Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Philips SAB3036 "CITAC" tuner control chip. |
| 3 | * |
| 4 | * Author: Phil Blundell <philb@gnu.org> |
| 5 | * |
| 6 | * The SAB3036 is just about different enough from the chips that |
| 7 | * tuner.c copes with to make it not worth the effort to crowbar |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 8 | * the support into that file. So instead we have a separate driver. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/timer.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/init.h> |
| 25 | |
| 26 | #include <linux/i2c.h> |
| 27 | #include <linux/videodev.h> |
| 28 | |
| 29 | #include <media/tuner.h> |
| 30 | |
| 31 | static int debug; /* insmod parameter */ |
| 32 | static int this_adap; |
| 33 | |
| 34 | static struct i2c_client client_template; |
| 35 | |
| 36 | /* Addresses to scan */ |
Jean Delvare | b3d5496e | 2005-04-02 20:31:02 +0200 | [diff] [blame] | 37 | static unsigned short normal_i2c[] = { 0x60, 0x61, I2C_CLIENT_END }; |
Jean Delvare | 68cc9d0 | 2005-04-02 20:04:41 +0200 | [diff] [blame] | 38 | static unsigned short ignore = I2C_CLIENT_END; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | static struct i2c_client_address_data addr_data = { |
Jean Delvare | b3d5496e | 2005-04-02 20:31:02 +0200 | [diff] [blame] | 41 | .normal_i2c = normal_i2c, |
Jean Delvare | 68cc9d0 | 2005-04-02 20:04:41 +0200 | [diff] [blame] | 42 | .probe = &ignore, |
| 43 | .ignore = &ignore, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | }; |
| 45 | |
| 46 | /* ---------------------------------------------------------------------- */ |
| 47 | |
| 48 | static unsigned char |
| 49 | tuner_getstatus (struct i2c_client *c) |
| 50 | { |
| 51 | unsigned char byte; |
| 52 | if (i2c_master_recv(c, &byte, 1) != 1) |
| 53 | printk(KERN_ERR "tuner-3036: I/O error.\n"); |
| 54 | return byte; |
| 55 | } |
| 56 | |
| 57 | #define TUNER_FL 0x80 |
| 58 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 59 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | tuner_islocked (struct i2c_client *c) |
| 61 | { |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 62 | return (tuner_getstatus(c) & TUNER_FL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | /* ---------------------------------------------------------------------- */ |
| 66 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 67 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | set_tv_freq(struct i2c_client *c, int freq) |
| 69 | { |
| 70 | u16 div = ((freq * 20) / 16); |
| 71 | unsigned long give_up = jiffies + HZ; |
| 72 | unsigned char buffer[2]; |
| 73 | |
| 74 | if (debug) |
| 75 | printk(KERN_DEBUG "tuner: setting frequency %dMHz, divisor %x\n", freq / 16, div); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | /* Select high tuning current */ |
| 78 | buffer[0] = 0x29; |
| 79 | buffer[1] = 0x3e; |
| 80 | |
| 81 | if (i2c_master_send(c, buffer, 2) != 2) |
| 82 | printk("tuner: i2c i/o error 1\n"); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | buffer[0] = 0x80 | ((div>>8) & 0x7f); |
| 85 | buffer[1] = div & 0xff; |
| 86 | |
| 87 | if (i2c_master_send(c, buffer, 2) != 2) |
| 88 | printk("tuner: i2c i/o error 2\n"); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 89 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | while (!tuner_islocked(c) && time_before(jiffies, give_up)) |
| 91 | schedule(); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | if (!tuner_islocked(c)) |
| 94 | printk(KERN_WARNING "tuner: failed to achieve PLL lock\n"); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | /* Select low tuning current and engage AFC */ |
| 97 | buffer[0] = 0x29; |
| 98 | buffer[1] = 0xb2; |
| 99 | |
| 100 | if (i2c_master_send(c, buffer, 2) != 2) |
| 101 | printk("tuner: i2c i/o error 3\n"); |
| 102 | |
| 103 | if (debug) |
| 104 | printk(KERN_DEBUG "tuner: status %02x\n", tuner_getstatus(c)); |
| 105 | } |
| 106 | |
| 107 | /* ---------------------------------------------------------------------- */ |
| 108 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 109 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | tuner_attach(struct i2c_adapter *adap, int addr, int kind) |
| 111 | { |
| 112 | static unsigned char buffer[] = { 0x29, 0x32, 0x2a, 0, 0x2b, 0 }; |
| 113 | |
| 114 | struct i2c_client *client; |
| 115 | |
| 116 | if (this_adap > 0) |
| 117 | return -1; |
| 118 | this_adap++; |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 119 | |
| 120 | client_template.adapter = adap; |
| 121 | client_template.addr = addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 124 | if (client == NULL) |
| 125 | return -ENOMEM; |
| 126 | memcpy(client, &client_template, sizeof(struct i2c_client)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
| 128 | printk("tuner: SAB3036 found, status %02x\n", tuner_getstatus(client)); |
| 129 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 130 | i2c_attach_client(client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
| 132 | if (i2c_master_send(client, buffer, 2) != 2) |
| 133 | printk("tuner: i2c i/o error 1\n"); |
| 134 | if (i2c_master_send(client, buffer+2, 2) != 2) |
| 135 | printk("tuner: i2c i/o error 2\n"); |
| 136 | if (i2c_master_send(client, buffer+4, 2) != 2) |
| 137 | printk("tuner: i2c i/o error 3\n"); |
| 138 | return 0; |
| 139 | } |
| 140 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 141 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | tuner_detach(struct i2c_client *c) |
| 143 | { |
| 144 | return 0; |
| 145 | } |
| 146 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 147 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | tuner_command(struct i2c_client *client, unsigned int cmd, void *arg) |
| 149 | { |
| 150 | int *iarg = (int*)arg; |
| 151 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 152 | switch (cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
Mauro Carvalho Chehab | af9eeed | 2005-07-12 13:59:06 -0700 | [diff] [blame] | 154 | case VIDIOCSFREQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | set_tv_freq(client, *iarg); |
| 156 | break; |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | default: |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | return 0; |
| 162 | } |
| 163 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 164 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | tuner_probe(struct i2c_adapter *adap) |
| 166 | { |
| 167 | this_adap = 0; |
Jean Delvare | c7a4653 | 2005-08-11 23:41:56 +0200 | [diff] [blame] | 168 | if (adap->id == I2C_HW_B_LP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | return i2c_probe(adap, &addr_data, tuner_attach); |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | /* ----------------------------------------------------------------------- */ |
| 174 | |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 175 | static struct i2c_driver |
| 176 | i2c_driver_tuner = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
Laurent Riffard | 604f28e | 2005-11-26 20:43:39 +0100 | [diff] [blame] | 178 | .driver = { |
Laurent Riffard | 604f28e | 2005-11-26 20:43:39 +0100 | [diff] [blame] | 179 | .name = "sab3036", |
| 180 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | .id = I2C_DRIVERID_SAB3036, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | .attach_adapter = tuner_probe, |
| 183 | .detach_client = tuner_detach, |
| 184 | .command = tuner_command |
| 185 | }; |
| 186 | |
| 187 | static struct i2c_client client_template = |
| 188 | { |
Mauro Carvalho Chehab | d56410e | 2006-03-25 09:19:53 -0300 | [diff] [blame] | 189 | .driver = &i2c_driver_tuner, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | .name = "SAB3036", |
| 191 | }; |
| 192 | |
| 193 | static int __init |
| 194 | tuner3036_init(void) |
| 195 | { |
Arthur Othieno | d4437d3 | 2006-01-11 19:41:04 -0200 | [diff] [blame] | 196 | return i2c_add_driver(&i2c_driver_tuner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | static void __exit |
| 200 | tuner3036_exit(void) |
| 201 | { |
| 202 | i2c_del_driver(&i2c_driver_tuner); |
| 203 | } |
| 204 | |
| 205 | MODULE_DESCRIPTION("SAB3036 tuner driver"); |
| 206 | MODULE_AUTHOR("Philip Blundell <philb@gnu.org>"); |
| 207 | MODULE_LICENSE("GPL"); |
| 208 | |
| 209 | module_param(debug, int, 0); |
| 210 | MODULE_PARM_DESC(debug,"Enable debugging output"); |
| 211 | |
| 212 | module_init(tuner3036_init); |
| 213 | module_exit(tuner3036_exit); |