << 2)
printk(KERN_INFO "USB Self power capable\n");
switch (em_eeprom->chip_conf & 0x3) {
case 0:
printk(KERN_INFO "500mA max power\n");
break;
case 1:
printk(KERN_INFO "400mA max power\n");
break;
case 2:
printk(KERN_INFO "300mA max power\n");
break;
case 3:
printk(KERN_INFO "200mA max power\n");
break;
}
return 0;
}
/* ----------------------------------------------------------- */
/*
* algo_control()
*/
static int algo_control(struct i2c_adapter *adapter,
unsigned int cmd, unsigned long arg)
{
return 0;
}
/*
* functionality()
*/
static u32 functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_SMBUS_EMUL;
}
#ifndef I2C_PEC
static void inc_use(struct i2c_adapter *adap)
{
MOD_INC_USE_COUNT;
}
static void dec_use(struct i2c_adapter *adap)
{
MOD_DEC_USE_COUNT;
}
#endif
static int em2820_set_tuner(int check_eeprom, struct i2c_client *client)
{
struct em2820 *dev = client->adapter->algo_data;
struct tuner_setup tun_setup;
if (dev->has_tuner) {
tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
tun_setup.type = dev->tuner_type;
tun_setup.addr = dev->tuner_addr;
em2820_i2c_call_clients(dev, TUNER_SET_TYPE_ADDR, &tun_setup);
}
return (0);
}
/*
* attach_inform()
* gets called when a device attaches to the i2c bus
* does some basic configuration
*/
static int attach_inform(struct i2c_client *client)
{
struct em2820 *dev = client->adapter->algo_data;
dprintk("address %x", client->addr << 1);
switch (client->addr << 1) {
case 0x86:
em2820_i2c_call_clients(dev, TDA9887_SET_CONFIG, &dev->tda9887_conf);
break;
case 0x4a:
dprintk1("attach_inform: saa7113 detected.\n");
break;
case 0xa0:
dprintk1("attach_inform: eeprom detected.\n");
break;
case 0x80:
case 0x88:
dprintk1("attach_inform: msp34xx detected.\n");
break;
case 0xb8:
case 0xba:
dprintk1("attach_inform: tvp5150 detected.\n");
break;
default:
dev->tuner_addr = client->addr;
em2820_set_tuner(-1, client);
}
return 0;
}
static struct i2c_algorithm em2820_algo = {
.master_xfer = em2820_i2c_xfer,
.algo_control = algo_control,
.functionality = functionality,
};
static struct i2c_adapter em2820_adap_template = {
#ifdef I2C_PEC
.owner = THIS_MODULE,
#else
.inc_use = inc_use,
.dec_use = dec_use,
#endif
#ifdef I2C_CLASS_TV_ANALOG
.class = I2C_CLASS_TV_ANALOG,
#endif
.name = "em2820",
.id = I2C_HW_B_EM2820,
.algo = &em2820_algo,
.client_register = attach_inform,
};
static struct i2c_client em2820_client_template = {
.name = "em2820 internal",
.flags = I2C_CLIENT_ALLOW_USE,
};
/* ----------------------------------------------------------- */
/*
* i2c_devs
* incomplete list of known devices
*/
static char *i2c_devs[128] = {
[0x4a >> 1] = "saa7113h",
[0x60 >> 1] = "remote IR sensor",
[0x86 >> 1] = "tda9887",
[0x80 >> 1] = "msp34xx",
[0x88 >> 1] = "msp34xx",
[0xa0 >> 1] = "eeprom",
[0xb8 >> 1] = "tvp5150a",
[0xba >> 1] = "tvp5150a",
[0xc0 >> 1] = "tuner (analog)",
[0xc2 >> 1] = "tuner (analog)",
[0xc4 >> 1] = "tuner (analog)",
[0xc6 >> 1] = "tuner (analog)",
};
/*
* do_i2c_scan()
* check i2c address range for devices
*/
static void do_i2c_scan(char *name, struct i2c_client *c)
{
unsigned char buf;
int i, rc;
for (i = 0; i < 128; i++) {
c->addr = i;
rc = i2c_master_recv(c, &buf, 0);
if (rc < 0)
continue;
printk(KERN_INFO "%s: found i2c device @ 0x%x [%s]\n", name,
i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
}
}
/*
* em2820_i2c_call_clients()
* send commands to all attached i2c devices
*/
void em2820_i2c_call_clients(struct em2820 *dev, unsigned int cmd, void *arg)
{
BUG_ON(NULL == dev->i2c_adap.algo_data);
i2c_clients_command(&dev->i2c_adap, cmd, arg);
}
/*
* em2820_i2c_register()
* register i2c bus
*/
int em2820_i2c_register(struct em2820 *dev)
{
BUG_ON(!dev->em2820_write_regs || !dev->em2820_read_reg);
BUG_ON(!dev->em2820_write_regs_req || !dev->em2820_read_reg_req);
dev->i2c_adap = em2820_adap_template;
dev->i2c_adap.dev.parent = &dev->udev->dev;
strcpy(dev->i2c_adap.name, dev->name);
dev->i2c_adap.algo_data = dev;
i2c_add_adapter(&dev->i2c_adap);
dev->i2c_client = em2820_client_template;
dev->i2c_client.adapter = &dev->i2c_adap;
em2820_i2c_eeprom(dev, dev->eedata, sizeof(dev->eedata));
if (i2c_scan)
do_i2c_scan(dev->name, &dev->i2c_client);
return 0;
}
/*
* em2820_i2c_unregister()
* unregister i2c_bus
*/
int em2820_i2c_unregister(struct em2820 *dev)
{
i2c_del_adapter(&dev->i2c_adap);
return 0;
}
