diff options
Diffstat (limited to 'drivers/media/video/tuner-3036.c')
| -rw-r--r-- | drivers/media/video/tuner-3036.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/drivers/media/video/tuner-3036.c b/drivers/media/video/tuner-3036.c new file mode 100644 index 000000000000..6b20aa902a8f --- /dev/null +++ b/drivers/media/video/tuner-3036.c @@ -0,0 +1,220 @@ +/* + * 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[] = {I2C_CLIENT_END}; +static unsigned short normal_i2c_range[] = {0x60, 0x61, I2C_CLIENT_END}; +static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; +static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; +static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; +static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; +static unsigned short force[2] = { I2C_CLIENT_END, I2C_CLIENT_END }; + +static struct i2c_client_address_data addr_data = { + normal_i2c, normal_i2c_range, + probe, probe_range, + ignore, ignore_range, + force +}; + +/* ---------------------------------------------------------------------- */ + +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 TUNER_SET_TVFREQ: + 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_ALGO_BIT | I2C_HW_B_LP)) + return i2c_probe(adap, &addr_data, tuner_attach); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static struct i2c_driver +i2c_driver_tuner = +{ + .owner = THIS_MODULE, + .name = "sab3036", + .id = I2C_DRIVERID_SAB3036, + .flags = I2C_DF_NOTIFY, + .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); |