mirror of https://gitee.com/openkylin/linux.git
267 lines
6.3 KiB
C
267 lines
6.3 KiB
C
/* Driver for Bt832 CMOS Camera Video Processor
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i2c-addresses: 0x88 or 0x8a
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The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps)
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via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND).
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It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly
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connected to bt848/bt878 GPIO pins on this purpose.
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(see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets)
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Supported Cards:
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- Pixelview Rev.4E: 0x8a
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GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 !
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(c) Gunther Mayer, 2002
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STATUS:
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- detect chip and hexdump
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- reset chip and leave low power mode
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- detect camera present
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TODO:
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- make it work (find correct setup for Bt832 and Bt878)
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/types.h>
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#include <linux/videodev.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <media/audiochip.h>
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#include <media/v4l2-common.h>
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#include "bttv.h"
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#include "bt832.h"
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MODULE_LICENSE("GPL");
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { I2C_BT832_ALT1>>1, I2C_BT832_ALT2>>1,
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I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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int debug; /* debug output */
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module_param(debug, int, 0644);
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/* ---------------------------------------------------------------------- */
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static int bt832_detach(struct i2c_client *client);
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static struct i2c_driver driver;
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static struct i2c_client client_template;
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struct bt832 {
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struct i2c_client client;
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};
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int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf)
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{
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int i,rc;
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buf[0]=0x80; // start at register 0 with auto-increment
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if (1 != (rc = i2c_master_send(i2c_client_s,buf,1)))
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v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 1)\n",rc);
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for(i=0;i<65;i++)
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buf[i]=0;
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if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65)))
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v4l_err(i2c_client_s,"i2c i/o error: rc == %d (should be 65)\n",rc);
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// Note: On READ the first byte is the current index
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// (e.g. 0x80, what we just wrote)
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if(debug>1) {
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int i;
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v4l_dbg(2, debug,i2c_client_s,"hexdump:");
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for(i=1;i<65;i++) {
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if(i!=1) {
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if(((i-1)%8)==0) printk(" ");
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if(((i-1)%16)==0) {
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printk("\n");
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v4l_dbg(2, debug,i2c_client_s,"hexdump:");
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}
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}
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printk(" %02x",buf[i]);
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}
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printk("\n");
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}
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return 0;
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}
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// Return: 1 (is a bt832), 0 (No bt832 here)
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int bt832_init(struct i2c_client *i2c_client_s)
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{
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unsigned char *buf;
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int rc;
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buf=kmalloc(65,GFP_KERNEL);
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bt832_hexdump(i2c_client_s,buf);
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if(buf[0x40] != 0x31) {
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v4l_err(i2c_client_s,"This i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]);
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kfree(buf);
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return 0;
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}
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v4l_err(i2c_client_s,"Write 0 tp VPSTATUS\n");
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buf[0]=BT832_VP_STATUS; // Reg.52
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buf[1]= 0x00;
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if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
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v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
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bt832_hexdump(i2c_client_s,buf);
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// Leave low power mode:
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v4l_err(i2c_client_s,"leave low power mode.\n");
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buf[0]=BT832_CAM_SETUP0; //0x39 57
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buf[1]=0x08;
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if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
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v4l_err(i2c_client_s,"i2c i/o error LLPM: rc == %d (should be 2)\n",rc);
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bt832_hexdump(i2c_client_s,buf);
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v4l_info(i2c_client_s,"Write 0 tp VPSTATUS\n");
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buf[0]=BT832_VP_STATUS; // Reg.52
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buf[1]= 0x00;
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if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
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v4l_err(i2c_client_s,"i2c i/o error VPS: rc == %d (should be 2)\n",rc);
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bt832_hexdump(i2c_client_s,buf);
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// Enable Output
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v4l_info(i2c_client_s,"Enable Output\n");
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buf[0]=BT832_VP_CONTROL1; // Reg.40
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buf[1]= 0x27 & (~0x01); // Default | !skip
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if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
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v4l_err(i2c_client_s,"i2c i/o error EO: rc == %d (should be 2)\n",rc);
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bt832_hexdump(i2c_client_s,buf);
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// for testing (even works when no camera attached)
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v4l_info(i2c_client_s,"*** Generate NTSC M Bars *****\n");
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buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42
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buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally
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if (2 != (rc = i2c_master_send(i2c_client_s,buf,2)))
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v4l_info(i2c_client_s,"i2c i/o error MBAR: rc == %d (should be 2)\n",rc);
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v4l_info(i2c_client_s,"Camera Present: %s\n",
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(buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no");
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bt832_hexdump(i2c_client_s,buf);
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kfree(buf);
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return 1;
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}
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static int bt832_attach(struct i2c_adapter *adap, int addr, int kind)
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{
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struct bt832 *t;
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client_template.adapter = adap;
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client_template.addr = addr;
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if (NULL == (t = kzalloc(sizeof(*t), GFP_KERNEL)))
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return -ENOMEM;
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t->client = client_template;
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i2c_set_clientdata(&t->client, t);
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i2c_attach_client(&t->client);
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v4l_info(&t->client,"chip found @ 0x%x\n", addr<<1);
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if(! bt832_init(&t->client)) {
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bt832_detach(&t->client);
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return -1;
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}
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return 0;
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}
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static int bt832_probe(struct i2c_adapter *adap)
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{
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if (adap->class & I2C_CLASS_TV_ANALOG)
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return i2c_probe(adap, &addr_data, bt832_attach);
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return 0;
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}
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static int bt832_detach(struct i2c_client *client)
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{
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struct bt832 *t = i2c_get_clientdata(client);
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v4l_info(&t->client,"dettach\n");
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i2c_detach_client(client);
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kfree(t);
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return 0;
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}
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static int
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bt832_command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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struct bt832 *t = i2c_get_clientdata(client);
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if (debug>1)
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v4l_i2c_print_ioctl(&t->client,cmd);
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switch (cmd) {
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case BT832_HEXDUMP: {
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unsigned char *buf;
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buf=kmalloc(65,GFP_KERNEL);
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bt832_hexdump(&t->client,buf);
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kfree(buf);
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}
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break;
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case BT832_REATTACH:
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v4l_info(&t->client,"re-attach\n");
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i2c_del_driver(&driver);
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i2c_add_driver(&driver);
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break;
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static struct i2c_driver driver = {
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.driver = {
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.name = "bt832",
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},
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.id = 0, /* FIXME */
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.attach_adapter = bt832_probe,
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.detach_client = bt832_detach,
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.command = bt832_command,
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};
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static struct i2c_client client_template =
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{
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.name = "bt832",
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.driver = &driver,
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};
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static int __init bt832_init_module(void)
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{
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return i2c_add_driver(&driver);
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}
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static void __exit bt832_cleanup_module(void)
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{
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i2c_del_driver(&driver);
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}
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module_init(bt832_init_module);
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module_exit(bt832_cleanup_module);
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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