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214 lines
4.9 KiB
214 lines
4.9 KiB
/*
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* Driver for Philips SAB3036 "CITAC" tuner control chip.
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*
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* Author: Phil Blundell <philb@gnu.org>
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*
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* The SAB3036 is just about different enough from the chips that
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* tuner.c copes with to make it not worth the effort to crowbar
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* the support into that file. So instead we have a separate driver.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/videodev.h>
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#include <media/tuner.h>
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static int debug; /* insmod parameter */
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static int this_adap;
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static struct i2c_client client_template;
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END };
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static unsigned short ignore = I2C_CLIENT_END;
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static struct i2c_client_address_data addr_data = {
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.normal_i2c = normal_i2c,
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.probe = &ignore,
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.ignore = &ignore,
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};
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/* ---------------------------------------------------------------------- */
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static unsigned char
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tuner_getstatus (struct i2c_client *c)
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{
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unsigned char byte;
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if (i2c_master_recv(c, &byte, 1) != 1)
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printk(KERN_ERR "tuner-3036: I/O error.\n");
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return byte;
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}
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#define TUNER_FL 0x80
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static int
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tuner_islocked (struct i2c_client *c)
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{
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return (tuner_getstatus(c) & TUNER_FL);
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}
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/* ---------------------------------------------------------------------- */
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static void
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set_tv_freq(struct i2c_client *c, int freq)
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{
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u16 div = ((freq * 20) / 16);
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unsigned long give_up = jiffies + HZ;
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unsigned char buffer[2];
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if (debug)
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printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div);
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/* Select high tuning current */
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buffer[0] = 0x29;
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buffer[1] = 0x3e;
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if (i2c_master_send(c, buffer, 2) != 2)
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printk("tuner: i2c i/o error 1\n");
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buffer[0] = 0x80 | ((div>>8) & 0x7f);
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buffer[1] = div & 0xff;
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if (i2c_master_send(c, buffer, 2) != 2)
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printk("tuner: i2c i/o error 2\n");
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while (!tuner_islocked(c) && time_before(jiffies, give_up))
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schedule();
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if (!tuner_islocked(c))
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printk(KERN_WARNING "tuner: failed to achieve PLL lock\n");
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/* Select low tuning current and engage AFC */
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buffer[0] = 0x29;
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buffer[1] = 0xb2;
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if (i2c_master_send(c, buffer, 2) != 2)
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printk("tuner: i2c i/o error 3\n");
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if (debug)
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printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c));
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}
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/* ---------------------------------------------------------------------- */
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static int
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tuner_attach(struct i2c_adapter *adap, int addr, int kind)
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{
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static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 };
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struct i2c_client *client;
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if (this_adap > 0)
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return -1;
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this_adap++;
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client_template.adapter = adap;
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client_template.addr = addr;
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client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (client == NULL)
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return -ENOMEM;
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memcpy(client, &client_template, sizeof(struct i2c_client));
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printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client));
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i2c_attach_client(client);
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if (i2c_master_send(client, buffer, 2) != 2)
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printk("tuner: i2c i/o error 1\n");
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if (i2c_master_send(client, buffer+2, 2) != 2)
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printk("tuner: i2c i/o error 2\n");
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if (i2c_master_send(client, buffer+4, 2) != 2)
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printk("tuner: i2c i/o error 3\n");
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return 0;
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}
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static int
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tuner_detach(struct i2c_client *c)
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{
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return 0;
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}
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static int
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tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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int *iarg = (int*)arg;
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switch (cmd)
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{
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case VIDIOCSFREQ:
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set_tv_freq(client, *iarg);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int
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tuner_probe(struct i2c_adapter *adap)
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{
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this_adap = 0;
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if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_LP))
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return i2c_probe(adap, &addr_data, tuner_attach);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static struct i2c_driver
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i2c_driver_tuner =
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{
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.owner = THIS_MODULE,
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.name = "sab3036",
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.id = I2C_DRIVERID_SAB3036,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = tuner_probe,
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.detach_client = tuner_detach,
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.command = tuner_command
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};
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static struct i2c_client client_template =
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{
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.driver = &i2c_driver_tuner,
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.name = "SAB3036",
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};
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static int __init
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tuner3036_init(void)
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{
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i2c_add_driver(&i2c_driver_tuner);
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return 0;
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}
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static void __exit
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tuner3036_exit(void)
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{
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i2c_del_driver(&i2c_driver_tuner);
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}
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MODULE_DESCRIPTION("SAB3036 tuner driver");
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MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
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MODULE_LICENSE("GPL");
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module_param(debug, int, 0);
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MODULE_PARM_DESC(debug,"Enable debugging output");
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module_init(tuner3036_init);
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module_exit(tuner3036_exit);
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