diff options
Diffstat (limited to 'drivers/media/video/tea6420.c')
| -rw-r--r-- | drivers/media/video/tea6420.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/drivers/media/video/tea6420.c b/drivers/media/video/tea6420.c deleted file mode 100644 index 4dcba5a4fff..00000000000 --- a/drivers/media/video/tea6420.c +++ /dev/null @@ -1,198 +0,0 @@ - /* - tea6420 - i2c-driver for the tea6420 by SGS Thomson - - Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> - - The tea6420 is a bus controlled audio-matrix with 5 stereo inputs, - 4 stereo outputs and gain control for each output. - It is cascadable, i.e. it can be found at the adresses 0x98 - and 0x9a 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 <linux/module.h> -#include <linux/ioctl.h> -#include <linux/i2c.h> - -#include "tea6420.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]: ", KBUILD_MODNAME, __FUNCTION__, __LINE__); printk(args); } } while (0) - -/* addresses to scan, found only at 0x4c and/or 0x4d (7-Bit) */ -static unsigned short normal_i2c[] = { I2C_TEA6420_1, I2C_TEA6420_2, 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; - -/* make a connection between the input 'i' and the output 'o' - with gain 'g' for the tea6420-client 'client' (note: i = 6 means 'mute') */ -static int tea6420_switch(struct i2c_client *client, int i, int o, int g) -{ - u8 byte = 0; - int ret; - - dprintk("adr:0x%02x, i:%d, o:%d, g:%d\n", client->addr, i, o, g); - - /* check if the paramters are valid */ - if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0) - return -1; - - byte = ((o - 1) << 5); - byte |= (i - 1); - - /* to understand this, have a look at the tea6420-specs (p.5) */ - switch (g) { - case 0: - byte |= (3 << 3); - break; - case 2: - byte |= (2 << 3); - break; - case 4: - byte |= (1 << 3); - break; - case 6: - break; - } - - ret = i2c_smbus_write_byte(client, byte); - if (ret) { - dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret); - return -EIO; - } - - return 0; -} - -/* this function is called by i2c_probe */ -static int tea6420_detect(struct i2c_adapter *adapter, int address, int kind) -{ - struct i2c_client *client; - int err = 0, i = 0; - - /* let's see whether this adapter can support what we need */ - if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) { - return 0; - } - - /* allocate memory for client structure */ - client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); - if (0 == client) { - 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 != (err = i2c_attach_client(client))) { - kfree(client); - return err; - } - - /* set initial values: set "mute"-input to all outputs at gain 0 */ - err = 0; - for (i = 1; i < 5; i++) { - err += tea6420_switch(client, 6, i, 0); - } - if (err) { - dprintk("could not initialize tea6420\n"); - kfree(client); - return -ENODEV; - } - - printk("tea6420: 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_HW_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, &tea6420_detect); -} - -static int detach(struct i2c_client *client) -{ - int ret = i2c_detach_client(client); - kfree(client); - return ret; -} - -static int command(struct i2c_client *client, unsigned int cmd, void *arg) -{ - struct tea6420_multiplex *a = (struct tea6420_multiplex *)arg; - int result = 0; - - switch (cmd) { - case TEA6420_SWITCH: - result = tea6420_switch(client, a->in, a->out, a->gain); - break; - default: - return -ENOIOCTLCMD; - } - - return result; -} - -static struct i2c_driver driver = { - .driver = { - .name = "tea6420", - }, - .id = I2C_DRIVERID_TEA6420, - .attach_adapter = attach, - .detach_client = detach, - .command = command, -}; - -static struct i2c_client client_template = { - .name = "tea6420", - .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 <michael@mihu.de>"); -MODULE_DESCRIPTION("tea6420 driver"); -MODULE_LICENSE("GPL"); |