| 1 | /* |
| 2 | * Driver for the SAA5246A or SAA5281 Teletext (=Videotext) decoder chips from |
| 3 | * Philips. |
| 4 | * |
| 5 | * Only capturing of Teletext pages is tested. The videotext chips also have a |
| 6 | * TV output but my hardware doesn't use it. For this reason this driver does |
| 7 | * not support changing any TV display settings. |
| 8 | * |
| 9 | * Copyright (C) 2004 Michael Geng <linux@MichaelGeng.de> |
| 10 | * |
| 11 | * Derived from |
| 12 | * |
| 13 | * saa5249 driver |
| 14 | * Copyright (C) 1998 Richard Guenther |
| 15 | * <richard.guenther@student.uni-tuebingen.de> |
| 16 | * |
| 17 | * with changes by |
| 18 | * Alan Cox <Alan.Cox@linux.org> |
| 19 | * |
| 20 | * and |
| 21 | * |
| 22 | * vtx.c |
| 23 | * Copyright (C) 1994-97 Martin Buck <martin-2.buck@student.uni-ulm.de> |
| 24 | * |
| 25 | * This program is free software; you can redistribute it and/or modify |
| 26 | * it under the terms of the GNU General Public License as published by |
| 27 | * the Free Software Foundation; either version 2 of the License, or |
| 28 | * (at your option) any later version. |
| 29 | * |
| 30 | * This program is distributed in the hope that it will be useful, |
| 31 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 32 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 33 | * GNU General Public License for more details. |
| 34 | * |
| 35 | * You should have received a copy of the GNU General Public License |
| 36 | * along with this program; if not, write to the Free Software |
| 37 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 38 | * USA. |
| 39 | */ |
| 40 | |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/kernel.h> |
| 43 | #include <linux/sched.h> |
| 44 | #include <linux/mm.h> |
| 45 | #include <linux/init.h> |
| 46 | #include <linux/i2c.h> |
| 47 | #include <linux/videotext.h> |
| 48 | #include <linux/videodev.h> |
| 49 | #include "saa5246a.h" |
| 50 | |
| 51 | MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>"); |
| 52 | MODULE_DESCRIPTION("Philips SAA5246A, SAA5281 Teletext decoder driver"); |
| 53 | MODULE_LICENSE("GPL"); |
| 54 | |
| 55 | struct saa5246a_device |
| 56 | { |
| 57 | u8 pgbuf[NUM_DAUS][VTX_VIRTUALSIZE]; |
| 58 | int is_searching[NUM_DAUS]; |
| 59 | struct i2c_client *client; |
| 60 | struct semaphore lock; |
| 61 | }; |
| 62 | |
| 63 | static struct video_device saa_template; /* Declared near bottom */ |
| 64 | |
| 65 | /* Addresses to scan */ |
| 66 | static unsigned short normal_i2c[] = { I2C_ADDRESS, I2C_CLIENT_END }; |
| 67 | I2C_CLIENT_INSMOD; |
| 68 | |
| 69 | static struct i2c_client client_template; |
| 70 | |
| 71 | static int saa5246a_attach(struct i2c_adapter *adap, int addr, int kind) |
| 72 | { |
| 73 | int pgbuf; |
| 74 | int err; |
| 75 | struct i2c_client *client; |
| 76 | struct video_device *vd; |
| 77 | struct saa5246a_device *t; |
| 78 | |
| 79 | printk(KERN_INFO "saa5246a: teletext chip found.\n"); |
| 80 | client=kmalloc(sizeof(*client), GFP_KERNEL); |
| 81 | if(client==NULL) |
| 82 | return -ENOMEM; |
| 83 | client_template.adapter = adap; |
| 84 | client_template.addr = addr; |
| 85 | memcpy(client, &client_template, sizeof(*client)); |
| 86 | t = kmalloc(sizeof(*t), GFP_KERNEL); |
| 87 | if(t==NULL) |
| 88 | { |
| 89 | kfree(client); |
| 90 | return -ENOMEM; |
| 91 | } |
| 92 | memset(t, 0, sizeof(*t)); |
| 93 | strlcpy(client->name, IF_NAME, I2C_NAME_SIZE); |
| 94 | init_MUTEX(&t->lock); |
| 95 | |
| 96 | /* |
| 97 | * Now create a video4linux device |
| 98 | */ |
| 99 | |
| 100 | vd = video_device_alloc(); |
| 101 | if(vd==NULL) |
| 102 | { |
| 103 | kfree(t); |
| 104 | kfree(client); |
| 105 | return -ENOMEM; |
| 106 | } |
| 107 | i2c_set_clientdata(client, vd); |
| 108 | memcpy(vd, &saa_template, sizeof(*vd)); |
| 109 | |
| 110 | for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) |
| 111 | { |
| 112 | memset(t->pgbuf[pgbuf], ' ', sizeof(t->pgbuf[0])); |
| 113 | t->is_searching[pgbuf] = FALSE; |
| 114 | } |
| 115 | vd->priv=t; |
| 116 | |
| 117 | |
| 118 | /* |
| 119 | * Register it |
| 120 | */ |
| 121 | |
| 122 | if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0) |
| 123 | { |
| 124 | kfree(t); |
| 125 | kfree(client); |
| 126 | video_device_release(vd); |
| 127 | return err; |
| 128 | } |
| 129 | t->client = client; |
| 130 | i2c_attach_client(client); |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * We do most of the hard work when we become a device on the i2c. |
| 136 | */ |
| 137 | static int saa5246a_probe(struct i2c_adapter *adap) |
| 138 | { |
| 139 | if (adap->class & I2C_CLASS_TV_ANALOG) |
| 140 | return i2c_probe(adap, &addr_data, saa5246a_attach); |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int saa5246a_detach(struct i2c_client *client) |
| 145 | { |
| 146 | struct video_device *vd = i2c_get_clientdata(client); |
| 147 | i2c_detach_client(client); |
| 148 | video_unregister_device(vd); |
| 149 | kfree(vd->priv); |
| 150 | kfree(client); |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int saa5246a_command(struct i2c_client *device, unsigned int cmd, |
| 155 | void *arg) |
| 156 | { |
| 157 | return -EINVAL; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * I2C interfaces |
| 162 | */ |
| 163 | |
| 164 | static struct i2c_driver i2c_driver_videotext = |
| 165 | { |
| 166 | .driver = { |
| 167 | .owner = THIS_MODULE, |
| 168 | .name = IF_NAME, /* name */ |
| 169 | }, |
| 170 | .id = I2C_DRIVERID_SAA5249, /* in i2c.h */ |
| 171 | .attach_adapter = saa5246a_probe, |
| 172 | .detach_client = saa5246a_detach, |
| 173 | .command = saa5246a_command |
| 174 | }; |
| 175 | |
| 176 | static struct i2c_client client_template = { |
| 177 | .driver = &i2c_driver_videotext, |
| 178 | .name = "(unset)", |
| 179 | }; |
| 180 | |
| 181 | static int i2c_sendbuf(struct saa5246a_device *t, int reg, int count, u8 *data) |
| 182 | { |
| 183 | char buf[64]; |
| 184 | |
| 185 | buf[0] = reg; |
| 186 | memcpy(buf+1, data, count); |
| 187 | |
| 188 | if(i2c_master_send(t->client, buf, count+1)==count+1) |
| 189 | return 0; |
| 190 | return -1; |
| 191 | } |
| 192 | |
| 193 | static int i2c_senddata(struct saa5246a_device *t, ...) |
| 194 | { |
| 195 | unsigned char buf[64]; |
| 196 | int v; |
| 197 | int ct=0; |
| 198 | va_list argp; |
| 199 | va_start(argp,t); |
| 200 | |
| 201 | while((v=va_arg(argp,int))!=-1) |
| 202 | buf[ct++]=v; |
| 203 | return i2c_sendbuf(t, buf[0], ct-1, buf+1); |
| 204 | } |
| 205 | |