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I2C_DEVNAME and i2c_clientname were introduced in 2.5.68 [1] to help media/video driver authors who wanted their code to be compatible with both Linux 2.4 and 2.6. The cause of the incompatibility has gone since [2], so I think we can get rid of them, as they tend to make the code harder to read and longer to preprocess/compile for no more benefit. I'd hope nobody seriously attempts to keep media/video driver compatible across Linux trees anymore, BTW. [1] http://marc.theaimsgroup.com/?l=linux-kernel&m=104930186524598&w=2 [2] http://www.linuxhq.com/kernel/v2.6/0-test3/include/linux/i2c.h Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
200 lines
5.1 KiB
C
200 lines
5.1 KiB
C
/*
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tea6420 - i2c-driver for the tea6420 by SGS Thomson
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Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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The tea6420 is a bus controlled audio-matrix with 5 stereo inputs,
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4 stereo outputs and gain control for each output.
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It is cascadable, i.e. it can be found at the adresses 0x98
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and 0x9a on the i2c-bus.
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For detailed informations download the specifications directly
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from SGS Thomson at http://www.st.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/ioctl.h>
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#include <linux/i2c.h>
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#include "tea6420.h"
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static int debug = 0; /* insmod parameter */
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Turn on/off device debugging (default:off).");
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#define dprintk(args...) \
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do { if (debug) { printk("%s: %s()[%d]: ",__stringify(KBUILD_MODNAME), __FUNCTION__, __LINE__); printk(args); } } while (0)
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/* addresses to scan, found only at 0x4c and/or 0x4d (7-Bit) */
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static unsigned short normal_i2c[] = { I2C_TEA6420_1, I2C_TEA6420_2, I2C_CLIENT_END };
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/* magic definition of all other variables and things */
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I2C_CLIENT_INSMOD;
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static struct i2c_driver driver;
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static struct i2c_client client_template;
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/* make a connection between the input 'i' and the output 'o'
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with gain 'g' for the tea6420-client 'client' (note: i = 6 means 'mute') */
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static int tea6420_switch(struct i2c_client *client, int i, int o, int g)
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{
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u8 byte = 0;
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int ret;
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dprintk("adr:0x%02x, i:%d, o:%d, g:%d\n", client->addr, i, o, g);
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/* check if the paramters are valid */
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if (i < 1 || i > 6 || o < 1 || o > 4 || g < 0 || g > 6 || g % 2 != 0)
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return -1;
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byte = ((o - 1) << 5);
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byte |= (i - 1);
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/* to understand this, have a look at the tea6420-specs (p.5) */
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switch (g) {
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case 0:
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byte |= (3 << 3);
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break;
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case 2:
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byte |= (2 << 3);
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break;
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case 4:
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byte |= (1 << 3);
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break;
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case 6:
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break;
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}
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ret = i2c_smbus_write_byte(client, byte);
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if (ret) {
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dprintk("i2c_smbus_write_byte() failed, ret:%d\n", ret);
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return -EIO;
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}
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return 0;
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}
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/* this function is called by i2c_probe */
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static int tea6420_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *client;
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int err = 0, i = 0;
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/* let's see whether this adapter can support what we need */
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if (0 == i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE)) {
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return 0;
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}
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/* allocate memory for client structure */
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client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (0 == client) {
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return -ENOMEM;
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}
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memset(client, 0x0, sizeof(struct i2c_client));
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/* fill client structure */
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memcpy(client, &client_template, sizeof(struct i2c_client));
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client->addr = address;
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client->adapter = adapter;
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/* tell the i2c layer a new client has arrived */
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if (0 != (err = i2c_attach_client(client))) {
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kfree(client);
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return err;
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}
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/* set initial values: set "mute"-input to all outputs at gain 0 */
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err = 0;
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for (i = 1; i < 5; i++) {
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err += tea6420_switch(client, 6, i, 0);
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}
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if (err) {
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dprintk("could not initialize tea6420\n");
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kfree(client);
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return -ENODEV;
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}
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printk("tea6420: detected @ 0x%02x on adapter %s\n", address, &client->adapter->name[0]);
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return 0;
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}
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static int attach(struct i2c_adapter *adapter)
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{
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/* let's see whether this is a know adapter we can attach to */
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if (adapter->id != I2C_HW_SAA7146) {
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dprintk("refusing to probe on unknown adapter [name='%s',id=0x%x]\n", adapter->name, adapter->id);
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return -ENODEV;
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}
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return i2c_probe(adapter, &addr_data, &tea6420_detect);
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}
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static int detach(struct i2c_client *client)
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{
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int ret = i2c_detach_client(client);
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kfree(client);
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return ret;
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}
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static int command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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struct tea6420_multiplex *a = (struct tea6420_multiplex *)arg;
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int result = 0;
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switch (cmd) {
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case TEA6420_SWITCH:
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result = tea6420_switch(client, a->in, a->out, a->gain);
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return result;
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}
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static struct i2c_driver driver = {
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.owner = THIS_MODULE,
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.name = "tea6420",
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.id = I2C_DRIVERID_TEA6420,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = attach,
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.detach_client = detach,
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.command = command,
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};
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static struct i2c_client client_template = {
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.name = "tea6420",
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.driver = &driver,
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};
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static int __init this_module_init(void)
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{
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return i2c_add_driver(&driver);
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}
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static void __exit this_module_exit(void)
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{
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i2c_del_driver(&driver);
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}
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module_init(this_module_init);
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module_exit(this_module_exit);
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MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
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MODULE_DESCRIPTION("tea6420 driver");
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MODULE_LICENSE("GPL");
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