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 | |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 78 | #define IVTV_CS53L32A_I2C_ADDR 0x11 |
Hans Verkuil | e2a1774 | 2007-10-30 05:50:03 -0300 | [diff] [blame] | 79 | #define IVTV_M52790_I2C_ADDR 0x48 |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 80 | #define IVTV_CX25840_I2C_ADDR 0x44 |
| 81 | #define IVTV_SAA7115_I2C_ADDR 0x21 |
| 82 | #define IVTV_SAA7127_I2C_ADDR 0x44 |
| 83 | #define IVTV_SAA717x_I2C_ADDR 0x21 |
| 84 | #define IVTV_MSP3400_I2C_ADDR 0x40 |
| 85 | #define IVTV_HAUPPAUGE_I2C_ADDR 0x50 |
| 86 | #define IVTV_WM8739_I2C_ADDR 0x1a |
| 87 | #define IVTV_WM8775_I2C_ADDR 0x1b |
| 88 | #define IVTV_TEA5767_I2C_ADDR 0x60 |
| 89 | #define IVTV_UPD64031A_I2C_ADDR 0x12 |
| 90 | #define IVTV_UPD64083_I2C_ADDR 0x5c |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 91 | #define IVTV_VP27SMPX_I2C_ADDR 0x5b |
| 92 | #define IVTV_M52790_I2C_ADDR 0x48 |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 93 | |
| 94 | /* This array should match the IVTV_HW_ defines */ |
| 95 | static const u8 hw_driverids[] = { |
| 96 | I2C_DRIVERID_CX25840, |
| 97 | I2C_DRIVERID_SAA711X, |
| 98 | I2C_DRIVERID_SAA7127, |
| 99 | I2C_DRIVERID_MSP3400, |
| 100 | I2C_DRIVERID_TUNER, |
| 101 | I2C_DRIVERID_WM8775, |
| 102 | I2C_DRIVERID_CS53L32A, |
| 103 | I2C_DRIVERID_TVEEPROM, |
| 104 | I2C_DRIVERID_SAA711X, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 105 | I2C_DRIVERID_UPD64031A, |
| 106 | I2C_DRIVERID_UPD64083, |
| 107 | I2C_DRIVERID_SAA717X, |
| 108 | I2C_DRIVERID_WM8739, |
Hans Verkuil | ac24743 | 2007-07-27 06:56:50 -0300 | [diff] [blame] | 109 | I2C_DRIVERID_VP27SMPX, |
Hans Verkuil | e2a1774 | 2007-10-30 05:50:03 -0300 | [diff] [blame] | 110 | I2C_DRIVERID_M52790, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 111 | 0 /* IVTV_HW_GPIO dummy driver ID */ |
| 112 | }; |
| 113 | |
| 114 | /* This array should match the IVTV_HW_ defines */ |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 115 | static const u8 hw_addrs[] = { |
| 116 | IVTV_CX25840_I2C_ADDR, |
| 117 | IVTV_SAA7115_I2C_ADDR, |
| 118 | IVTV_SAA7127_I2C_ADDR, |
| 119 | IVTV_MSP3400_I2C_ADDR, |
| 120 | 0, |
| 121 | IVTV_WM8775_I2C_ADDR, |
| 122 | IVTV_CS53L32A_I2C_ADDR, |
| 123 | 0, |
| 124 | IVTV_SAA7115_I2C_ADDR, |
| 125 | IVTV_UPD64031A_I2C_ADDR, |
| 126 | IVTV_UPD64083_I2C_ADDR, |
| 127 | IVTV_SAA717x_I2C_ADDR, |
| 128 | IVTV_WM8739_I2C_ADDR, |
| 129 | IVTV_VP27SMPX_I2C_ADDR, |
| 130 | IVTV_M52790_I2C_ADDR, |
| 131 | 0 /* IVTV_HW_GPIO dummy driver ID */ |
| 132 | }; |
| 133 | |
| 134 | /* This array should match the IVTV_HW_ defines */ |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 135 | static const char * const hw_devicenames[] = { |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 136 | "cx25840", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 137 | "saa7115", |
Jean Delvare | 5daed07 | 2008-07-17 13:18:31 -0300 | [diff] [blame] | 138 | "saa7127_auto", /* saa7127 or saa7129 */ |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 139 | "msp3400", |
| 140 | "tuner", |
| 141 | "wm8775", |
| 142 | "cs53l32a", |
| 143 | "tveeprom", |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 144 | "saa7114", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 145 | "upd64031a", |
| 146 | "upd64083", |
| 147 | "saa717x", |
| 148 | "wm8739", |
Hans Verkuil | ac24743 | 2007-07-27 06:56:50 -0300 | [diff] [blame] | 149 | "vp27smpx", |
Hans Verkuil | e2a1774 | 2007-10-30 05:50:03 -0300 | [diff] [blame] | 150 | "m52790", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 151 | "gpio", |
| 152 | }; |
| 153 | |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 154 | int ivtv_i2c_register(struct ivtv *itv, unsigned idx) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 155 | { |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 156 | struct i2c_board_info info; |
| 157 | struct i2c_client *c; |
| 158 | u8 id; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 159 | int i; |
| 160 | |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 161 | IVTV_DEBUG_I2C("i2c client register\n"); |
| 162 | if (idx >= ARRAY_SIZE(hw_driverids) || hw_driverids[idx] == 0) |
| 163 | return -1; |
| 164 | id = hw_driverids[idx]; |
| 165 | memset(&info, 0, sizeof(info)); |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 166 | strlcpy(info.type, hw_devicenames[idx], sizeof(info.type)); |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 167 | info.addr = hw_addrs[idx]; |
| 168 | for (i = 0; itv->i2c_clients[i] && i < I2C_CLIENTS_MAX; i++) {} |
| 169 | |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 170 | if (i == I2C_CLIENTS_MAX) { |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 171 | IVTV_ERR("insufficient room for new I2C client!\n"); |
| 172 | return -ENOMEM; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 173 | } |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 174 | |
| 175 | if (id != I2C_DRIVERID_TUNER) { |
Hans Verkuil | b38bf41 | 2008-04-07 08:32:14 -0300 | [diff] [blame] | 176 | if (id == I2C_DRIVERID_UPD64031A || |
| 177 | id == I2C_DRIVERID_UPD64083) { |
| 178 | unsigned short addrs[2] = { info.addr, I2C_CLIENT_END }; |
| 179 | |
| 180 | c = i2c_new_probed_device(&itv->i2c_adap, &info, addrs); |
| 181 | } else |
| 182 | c = i2c_new_device(&itv->i2c_adap, &info); |
| 183 | if (c && c->driver == NULL) |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 184 | i2c_unregister_device(c); |
Hans Verkuil | b38bf41 | 2008-04-07 08:32:14 -0300 | [diff] [blame] | 185 | else if (c) |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 186 | itv->i2c_clients[i] = c; |
| 187 | return itv->i2c_clients[i] ? 0 : -ENODEV; |
| 188 | } |
| 189 | |
| 190 | /* special tuner handling */ |
| 191 | c = i2c_new_probed_device(&itv->i2c_adap, &info, itv->card_i2c->radio); |
| 192 | if (c && c->driver == NULL) |
| 193 | i2c_unregister_device(c); |
| 194 | else if (c) |
| 195 | itv->i2c_clients[i++] = c; |
| 196 | c = i2c_new_probed_device(&itv->i2c_adap, &info, itv->card_i2c->demod); |
| 197 | if (c && c->driver == NULL) |
| 198 | i2c_unregister_device(c); |
| 199 | else if (c) |
| 200 | itv->i2c_clients[i++] = c; |
| 201 | c = i2c_new_probed_device(&itv->i2c_adap, &info, itv->card_i2c->tv); |
| 202 | if (c && c->driver == NULL) |
| 203 | i2c_unregister_device(c); |
| 204 | else if (c) |
| 205 | itv->i2c_clients[i++] = c; |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static int attach_inform(struct i2c_client *client) |
| 210 | { |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static int detach_inform(struct i2c_client *client) |
| 215 | { |
| 216 | int i; |
| 217 | struct ivtv *itv = (struct ivtv *)i2c_get_adapdata(client->adapter); |
| 218 | |
| 219 | IVTV_DEBUG_I2C("i2c client detach\n"); |
| 220 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 221 | if (itv->i2c_clients[i] == client) { |
| 222 | itv->i2c_clients[i] = NULL; |
| 223 | break; |
| 224 | } |
| 225 | } |
| 226 | IVTV_DEBUG_I2C("i2c detach [client=%s,%s]\n", |
| 227 | client->name, (i < I2C_CLIENTS_MAX) ? "ok" : "failed"); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* Set the serial clock line to the desired state */ |
| 233 | static void ivtv_setscl(struct ivtv *itv, int state) |
| 234 | { |
| 235 | /* write them out */ |
| 236 | /* write bits are inverted */ |
| 237 | write_reg(~state, IVTV_REG_I2C_SETSCL_OFFSET); |
| 238 | } |
| 239 | |
| 240 | /* Set the serial data line to the desired state */ |
| 241 | static void ivtv_setsda(struct ivtv *itv, int state) |
| 242 | { |
| 243 | /* write them out */ |
| 244 | /* write bits are inverted */ |
| 245 | write_reg(~state & 1, IVTV_REG_I2C_SETSDA_OFFSET); |
| 246 | } |
| 247 | |
| 248 | /* Read the serial clock line */ |
| 249 | static int ivtv_getscl(struct ivtv *itv) |
| 250 | { |
| 251 | return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; |
| 252 | } |
| 253 | |
| 254 | /* Read the serial data line */ |
| 255 | static int ivtv_getsda(struct ivtv *itv) |
| 256 | { |
| 257 | return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; |
| 258 | } |
| 259 | |
| 260 | /* Implement a short delay by polling the serial clock line */ |
| 261 | static void ivtv_scldelay(struct ivtv *itv) |
| 262 | { |
| 263 | int i; |
| 264 | |
| 265 | for (i = 0; i < 5; ++i) |
| 266 | ivtv_getscl(itv); |
| 267 | } |
| 268 | |
| 269 | /* Wait for the serial clock line to become set to a specific value */ |
| 270 | static int ivtv_waitscl(struct ivtv *itv, int val) |
| 271 | { |
| 272 | int i; |
| 273 | |
| 274 | ivtv_scldelay(itv); |
| 275 | for (i = 0; i < 1000; ++i) { |
| 276 | if (ivtv_getscl(itv) == val) |
| 277 | return 1; |
| 278 | } |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | /* Wait for the serial data line to become set to a specific value */ |
| 283 | static int ivtv_waitsda(struct ivtv *itv, int val) |
| 284 | { |
| 285 | int i; |
| 286 | |
| 287 | ivtv_scldelay(itv); |
| 288 | for (i = 0; i < 1000; ++i) { |
| 289 | if (ivtv_getsda(itv) == val) |
| 290 | return 1; |
| 291 | } |
| 292 | return 0; |
| 293 | } |
| 294 | |
| 295 | /* Wait for the slave to issue an ACK */ |
| 296 | static int ivtv_ack(struct ivtv *itv) |
| 297 | { |
| 298 | int ret = 0; |
| 299 | |
| 300 | if (ivtv_getscl(itv) == 1) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 301 | IVTV_DEBUG_HI_I2C("SCL was high starting an ack\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 302 | ivtv_setscl(itv, 0); |
| 303 | if (!ivtv_waitscl(itv, 0)) { |
| 304 | IVTV_DEBUG_I2C("Could not set SCL low starting an ack\n"); |
| 305 | return -EREMOTEIO; |
| 306 | } |
| 307 | } |
| 308 | ivtv_setsda(itv, 1); |
| 309 | ivtv_scldelay(itv); |
| 310 | ivtv_setscl(itv, 1); |
| 311 | if (!ivtv_waitsda(itv, 0)) { |
| 312 | IVTV_DEBUG_I2C("Slave did not ack\n"); |
| 313 | ret = -EREMOTEIO; |
| 314 | } |
| 315 | ivtv_setscl(itv, 0); |
| 316 | if (!ivtv_waitscl(itv, 0)) { |
| 317 | IVTV_DEBUG_I2C("Failed to set SCL low after ACK\n"); |
| 318 | ret = -EREMOTEIO; |
| 319 | } |
| 320 | return ret; |
| 321 | } |
| 322 | |
| 323 | /* Write a single byte to the i2c bus and wait for the slave to ACK */ |
| 324 | static int ivtv_sendbyte(struct ivtv *itv, unsigned char byte) |
| 325 | { |
| 326 | int i, bit; |
| 327 | |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 328 | IVTV_DEBUG_HI_I2C("write %x\n",byte); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 329 | for (i = 0; i < 8; ++i, byte<<=1) { |
| 330 | ivtv_setscl(itv, 0); |
| 331 | if (!ivtv_waitscl(itv, 0)) { |
| 332 | IVTV_DEBUG_I2C("Error setting SCL low\n"); |
| 333 | return -EREMOTEIO; |
| 334 | } |
| 335 | bit = (byte>>7)&1; |
| 336 | ivtv_setsda(itv, bit); |
| 337 | if (!ivtv_waitsda(itv, bit)) { |
| 338 | IVTV_DEBUG_I2C("Error setting SDA\n"); |
| 339 | return -EREMOTEIO; |
| 340 | } |
| 341 | ivtv_setscl(itv, 1); |
| 342 | if (!ivtv_waitscl(itv, 1)) { |
| 343 | IVTV_DEBUG_I2C("Slave not ready for bit\n"); |
| 344 | return -EREMOTEIO; |
| 345 | } |
| 346 | } |
| 347 | ivtv_setscl(itv, 0); |
| 348 | if (!ivtv_waitscl(itv, 0)) { |
| 349 | IVTV_DEBUG_I2C("Error setting SCL low\n"); |
| 350 | return -EREMOTEIO; |
| 351 | } |
| 352 | return ivtv_ack(itv); |
| 353 | } |
| 354 | |
| 355 | /* Read a byte from the i2c bus and send a NACK if applicable (i.e. for the |
| 356 | final byte) */ |
| 357 | static int ivtv_readbyte(struct ivtv *itv, unsigned char *byte, int nack) |
| 358 | { |
| 359 | int i; |
| 360 | |
| 361 | *byte = 0; |
| 362 | |
| 363 | ivtv_setsda(itv, 1); |
| 364 | ivtv_scldelay(itv); |
| 365 | for (i = 0; i < 8; ++i) { |
| 366 | ivtv_setscl(itv, 0); |
| 367 | ivtv_scldelay(itv); |
| 368 | ivtv_setscl(itv, 1); |
| 369 | if (!ivtv_waitscl(itv, 1)) { |
| 370 | IVTV_DEBUG_I2C("Error setting SCL high\n"); |
| 371 | return -EREMOTEIO; |
| 372 | } |
| 373 | *byte = ((*byte)<<1)|ivtv_getsda(itv); |
| 374 | } |
| 375 | ivtv_setscl(itv, 0); |
| 376 | ivtv_scldelay(itv); |
| 377 | ivtv_setsda(itv, nack); |
| 378 | ivtv_scldelay(itv); |
| 379 | ivtv_setscl(itv, 1); |
| 380 | ivtv_scldelay(itv); |
| 381 | ivtv_setscl(itv, 0); |
| 382 | ivtv_scldelay(itv); |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 383 | IVTV_DEBUG_HI_I2C("read %x\n",*byte); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | /* Issue a start condition on the i2c bus to alert slaves to prepare for |
| 388 | an address write */ |
| 389 | static int ivtv_start(struct ivtv *itv) |
| 390 | { |
| 391 | int sda; |
| 392 | |
| 393 | sda = ivtv_getsda(itv); |
| 394 | if (sda != 1) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 395 | IVTV_DEBUG_HI_I2C("SDA was low at start\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 396 | ivtv_setsda(itv, 1); |
| 397 | if (!ivtv_waitsda(itv, 1)) { |
| 398 | IVTV_DEBUG_I2C("SDA stuck low\n"); |
| 399 | return -EREMOTEIO; |
| 400 | } |
| 401 | } |
| 402 | if (ivtv_getscl(itv) != 1) { |
| 403 | ivtv_setscl(itv, 1); |
| 404 | if (!ivtv_waitscl(itv, 1)) { |
| 405 | IVTV_DEBUG_I2C("SCL stuck low at start\n"); |
| 406 | return -EREMOTEIO; |
| 407 | } |
| 408 | } |
| 409 | ivtv_setsda(itv, 0); |
| 410 | ivtv_scldelay(itv); |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | /* Issue a stop condition on the i2c bus to release it */ |
| 415 | static int ivtv_stop(struct ivtv *itv) |
| 416 | { |
| 417 | int i; |
| 418 | |
| 419 | if (ivtv_getscl(itv) != 0) { |
Hans Verkuil | 11d2876 | 2007-07-17 12:47:38 -0300 | [diff] [blame] | 420 | IVTV_DEBUG_HI_I2C("SCL not low when stopping\n"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 421 | ivtv_setscl(itv, 0); |
| 422 | if (!ivtv_waitscl(itv, 0)) { |
| 423 | IVTV_DEBUG_I2C("SCL could not be set low\n"); |
| 424 | } |
| 425 | } |
| 426 | ivtv_setsda(itv, 0); |
| 427 | ivtv_scldelay(itv); |
| 428 | ivtv_setscl(itv, 1); |
| 429 | if (!ivtv_waitscl(itv, 1)) { |
| 430 | IVTV_DEBUG_I2C("SCL could not be set high\n"); |
| 431 | return -EREMOTEIO; |
| 432 | } |
| 433 | ivtv_scldelay(itv); |
| 434 | ivtv_setsda(itv, 1); |
| 435 | if (!ivtv_waitsda(itv, 1)) { |
| 436 | IVTV_DEBUG_I2C("resetting I2C\n"); |
| 437 | for (i = 0; i < 16; ++i) { |
| 438 | ivtv_setscl(itv, 0); |
| 439 | ivtv_scldelay(itv); |
| 440 | ivtv_setscl(itv, 1); |
| 441 | ivtv_scldelay(itv); |
| 442 | ivtv_setsda(itv, 1); |
| 443 | } |
| 444 | ivtv_waitsda(itv, 1); |
| 445 | return -EREMOTEIO; |
| 446 | } |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | /* Write a message to the given i2c slave. do_stop may be 0 to prevent |
| 451 | issuing the i2c stop condition (when following with a read) */ |
| 452 | static int ivtv_write(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len, int do_stop) |
| 453 | { |
| 454 | int retry, ret = -EREMOTEIO; |
| 455 | u32 i; |
| 456 | |
| 457 | for (retry = 0; ret != 0 && retry < 8; ++retry) { |
| 458 | ret = ivtv_start(itv); |
| 459 | |
| 460 | if (ret == 0) { |
| 461 | ret = ivtv_sendbyte(itv, addr<<1); |
| 462 | for (i = 0; ret == 0 && i < len; ++i) |
| 463 | ret = ivtv_sendbyte(itv, data[i]); |
| 464 | } |
| 465 | if (ret != 0 || do_stop) { |
| 466 | ivtv_stop(itv); |
| 467 | } |
| 468 | } |
| 469 | if (ret) |
| 470 | IVTV_DEBUG_I2C("i2c write to %x failed\n", addr); |
| 471 | return ret; |
| 472 | } |
| 473 | |
| 474 | /* Read data from the given i2c slave. A stop condition is always issued. */ |
| 475 | static int ivtv_read(struct ivtv *itv, unsigned char addr, unsigned char *data, u32 len) |
| 476 | { |
| 477 | int retry, ret = -EREMOTEIO; |
| 478 | u32 i; |
| 479 | |
| 480 | for (retry = 0; ret != 0 && retry < 8; ++retry) { |
| 481 | ret = ivtv_start(itv); |
| 482 | if (ret == 0) |
| 483 | ret = ivtv_sendbyte(itv, (addr << 1) | 1); |
| 484 | for (i = 0; ret == 0 && i < len; ++i) { |
| 485 | ret = ivtv_readbyte(itv, &data[i], i == len - 1); |
| 486 | } |
| 487 | ivtv_stop(itv); |
| 488 | } |
| 489 | if (ret) |
| 490 | IVTV_DEBUG_I2C("i2c read from %x failed\n", addr); |
| 491 | return ret; |
| 492 | } |
| 493 | |
| 494 | /* Kernel i2c transfer implementation. Takes a number of messages to be read |
| 495 | or written. If a read follows a write, this will occur without an |
| 496 | intervening stop condition */ |
| 497 | static int ivtv_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) |
| 498 | { |
| 499 | struct ivtv *itv = i2c_get_adapdata(i2c_adap); |
| 500 | int retval; |
| 501 | int i; |
| 502 | |
| 503 | mutex_lock(&itv->i2c_bus_lock); |
| 504 | for (i = retval = 0; retval == 0 && i < num; i++) { |
| 505 | if (msgs[i].flags & I2C_M_RD) |
| 506 | retval = ivtv_read(itv, msgs[i].addr, msgs[i].buf, msgs[i].len); |
| 507 | else { |
| 508 | /* if followed by a read, don't stop */ |
| 509 | int stop = !(i + 1 < num && msgs[i + 1].flags == I2C_M_RD); |
| 510 | |
| 511 | retval = ivtv_write(itv, msgs[i].addr, msgs[i].buf, msgs[i].len, stop); |
| 512 | } |
| 513 | } |
| 514 | mutex_unlock(&itv->i2c_bus_lock); |
| 515 | return retval ? retval : num; |
| 516 | } |
| 517 | |
| 518 | /* Kernel i2c capabilities */ |
| 519 | static u32 ivtv_functionality(struct i2c_adapter *adap) |
| 520 | { |
| 521 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 522 | } |
| 523 | |
| 524 | static struct i2c_algorithm ivtv_algo = { |
| 525 | .master_xfer = ivtv_xfer, |
| 526 | .functionality = ivtv_functionality, |
| 527 | }; |
| 528 | |
| 529 | /* template for our-bit banger */ |
| 530 | static struct i2c_adapter ivtv_i2c_adap_hw_template = { |
| 531 | .name = "ivtv i2c driver", |
| 532 | .id = I2C_HW_B_CX2341X, |
| 533 | .algo = &ivtv_algo, |
| 534 | .algo_data = NULL, /* filled from template */ |
| 535 | .client_register = attach_inform, |
| 536 | .client_unregister = detach_inform, |
| 537 | .owner = THIS_MODULE, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 538 | }; |
| 539 | |
| 540 | static void ivtv_setscl_old(void *data, int state) |
| 541 | { |
| 542 | struct ivtv *itv = (struct ivtv *)data; |
| 543 | |
| 544 | if (state) |
| 545 | itv->i2c_state |= 0x01; |
| 546 | else |
| 547 | itv->i2c_state &= ~0x01; |
| 548 | |
| 549 | /* write them out */ |
| 550 | /* write bits are inverted */ |
| 551 | write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSCL_OFFSET); |
| 552 | } |
| 553 | |
| 554 | static void ivtv_setsda_old(void *data, int state) |
| 555 | { |
| 556 | struct ivtv *itv = (struct ivtv *)data; |
| 557 | |
| 558 | if (state) |
| 559 | itv->i2c_state |= 0x01; |
| 560 | else |
| 561 | itv->i2c_state &= ~0x01; |
| 562 | |
| 563 | /* write them out */ |
| 564 | /* write bits are inverted */ |
| 565 | write_reg(~itv->i2c_state, IVTV_REG_I2C_SETSDA_OFFSET); |
| 566 | } |
| 567 | |
| 568 | static int ivtv_getscl_old(void *data) |
| 569 | { |
| 570 | struct ivtv *itv = (struct ivtv *)data; |
| 571 | |
| 572 | return read_reg(IVTV_REG_I2C_GETSCL_OFFSET) & 1; |
| 573 | } |
| 574 | |
| 575 | static int ivtv_getsda_old(void *data) |
| 576 | { |
| 577 | struct ivtv *itv = (struct ivtv *)data; |
| 578 | |
| 579 | return read_reg(IVTV_REG_I2C_GETSDA_OFFSET) & 1; |
| 580 | } |
| 581 | |
| 582 | /* template for i2c-bit-algo */ |
| 583 | static struct i2c_adapter ivtv_i2c_adap_template = { |
| 584 | .name = "ivtv i2c driver", |
Jean Delvare | d998cc6 | 2007-12-22 18:28:22 -0300 | [diff] [blame] | 585 | .id = I2C_HW_B_CX2341X, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 586 | .algo = NULL, /* set by i2c-algo-bit */ |
| 587 | .algo_data = NULL, /* filled from template */ |
| 588 | .client_register = attach_inform, |
| 589 | .client_unregister = detach_inform, |
| 590 | .owner = THIS_MODULE, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 591 | }; |
| 592 | |
Jean Delvare | aeb292d | 2007-08-23 15:45:41 -0300 | [diff] [blame] | 593 | static const struct i2c_algo_bit_data ivtv_i2c_algo_template = { |
| 594 | .setsda = ivtv_setsda_old, |
| 595 | .setscl = ivtv_setscl_old, |
| 596 | .getsda = ivtv_getsda_old, |
| 597 | .getscl = ivtv_getscl_old, |
Hans Verkuil | 89dab35 | 2008-01-07 06:46:26 -0200 | [diff] [blame] | 598 | .udelay = 10, |
Jean Delvare | aeb292d | 2007-08-23 15:45:41 -0300 | [diff] [blame] | 599 | .timeout = 200, |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 600 | }; |
| 601 | |
| 602 | static struct i2c_client ivtv_i2c_client_template = { |
Andrew Morton | a415783 | 2007-03-07 11:28:33 -0300 | [diff] [blame] | 603 | .name = "ivtv internal", |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 604 | }; |
| 605 | |
| 606 | int ivtv_call_i2c_client(struct ivtv *itv, int addr, unsigned int cmd, void *arg) |
| 607 | { |
| 608 | struct i2c_client *client; |
| 609 | int retval; |
| 610 | int i; |
| 611 | |
| 612 | IVTV_DEBUG_I2C("call_i2c_client addr=%02x\n", addr); |
| 613 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 614 | client = itv->i2c_clients[i]; |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 615 | if (client == NULL || client->driver == NULL || |
| 616 | client->driver->command == NULL) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 617 | continue; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 618 | if (addr == client->addr) { |
| 619 | retval = client->driver->command(client, cmd, arg); |
| 620 | return retval; |
| 621 | } |
| 622 | } |
Hans Verkuil | 51dec1f | 2007-04-27 12:31:27 -0300 | [diff] [blame] | 623 | if (cmd != VIDIOC_G_CHIP_IDENT) |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 624 | 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] | 625 | return -ENODEV; |
| 626 | } |
| 627 | |
| 628 | /* Find the i2c device based on the driver ID and return |
| 629 | its i2c address or -ENODEV if no matching device was found. */ |
Hans Verkuil | 31ec135 | 2007-03-03 08:50:42 -0300 | [diff] [blame] | 630 | static int ivtv_i2c_id_addr(struct ivtv *itv, u32 id) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 631 | { |
| 632 | struct i2c_client *client; |
| 633 | int retval = -ENODEV; |
| 634 | int i; |
| 635 | |
| 636 | for (i = 0; i < I2C_CLIENTS_MAX; i++) { |
| 637 | client = itv->i2c_clients[i]; |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 638 | if (client == NULL || client->driver == NULL) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 639 | continue; |
| 640 | if (id == client->driver->id) { |
| 641 | retval = client->addr; |
| 642 | break; |
| 643 | } |
| 644 | } |
| 645 | return retval; |
| 646 | } |
| 647 | |
| 648 | /* Find the i2c device name matching the DRIVERID */ |
| 649 | static const char *ivtv_i2c_id_name(u32 id) |
| 650 | { |
| 651 | int i; |
| 652 | |
| 653 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 654 | if (hw_driverids[i] == id) |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 655 | return hw_devicenames[i]; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 656 | return "unknown device"; |
| 657 | } |
| 658 | |
| 659 | /* Find the i2c device name matching the IVTV_HW_ flag */ |
| 660 | static const char *ivtv_i2c_hw_name(u32 hw) |
| 661 | { |
| 662 | int i; |
| 663 | |
| 664 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 665 | if (1 << i == hw) |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 666 | return hw_devicenames[i]; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 667 | return "unknown device"; |
| 668 | } |
| 669 | |
| 670 | /* Find the i2c device matching the IVTV_HW_ flag and return |
| 671 | its i2c address or -ENODEV if no matching device was found. */ |
| 672 | int ivtv_i2c_hw_addr(struct ivtv *itv, u32 hw) |
| 673 | { |
| 674 | int i; |
| 675 | |
| 676 | for (i = 0; i < ARRAY_SIZE(hw_driverids); i++) |
| 677 | if (1 << i == hw) |
| 678 | return ivtv_i2c_id_addr(itv, hw_driverids[i]); |
| 679 | return -ENODEV; |
| 680 | } |
| 681 | |
| 682 | /* Calls i2c device based on IVTV_HW_ flag. If hw == 0, then do nothing. |
| 683 | If hw == IVTV_HW_GPIO then call the gpio handler. */ |
| 684 | int ivtv_i2c_hw(struct ivtv *itv, u32 hw, unsigned int cmd, void *arg) |
| 685 | { |
| 686 | int addr; |
| 687 | |
| 688 | if (hw == IVTV_HW_GPIO) |
| 689 | return ivtv_gpio(itv, cmd, arg); |
| 690 | if (hw == 0) |
| 691 | return 0; |
| 692 | |
| 693 | addr = ivtv_i2c_hw_addr(itv, hw); |
| 694 | if (addr < 0) { |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 695 | 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] | 696 | hw, ivtv_i2c_hw_name(hw), cmd); |
| 697 | return addr; |
| 698 | } |
| 699 | return ivtv_call_i2c_client(itv, addr, cmd, arg); |
| 700 | } |
| 701 | |
| 702 | /* Calls i2c device based on I2C driver ID. */ |
| 703 | int ivtv_i2c_id(struct ivtv *itv, u32 id, unsigned int cmd, void *arg) |
| 704 | { |
| 705 | int addr; |
| 706 | |
| 707 | addr = ivtv_i2c_id_addr(itv, id); |
| 708 | if (addr < 0) { |
Hans Verkuil | 51dec1f | 2007-04-27 12:31:27 -0300 | [diff] [blame] | 709 | if (cmd != VIDIOC_G_CHIP_IDENT) |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 710 | 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] | 711 | id, ivtv_i2c_id_name(id), cmd); |
| 712 | return addr; |
| 713 | } |
| 714 | return ivtv_call_i2c_client(itv, addr, cmd, arg); |
| 715 | } |
| 716 | |
| 717 | int ivtv_cx25840(struct ivtv *itv, unsigned int cmd, void *arg) |
| 718 | { |
| 719 | return ivtv_call_i2c_client(itv, IVTV_CX25840_I2C_ADDR, cmd, arg); |
| 720 | } |
| 721 | |
| 722 | int ivtv_saa7115(struct ivtv *itv, unsigned int cmd, void *arg) |
| 723 | { |
| 724 | return ivtv_call_i2c_client(itv, IVTV_SAA7115_I2C_ADDR, cmd, arg); |
| 725 | } |
| 726 | |
| 727 | int ivtv_saa7127(struct ivtv *itv, unsigned int cmd, void *arg) |
| 728 | { |
| 729 | return ivtv_call_i2c_client(itv, IVTV_SAA7127_I2C_ADDR, cmd, arg); |
| 730 | } |
| 731 | |
| 732 | int ivtv_saa717x(struct ivtv *itv, unsigned int cmd, void *arg) |
| 733 | { |
| 734 | return ivtv_call_i2c_client(itv, IVTV_SAA717x_I2C_ADDR, cmd, arg); |
| 735 | } |
| 736 | |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 737 | int ivtv_upd64031a(struct ivtv *itv, unsigned int cmd, void *arg) |
| 738 | { |
| 739 | return ivtv_call_i2c_client(itv, IVTV_UPD64031A_I2C_ADDR, cmd, arg); |
| 740 | } |
| 741 | |
| 742 | int ivtv_upd64083(struct ivtv *itv, unsigned int cmd, void *arg) |
| 743 | { |
| 744 | return ivtv_call_i2c_client(itv, IVTV_UPD64083_I2C_ADDR, cmd, arg); |
| 745 | } |
| 746 | |
| 747 | /* broadcast cmd for all I2C clients and for the gpio subsystem */ |
| 748 | void ivtv_call_i2c_clients(struct ivtv *itv, unsigned int cmd, void *arg) |
| 749 | { |
| 750 | if (itv->i2c_adap.algo == NULL) { |
Hans Verkuil | ae38d93 | 2007-07-17 13:42:43 -0300 | [diff] [blame] | 751 | IVTV_ERR("Adapter is not set"); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 752 | return; |
| 753 | } |
| 754 | i2c_clients_command(&itv->i2c_adap, cmd, arg); |
| 755 | if (itv->hw_flags & IVTV_HW_GPIO) |
| 756 | ivtv_gpio(itv, cmd, arg); |
| 757 | } |
| 758 | |
| 759 | /* init + register i2c algo-bit adapter */ |
Adrian Bunk | 056827a | 2007-12-11 19:23:49 -0300 | [diff] [blame] | 760 | int init_ivtv_i2c(struct ivtv *itv) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 761 | { |
| 762 | IVTV_DEBUG_I2C("i2c init\n"); |
| 763 | |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 764 | /* Sanity checks for the I2C hardware arrays. They must be the |
| 765 | * same size and GPIO must be the last entry. |
| 766 | */ |
| 767 | if (ARRAY_SIZE(hw_driverids) != ARRAY_SIZE(hw_addrs) || |
Jean Delvare | af29486 | 2008-05-18 20:49:40 +0200 | [diff] [blame] | 768 | ARRAY_SIZE(hw_devicenames) != ARRAY_SIZE(hw_addrs) || |
Hans Verkuil | d900920 | 2007-12-07 21:01:15 -0300 | [diff] [blame] | 769 | IVTV_HW_GPIO != (1 << (ARRAY_SIZE(hw_addrs) - 1)) || |
| 770 | hw_driverids[ARRAY_SIZE(hw_addrs) - 1]) { |
| 771 | IVTV_ERR("Mismatched I2C hardware arrays\n"); |
| 772 | return -ENODEV; |
| 773 | } |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 774 | if (itv->options.newi2c > 0) { |
| 775 | memcpy(&itv->i2c_adap, &ivtv_i2c_adap_hw_template, |
| 776 | sizeof(struct i2c_adapter)); |
| 777 | } else { |
| 778 | memcpy(&itv->i2c_adap, &ivtv_i2c_adap_template, |
| 779 | sizeof(struct i2c_adapter)); |
| 780 | memcpy(&itv->i2c_algo, &ivtv_i2c_algo_template, |
| 781 | sizeof(struct i2c_algo_bit_data)); |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 782 | } |
Hans Verkuil | 0e614cd | 2007-12-21 21:33:36 -0300 | [diff] [blame] | 783 | itv->i2c_algo.data = itv; |
| 784 | itv->i2c_adap.algo_data = &itv->i2c_algo; |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 785 | |
| 786 | sprintf(itv->i2c_adap.name + strlen(itv->i2c_adap.name), " #%d", |
| 787 | itv->num); |
| 788 | i2c_set_adapdata(&itv->i2c_adap, itv); |
| 789 | |
| 790 | memcpy(&itv->i2c_client, &ivtv_i2c_client_template, |
| 791 | sizeof(struct i2c_client)); |
| 792 | itv->i2c_client.adapter = &itv->i2c_adap; |
| 793 | itv->i2c_adap.dev.parent = &itv->dev->dev; |
| 794 | |
| 795 | IVTV_DEBUG_I2C("setting scl and sda to 1\n"); |
| 796 | ivtv_setscl(itv, 1); |
| 797 | ivtv_setsda(itv, 1); |
| 798 | |
| 799 | if (itv->options.newi2c > 0) |
| 800 | return i2c_add_adapter(&itv->i2c_adap); |
| 801 | else |
| 802 | return i2c_bit_add_bus(&itv->i2c_adap); |
| 803 | } |
| 804 | |
David Miller | bb374b7 | 2007-10-30 21:23:48 -0700 | [diff] [blame] | 805 | void exit_ivtv_i2c(struct ivtv *itv) |
Hans Verkuil | 1a0adaf | 2007-04-27 12:31:25 -0300 | [diff] [blame] | 806 | { |
| 807 | IVTV_DEBUG_I2C("i2c exit\n"); |
| 808 | |
| 809 | i2c_del_adapter(&itv->i2c_adap); |
| 810 | } |