Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 1 | /* |
| 2 | I2C functions |
| 3 | Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> |
| 4 | Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | This file includes an i2c implementation that was reverse engineered |
| 23 | from the Hauppauge windows driver. Older ivtv versions used i2c-algo-bit, |
| 24 | which whilst fine under most circumstances, had trouble with the Zilog |
| 25 | CPU on the PVR-150 which handles IR functions (occasional inability to |
| 26 | communicate with the chip until it was reset) and also with the i2c |
| 27 | bus being completely unreachable when multiple PVR cards were present. |
| 28 | |
| 29 | The implementation is very similar to i2c-algo-bit, but there are enough |
| 30 | subtle differences that the two are hard to merge. The general strategy |
| 31 | employed by i2c-algo-bit is to use udelay() to implement the timing |
| 32 | when putting out bits on the scl/sda lines. The general strategy taken |
| 33 | here is to poll the lines for state changes (see ivtv_waitscl and |
| 34 | ivtv_waitsda). In addition there are small delays at various locations |
| 35 | which poll the SCL line 5 times (ivtv_scldelay). I would guess that |
| 36 | since this is memory mapped I/O that the length of those delays is tied |
| 37 | to the PCI bus clock. There is some extra code to do with recovery |
| 38 | and retries. Since it is not known what causes the actual i2c problems |
| 39 | in the first place, the only goal if one was to attempt to use |
| 40 | i2c-algo-bit would be to try to make it follow the same code path. |
| 41 | This would be a lot of work, and I'm also not convinced that it would |
| 42 | provide a generic benefit to i2c-algo-bit. Therefore consider this |
| 43 | an engineering solution -- not pretty, but it works. |
| 44 | |
| 45 | Some more general comments about what we are doing: |
| 46 | |
| 47 | The i2c bus is a 2 wire serial bus, with clock (SCL) and data (SDA) |
| 48 | lines. To communicate on the bus (as a master, we don't act as a slave), |
| 49 | we first initiate a start condition (ivtv_start). We then write the |
| 50 | address of the device that we want to communicate with, along with a flag |
| 51 | that indicates whether this is a read or a write. The slave then issues |
| 52 | an ACK signal (ivtv_ack), which tells us that it is ready for reading / |
| 53 | writing. We then proceed with reading or writing (ivtv_read/ivtv_write), |
| 54 | and finally issue a stop condition (ivtv_stop) to make the bus available |
| 55 | to other masters. |
| 56 | |
| 57 | There is an additional form of transaction where a write may be |
| 58 | immediately followed by a read. In this case, there is no intervening |
| 59 | stop condition. (Only the msp3400 chip uses this method of data transfer). |
| 60 | */ |
| 61 | |
| 62 | #include "ivtv-driver.h" |
| 63 | #include "ivtv-cards.h" |
| 64 | #include "ivtv-gpio.h" |
Hans Verkuil | 83df8e7 | 2007-03-10 06:54:58 -0300 | [diff] [blame] | 65 | #include "ivtv-i2c.h" |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 66 | |
| 67 | #include <media/ir-kbd-i2c.h> |
| 68 | |
| 69 | /* i2c implementation for cx23415/6 chip, ivtv project. |
| 70 | * Author: Kevin Thayer (nufan_wfk at yahoo.com) |
| 71 | */ |
| 72 | /* i2c stuff */ |
| 73 | #define IVTV_REG_I2C_SETSCL_OFFSET 0x7000 |
| 74 | #define IVTV_REG_I2C_SETSDA_OFFSET 0x7004 |
| 75 | #define IVTV_REG_I2C_GETSCL_OFFSET 0x7008 |
| 76 | #define IVTV_REG_I2C_GETSDA_OFFSET 0x700c |
| 77 | |
| 78 | #ifndef I2C_ADAP_CLASS_TV_ANALOG |
| 79 | #define I2C_ADAP_CLASS_TV_ANALOG I2C_CLASS_TV_ANALOG |
| 80 | #endif /* I2C_ADAP_CLASS_TV_ANALOG */ |
| 81 | |
| 82 | #define IVTV_CS53L32A_I2C_ADDR 0x11 |
| 83 | #define IVTV_CX25840_I2C_ADDR 0x44 |
| 84 | #define IVTV_SAA7115_I2C_ADDR 0x21 |
| 85 | #define IVTV_SAA7127_I2C_ADDR 0x44 |
| 86 | #define IVTV_SAA717x_I2C_ADDR 0x21 |
| 87 | #define IVTV_MSP3400_I2C_ADDR 0x40 |
| 88 | #define IVTV_HAUPPAUGE_I2C_ADDR 0x50 |
| 89 | #define IVTV_WM8739_I2C_ADDR 0x1a |
| 90 | #define IVTV_WM8775_I2C_ADDR 0x1b |
| 91 | #define IVTV_TEA5767_I2C_ADDR 0x60 |
| 92 | #define IVTV_UPD64031A_I2C_ADDR 0x12 |
| 93 | #define IVTV_UPD64083_I2C_ADDR 0x5c |
| 94 | #define IVTV_TDA985X_I2C_ADDR 0x5b |
| 95 | |
| 96 | /* This array should match the IVTV_HW_ defines */ |
| 97 | static const u8 hw_driverids[] = { |
| 98 | I2C_DRIVERID_CX25840, |
| 99 | I2C_DRIVERID_SAA711X, |
| 100 | I2C_DRIVERID_SAA7127, |
| 101 | I2C_DRIVERID_MSP3400, |
| 102 | I2C_DRIVERID_TUNER, |
| 103 | I2C_DRIVERID_WM8775, |
| 104 | I2C_DRIVERID_CS53L32A, |
| 105 | I2C_DRIVERID_TVEEPROM, |
| 106 | I2C_DRIVERID_SAA711X, |
| 107 | I2C_DRIVERID_TVAUDIO, |
| 108 | I2C_DRIVERID_UPD64031A, |
| 109 | I2C_DRIVERID_UPD64083, |
| 110 | I2C_DRIVERID_SAA717X, |
| 111 | I2C_DRIVERID_WM8739, |
Hans Verkuil | ac24743 | 2007-07-27 06:56:50 -0300 | [diff] [blame] | 112 | I2C_DRIVERID_VP27SMPX, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 113 | 0 /* IVTV_HW_GPIO dummy driver ID */ |
| 114 | }; |
| 115 | |
| 116 | /* This array should match the IVTV_HW_ defines */ |
| 117 | static const char * const hw_drivernames[] = { |
| 118 | "cx2584x", |
| 119 | "saa7115", |
| 120 | "saa7127", |
| 121 | "msp3400", |
| 122 | "tuner", |
| 123 | "wm8775", |
| 124 | "cs53l32a", |
| 125 | "tveeprom", |
| 126 | "saa7114", |
| 127 | "tvaudio", |
| 128 | "upd64031a", |
| 129 | "upd64083", |
| 130 | "saa717x", |
| 131 | "wm8739", |
Hans Verkuil | ac24743 | 2007-07-27 06:56:50 -0300 | [diff] [blame] | 132 | "vp27smpx", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 133 | "gpio", |
| 134 | }; |
| 135 | |
| 136 | static int attach_inform(struct i2c_client *client) |
| 137 | { |
| 138 | struct ivtv *itv = (struct ivtv *)i2c_get_adapdata(client->adapter); |
| 139 | int i; |
| 140 | |
| 141 | IVTV_DEBUG_I2C("i2c client attach\n"); |
| 142 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 143 | if (itv->i2c_clients[i] == NULL) { |
| 144 | itv->i2c_clients[i] = client; |
| 145 | break; |
| 146 | } |
| 147 | } |
| 148 | if (i == I2C_CLIENTS_MAX) { |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 149 | IVTV_ERR("Insufficient room for new I2C client\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 150 | } |
| 151 | return 0; |
| 152 | } |
| 153 | |
| 154 | static int detach_inform(struct i2c_client *client) |
| 155 | { |
| 156 | int i; |
| 157 | struct ivtv *itv = (struct ivtv *)i2c_get_adapdata(client->adapter); |
| 158 | |
| 159 | IVTV_DEBUG_I2C("i2c client detach\n"); |
| 160 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 161 | if (itv->i2c_clients[i] == client) { |
| 162 | itv->i2c_clients[i] = NULL; |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | IVTV_DEBUG_I2C("i2c detach [client=%s,%s]\n", |
| 167 | client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed"); |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | /* Set the serial clock line to the desired state */ |
| 173 | static void ivtv_setscl(struct ivtv *itv, int state) |
| 174 | { |
| 175 | /* write them out */ |
| 176 | /* write bits are inverted */ |
| 177 | write_reg(~state, IVTV_REG_I2C_SETSCL_OFFSET); |
| 178 | } |
| 179 | |
| 180 | /* Set the serial data line to the desired state */ |
| 181 | static void ivtv_setsda(struct ivtv *itv, int state) |
| 182 | { |
| 183 | /* write them out */ |
| 184 | /* write bits are inverted */ |
| 185 | write_reg(~state & 1, IVTV_REG_I2C_SETSDA_OFFSET); |
| 186 | } |
| 187 | |
| 188 | /* Read the serial clock line */ |
| 189 | static int ivtv_getscl(struct ivtv *itv) |
| 190 | { |
| 191 | return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; |
| 192 | } |
| 193 | |
| 194 | /* Read the serial data line */ |
| 195 | static int ivtv_getsda(struct ivtv *itv) |
| 196 | { |
| 197 | return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; |
| 198 | } |
| 199 | |
| 200 | /* Implement a short delay by polling the serial clock line */ |
| 201 | static void ivtv_scldelay(struct ivtv *itv) |
| 202 | { |
| 203 | int i; |
| 204 | |
| 205 | for (i = 0; i < 5; ++i) |
| 206 | ivtv_getscl(itv); |
| 207 | } |
| 208 | |
| 209 | /* Wait for the serial clock line to become set to a specific value */ |
| 210 | static int ivtv_waitscl(struct ivtv *itv, int val) |
| 211 | { |
| 212 | int i; |
| 213 | |
| 214 | ivtv_scldelay(itv); |
| 215 | for (i = 0; i < 1000; ++i) { |
| 216 | if (ivtv_getscl(itv) == val) |
| 217 | return 1; |
| 218 | } |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /* Wait for the serial data line to become set to a specific value */ |
| 223 | static int ivtv_waitsda(struct ivtv *itv, int val) |
| 224 | { |
| 225 | int i; |
| 226 | |
| 227 | ivtv_scldelay(itv); |
| 228 | for (i = 0; i < 1000; ++i) { |
| 229 | if (ivtv_getsda(itv) == val) |
| 230 | return 1; |
| 231 | } |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | /* Wait for the slave to issue an ACK */ |
| 236 | static int ivtv_ack(struct ivtv *itv) |
| 237 | { |
| 238 | int ret = 0; |
| 239 | |
| 240 | if (ivtv_getscl(itv) == 1) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 241 | IVTV_DEBUG_HI_I2C("SCL was high starting an ack\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 242 | ivtv_setscl(itv, 0); |
| 243 | if (!ivtv_waitscl(itv, 0)) { |
| 244 | IVTV_DEBUG_I2C("Could not set SCL low starting an ack\n"); |
| 245 | return -EREMOTEIO; |
| 246 | } |
| 247 | } |
| 248 | ivtv_setsda(itv, 1); |
| 249 | ivtv_scldelay(itv); |
| 250 | ivtv_setscl(itv, 1); |
| 251 | if (!ivtv_waitsda(itv, 0)) { |
| 252 | IVTV_DEBUG_I2C("Slave did not ack\n"); |
| 253 | ret = -EREMOTEIO; |
| 254 | } |
| 255 | ivtv_setscl(itv, 0); |
| 256 | if (!ivtv_waitscl(itv, 0)) { |
| 257 | IVTV_DEBUG_I2C("Failed to set SCL low after ACK\n"); |
| 258 | ret = -EREMOTEIO; |
| 259 | } |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | /* Write a single byte to the i2c bus and wait for the slave to ACK */ |
| 264 | static int ivtv_sendbyte(struct ivtv *itv, unsigned char byte) |
| 265 | { |
| 266 | int i, bit; |
| 267 | |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 268 | IVTV_DEBUG_HI_I2C("write %x\n",byte); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 269 | for (i = 0; i < 8; ++i, byte<<=1) { |
| 270 | ivtv_setscl(itv, 0); |
| 271 | if (!ivtv_waitscl(itv, 0)) { |
| 272 | IVTV_DEBUG_I2C("Error setting SCL low\n"); |
| 273 | return -EREMOTEIO; |
| 274 | } |
| 275 | bit = (byte>>7)&1; |
| 276 | ivtv_setsda(itv, bit); |
| 277 | if (!ivtv_waitsda(itv, bit)) { |
| 278 | IVTV_DEBUG_I2C("Error setting SDA\n"); |
| 279 | return -EREMOTEIO; |
| 280 | } |
| 281 | ivtv_setscl(itv, 1); |
| 282 | if (!ivtv_waitscl(itv, 1)) { |
| 283 | IVTV_DEBUG_I2C("Slave not ready for bit\n"); |
| 284 | return -EREMOTEIO; |
| 285 | } |
| 286 | } |
| 287 | ivtv_setscl(itv, 0); |
| 288 | if (!ivtv_waitscl(itv, 0)) { |
| 289 | IVTV_DEBUG_I2C("Error setting SCL low\n"); |
| 290 | return -EREMOTEIO; |
| 291 | } |
| 292 | return ivtv_ack(itv); |
| 293 | } |
| 294 | |
| 295 | /* Read a byte from the i2c bus and send a NACK if applicable (i.e. for the |
| 296 | final byte) */ |
| 297 | static int ivtv_readbyte(struct ivtv *itv, unsigned char *byte, int nack) |
| 298 | { |
| 299 | int i; |
| 300 | |
| 301 | *byte = 0; |
| 302 | |
| 303 | ivtv_setsda(itv, 1); |
| 304 | ivtv_scldelay(itv); |
| 305 | for (i = 0; i < 8; ++i) { |
| 306 | ivtv_setscl(itv, 0); |
| 307 | ivtv_scldelay(itv); |
| 308 | ivtv_setscl(itv, 1); |
| 309 | if (!ivtv_waitscl(itv, 1)) { |
| 310 | IVTV_DEBUG_I2C("Error setting SCL high\n"); |
| 311 | return -EREMOTEIO; |
| 312 | } |
| 313 | *byte = ((*byte)<<1)|ivtv_getsda(itv); |
| 314 | } |
| 315 | ivtv_setscl(itv, 0); |
| 316 | ivtv_scldelay(itv); |
| 317 | ivtv_setsda(itv, nack); |
| 318 | ivtv_scldelay(itv); |
| 319 | ivtv_setscl(itv, 1); |
| 320 | ivtv_scldelay(itv); |
| 321 | ivtv_setscl(itv, 0); |
| 322 | ivtv_scldelay(itv); |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 323 | IVTV_DEBUG_HI_I2C("read %x\n",*byte); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | /* Issue a start condition on the i2c bus to alert slaves to prepare for |
| 328 | an address write */ |
| 329 | static int ivtv_start(struct ivtv *itv) |
| 330 | { |
| 331 | int sda; |
| 332 | |
| 333 | sda = ivtv_getsda(itv); |
| 334 | if (sda != 1) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 335 | IVTV_DEBUG_HI_I2C("SDA was low at start\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 336 | ivtv_setsda(itv, 1); |
| 337 | if (!ivtv_waitsda(itv, 1)) { |
| 338 | IVTV_DEBUG_I2C("SDA stuck low\n"); |
| 339 | return -EREMOTEIO; |
| 340 | } |
| 341 | } |
| 342 | if (ivtv_getscl(itv) != 1) { |
| 343 | ivtv_setscl(itv, 1); |
| 344 | if (!ivtv_waitscl(itv, 1)) { |
| 345 | IVTV_DEBUG_I2C("SCL stuck low at start\n"); |
| 346 | return -EREMOTEIO; |
| 347 | } |
| 348 | } |
| 349 | ivtv_setsda(itv, 0); |
| 350 | ivtv_scldelay(itv); |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | /* Issue a stop condition on the i2c bus to release it */ |
| 355 | static int ivtv_stop(struct ivtv *itv) |
| 356 | { |
| 357 | int i; |
| 358 | |
| 359 | if (ivtv_getscl(itv) != 0) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 360 | IVTV_DEBUG_HI_I2C("SCL not low when stopping\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 361 | ivtv_setscl(itv, 0); |
| 362 | if (!ivtv_waitscl(itv, 0)) { |
| 363 | IVTV_DEBUG_I2C("SCL could not be set low\n"); |
| 364 | } |
| 365 | } |
| 366 | ivtv_setsda(itv, 0); |
| 367 | ivtv_scldelay(itv); |
| 368 | ivtv_setscl(itv, 1); |
| 369 | if (!ivtv_waitscl(itv, 1)) { |
| 370 | IVTV_DEBUG_I2C("SCL could not be set high\n"); |
| 371 | return -EREMOTEIO; |
| 372 | } |
| 373 | ivtv_scldelay(itv); |
| 374 | ivtv_setsda(itv, 1); |
| 375 | if (!ivtv_waitsda(itv, 1)) { |
| 376 | IVTV_DEBUG_I2C("resetting I2C\n"); |
| 377 | for (i = 0; i < 16; ++i) { |
| 378 | ivtv_setscl(itv, 0); |
| 379 | ivtv_scldelay(itv); |
| 380 | ivtv_setscl(itv, 1); |
| 381 | ivtv_scldelay(itv); |
| 382 | ivtv_setsda(itv, 1); |
| 383 | } |
| 384 | ivtv_waitsda(itv, 1); |
| 385 | return -EREMOTEIO; |
| 386 | } |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | /* Write a message to the given i2c slave. do_stop may be 0 to prevent |
| 391 | issuing the i2c stop condition (when following with a read) */ |
| 392 | static int ivtv_write(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len, int do_stop) |
| 393 | { |
| 394 | int retry, ret = -EREMOTEIO; |
| 395 | u32 i; |
| 396 | |
| 397 | for (retry = 0; ret != 0 && retry < 8; ++retry) { |
| 398 | ret = ivtv_start(itv); |
| 399 | |
| 400 | if (ret == 0) { |
| 401 | ret = ivtv_sendbyte(itv, addr<<1); |
| 402 | for (i = 0; ret == 0 && i < len; ++i) |
| 403 | ret = ivtv_sendbyte(itv, data[i]); |
| 404 | } |
| 405 | if (ret != 0 || do_stop) { |
| 406 | ivtv_stop(itv); |
| 407 | } |
| 408 | } |
| 409 | if (ret) |
| 410 | IVTV_DEBUG_I2C("i2c write to %x failed\n", addr); |
| 411 | return ret; |
| 412 | } |
| 413 | |
| 414 | /* Read data from the given i2c slave. A stop condition is always issued. */ |
| 415 | static int ivtv_read(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len) |
| 416 | { |
| 417 | int retry, ret = -EREMOTEIO; |
| 418 | u32 i; |
| 419 | |
| 420 | for (retry = 0; ret != 0 && retry < 8; ++retry) { |
| 421 | ret = ivtv_start(itv); |
| 422 | if (ret == 0) |
| 423 | ret = ivtv_sendbyte(itv, (addr << 1) | 1); |
| 424 | for (i = 0; ret == 0 && i < len; ++i) { |
| 425 | ret = ivtv_readbyte(itv, &data[i], i == len - 1); |
| 426 | } |
| 427 | ivtv_stop(itv); |
| 428 | } |
| 429 | if (ret) |
| 430 | IVTV_DEBUG_I2C("i2c read from %x failed\n", addr); |
| 431 | return ret; |
| 432 | } |
| 433 | |
| 434 | /* Kernel i2c transfer implementation. Takes a number of messages to be read |
| 435 | or written. If a read follows a write, this will occur without an |
| 436 | intervening stop condition */ |
| 437 | static int ivtv_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) |
| 438 | { |
| 439 | struct ivtv *itv = i2c_get_adapdata(i2c_adap); |
| 440 | int retval; |
| 441 | int i; |
| 442 | |
| 443 | mutex_lock(&itv->i2c_bus_lock); |
| 444 | for (i = retval = 0; retval == 0 && i < num; i++) { |
| 445 | if (msgs[i].flags & I2C_M_RD) |
| 446 | retval = ivtv_read(itv, msgs[i].addr, msgs[i].buf, msgs[i].len); |
| 447 | else { |
| 448 | /* if followed by a read, don't stop */ |
| 449 | int stop = !(i + 1 < num && msgs[i + 1].flags == I2C_M_RD); |
| 450 | |
| 451 | retval = ivtv_write(itv, msgs[i].addr, msgs[i].buf, msgs[i].len, stop); |
| 452 | } |
| 453 | } |
| 454 | mutex_unlock(&itv->i2c_bus_lock); |
| 455 | return retval ? retval : num; |
| 456 | } |
| 457 | |
| 458 | /* Kernel i2c capabilities */ |
| 459 | static u32 ivtv_functionality(struct i2c_adapter *adap) |
| 460 | { |
| 461 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 462 | } |
| 463 | |
| 464 | static struct i2c_algorithm ivtv_algo = { |
| 465 | .master_xfer = ivtv_xfer, |
| 466 | .functionality = ivtv_functionality, |
| 467 | }; |
| 468 | |
| 469 | /* template for our-bit banger */ |
| 470 | static struct i2c_adapter ivtv_i2c_adap_hw_template = { |
| 471 | .name = "ivtv i2c driver", |
| 472 | .id = I2C_HW_B_CX2341X, |
| 473 | .algo = &ivtv_algo, |
| 474 | .algo_data = NULL, /* filled from template */ |
| 475 | .client_register = attach_inform, |
| 476 | .client_unregister = detach_inform, |
| 477 | .owner = THIS_MODULE, |
| 478 | #ifdef I2C_ADAP_CLASS_TV_ANALOG |
| 479 | .class = I2C_ADAP_CLASS_TV_ANALOG, |
| 480 | #endif |
| 481 | }; |
| 482 | |
| 483 | static void ivtv_setscl_old(void *data, int state) |
| 484 | { |
| 485 | struct ivtv *itv = (struct ivtv *)data; |
| 486 | |
| 487 | if (state) |
| 488 | itv->i2c_state |= 0x01; |
| 489 | else |
| 490 | itv->i2c_state &= ~0x01; |
| 491 | |
| 492 | /* write them out */ |
| 493 | /* write bits are inverted */ |
| 494 | write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSCL_OFFSET); |
| 495 | } |
| 496 | |
| 497 | static void ivtv_setsda_old(void *data, int state) |
| 498 | { |
| 499 | struct ivtv *itv = (struct ivtv *)data; |
| 500 | |
| 501 | if (state) |
| 502 | itv->i2c_state |= 0x01; |
| 503 | else |
| 504 | itv->i2c_state &= ~0x01; |
| 505 | |
| 506 | /* write them out */ |
| 507 | /* write bits are inverted */ |
| 508 | write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSDA_OFFSET); |
| 509 | } |
| 510 | |
| 511 | static int ivtv_getscl_old(void *data) |
| 512 | { |
| 513 | struct ivtv *itv = (struct ivtv *)data; |
| 514 | |
| 515 | return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; |
| 516 | } |
| 517 | |
| 518 | static int ivtv_getsda_old(void *data) |
| 519 | { |
| 520 | struct ivtv *itv = (struct ivtv *)data; |
| 521 | |
| 522 | return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; |
| 523 | } |
| 524 | |
| 525 | /* template for i2c-bit-algo */ |
| 526 | static struct i2c_adapter ivtv_i2c_adap_template = { |
| 527 | .name = "ivtv i2c driver", |
| 528 | .id = I2C_HW_B_CX2341X, /* algo-bit is OR'd with this */ |
| 529 | .algo = NULL, /* set by i2c-algo-bit */ |
| 530 | .algo_data = NULL, /* filled from template */ |
| 531 | .client_register = attach_inform, |
| 532 | .client_unregister = detach_inform, |
| 533 | .owner = THIS_MODULE, |
| 534 | #ifdef I2C_ADAP_CLASS_TV_ANALOG |
| 535 | .class = I2C_ADAP_CLASS_TV_ANALOG, |
| 536 | #endif |
| 537 | }; |
| 538 | |
Jean Delvare | aeb292d | 2007-08-23 15:45:41 -0300 | [diff] [blame] | 539 | static const struct i2c_algo_bit_data ivtv_i2c_algo_template = { |
| 540 | .setsda = ivtv_setsda_old, |
| 541 | .setscl = ivtv_setscl_old, |
| 542 | .getsda = ivtv_getsda_old, |
| 543 | .getscl = ivtv_getscl_old, |
Hans Verkuil | 49ebf14 | 2007-08-26 10:54:14 -0300 | [diff] [blame] | 544 | .udelay = 5, |
Jean Delvare | aeb292d | 2007-08-23 15:45:41 -0300 | [diff] [blame] | 545 | .timeout = 200, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 546 | }; |
| 547 | |
| 548 | static struct i2c_client ivtv_i2c_client_template = { |
Andrew Morton | a415783 | 2007-03-07 11:28:33 -0300 | [diff] [blame] | 549 | .name = "ivtv internal", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 550 | }; |
| 551 | |
| 552 | int ivtv_call_i2c_client(struct ivtv *itv, int addr, unsigned int cmd, void *arg) |
| 553 | { |
| 554 | struct i2c_client *client; |
| 555 | int retval; |
| 556 | int i; |
| 557 | |
| 558 | IVTV_DEBUG_I2C("call_i2c_client addr=%02x\n", addr); |
| 559 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 560 | client = itv->i2c_clients[i]; |
| 561 | if (client == NULL) { |
| 562 | continue; |
| 563 | } |
| 564 | if (client->driver->command == NULL) { |
| 565 | continue; |
| 566 | } |
| 567 | if (addr == client->addr) { |
| 568 | retval = client->driver->command(client, cmd, arg); |
| 569 | return retval; |
| 570 | } |
| 571 | } |
Hans Verkuil | 51dec1f | 2007-04-27 12:31:27 -0300 | [diff] [blame] | 572 | if (cmd != VIDIOC_G_CHIP_IDENT) |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 573 | IVTV_ERR("i2c addr 0x%02x not found for command 0x%x\n", addr, cmd); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 574 | return -ENODEV; |
| 575 | } |
| 576 | |
| 577 | /* Find the i2c device based on the driver ID and return |
| 578 | its i2c address or -ENODEV if no matching device was found. */ |
Hans Verkuil | 31ec135 | 2007-03-03 08:50:42 -0300 | [diff] [blame] | 579 | static int ivtv_i2c_id_addr(struct ivtv *itv, u32 id) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 580 | { |
| 581 | struct i2c_client *client; |
| 582 | int retval = -ENODEV; |
| 583 | int i; |
| 584 | |
| 585 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 586 | client = itv->i2c_clients[i]; |
| 587 | if (client == NULL) |
| 588 | continue; |
| 589 | if (id == client->driver->id) { |
| 590 | retval = client->addr; |
| 591 | break; |
| 592 | } |
| 593 | } |
| 594 | return retval; |
| 595 | } |
| 596 | |
| 597 | /* Find the i2c device name matching the DRIVERID */ |
| 598 | static const char *ivtv_i2c_id_name(u32 id) |
| 599 | { |
| 600 | int i; |
| 601 | |
| 602 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 603 | if (hw_driverids[i] == id) |
| 604 | return hw_drivernames[i]; |
| 605 | return "unknown device"; |
| 606 | } |
| 607 | |
| 608 | /* Find the i2c device name matching the IVTV_HW_ flag */ |
| 609 | static const char *ivtv_i2c_hw_name(u32 hw) |
| 610 | { |
| 611 | int i; |
| 612 | |
| 613 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 614 | if (1 << i == hw) |
| 615 | return hw_drivernames[i]; |
| 616 | return "unknown device"; |
| 617 | } |
| 618 | |
| 619 | /* Find the i2c device matching the IVTV_HW_ flag and return |
| 620 | its i2c address or -ENODEV if no matching device was found. */ |
| 621 | int ivtv_i2c_hw_addr(struct ivtv *itv, u32 hw) |
| 622 | { |
| 623 | int i; |
| 624 | |
| 625 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 626 | if (1 << i == hw) |
| 627 | return ivtv_i2c_id_addr(itv, hw_driverids[i]); |
| 628 | return -ENODEV; |
| 629 | } |
| 630 | |
| 631 | /* Calls i2c device based on IVTV_HW_ flag. If hw == 0, then do nothing. |
| 632 | If hw == IVTV_HW_GPIO then call the gpio handler. */ |
| 633 | int ivtv_i2c_hw(struct ivtv *itv, u32 hw, unsigned int cmd, void *arg) |
| 634 | { |
| 635 | int addr; |
| 636 | |
| 637 | if (hw == IVTV_HW_GPIO) |
| 638 | return ivtv_gpio(itv, cmd, arg); |
| 639 | if (hw == 0) |
| 640 | return 0; |
| 641 | |
| 642 | addr = ivtv_i2c_hw_addr(itv, hw); |
| 643 | if (addr < 0) { |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 644 | IVTV_ERR("i2c hardware 0x%08x (%s) not found for command 0x%x\n", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 645 | hw, ivtv_i2c_hw_name(hw), cmd); |
| 646 | return addr; |
| 647 | } |
| 648 | return ivtv_call_i2c_client(itv, addr, cmd, arg); |
| 649 | } |
| 650 | |
| 651 | /* Calls i2c device based on I2C driver ID. */ |
| 652 | int ivtv_i2c_id(struct ivtv *itv, u32 id, unsigned int cmd, void *arg) |
| 653 | { |
| 654 | int addr; |
| 655 | |
| 656 | addr = ivtv_i2c_id_addr(itv, id); |
| 657 | if (addr < 0) { |
Hans Verkuil | 51dec1f | 2007-04-27 12:31:27 -0300 | [diff] [blame] | 658 | if (cmd != VIDIOC_G_CHIP_IDENT) |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 659 | IVTV_ERR("i2c ID 0x%08x (%s) not found for command 0x%x\n", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 660 | id, ivtv_i2c_id_name(id), cmd); |
| 661 | return addr; |
| 662 | } |
| 663 | return ivtv_call_i2c_client(itv, addr, cmd, arg); |
| 664 | } |
| 665 | |
| 666 | int ivtv_cx25840(struct ivtv *itv, unsigned int cmd, void *arg) |
| 667 | { |
| 668 | return ivtv_call_i2c_client(itv, IVTV_CX25840_I2C_ADDR, cmd, arg); |
| 669 | } |
| 670 | |
| 671 | int ivtv_saa7115(struct ivtv *itv, unsigned int cmd, void *arg) |
| 672 | { |
| 673 | return ivtv_call_i2c_client(itv, IVTV_SAA7115_I2C_ADDR, cmd, arg); |
| 674 | } |
| 675 | |
| 676 | int ivtv_saa7127(struct ivtv *itv, unsigned int cmd, void *arg) |
| 677 | { |
| 678 | return ivtv_call_i2c_client(itv, IVTV_SAA7127_I2C_ADDR, cmd, arg); |
| 679 | } |
| 680 | |
| 681 | int ivtv_saa717x(struct ivtv *itv, unsigned int cmd, void *arg) |
| 682 | { |
| 683 | return ivtv_call_i2c_client(itv, IVTV_SAA717x_I2C_ADDR, cmd, arg); |
| 684 | } |
| 685 | |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 686 | int ivtv_upd64031a(struct ivtv *itv, unsigned int cmd, void *arg) |
| 687 | { |
| 688 | return ivtv_call_i2c_client(itv, IVTV_UPD64031A_I2C_ADDR, cmd, arg); |
| 689 | } |
| 690 | |
| 691 | int ivtv_upd64083(struct ivtv *itv, unsigned int cmd, void *arg) |
| 692 | { |
| 693 | return ivtv_call_i2c_client(itv, IVTV_UPD64083_I2C_ADDR, cmd, arg); |
| 694 | } |
| 695 | |
| 696 | /* broadcast cmd for all I2C clients and for the gpio subsystem */ |
| 697 | void ivtv_call_i2c_clients(struct ivtv *itv, unsigned int cmd, void *arg) |
| 698 | { |
| 699 | if (itv->i2c_adap.algo == NULL) { |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 700 | IVTV_ERR("Adapter is not set"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 701 | return; |
| 702 | } |
| 703 | i2c_clients_command(&itv->i2c_adap, cmd, arg); |
| 704 | if (itv->hw_flags & IVTV_HW_GPIO) |
| 705 | ivtv_gpio(itv, cmd, arg); |
| 706 | } |
| 707 | |
| 708 | /* init + register i2c algo-bit adapter */ |
| 709 | int __devinit init_ivtv_i2c(struct ivtv *itv) |
| 710 | { |
| 711 | IVTV_DEBUG_I2C("i2c init\n"); |
| 712 | |
| 713 | if (itv->options.newi2c > 0) { |
| 714 | memcpy(&itv->i2c_adap, &ivtv_i2c_adap_hw_template, |
| 715 | sizeof(struct i2c_adapter)); |
| 716 | } else { |
| 717 | memcpy(&itv->i2c_adap, &ivtv_i2c_adap_template, |
| 718 | sizeof(struct i2c_adapter)); |
| 719 | memcpy(&itv->i2c_algo, &ivtv_i2c_algo_template, |
| 720 | sizeof(struct i2c_algo_bit_data)); |
| 721 | itv->i2c_algo.data = itv; |
| 722 | itv->i2c_adap.algo_data = &itv->i2c_algo; |
| 723 | } |
| 724 | |
| 725 | sprintf(itv->i2c_adap.name + strlen(itv->i2c_adap.name), " #%d", |
| 726 | itv->num); |
| 727 | i2c_set_adapdata(&itv->i2c_adap, itv); |
| 728 | |
| 729 | memcpy(&itv->i2c_client, &ivtv_i2c_client_template, |
| 730 | sizeof(struct i2c_client)); |
| 731 | itv->i2c_client.adapter = &itv->i2c_adap; |
| 732 | itv->i2c_adap.dev.parent = &itv->dev->dev; |
| 733 | |
| 734 | IVTV_DEBUG_I2C("setting scl and sda to 1\n"); |
| 735 | ivtv_setscl(itv, 1); |
| 736 | ivtv_setsda(itv, 1); |
| 737 | |
| 738 | if (itv->options.newi2c > 0) |
| 739 | return i2c_add_adapter(&itv->i2c_adap); |
| 740 | else |
| 741 | return i2c_bit_add_bus(&itv->i2c_adap); |
| 742 | } |
| 743 | |
| 744 | void __devexit exit_ivtv_i2c(struct ivtv *itv) |
| 745 | { |
| 746 | IVTV_DEBUG_I2C("i2c exit\n"); |
| 747 | |
| 748 | i2c_del_adapter(&itv->i2c_adap); |
| 749 | } |