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