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path: root/drivers/media/video/bt832.c
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Diffstat (limited to 'drivers/media/video/bt832.c')
-rw-r--r--drivers/media/video/bt832.c271
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 00000000000..efe605a113a
--- /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);
+
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-27 08:09:30 +0000