/* * bt856 - BT856A Digital Video Encoder (Rockwell Part) * * Copyright (C) 1999 Mike Bernson <mike@mlb.org> * Copyright (C) 1998 Dave Perks <dperks@ibm.net> * * Modifications for LML33/DC10plus unified driver * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx> * * This code was modify/ported from the saa7111 driver written * by Dave Perks. * * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net> * - moved over to linux>=2.4.x i2c protocol (9/9/2002) * * 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/init.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/slab.h> #include <linux/mm.h> #include <linux/signal.h> #include <linux/types.h> #include <linux/i2c.h> #include <linux/video_encoder.h> #include <asm/io.h> #include <asm/pgtable.h> #include <asm/page.h> #include <asm/uaccess.h> #include <linux/videodev.h> MODULE_DESCRIPTION("Brooktree-856A video encoder driver"); MODULE_AUTHOR("Mike Bernson & Dave Perks"); MODULE_LICENSE("GPL"); #define I2C_NAME(s) (s)->name static int debug; module_param(debug, int, 0); MODULE_PARM_DESC(debug, "Debug level (0-1)"); #define dprintk(num, format, args...) \ do { \ if (debug >= num) \ printk(format, ##args); \ } while (0) /* ----------------------------------------------------------------------- */ #define REG_OFFSET 0xDA #define BT856_NR_REG 6 struct bt856 { unsigned char reg[BT856_NR_REG]; int norm; int enable; }; #define I2C_BT856 0x88 /* ----------------------------------------------------------------------- */ static inline int bt856_write (struct i2c_client *client, u8 reg, u8 value) { struct bt856 *encoder = i2c_get_clientdata(client); encoder->reg[reg - REG_OFFSET] = value; return i2c_smbus_write_byte_data(client, reg, value); } static inline int bt856_setbit (struct i2c_client *client, u8 reg, u8 bit, u8 value) { struct bt856 *encoder = i2c_get_clientdata(client); return bt856_write(client, reg, (encoder-> reg[reg - REG_OFFSET] & ~(1 << bit)) | (value ? (1 << bit) : 0)); } static void bt856_dump (struct i2c_client *client) { int i; struct bt856 *encoder = i2c_get_clientdata(client); printk(KERN_INFO "%s: register dump:", I2C_NAME(client)); for (i = 0; i < BT856_NR_REG; i += 2) printk(" %02x", encoder->reg[i]); printk("\n"); } /* ----------------------------------------------------------------------- */ static int bt856_command (struct i2c_client *client, unsigned int cmd, void *arg) { struct bt856 *encoder = i2c_get_clientdata(client); switch (cmd) { case 0: /* This is just for testing!!! */ dprintk(1, KERN_INFO "bt856: init\n"); bt856_write(client, 0xdc, 0x18); bt856_write(client, 0xda, 0); bt856_write(client, 0xde, 0); bt856_setbit(client, 0xdc, 3, 1); //bt856_setbit(client, 0xdc, 6, 0); bt856_setbit(client, 0xdc, 4, 1); switch (encoder->norm) { case VIDEO_MODE_NTSC: bt856_setbit(client, 0xdc, 2, 0); break; case VIDEO_MODE_PAL: bt856_setbit(client, 0xdc, 2, 1); break; } bt856_setbit(client, 0xdc, 1, 1); bt856_setbit(client, 0xde, 4, 0); bt856_setbit(client, 0xde, 3, 1); if (debug != 0) bt856_dump(client); break; case ENCODER_GET_CAPABILITIES: { struct video_encoder_capability *cap = arg; dprintk(1, KERN_INFO "%s: get capabilities\n", I2C_NAME(client)); cap->flags = VIDEO_ENCODER_PAL | VIDEO_ENCODER_NTSC | VIDEO_ENCODER_CCIR; cap->inputs = 2; cap->outputs = 1; } break; case ENCODER_SET_NORM: { int *iarg = arg; dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client), *iarg); switch (*iarg) { case VIDEO_MODE_NTSC: bt856_setbit(client, 0xdc, 2, 0); break; case VIDEO_MODE_PAL: bt856_setbit(client, 0xdc, 2, 1); bt856_setbit(client, 0xda, 0, 0); //bt856_setbit(client, 0xda, 0, 1); break; default: return -EINVAL; } encoder->norm = *iarg; if (debug != 0) bt856_dump(client); } break; case ENCODER_SET_INPUT: { int *iarg = arg; dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client), *iarg); /* We only have video bus. * iarg = 0: input is from bt819 * iarg = 1: input is from ZR36060 */ switch (*iarg) { case 0: bt856_setbit(client, 0xde, 4, 0); bt856_setbit(client, 0xde, 3, 1); bt856_setbit(client, 0xdc, 3, 1); bt856_setbit(client, 0xdc, 6, 0); break; case 1: bt856_setbit(client, 0xde, 4, 0); bt856_setbit(client, 0xde, 3, 1); bt856_setbit(client, 0xdc, 3, 1); bt856_setbit(client, 0xdc, 6, 1); break; case 2: // Color bar bt856_setbit(client, 0xdc, 3, 0); bt856_setbit(client, 0xde, 4, 1); break; default: return -EINVAL; } if (debug != 0) bt856_dump(client); } break; case ENCODER_SET_OUTPUT: { int *iarg = arg; dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client), *iarg); /* not much choice of outputs */ if (*iarg != 0) { return -EINVAL; } } break; case ENCODER_ENABLE_OUTPUT: { int *iarg = arg; encoder->enable = !!*iarg; dprintk(1, KERN_INFO "%s: enable output %d\n", I2C_NAME(client), encoder->enable); } break; default: return -EINVAL; } return 0; } /* ----------------------------------------------------------------------- */ /* * Generic i2c probe * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' */ static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END }; static unsigned short ignore = I2C_CLIENT_END; static struct i2c_client_address_data addr_data = { .normal_i2c = normal_i2c, .probe = &ignore, .ignore = &ignore, }; static struct i2c_driver i2c_driver_bt856; static int bt856_detect_client (struct i2c_adapter *adapter, int address, int kind) { int i; struct i2c_client *client; struct bt856 *encoder; dprintk(1, KERN_INFO "bt856.c: detecting bt856 client on address 0x%x\n", address << 1); /* Check if the adapter supports the needed features */ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return 0; client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); if (!client) return -ENOMEM; client->addr = address; client->adapter = adapter; client->driver = &i2c_driver_bt856; strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client))); encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL); if (encoder == NULL) { kfree(client); return -ENOMEM; } encoder->norm = VIDEO_MODE_NTSC; encoder->enable = 1; i2c_set_clientdata(client, encoder); i = i2c_attach_client(client); if (i) { kfree(client); kfree(encoder); return i; } bt856_write(client, 0xdc, 0x18); bt856_write(client, 0xda, 0); bt856_write(client, 0xde, 0); bt856_setbit(client, 0xdc, 3, 1); //bt856_setbit(client, 0xdc, 6, 0); bt856_setbit(client, 0xdc, 4, 1); switch (encoder->norm) { case VIDEO_MODE_NTSC: bt856_setbit(client, 0xdc, 2, 0); break; case VIDEO_MODE_PAL: bt856_setbit(client, 0xdc, 2, 1); break; } bt856_setbit(client, 0xdc, 1, 1); bt856_setbit(client, 0xde, 4, 0); bt856_setbit(client, 0xde, 3, 1); if (debug != 0) bt856_dump(client); dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client), client->addr << 1); return 0; } static int bt856_attach_adapter (struct i2c_adapter *adapter) { dprintk(1, KERN_INFO "bt856.c: starting probe for adapter %s (0x%x)\n", I2C_NAME(adapter), adapter->id); return i2c_probe(adapter, &addr_data, &bt856_detect_client); } static int bt856_detach_client (struct i2c_client *client) { struct bt856 *encoder = i2c_get_clientdata(client); int err; err = i2c_detach_client(client); if (err) { return err; } kfree(encoder); kfree(client); return 0; } /* ----------------------------------------------------------------------- */ static struct i2c_driver i2c_driver_bt856 = { .driver = { .name = "bt856", }, .id = I2C_DRIVERID_BT856, .attach_adapter = bt856_attach_adapter, .detach_client = bt856_detach_client, .command = bt856_command, }; static int __init bt856_init (void) { return i2c_add_driver(&i2c_driver_bt856); } static void __exit bt856_exit (void) { i2c_del_driver(&i2c_driver_bt856); } module_init(bt856_init); module_exit(bt856_exit);