/*
* USB Driver for ALi m5602 based webcams
*
* Copyright (C) 2008 Erik Andrén
* Copyright (C) 2007 Ilyes Gouta. Based on the m5603x Linux Driver Project.
* Copyright (C) 2005 m5603x Linux Driver Project <m5602@x3ng.com.br>
*
* Portions of code to USB interface and ALi driver software,
* Copyright (c) 2006 Willem Duinker
* v4l2 interface modeled after the V4L2 driver
* for SN9C10x PC Camera Controllers
*
* 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, version 2.
*
*/
#include "m5602_ov9650.h"
#include "m5602_ov7660.h"
#include "m5602_mt9m111.h"
#include "m5602_po1030.h"
#include "m5602_s5k83a.h"
#include "m5602_s5k4aa.h"
/* Kernel module parameters */
int force_sensor;
static int dump_bridge;
int dump_sensor;
static const __devinitdata struct usb_device_id m5602_table[] = {
{USB_DEVICE(0x0402, 0x5602)},
{}
};
MODULE_DEVICE_TABLE(usb, m5602_table);
/* Reads a byte from the m5602 */
int m5602_read_bridge(struct sd *sd, const u8 address, u8 *i2c_data)
{
int err;
struct usb_device *udev = sd->gspca_dev.dev;
__u8 *buf = sd->gspca_dev.usb_buf;
err = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
0x04, 0xc0, 0x14,
0x8100 + address, buf,
1, M5602_URB_MSG_TIMEOUT);
*i2c_data = buf[0];
PDEBUG(D_CONF, "Reading bridge register 0x%x containing 0x%x",
address, *i2c_data);
/* usb_control_msg(...) returns the number of bytes sent upon success,
mask that and return zero instead*/
return (err < 0) ? err : 0;
}
/* Writes a byte to to the m5602 */
int m5602_write_bridge(struct sd *sd, const u8 address, const u8 i2c_data)
{
int err;
struct usb_device *udev = sd->gspca_dev.dev;
__u8 *buf = sd->gspca_dev.usb_buf;
PDEBUG(D_CONF, "Writing bridge register 0x%x with 0x%x",
address, i2c_data);
memcpy(buf, bridge_urb_skeleton,
sizeof(bridge_urb_skeleton));
buf[1] = address;
buf[3] = i2c_data;
err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
0x04, 0x40, 0x19,
0x0000, buf,
4, M5602_URB_MSG_TIMEOUT);
/* usb_control_msg(...) returns the number of bytes sent upon success,
mask that and return zero instead */
return (err < 0) ? err : 0;
}
int m5602_wait_for_i2c(struct sd *sd)
{
int err;
u8 data;
do {
err = m5602_read_bridge(sd, M5602_XB_I2C_STATUS, &data);
} while ((data & I2C_BUSY) && !err);
return err;
}
int m5602_read_sensor(struct sd *sd, const u8 address,
u8 *i2c_data, const u8 len)
{
int err, i;
if (!len || len > sd->sensor->i2c_regW)
return -EINVAL;
err = m5602_wait_for_i2c(sd);
if (err < 0)
return err;
err = m5602_write_bridge(sd, M5602_XB_I2C_DEV_ADDR,
sd->sensor->i2c_slave_id);
if (err < 0)
return err;
err = m5602_write_bridge(sd, M5602_XB_I2C_REG_ADDR, address);
if (err < 0)
return err;
/* Sensors with registers that are of only
one byte width are differently read */
/* FIXME: This works with the ov9650, but has issues with the po1030 */
if (sd->sensor->i2c_regW == 1) {
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 1);
if (err < 0)
return err;
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x08);
} else {
err = m5602_write_bridge(sd, M5602_XB_I2C_CTRL, 0x18 + len);
}
for (i = 0; (i < len) && !err; i++) {
err = m5602_wait_for_i2c(sd);
if (err < 0)
return err;
err = m5602_read_bridge(sd, M5602_XB_I2C_DATA, &(i2c_data[i]));
PDEBUG(D_CONF, "Reading sensor register "
"0x%x containing 0x%x ", address, *i2c_data);
}
return err;
}
int m5602_write_sensor(struct sd *sd, const u8 address,
u8 *i2c_data, const u8 len)
{
int err, i;
u8 *p;
struct usb_device *udev = sd->gspca_dev.dev;
__u8 *buf = sd->gspca_dev.usb_buf;
/* No sensor with a data width larger than 16 bits has yet been seen */
if (len > sd->sensor->i2c_regW || !len)
return -EINVAL;
memcpy(buf, sensor_urb_skeleton,
sizeof(sensor_urb_skeleton));
buf[11] = sd->sensor->i2c_slave_id;
buf[15] = address;
/* Special case larger sensor writes */
p = buf + 16;
/* Copy a four byte write sequence for each byte to be written to */
for (i = 0; i < len; i++) {
memcpy(p, sensor_urb_skeleton + 16, 4);
p[3] = i2c_data[i];
p += 4;
PDEBUG(D_CONF, "Writing sensor register 0x%x with 0x%x",
address, i2c_data[i]);
}
/* Copy the tailer */
memcpy(p, sensor_urb_skeleton + 20, 4);
/* Set the total length */
p[3] = 0x10 + len;
err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
0x04, 0x40, 0x19,
0x0000, buf,
20 + len * 4, M5602_URB_MSG_TIMEOUT);
return (err < 0) ? err : 0;
}
/* Dump all the registers of the m5602 bridge,
unfortunately this breaks the camera until it's power cycled */
static void m5602_dump_bridge(struct sd *sd)
{
int i;
for (i = 0; i < 0x80; i++) {
unsigned char val = 0;
m5602_read_bridge(sd, i, &val);
info("ALi m5602 address 0x%x contains 0x%x", i, val);
}
info("Warning: The ALi m5602 webcam probably won't work "
"until it's power cycled");
}
static int m5602_probe_sensor(struct sd *sd)
{
/* Try the po1030 */
sd->sensor = &po1030;
if (!sd->sensor->probe(sd))
return 0;
/* Try the mt9m111 sensor */
sd->sensor = &mt9m111;
if (!sd->sensor->probe(sd))
return 0;
/* Try the s5k4aa */
sd->sensor = &s5k4aa;
if (!sd->sensor->probe(sd))
return 0;
/* Try the ov9650 */
sd->sensor = &ov9650;
if (!sd->sensor->probe(sd))
return 0;
/* Try the ov7660 */
sd->sensor = &ov7660;
if (!sd->sensor->probe(sd))
return 0;
/* Try the s5k83a */
sd->sensor = &s5k83a;
if (!sd->sensor->probe(sd))
return 0;
/* More sensor probe function goes here */
info("Failed to find a sensor");
sd->sensor = NULL;
return -ENODEV;
}
static int m5602_configure(struct gspca_dev *gspca_dev,
const struct usb_device_id *id);
static int m5602_init(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
int err;
PDEBUG(D_CONF, "Initializing ALi m5602 webcam");
/* Run the init sequence */
err = sd->sensor->init(sd);
return err;
}
static int m5602_start_transfer(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
__u8 *buf = sd->gspca_dev.usb_buf;
int err;
/* Send start command to the camera */
const u8 buffer[4] = {0x13, 0xf9, 0x0f, 0x01};
if (sd->sensor->start)
sd->sensor->start(sd);
memcpy(buf, buffer, sizeof(buffer));
err = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
0x04, 0x40, 0x19, 0x0000, buf,
sizeof(buffer), M5602_URB_MSG_TIMEOUT);
PDEBUG(D_STREAM, "Transfer started");
return (err < 0) ? err : 0;
}
static void m5602_urb_complete(struct gspca_dev *gspca_dev,
struct gspca_frame *frame,
__u8 *data, int len)
{
struct sd *sd = (struct sd *) gspca_dev;
if (len < 6) {
PDEBUG(D_PACK, "Packet is less than 6 bytes");
return;
}
/* Frame delimiter: ff xx xx xx ff ff */
if (data[0] == 0xff && data[4] == 0xff && data[5] == 0xff &&
data[2] != sd->frame_id) {
PDEBUG(D_FRAM, "Frame delimiter detected");
sd->frame_id = data[2];
/* Remove the extra fluff appended on each header */
data += 6;
len -= 6;
/* Complete the last frame (if any) */
frame = gspca_frame_add(gspca_dev, LAST_PACKET,
frame, data, 0);
sd->frame_count++;
/* Create a new frame */
gspca_frame_add(gspca_dev, FIRST_PACKET, frame, data, len);
PDEBUG(D_FRAM, "Starting new frame %d",
sd->frame_count);
} else {
int cur_frame_len = frame->data_end - frame->data;
/* Remove urb header */
data += 4;
len -= 4;
if (cur_frame_len + len <= frame->v4l2_buf.length) {
PDEBUG(D_FRAM, "Continuing frame %d copying %d bytes",
sd->frame_count, len);
gspca_frame_add(gspca_dev, INTER_PACKET, frame,
data, len);
} else if (frame->v4l2_buf.length - cur_frame_len > 0) {
/* Add the remaining data up to frame size */
gspca_frame_add(gspca_dev, INTER_PACKET, frame, data,
frame->v4l2_buf.length - cur_frame_len);
}
}
}
static void m5602_stop_transfer(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
/* Run the sensor specific end transfer sequence */
if (sd->sensor->stop)
sd->sensor->stop(sd);
}
/* sub-driver description, the ctrl and nctrl is filled at probe time */
static struct sd_desc sd_desc = {
.name = MODULE_NAME,
.config = m5602_configure,
.init = m5602_init,
.start = m5602_start_transfer,
.stopN = m5602_stop_transfer,
.pkt_scan = m5602_urb_complete
};
/* this function is called at probe time */
static int m5602_configure(struct gspca_dev *gspca_dev,
const struct usb_device_id *id)
{
struct sd *sd = (struct sd *) gspca_dev;
struct cam *cam;
int err;
cam = &gspca_dev->cam;
sd->desc = &sd_desc;
if (dump_bridge)
m5602_dump_bridge(sd);
/* Probe sensor */
err = m5602_probe_sensor(sd);
if (err)
goto fail;
return 0;
fail:
PDEBUG(D_ERR, "ALi m5602 webcam failed");
cam->cam_mode = NULL;
cam->nmodes = 0;
return err;
}
static int m5602_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
THIS_MODULE);
}
void m5602_disconnect(struct usb_interface *intf)
{
struct gspca_dev *gspca_dev = usb_get_intfdata(intf);
struct sd *sd = (struct sd *) gspca_dev;
if (sd->sensor->disconnect)
sd->sensor->disconnect(sd);
gspca_disconnect(intf);
}
static struct usb_driver sd_driver = {
.name = MODULE_NAME,
.id_table = m5602_table,
.probe = m5602_probe,
#ifdef CONFIG_PM
.suspend = gspca_suspend,
.resume = gspca_resume,
#endif
.disconnect = m5602_disconnect
};
/* -- module insert / remove -- */
static int __init mod_m5602_init(void)
{
int ret;
ret = usb_register(&sd_driver);
if (ret < 0)
return ret;
PDEBUG(D_PROBE, "registered");
return 0;
}
static void __exit mod_m5602_exit(void)
{
usb_deregister(&sd_driver);
PDEBUG(D_PROBE, "deregistered");
}
module_init(mod_m5602_init);
module_exit(mod_m5602_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(force_sensor, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(force_sensor,
"forces detection of a sensor, "
"1 = OV9650, 2 = S5K83A, 3 = S5K4AA, "
"4 = MT9M111, 5 = PO1030, 6 = OV7660");
module_param(dump_bridge, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dump_bridge, "Dumps all usb bridge registers at startup");
module_param(dump_sensor, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(dump_sensor, "Dumps all usb sensor registers "
"at startup providing a sensor is found");
