1 /* 2 3 bttv-i2c.c -- all the i2c code is here 4 5 bttv - Bt848 frame grabber driver 6 7 Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) 8 & Marcus Metzler (mocm@thp.uni-koeln.de) 9 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org> 10 11 (c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org> 12 - Multituner support and i2c address binding 13 14 This program is free software; you can redistribute it and/or modify 15 it under the terms of the GNU General Public License as published by 16 the Free Software Foundation; either version 2 of the License, or 17 (at your option) any later version. 18 19 This program is distributed in the hope that it will be useful, 20 but WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 GNU General Public License for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program; if not, write to the Free Software 26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 27 28 */ 29 30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 31 32 #include <linux/module.h> 33 #include <linux/init.h> 34 #include <linux/delay.h> 35 36 #include "bttvp.h" 37 #include <media/v4l2-common.h> 38 #include <linux/jiffies.h> 39 #include <asm/io.h> 40 41 static int i2c_debug; 42 static int i2c_hw; 43 static int i2c_scan; 44 module_param(i2c_debug, int, 0644); 45 MODULE_PARM_DESC(i2c_debug, "configure i2c debug level"); 46 module_param(i2c_hw, int, 0444); 47 MODULE_PARM_DESC(i2c_hw,"force use of hardware i2c support, " 48 "instead of software bitbang"); 49 module_param(i2c_scan, int, 0444); 50 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); 51 52 static unsigned int i2c_udelay = 5; 53 module_param(i2c_udelay, int, 0444); 54 MODULE_PARM_DESC(i2c_udelay,"soft i2c delay at insmod time, in usecs " 55 "(should be 5 or higher). Lower value means higher bus speed."); 56 57 /* ----------------------------------------------------------------------- */ 58 /* I2C functions - bitbanging adapter (software i2c) */ 59 60 static void bttv_bit_setscl(void *data, int state) 61 { 62 struct bttv *btv = (struct bttv*)data; 63 64 if (state) 65 btv->i2c_state |= 0x02; 66 else 67 btv->i2c_state &= ~0x02; 68 btwrite(btv->i2c_state, BT848_I2C); 69 btread(BT848_I2C); 70 } 71 72 static void bttv_bit_setsda(void *data, int state) 73 { 74 struct bttv *btv = (struct bttv*)data; 75 76 if (state) 77 btv->i2c_state |= 0x01; 78 else 79 btv->i2c_state &= ~0x01; 80 btwrite(btv->i2c_state, BT848_I2C); 81 btread(BT848_I2C); 82 } 83 84 static int bttv_bit_getscl(void *data) 85 { 86 struct bttv *btv = (struct bttv*)data; 87 int state; 88 89 state = btread(BT848_I2C) & 0x02 ? 1 : 0; 90 return state; 91 } 92 93 static int bttv_bit_getsda(void *data) 94 { 95 struct bttv *btv = (struct bttv*)data; 96 int state; 97 98 state = btread(BT848_I2C) & 0x01; 99 return state; 100 } 101 102 static struct i2c_algo_bit_data bttv_i2c_algo_bit_template = { 103 .setsda = bttv_bit_setsda, 104 .setscl = bttv_bit_setscl, 105 .getsda = bttv_bit_getsda, 106 .getscl = bttv_bit_getscl, 107 .udelay = 16, 108 .timeout = 200, 109 }; 110 111 /* ----------------------------------------------------------------------- */ 112 /* I2C functions - hardware i2c */ 113 114 static u32 functionality(struct i2c_adapter *adap) 115 { 116 return I2C_FUNC_SMBUS_EMUL; 117 } 118 119 static int 120 bttv_i2c_wait_done(struct bttv *btv) 121 { 122 int rc = 0; 123 124 /* timeout */ 125 if (wait_event_interruptible_timeout(btv->i2c_queue, 126 btv->i2c_done, msecs_to_jiffies(85)) == -ERESTARTSYS) 127 rc = -EIO; 128 129 if (btv->i2c_done & BT848_INT_RACK) 130 rc = 1; 131 btv->i2c_done = 0; 132 return rc; 133 } 134 135 #define I2C_HW (BT878_I2C_MODE | BT848_I2C_SYNC |\ 136 BT848_I2C_SCL | BT848_I2C_SDA) 137 138 static int 139 bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last) 140 { 141 u32 xmit; 142 int retval,cnt; 143 144 /* sanity checks */ 145 if (0 == msg->len) 146 return -EINVAL; 147 148 /* start, address + first byte */ 149 xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW; 150 if (msg->len > 1 || !last) 151 xmit |= BT878_I2C_NOSTOP; 152 btwrite(xmit, BT848_I2C); 153 retval = bttv_i2c_wait_done(btv); 154 if (retval < 0) 155 goto err; 156 if (retval == 0) 157 goto eio; 158 if (i2c_debug) { 159 pr_cont(" <W %02x %02x", msg->addr << 1, msg->buf[0]); 160 } 161 162 for (cnt = 1; cnt < msg->len; cnt++ ) { 163 /* following bytes */ 164 xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART; 165 if (cnt < msg->len-1 || !last) 166 xmit |= BT878_I2C_NOSTOP; 167 btwrite(xmit, BT848_I2C); 168 retval = bttv_i2c_wait_done(btv); 169 if (retval < 0) 170 goto err; 171 if (retval == 0) 172 goto eio; 173 if (i2c_debug) 174 pr_cont(" %02x", msg->buf[cnt]); 175 } 176 if (i2c_debug && !(xmit & BT878_I2C_NOSTOP)) 177 pr_cont(">\n"); 178 return msg->len; 179 180 eio: 181 retval = -EIO; 182 err: 183 if (i2c_debug) 184 pr_cont(" ERR: %d\n",retval); 185 return retval; 186 } 187 188 static int 189 bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last) 190 { 191 u32 xmit; 192 u32 cnt; 193 int retval; 194 195 for (cnt = 0; cnt < msg->len; cnt++) { 196 xmit = (msg->addr << 25) | (1 << 24) | I2C_HW; 197 if (cnt < msg->len-1) 198 xmit |= BT848_I2C_W3B; 199 if (cnt < msg->len-1 || !last) 200 xmit |= BT878_I2C_NOSTOP; 201 if (cnt) 202 xmit |= BT878_I2C_NOSTART; 203 204 if (i2c_debug) { 205 if (!(xmit & BT878_I2C_NOSTART)) 206 pr_cont(" <R %02x", (msg->addr << 1) +1); 207 } 208 209 btwrite(xmit, BT848_I2C); 210 retval = bttv_i2c_wait_done(btv); 211 if (retval < 0) 212 goto err; 213 if (retval == 0) 214 goto eio; 215 msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff; 216 if (i2c_debug) { 217 pr_cont(" =%02x", msg->buf[cnt]); 218 } 219 if (i2c_debug && !(xmit & BT878_I2C_NOSTOP)) 220 pr_cont(" >\n"); 221 } 222 223 224 return msg->len; 225 226 eio: 227 retval = -EIO; 228 err: 229 if (i2c_debug) 230 pr_cont(" ERR: %d\n",retval); 231 return retval; 232 } 233 234 static int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) 235 { 236 struct v4l2_device *v4l2_dev = i2c_get_adapdata(i2c_adap); 237 struct bttv *btv = to_bttv(v4l2_dev); 238 int retval = 0; 239 int i; 240 241 if (i2c_debug) 242 pr_debug("bt-i2c:"); 243 244 btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT); 245 for (i = 0 ; i < num; i++) { 246 if (msgs[i].flags & I2C_M_RD) { 247 /* read */ 248 retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num); 249 if (retval < 0) 250 goto err; 251 } else { 252 /* write */ 253 retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num); 254 if (retval < 0) 255 goto err; 256 } 257 } 258 return num; 259 260 err: 261 return retval; 262 } 263 264 static const struct i2c_algorithm bttv_algo = { 265 .master_xfer = bttv_i2c_xfer, 266 .functionality = functionality, 267 }; 268 269 /* ----------------------------------------------------------------------- */ 270 /* I2C functions - common stuff */ 271 272 /* read I2C */ 273 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for) 274 { 275 unsigned char buffer = 0; 276 277 if (0 != btv->i2c_rc) 278 return -1; 279 if (bttv_verbose && NULL != probe_for) 280 pr_info("%d: i2c: checking for %s @ 0x%02x... ", 281 btv->c.nr, probe_for, addr); 282 btv->i2c_client.addr = addr >> 1; 283 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) { 284 if (NULL != probe_for) { 285 if (bttv_verbose) 286 pr_cont("not found\n"); 287 } else 288 pr_warn("%d: i2c read 0x%x: error\n", 289 btv->c.nr, addr); 290 return -1; 291 } 292 if (bttv_verbose && NULL != probe_for) 293 pr_cont("found\n"); 294 return buffer; 295 } 296 297 /* write I2C */ 298 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1, 299 unsigned char b2, int both) 300 { 301 unsigned char buffer[2]; 302 int bytes = both ? 2 : 1; 303 304 if (0 != btv->i2c_rc) 305 return -1; 306 btv->i2c_client.addr = addr >> 1; 307 buffer[0] = b1; 308 buffer[1] = b2; 309 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes)) 310 return -1; 311 return 0; 312 } 313 314 /* read EEPROM content */ 315 void bttv_readee(struct bttv *btv, unsigned char *eedata, int addr) 316 { 317 memset(eedata, 0, 256); 318 if (0 != btv->i2c_rc) 319 return; 320 btv->i2c_client.addr = addr >> 1; 321 tveeprom_read(&btv->i2c_client, eedata, 256); 322 } 323 324 static char *i2c_devs[128] = { 325 [ 0x1c >> 1 ] = "lgdt330x", 326 [ 0x30 >> 1 ] = "IR (hauppauge)", 327 [ 0x80 >> 1 ] = "msp34xx", 328 [ 0x86 >> 1 ] = "tda9887", 329 [ 0xa0 >> 1 ] = "eeprom", 330 [ 0xc0 >> 1 ] = "tuner (analog)", 331 [ 0xc2 >> 1 ] = "tuner (analog)", 332 }; 333 334 static void do_i2c_scan(char *name, struct i2c_client *c) 335 { 336 unsigned char buf; 337 int i,rc; 338 339 for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { 340 c->addr = i; 341 rc = i2c_master_recv(c,&buf,0); 342 if (rc < 0) 343 continue; 344 pr_info("%s: i2c scan: found device @ 0x%x [%s]\n", 345 name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); 346 } 347 } 348 349 /* init + register i2c adapter */ 350 int init_bttv_i2c(struct bttv *btv) 351 { 352 strlcpy(btv->i2c_client.name, "bttv internal", I2C_NAME_SIZE); 353 354 if (i2c_hw) 355 btv->use_i2c_hw = 1; 356 if (btv->use_i2c_hw) { 357 /* bt878 */ 358 strlcpy(btv->c.i2c_adap.name, "bt878", 359 sizeof(btv->c.i2c_adap.name)); 360 btv->c.i2c_adap.algo = &bttv_algo; 361 } else { 362 /* bt848 */ 363 /* Prevents usage of invalid delay values */ 364 if (i2c_udelay<5) 365 i2c_udelay=5; 366 367 strlcpy(btv->c.i2c_adap.name, "bttv", 368 sizeof(btv->c.i2c_adap.name)); 369 btv->i2c_algo = bttv_i2c_algo_bit_template; 370 btv->i2c_algo.udelay = i2c_udelay; 371 btv->i2c_algo.data = btv; 372 btv->c.i2c_adap.algo_data = &btv->i2c_algo; 373 } 374 btv->c.i2c_adap.owner = THIS_MODULE; 375 376 btv->c.i2c_adap.dev.parent = &btv->c.pci->dev; 377 snprintf(btv->c.i2c_adap.name, sizeof(btv->c.i2c_adap.name), 378 "bt%d #%d [%s]", btv->id, btv->c.nr, 379 btv->use_i2c_hw ? "hw" : "sw"); 380 381 i2c_set_adapdata(&btv->c.i2c_adap, &btv->c.v4l2_dev); 382 btv->i2c_client.adapter = &btv->c.i2c_adap; 383 384 385 if (btv->use_i2c_hw) { 386 btv->i2c_rc = i2c_add_adapter(&btv->c.i2c_adap); 387 } else { 388 bttv_bit_setscl(btv,1); 389 bttv_bit_setsda(btv,1); 390 btv->i2c_rc = i2c_bit_add_bus(&btv->c.i2c_adap); 391 } 392 if (0 == btv->i2c_rc && i2c_scan) 393 do_i2c_scan(btv->c.v4l2_dev.name, &btv->i2c_client); 394 395 return btv->i2c_rc; 396 } 397 398 int fini_bttv_i2c(struct bttv *btv) 399 { 400 if (btv->i2c_rc == 0) 401 i2c_del_adapter(&btv->c.i2c_adap); 402 403 return 0; 404 } 405