diff options
Diffstat (limited to 'drivers/media/video/bt832.c')
-rw-r--r-- | drivers/media/video/bt832.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/media/video/bt832.c b/drivers/media/video/bt832.c new file mode 100644 index 0000000..efe605a --- /dev/null +++ b/drivers/media/video/bt832.c @@ -0,0 +1,271 @@ +/* Driver for Bt832 CMOS Camera Video Processor + i2c-addresses: 0x88 or 0x8a + + The BT832 interfaces to a Quartzsight Digital Camera (352x288, 25 or 30 fps) + via a 9 pin connector ( 4-wire SDATA, 2-wire i2c, SCLK, VCC, GND). + It outputs an 8-bit 4:2:2 YUV or YCrCb video signal which can be directly + connected to bt848/bt878 GPIO pins on this purpose. + (see: VLSI Vision Ltd. www.vvl.co.uk for camera datasheets) + + Supported Cards: + - Pixelview Rev.4E: 0x8a + GPIO 0x400000 toggles Bt832 RESET, and the chip changes to i2c 0x88 ! + + (c) Gunther Mayer, 2002 + + STATUS: + - detect chip and hexdump + - reset chip and leave low power mode + - detect camera present + + TODO: + - make it work (find correct setup for Bt832 and Bt878) +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/types.h> +#include <linux/videodev.h> +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/slab.h> + +#include "id.h" +#include "audiochip.h" +#include "bttv.h" +#include "bt832.h" + +MODULE_LICENSE("GPL"); + +/* Addresses to scan */ +static unsigned short normal_i2c[] = {I2C_CLIENT_END}; +static unsigned short normal_i2c_range[] = {I2C_BT832_ALT1>>1,I2C_BT832_ALT2>>1,I2C_CLIENT_END}; +I2C_CLIENT_INSMOD; + +/* ---------------------------------------------------------------------- */ + +#define dprintk if (debug) printk + +static int bt832_detach(struct i2c_client *client); + + +static struct i2c_driver driver; +static struct i2c_client client_template; + +struct bt832 { + struct i2c_client client; +}; + +int bt832_hexdump(struct i2c_client *i2c_client_s, unsigned char *buf) +{ + int i,rc; + buf[0]=0x80; // start at register 0 with auto-increment + if (1 != (rc = i2c_master_send(i2c_client_s,buf,1))) + printk("bt832: i2c i/o error: rc == %d (should be 1)\n",rc); + + for(i=0;i<65;i++) + buf[i]=0; + if (65 != (rc=i2c_master_recv(i2c_client_s,buf,65))) + printk("bt832: i2c i/o error: rc == %d (should be 65)\n",rc); + + // Note: On READ the first byte is the current index + // (e.g. 0x80, what we just wrote) + + if(1) { + int i; + printk("BT832 hexdump:\n"); + for(i=1;i<65;i++) { + if(i!=1) { + if(((i-1)%8)==0) printk(" "); + if(((i-1)%16)==0) printk("\n"); + } + printk(" %02x",buf[i]); + } + printk("\n"); + } + return 0; +} + +// Return: 1 (is a bt832), 0 (No bt832 here) +int bt832_init(struct i2c_client *i2c_client_s) +{ + unsigned char *buf; + int rc; + + buf=kmalloc(65,GFP_KERNEL); + bt832_hexdump(i2c_client_s,buf); + + if(buf[0x40] != 0x31) { + printk("bt832: this i2c chip is no bt832 (id=%02x). Detaching.\n",buf[0x40]); + kfree(buf); + return 0; + } + + printk("Write 0 tp VPSTATUS\n"); + buf[0]=BT832_VP_STATUS; // Reg.52 + buf[1]= 0x00; + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc); + + bt832_hexdump(i2c_client_s,buf); + + + // Leave low power mode: + printk("Bt832: leave low power mode.\n"); + buf[0]=BT832_CAM_SETUP0; //0x39 57 + buf[1]=0x08; + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error LLPM: rc == %d (should be 2)\n",rc); + + bt832_hexdump(i2c_client_s,buf); + + printk("Write 0 tp VPSTATUS\n"); + buf[0]=BT832_VP_STATUS; // Reg.52 + buf[1]= 0x00; + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error VPS: rc == %d (should be 2)\n",rc); + + bt832_hexdump(i2c_client_s,buf); + + + // Enable Output + printk("Enable Output\n"); + buf[0]=BT832_VP_CONTROL1; // Reg.40 + buf[1]= 0x27 & (~0x01); // Default | !skip + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error EO: rc == %d (should be 2)\n",rc); + + bt832_hexdump(i2c_client_s,buf); + +#if 0 + // Full 30/25 Frame rate + printk("Full 30/25 Frame rate\n"); + buf[0]=BT832_VP_CONTROL0; // Reg.39 + buf[1]= 0x00; + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error FFR: rc == %d (should be 2)\n",rc); + + bt832_hexdump(i2c_client_s,buf); +#endif + +#if 1 + // for testing (even works when no camera attached) + printk("bt832: *** Generate NTSC M Bars *****\n"); + buf[0]=BT832_VP_TESTCONTROL0; // Reg. 42 + buf[1]=3; // Generate NTSC System M bars, Generate Frame timing internally + if (2 != (rc = i2c_master_send(i2c_client_s,buf,2))) + printk("bt832: i2c i/o error MBAR: rc == %d (should be 2)\n",rc); +#endif + + printk("Bt832: Camera Present: %s\n", + (buf[1+BT832_CAM_STATUS] & BT832_56_CAMERA_PRESENT) ? "yes":"no"); + + bt832_hexdump(i2c_client_s,buf); + kfree(buf); + return 1; +} + + + +static int bt832_attach(struct i2c_adapter *adap, int addr, + unsigned short flags, int kind) +{ + struct bt832 *t; + + printk("bt832_attach\n"); + + client_template.adapter = adap; + client_template.addr = addr; + + printk("bt832: chip found @ 0x%x\n", addr<<1); + + if (NULL == (t = kmalloc(sizeof(*t), GFP_KERNEL))) + return -ENOMEM; + memset(t,0,sizeof(*t)); + t->client = client_template; + t->client.data = t; + i2c_attach_client(&t->client); + + if(! bt832_init(&t->client)) { + bt832_detach(&t->client); + return -1; + } + + return 0; +} + +static int bt832_probe(struct i2c_adapter *adap) +{ + if (adap->class & I2C_CLASS_TV_ANALOG) + return i2c_probe(adap, &addr_data, bt832_attach); + return 0; +} + +static int bt832_detach(struct i2c_client *client) +{ + struct bt832 *t = (struct bt832*)client->data; + + printk("bt832: detach.\n"); + i2c_detach_client(client); + kfree(t); + return 0; +} + +static int +bt832_command(struct i2c_client *client, unsigned int cmd, void *arg) +{ + struct bt832 *t = (struct bt832*)client->data; + + printk("bt832: command %x\n",cmd); + + switch (cmd) { + case BT832_HEXDUMP: { + unsigned char *buf; + buf=kmalloc(65,GFP_KERNEL); + bt832_hexdump(&t->client,buf); + kfree(buf); + } + break; + case BT832_REATTACH: + printk("bt832: re-attach\n"); + i2c_del_driver(&driver); + i2c_add_driver(&driver); + break; + } + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static struct i2c_driver driver = { + .owner = THIS_MODULE, + .name = "i2c bt832 driver", + .id = -1, /* FIXME */ + .flags = I2C_DF_NOTIFY, + .attach_adapter = bt832_probe, + .detach_client = bt832_detach, + .command = bt832_command, +}; +static struct i2c_client client_template = +{ + .name = "bt832", + .flags = I2C_CLIENT_ALLOW_USE, + .driver = &driver, +}; + + +int bt832_init_module(void) +{ + i2c_add_driver(&driver); + return 0; +} + +static void bt832_cleanup_module(void) +{ + i2c_del_driver(&driver); +} + +module_init(bt832_init_module); +module_exit(bt832_cleanup_module); + |