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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for the Auvitek AU0828 USB bridge * * Copyright (c) 2008 Steven Toth <stoth@linuxtv.org> */ #include "au0828.h" #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/io.h> #include "media/tuner.h" #include <media/v4l2-common.h> static int i2c_scan; module_param(i2c_scan, int, 0444); MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); #define I2C_WAIT_DELAY 25 #define I2C_WAIT_RETRY 1000 static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap) { struct au0828_dev *dev = i2c_adap->algo_data; return au0828_read(dev, AU0828_I2C_STATUS_201) & AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1; } static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap) { int count; for (count = 0; count < I2C_WAIT_RETRY; count++) { if (!i2c_slave_did_read_ack(i2c_adap)) break; udelay(I2C_WAIT_DELAY); } if (I2C_WAIT_RETRY == count) return 0; return 1; } static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap) { struct au0828_dev *dev = i2c_adap->algo_data; return au0828_read(dev, AU0828_I2C_STATUS_201) & AU0828_I2C_STATUS_READ_DONE ? 0 : 1; } static int i2c_wait_read_done(struct i2c_adapter *i2c_adap) { int count; for (count = 0; count < I2C_WAIT_RETRY; count++) { if (!i2c_is_read_busy(i2c_adap)) break; udelay(I2C_WAIT_DELAY); } if (I2C_WAIT_RETRY == count) return 0; return 1; } static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap) { struct au0828_dev *dev = i2c_adap->algo_data; return au0828_read(dev, AU0828_I2C_STATUS_201) & AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0; } static int i2c_wait_write_done(struct i2c_adapter *i2c_adap) { int count; for (count = 0; count < I2C_WAIT_RETRY; count++) { if (i2c_is_write_done(i2c_adap)) break; udelay(I2C_WAIT_DELAY); } if (I2C_WAIT_RETRY == count) return 0; return 1; } static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) { struct au0828_dev *dev = i2c_adap->algo_data; return au0828_read(dev, AU0828_I2C_STATUS_201) & AU0828_I2C_STATUS_BUSY ? 1 : 0; } static int i2c_wait_done(struct i2c_adapter *i2c_adap) { int count; for (count = 0; count < I2C_WAIT_RETRY; count++) { if (!i2c_is_busy(i2c_adap)) break; udelay(I2C_WAIT_DELAY); } if (I2C_WAIT_RETRY == count) return 0; return 1; } /* FIXME: Implement join handling correctly */ static int i2c_sendbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int joined_rlen) { int i, strobe = 0; struct au0828_dev *dev = i2c_adap->algo_data; u8 i2c_speed = dev->board.i2c_clk_divider; dprintk(4, "%s()\n", __func__); au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); if (((dev->board.tuner_type == TUNER_XC5000) || (dev->board.tuner_type == TUNER_XC5000C)) && (dev->board.tuner_addr == msg->addr)) { /* * Due to I2C clock stretch, we need to use a lower speed * on xc5000 for commands. However, firmware transfer can * speed up to 400 KHz. */ if (msg->len == 64) i2c_speed = AU0828_I2C_CLK_250KHZ; else i2c_speed = AU0828_I2C_CLK_20KHZ; } /* Set the I2C clock */ au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed); /* Hardware needs 8 bit addresses */ au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); dprintk(4, "SEND: %02x\n", msg->addr); /* Deal with i2c_scan */ if (msg->len == 0) { /* The analog tuner detection code makes use of the SMBUS_QUICK message (which involves a zero length i2c write). To avoid checking the status register when we didn't strobe out any actual bytes to the bus, just do a read check. This is consistent with how I saw i2c device checking done in the USB trace of the Windows driver */ au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_READ); if (!i2c_wait_done(i2c_adap)) return -EIO; if (i2c_wait_read_ack(i2c_adap)) return -EIO; return 0; } for (i = 0; i < msg->len;) { dprintk(4, " %02x\n", msg->buf[i]); au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]); strobe++; i++; if ((strobe >= 4) || (i >= msg->len)) { /* Strobe the byte into the bus */ if (i < msg->len) au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_WRITE | AU0828_I2C_TRIGGER_HOLD); else au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_WRITE); /* Reset strobe trigger */ strobe = 0; if (!i2c_wait_write_done(i2c_adap)) return -EIO; } } if (!i2c_wait_done(i2c_adap)) return -EIO; dprintk(4, "\n"); return msg->len; } /* FIXME: Implement join handling correctly */ static int i2c_readbytes(struct i2c_adapter *i2c_adap, const struct i2c_msg *msg, int joined) { struct au0828_dev *dev = i2c_adap->algo_data; u8 i2c_speed = dev->board.i2c_clk_divider; int i; dprintk(4, "%s()\n", __func__); au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01); /* * Due to xc5000c clock stretch, we cannot use full speed at * readings from xc5000, as otherwise they'll fail. */ if (((dev->board.tuner_type == TUNER_XC5000) || (dev->board.tuner_type == TUNER_XC5000C)) && (dev->board.tuner_addr == msg->addr)) i2c_speed = AU0828_I2C_CLK_20KHZ; /* Set the I2C clock */ au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed); /* Hardware needs 8 bit addresses */ au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1); dprintk(4, " RECV:\n"); /* Deal with i2c_scan */ if (msg->len == 0) { au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_READ); if (i2c_wait_read_ack(i2c_adap)) return -EIO; return 0; } for (i = 0; i < msg->len;) { i++; if (i < msg->len) au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_READ | AU0828_I2C_TRIGGER_HOLD); else au0828_write(dev, AU0828_I2C_TRIGGER_200, AU0828_I2C_TRIGGER_READ); if (!i2c_wait_read_done(i2c_adap)) return -EIO; msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) & 0xff; dprintk(4, " %02x\n", msg->buf[i-1]); } if (!i2c_wait_done(i2c_adap)) return -EIO; dprintk(4, "\n"); return msg->len; } static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) { int i, retval = 0; dprintk(4, "%s(num = %d)\n", __func__, num); for (i = 0; i < num; i++) { dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n", __func__, num, msgs[i].addr, msgs[i].len); if (msgs[i].flags & I2C_M_RD) { /* read */ retval = i2c_readbytes(i2c_adap, &msgs[i], 0); } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && msgs[i].addr == msgs[i + 1].addr) { /* write then read from same address */ retval = i2c_sendbytes(i2c_adap, &msgs[i], msgs[i + 1].len); if (retval < 0) goto err; i++; retval = i2c_readbytes(i2c_adap, &msgs[i], 1); } else { /* write */ retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); } if (retval < 0) goto err; } return num; err: return retval; } static u32 au0828_functionality(struct i2c_adapter *adap) { return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; } static const struct i2c_algorithm au0828_i2c_algo_template = { .master_xfer = i2c_xfer, .functionality = au0828_functionality, }; /* ----------------------------------------------------------------------- */ static const struct i2c_adapter au0828_i2c_adap_template = { .name = KBUILD_MODNAME, .owner = THIS_MODULE, .algo = &au0828_i2c_algo_template, }; static const struct i2c_client au0828_i2c_client_template = { .name = "au0828 internal", }; static char *i2c_devs[128] = { [0x8e >> 1] = "au8522", [0xa0 >> 1] = "eeprom", [0xc2 >> 1] = "tuner/xc5000", }; static void do_i2c_scan(char *name, struct i2c_client *c) { unsigned char buf; int i, rc; for (i = 0; i < 128; i++) { c->addr = i; rc = i2c_master_recv(c, &buf, 0); if (rc < 0) continue; pr_info("%s: i2c scan: found device @ 0x%x [%s]\n", name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); } } /* init + register i2c adapter */ int au0828_i2c_register(struct au0828_dev *dev) { dprintk(1, "%s()\n", __func__); dev->i2c_adap = au0828_i2c_adap_template; dev->i2c_algo = au0828_i2c_algo_template; dev->i2c_client = au0828_i2c_client_template; dev->i2c_adap.dev.parent = &dev->usbdev->dev; strscpy(dev->i2c_adap.name, KBUILD_MODNAME, sizeof(dev->i2c_adap.name)); dev->i2c_adap.algo = &dev->i2c_algo; dev->i2c_adap.algo_data = dev; #ifdef CONFIG_VIDEO_AU0828_V4L2 i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); #else i2c_set_adapdata(&dev->i2c_adap, dev); #endif i2c_add_adapter(&dev->i2c_adap); dev->i2c_client.adapter = &dev->i2c_adap; if (0 == dev->i2c_rc) { pr_info("i2c bus registered\n"); if (i2c_scan) do_i2c_scan(KBUILD_MODNAME, &dev->i2c_client); } else pr_info("i2c bus register FAILED\n"); return dev->i2c_rc; } int au0828_i2c_unregister(struct au0828_dev *dev) { i2c_del_adapter(&dev->i2c_adap); return 0; } |