drivers/media/video/bttv-if.c

   1 /*
   2     bttv-if.c  --  interfaces to other kernel modules
   3         all the i2c code is here
   4         also the gpio interface exported by bttv (used by lirc)
   5
   6     bttv - Bt848 frame grabber driver
   7
   8     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   9                            & Marcus Metzler (mocm@thp.uni-koeln.de)
  10     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
  11
  12     This program is free software; you can redistribute it and/or modify
  13     it under the terms of the GNU General Public License as published by
  14     the Free Software Foundation; either version 2 of the License, or
  15     (at your option) any later version.
  16
  17     This program is distributed in the hope that it will be useful,
  18     but WITHOUT ANY WARRANTY; without even the implied warranty of
  19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20     GNU General Public License for more details.
  21
  22     You should have received a copy of the GNU General Public License
  23     along with this program; if not, write to the Free Software
  24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25
  26 */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30
  31 #include <asm/io.h>
  32
  33 #include "bttvp.h"
  34
  35 static struct i2c_algo_bit_data bttv_i2c_algo_template;
  36 static struct i2c_adapter bttv_i2c_adap_template;
  37 static struct i2c_client bttv_i2c_client_template;
  38
  39 EXPORT_SYMBOL(bttv_get_cardinfo);
  40 EXPORT_SYMBOL(bttv_get_pcidev);
  41 EXPORT_SYMBOL(bttv_get_id);
  42 EXPORT_SYMBOL(bttv_gpio_enable);
  43 EXPORT_SYMBOL(bttv_read_gpio);
  44 EXPORT_SYMBOL(bttv_write_gpio);
  45 EXPORT_SYMBOL(bttv_get_gpio_queue);
  46 EXPORT_SYMBOL(bttv_i2c_call);
  47
  48 /* ----------------------------------------------------------------------- */
  49 /* Exported functions - for other modules which want to access the         */
  50 /*                      gpio ports (IR for example)                        */
  51 /*                      see bttv.h for comments                            */
  52
  53 int bttv_get_cardinfo(unsigned int card, int *type, unsigned *cardid)
  54 {
  55         if (card >= bttv_num) {
  56                 return -1;
  57         }
  58         *type   = bttvs[card].type;
  59         *cardid = bttvs[card].cardid;
  60         return 0;
  61 }
  62
  63 struct pci_dev* bttv_get_pcidev(unsigned int card)
  64 {
  65         if (card >= bttv_num)
  66                 return NULL;
  67         return bttvs[card].dev;
  68 }
  69
  70 int bttv_get_id(unsigned int card)
  71 {
  72         printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");
  73         if (card >= bttv_num) {
  74                 return -1;
  75         }
  76         return bttvs[card].type;
  77 }
  78
  79 int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
  80 {
  81         struct bttv *btv;
  82
  83         if (card >= bttv_num) {
  84                 return -EINVAL;
  85         }
  86
  87         btv = &bttvs[card];
  88         btaor(data, ~mask, BT848_GPIO_OUT_EN);
  89         if (bttv_gpio)
  90                 bttv_gpio_tracking(btv,"extern enable");
  91         return 0;
  92 }
  93
  94 int bttv_read_gpio(unsigned int card, unsigned long *data)
  95 {
  96         struct bttv *btv;
  97
  98         if (card >= bttv_num) {
  99                 return -EINVAL;
 100         }
 101
 102         btv = &bttvs[card];
 103
 104         if(btv->shutdown) {
 105                 return -ENODEV;
 106         }
 107
 108 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
 109    because we set direct input on init */
 110         *data = btread(BT848_GPIO_DATA);
 111         return 0;
 112 }
 113
 114 int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
 115 {
 116         struct bttv *btv;
 117
 118         if (card >= bttv_num) {
 119                 return -EINVAL;
 120         }
 121
 122         btv = &bttvs[card];
 123
 124 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
 125    because direct input is set on init */
 126         btaor(data & mask, ~mask, BT848_GPIO_DATA);
 127         if (bttv_gpio)
 128                 bttv_gpio_tracking(btv,"extern write");
 129         return 0;
 130 }
 131
 132 wait_queue_head_t* bttv_get_gpio_queue(unsigned int card)
 133 {
 134         struct bttv *btv;
 135
 136         if (card >= bttv_num) {
 137                 return NULL;
 138         }
 139
 140         btv = &bttvs[card];
 141         if (bttvs[card].shutdown) {
 142                 return NULL;
 143         }
 144         return &btv->gpioq;
 145 }
 146
 147
 148 /* ----------------------------------------------------------------------- */
 149 /* I2C functions                                                           */
 150
 151 void bttv_bit_setscl(void *data, int state)
 152 {
 153         struct bttv *btv = (struct bttv*)data;
 154
 155         if (state)
 156                 btv->i2c_state |= 0x02;
 157         else
 158                 btv->i2c_state &= ~0x02;
 159         btwrite(btv->i2c_state, BT848_I2C);
 160         btread(BT848_I2C);
 161 }
 162
 163 void bttv_bit_setsda(void *data, int state)
 164 {
 165         struct bttv *btv = (struct bttv*)data;
 166
 167         if (state)
 168                 btv->i2c_state |= 0x01;
 169         else
 170                 btv->i2c_state &= ~0x01;
 171         btwrite(btv->i2c_state, BT848_I2C);
 172         btread(BT848_I2C);
 173 }
 174
 175 static int bttv_bit_getscl(void *data)
 176 {
 177         struct bttv *btv = (struct bttv*)data;
 178         int state;
 179
 180         state = btread(BT848_I2C) & 0x02 ? 1 : 0;
 181         return state;
 182 }
 183
 184 static int bttv_bit_getsda(void *data)
 185 {
 186         struct bttv *btv = (struct bttv*)data;
 187         int state;
 188
 189         state = btread(BT848_I2C) & 0x01;
 190         return state;
 191 }
 192
 193 static void bttv_inc_use(struct i2c_adapter *adap)
 194 {
 195         MOD_INC_USE_COUNT;
 196 }
 197
 198 static void bttv_dec_use(struct i2c_adapter *adap)
 199 {
 200         MOD_DEC_USE_COUNT;
 201 }
 202
 203 static int attach_inform(struct i2c_client *client)
 204 {
 205         struct bttv *btv = i2c_get_adapdata(client->adapter);
 206
 207         if (btv->tuner_type != UNSET)
 208                 bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
 209         if (btv->pinnacle_id != UNSET)
 210                 bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
 211                                       &btv->pinnacle_id);
 212
 213         if (bttv_debug)
 214                 printk("bttv%d: i2c attach [client=%s]\n",
 215                        btv->nr, i2c_clientname(client));
 216         return 0;
 217 }
 218
 219 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
 220 {
 221         if (0 != btv->i2c_rc)
 222                 return;
 223         i2c_clients_command(&btv->i2c_adap, cmd, arg);
 224 }
 225
 226 void bttv_i2c_call(unsigned int card, unsigned int cmd, void *arg)
 227 {
 228         if (card >= bttv_num)
 229                 return;
 230         bttv_call_i2c_clients(&bttvs[card], cmd, arg);
 231 }
 232
 233 static struct i2c_algo_bit_data bttv_i2c_algo_template = {
 234         .setsda  = bttv_bit_setsda,
 235         .setscl  = bttv_bit_setscl,
 236         .getsda  = bttv_bit_getsda,
 237         .getscl  = bttv_bit_getscl,
 238         .udelay  = 16,
 239         .mdelay  = 10,
 240         .timeout = 200,
 241 };
 242
 243 static struct i2c_adapter bttv_i2c_adap_template = {
 244         .inc_use           = bttv_inc_use,
 245         .dec_use           = bttv_dec_use,
 246 #ifdef I2C_ADAP_CLASS_TV_ANALOG
 247         .class             = I2C_ADAP_CLASS_TV_ANALOG,
 248 #endif
 249         I2C_DEVNAME("bt848"),
 250         .id                = I2C_HW_B_BT848,
 251         .client_register   = attach_inform,
 252 };
 253
 254 static struct i2c_client bttv_i2c_client_template = {
 255         I2C_DEVNAME("bttv internal"),
 256         .id       = -1,
 257 };
 258
 259
 260 /* read I2C */
 261 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
 262 {
 263         unsigned char buffer = 0;
 264
 265         if (0 != btv->i2c_rc)
 266                 return -1;
 267         if (bttv_verbose && NULL != probe_for)
 268                 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
 269                        btv->nr,probe_for,addr);
 270         btv->i2c_client.addr = addr >> 1;
 271         if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
 272                 if (NULL != probe_for) {
 273                         if (bttv_verbose)
 274                                 printk("not found\n");
 275                 } else
 276                         printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
 277                                btv->nr,addr);
 278                 return -1;
 279         }
 280         if (bttv_verbose && NULL != probe_for)
 281                 printk("found\n");
 282         return buffer;
 283 }
 284
 285 /* write I2C */
 286 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
 287                     unsigned char b2, int both)
 288 {
 289         unsigned char buffer[2];
 290         int bytes = both ? 2 : 1;
 291
 292         if (0 != btv->i2c_rc)
 293                 return -1;
 294         btv->i2c_client.addr = addr >> 1;
 295         buffer[0] = b1;
 296         buffer[1] = b2;
 297         if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
 298                 return -1;
 299         return 0;
 300 }
 301
 302 /* read EEPROM content */
 303 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
 304 {
 305         int i;
 306
 307         if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) {
 308                 printk(KERN_WARNING "bttv: readee error\n");
 309                 return;
 310         }
 311         btv->i2c_client.addr = addr >> 1;
 312         for (i=0; i<256; i+=16) {
 313                 if (16 != i2c_master_recv(&btv->i2c_client,eedata+i,16)) {
 314                         printk(KERN_WARNING "bttv: readee error\n");
 315                         break;
 316                 }
 317         }
 318 }
 319
 320 /* init + register i2c algo-bit adapter */
 321 int __devinit init_bttv_i2c(struct bttv *btv)
 322 {
 323         memcpy(&btv->i2c_adap, &bttv_i2c_adap_template,
 324                sizeof(struct i2c_adapter));
 325         memcpy(&btv->i2c_algo, &bttv_i2c_algo_template,
 326                sizeof(struct i2c_algo_bit_data));
 327         memcpy(&btv->i2c_client, &bttv_i2c_client_template,
 328                sizeof(struct i2c_client));
 329
 330         sprintf(btv->i2c_adap.name, "bt848 #%d", btv->nr);
 331
 332         btv->i2c_algo.data = btv;
 333         i2c_set_adapdata(&btv->i2c_adap, btv);
 334         btv->i2c_adap.algo_data = &btv->i2c_algo;
 335         btv->i2c_client.adapter = &btv->i2c_adap;
 336
 337         bttv_bit_setscl(btv,1);
 338         bttv_bit_setsda(btv,1);
 339
 340         btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap);
 341         return btv->i2c_rc;
 342 }
 343
 344 /*
 345  * Local variables:
 346  * c-basic-offset: 8
 347  * End:
 348  */