From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/media/video/tda9840.c | 254 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 254 insertions(+) create mode 100644 drivers/media/video/tda9840.c (limited to 'drivers/media/video/tda9840.c') diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c new file mode 100644 index 00000000000..b5177c6f54f --- /dev/null +++ b/drivers/media/video/tda9840.c @@ -0,0 +1,254 @@ + /* + tda9840 - 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 "tda9840.h" + +static int debug = 0; /* insmod parameter */ +module_param(debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off)."); +#define dprintk(args...) \ + do { if (debug) { printk("%s: %s()[%d]: ",__stringify(KBUILD_MODNAME), __FUNCTION__, __LINE__); printk(args); } } while (0) + +#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; + +static struct i2c_driver driver; +static struct i2c_client client_template; + +static int command(struct i2c_client *client, unsigned int cmd, void *arg) +{ + int result; + int byte = *(int *)arg; + + switch (cmd) { + case TDA9840_SWITCH: + + dprintk("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; + } + + result = i2c_smbus_write_byte_data(client, SWITCH, byte); + if (result) + dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); + break; + + case TDA9840_LEVEL_ADJUST: + + dprintk("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; + + result = i2c_smbus_write_byte_data(client, LEVEL_ADJUST, byte); + if (result) + dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); + break; + + case TDA9840_STEREO_ADJUST: + + dprintk("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; + + result = i2c_smbus_write_byte_data(client, STEREO_ADJUST, byte); + if (result) + dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); + break; + + case TDA9840_DETECT: { + int *ret = (int *)arg; + + byte = i2c_smbus_read_byte_data(client, STEREO_ADJUST); + if (byte == -1) { + dprintk("i2c_smbus_read_byte_data() failed\n"); + return -EIO; + } + + if (0 != (byte & 0x80)) { + dprintk("TDA9840_DETECT: register contents invalid\n"); + return -EINVAL; + } + + dprintk("TDA9840_DETECT: byte: 0x%02x\n", byte); + *ret = ((byte & 0x60) >> 5); + result = 0; + break; + } + case TDA9840_TEST: + dprintk("TDA9840_TEST: 0x%02x\n", byte); + + /* mask out irrelevant bits */ + byte &= 0x3; + + result = i2c_smbus_write_byte_data(client, TEST, byte); + if (result) + dprintk("i2c_smbus_write_byte() failed, ret:%d\n", result); + break; + default: + return -ENOIOCTLCMD; + } + + if (result) + return -EIO; + + return 0; +} + +static int 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("not enough kernel memory\n"); + return -ENOMEM; + } + + /* fill client structure */ + memcpy(client, &client_template, sizeof(struct i2c_client)); + client->addr = address; + client->adapter = adapter; + + /* 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; + result = command(client, TDA9840_LEVEL_ADJUST, &byte); + result += command(client, TDA9840_STEREO_ADJUST, &byte); + byte = TDA9840_SET_MONO; + result = command(client, TDA9840_SWITCH, &byte); + if (result) { + dprintk("could not initialize tda9840\n"); + return -ENODEV; + } + + printk("tda9840: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]); + return 0; +} + +static int 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("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id); + return -ENODEV; + } + + return i2c_probe(adapter, &addr_data, &detect); +} + +static int detach(struct i2c_client *client) +{ + int ret = i2c_detach_client(client); + kfree(client); + return ret; +} + +static struct i2c_driver driver = { + .owner = THIS_MODULE, + .name = "tda9840", + .id = I2C_DRIVERID_TDA9840, + .flags = I2C_DF_NOTIFY, + .attach_adapter = attach, + .detach_client = detach, + .command = command, +}; + +static struct i2c_client client_template = { + I2C_DEVNAME("tda9840"), + .driver = &driver, +}; + +static int __init this_module_init(void) +{ + return i2c_add_driver(&driver); +} + +static void __exit this_module_exit(void) +{ + i2c_del_driver(&driver); +} + +module_init(this_module_init); +module_exit(this_module_exit); + +MODULE_AUTHOR("Michael Hunold "); +MODULE_DESCRIPTION("tda9840 driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3