/* tda9840.h - i2c-driver for the tda9840 by SGS Thomson Copyright (C) 1998-2003 Michael Hunold The tda9840 is a stereo/dual sound processor with digital identification. It can be found at address 0x84 on the i2c-bus. For detailed informations download the specifications directly from SGS Thomson at http://www.st.com 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 #include #include #include #include #include #include #include "tda9840.h" static int debug = 0; /* insmod parameter */ MODULE_PARM(debug,"i"); #define dprintk if (debug) printk #define SWITCH 0x00 #define LEVEL_ADJUST 0x02 #define STEREO_ADJUST 0x03 #define TEST 0x04 /* addresses to scan, found only at 0x42 (7-Bit) */ static unsigned short normal_i2c[] = {I2C_TDA9840, I2C_CLIENT_END}; static unsigned short normal_i2c_range[] = {I2C_CLIENT_END}; /* magic definition of all other variables and things */ I2C_CLIENT_INSMOD; /* unique ID allocation */ static int tda9840_id = 0; static struct i2c_driver driver; static int tda9840_command(struct i2c_client *client, unsigned int cmd, void* arg) { int result = 0; switch (cmd) { case TDA9840_SWITCH: { int byte = *(int*)arg; dprintk("tda9840.o: TDA9840_SWITCH: 0x%02x\n",byte); if ( byte != TDA9840_SET_MONO && byte != TDA9840_SET_MUTE && byte != TDA9840_SET_STEREO && byte != TDA9840_SET_LANG1 && byte != TDA9840_SET_LANG2 && byte != TDA9840_SET_BOTH && byte != TDA9840_SET_BOTH_R && byte != TDA9840_SET_EXTERNAL ) { return -EINVAL; } if ( 0 != (result = i2c_smbus_write_byte_data(client, SWITCH, byte))) { printk("tda9840.o: TDA9840_SWITCH error.\n"); return -EFAULT; } return 0; } case TDA9840_LEVEL_ADJUST: { int byte = *(int*)arg; dprintk("tda9840.o: TDA9840_LEVEL_ADJUST: %d\n",byte); /* check for correct range */ if ( byte > 25 || byte < -20 ) return -EINVAL; /* calculate actual value to set, see specs, page 18 */ byte /= 5; if ( 0 < byte ) byte += 0x8; else byte = -byte; if ( 0 != (result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte))) { printk("tda9840.o: TDA9840_LEVEL_ADJUST error.\n"); return -EFAULT; } return 0; } case TDA9840_STEREO_ADJUST: { int byte = *(int*)arg; dprintk("tda9840.o: TDA9840_STEREO_ADJUST: %d\n",byte); /* check for correct range */ if ( byte > 25 || byte < -24 ) return -EINVAL; /* calculate actual value to set */ byte /= 5; if ( 0 < byte ) byte += 0x20; else byte = -byte; if ( 0 != (result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte))) { printk("tda9840.o: TDA9840_STEREO_ADJUST error.\n"); return -EFAULT; } return 0; } case TDA9840_DETECT: { int byte = 0x0; if ( -1 == (byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST))) { printk("tda9840.o: TDA9840_DETECT error while reading.\n"); return -EFAULT; } if( 0 != (byte & 0x80)) { dprintk("tda9840.o: TDA9840_DETECT, register contents invalid.\n"); return -EFAULT; } dprintk("tda9840.o: TDA9840_DETECT, result: 0x%02x (original byte)\n",byte); return ((byte & 0x60) >> 5); } case TDA9840_TEST: { int byte = *(int*)arg; dprintk("tda9840.o: TDA9840_TEST: 0x%02x\n",byte); /* mask out irrelevant bits */ byte &= 0x3; if ( 0 != (result = i2c_smbus_write_byte_data(client, TEST, byte))) { printk("tda9840.o: TDA9840_TEST error.\n"); return -EFAULT; } return 0; } default: return -ENOIOCTLCMD; } return 0; } static int tda9840_detect(struct i2c_adapter *adapter, int address, int kind) { struct i2c_client *client; int result = 0; int byte = 0x0; /* let's see whether this adapter can support what we need */ if ( 0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA|I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) { return 0; } /* allocate memory for client structure */ client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); if (0 == client) { printk("tda9840.o: not enough kernel memory.\n"); return -ENOMEM; } memset(client, 0, sizeof(struct i2c_client)); /* fill client structure */ sprintf(client->name,"tda9840 (0x%02x)", address); client->id = tda9840_id++; client->flags = 0; client->addr = address; client->adapter = adapter; client->driver = &driver; i2c_set_clientdata(client, NULL); /* tell the i2c layer a new client has arrived */ if (0 != (result = i2c_attach_client(client))) { kfree(client); return result; } /* set initial values for level & stereo - adjustment, mode */ byte = 0; if ( 0 != (result = tda9840_command(client, TDA9840_LEVEL_ADJUST, &byte))) { printk("tda9840.o: could not initialize ic #1. continuing anyway. (result:%d)\n",result); } if ( 0 != (result = tda9840_command(client, TDA9840_STEREO_ADJUST, &byte))) { printk("tda9840.o: could not initialize ic #2. continuing anyway. (result:%d)\n",result); } byte = TDA9840_SET_MONO; if ( 0 != (result = tda9840_command(client, TDA9840_SWITCH, &byte))) { printk("tda9840.o: could not initialize ic #3. continuing anyway. (result:%d)\n",result); } printk("tda9840.o: detected @ 0x%02x on adapter %s\n",2*address,&client->adapter->name[0]); return 0; } static int tda9840_attach(struct i2c_adapter *adapter) { /* let's see whether this is a know adapter we can attach to */ if( adapter->id != I2C_ALGO_SAA7146 ) { dprintk("tda9840.o: refusing to probe on unknown adapter [name='%s',id=0x%x]\n",adapter->name,adapter->id); return -ENODEV; } return i2c_probe(adapter,&addr_data,&tda9840_detect); } static int tda9840_detach(struct i2c_client *client) { int err = 0; if ( 0 != (err = i2c_detach_client(client))) { printk("tda9840.o: Client deregistration failed, client not detached.\n"); return err; } kfree(client); return 0; } static struct i2c_driver driver = { .owner = THIS_MODULE, .name = "tda9840 driver", .id = I2C_DRIVERID_TDA9840, .flags = I2C_DF_NOTIFY, .attach_adapter = tda9840_attach, .detach_client = tda9840_detach, .command = tda9840_command, }; static int tda9840_init_module(void) { i2c_add_driver(&driver); return 0; } static void tda9840_cleanup_module(void) { i2c_del_driver(&driver); } module_init(tda9840_init_module); module_exit(tda9840_cleanup_module); MODULE_AUTHOR("Michael Hunold "); MODULE_DESCRIPTION("tda9840 driver"); MODULE_LICENSE("GPL");