1 /* 2 * Driver for the Conexant CX23885 PCIe bridge 3 * 4 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org> 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 * 15 * GNU General Public License for more details. 16 */ 17 18 #include "cx23885.h" 19 20 #include <linux/module.h> 21 #include <linux/moduleparam.h> 22 #include <linux/init.h> 23 #include <linux/delay.h> 24 #include <asm/io.h> 25 26 #include <media/v4l2-common.h> 27 28 static unsigned int i2c_debug; 29 module_param(i2c_debug, int, 0644); 30 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 31 32 static unsigned int i2c_scan; 33 module_param(i2c_scan, int, 0444); 34 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 35 36 #define dprintk(level, fmt, arg...)\ 37 do { if (i2c_debug >= level)\ 38 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ 39 __func__, ##arg); \ 40 } while (0) 41 42 #define I2C_WAIT_DELAY 32 43 #define I2C_WAIT_RETRY 64 44 45 #define I2C_EXTEND (1 << 3) 46 #define I2C_NOSTOP (1 << 4) 47 48 static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap) 49 { 50 struct cx23885_i2c *bus = i2c_adap->algo_data; 51 struct cx23885_dev *dev = bus->dev; 52 return cx_read(bus->reg_stat) & 0x01; 53 } 54 55 static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) 56 { 57 struct cx23885_i2c *bus = i2c_adap->algo_data; 58 struct cx23885_dev *dev = bus->dev; 59 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0; 60 } 61 62 static int i2c_wait_done(struct i2c_adapter *i2c_adap) 63 { 64 int count; 65 66 for (count = 0; count < I2C_WAIT_RETRY; count++) { 67 if (!i2c_is_busy(i2c_adap)) 68 break; 69 udelay(I2C_WAIT_DELAY); 70 } 71 72 if (I2C_WAIT_RETRY == count) 73 return 0; 74 75 return 1; 76 } 77 78 static int i2c_sendbytes(struct i2c_adapter *i2c_adap, 79 const struct i2c_msg *msg, int joined_rlen) 80 { 81 struct cx23885_i2c *bus = i2c_adap->algo_data; 82 struct cx23885_dev *dev = bus->dev; 83 u32 wdata, addr, ctrl; 84 int retval, cnt; 85 86 if (joined_rlen) 87 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__, 88 msg->len, joined_rlen); 89 else 90 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 91 92 /* Deal with i2c probe functions with zero payload */ 93 if (msg->len == 0) { 94 cx_write(bus->reg_addr, msg->addr << 25); 95 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2)); 96 if (!i2c_wait_done(i2c_adap)) 97 return -EIO; 98 if (!i2c_slave_did_ack(i2c_adap)) 99 return -ENXIO; 100 101 dprintk(1, "%s() returns 0\n", __func__); 102 return 0; 103 } 104 105 106 /* dev, reg + first byte */ 107 addr = (msg->addr << 25) | msg->buf[0]; 108 wdata = msg->buf[0]; 109 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 110 111 if (msg->len > 1) 112 ctrl |= I2C_NOSTOP | I2C_EXTEND; 113 else if (joined_rlen) 114 ctrl |= I2C_NOSTOP; 115 116 cx_write(bus->reg_addr, addr); 117 cx_write(bus->reg_wdata, wdata); 118 cx_write(bus->reg_ctrl, ctrl); 119 120 if (!i2c_wait_done(i2c_adap)) 121 goto eio; 122 if (i2c_debug) { 123 printk(KERN_DEBUG " <W %02x %02x", msg->addr << 1, msg->buf[0]); 124 if (!(ctrl & I2C_NOSTOP)) 125 pr_cont(" >\n"); 126 } 127 128 for (cnt = 1; cnt < msg->len; cnt++) { 129 /* following bytes */ 130 wdata = msg->buf[cnt]; 131 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 132 133 if (cnt < msg->len - 1) 134 ctrl |= I2C_NOSTOP | I2C_EXTEND; 135 else if (joined_rlen) 136 ctrl |= I2C_NOSTOP; 137 138 cx_write(bus->reg_addr, addr); 139 cx_write(bus->reg_wdata, wdata); 140 cx_write(bus->reg_ctrl, ctrl); 141 142 if (!i2c_wait_done(i2c_adap)) 143 goto eio; 144 if (i2c_debug) { 145 pr_cont(" %02x", msg->buf[cnt]); 146 if (!(ctrl & I2C_NOSTOP)) 147 pr_cont(" >\n"); 148 } 149 } 150 return msg->len; 151 152 eio: 153 retval = -EIO; 154 if (i2c_debug) 155 pr_err(" ERR: %d\n", retval); 156 return retval; 157 } 158 159 static int i2c_readbytes(struct i2c_adapter *i2c_adap, 160 const struct i2c_msg *msg, int joined) 161 { 162 struct cx23885_i2c *bus = i2c_adap->algo_data; 163 struct cx23885_dev *dev = bus->dev; 164 u32 ctrl, cnt; 165 int retval; 166 167 168 if (i2c_debug && !joined) 169 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 170 171 /* Deal with i2c probe functions with zero payload */ 172 if (msg->len == 0) { 173 cx_write(bus->reg_addr, msg->addr << 25); 174 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1); 175 if (!i2c_wait_done(i2c_adap)) 176 return -EIO; 177 if (!i2c_slave_did_ack(i2c_adap)) 178 return -ENXIO; 179 180 181 dprintk(1, "%s() returns 0\n", __func__); 182 return 0; 183 } 184 185 if (i2c_debug) { 186 if (joined) 187 dprintk(1, " R"); 188 else 189 dprintk(1, " <R %02x", (msg->addr << 1) + 1); 190 } 191 192 for (cnt = 0; cnt < msg->len; cnt++) { 193 194 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1; 195 196 if (cnt < msg->len - 1) 197 ctrl |= I2C_NOSTOP | I2C_EXTEND; 198 199 cx_write(bus->reg_addr, msg->addr << 25); 200 cx_write(bus->reg_ctrl, ctrl); 201 202 if (!i2c_wait_done(i2c_adap)) 203 goto eio; 204 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff; 205 if (i2c_debug) { 206 dprintk(1, " %02x", msg->buf[cnt]); 207 if (!(ctrl & I2C_NOSTOP)) 208 dprintk(1, " >\n"); 209 } 210 } 211 return msg->len; 212 213 eio: 214 retval = -EIO; 215 if (i2c_debug) 216 pr_err(" ERR: %d\n", retval); 217 return retval; 218 } 219 220 static int i2c_xfer(struct i2c_adapter *i2c_adap, 221 struct i2c_msg *msgs, int num) 222 { 223 int i, retval = 0; 224 225 dprintk(1, "%s(num = %d)\n", __func__, num); 226 227 for (i = 0 ; i < num; i++) { 228 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n", 229 __func__, num, msgs[i].addr, msgs[i].len); 230 if (msgs[i].flags & I2C_M_RD) { 231 /* read */ 232 retval = i2c_readbytes(i2c_adap, &msgs[i], 0); 233 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && 234 msgs[i].addr == msgs[i + 1].addr) { 235 /* write then read from same address */ 236 retval = i2c_sendbytes(i2c_adap, &msgs[i], 237 msgs[i + 1].len); 238 if (retval < 0) 239 goto err; 240 i++; 241 retval = i2c_readbytes(i2c_adap, &msgs[i], 1); 242 } else { 243 /* write */ 244 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); 245 } 246 if (retval < 0) 247 goto err; 248 } 249 return num; 250 251 err: 252 return retval; 253 } 254 255 static u32 cx23885_functionality(struct i2c_adapter *adap) 256 { 257 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; 258 } 259 260 static const struct i2c_algorithm cx23885_i2c_algo_template = { 261 .master_xfer = i2c_xfer, 262 .functionality = cx23885_functionality, 263 }; 264 265 /* ----------------------------------------------------------------------- */ 266 267 static const struct i2c_adapter cx23885_i2c_adap_template = { 268 .name = "cx23885", 269 .owner = THIS_MODULE, 270 .algo = &cx23885_i2c_algo_template, 271 }; 272 273 static const struct i2c_client cx23885_i2c_client_template = { 274 .name = "cx23885 internal", 275 }; 276 277 static char *i2c_devs[128] = { 278 [0x10 >> 1] = "tda10048", 279 [0x12 >> 1] = "dib7000pc", 280 [0x1c >> 1] = "lgdt3303", 281 [0x80 >> 1] = "cs3308", 282 [0x82 >> 1] = "cs3308", 283 [0x86 >> 1] = "tda9887", 284 [0x32 >> 1] = "cx24227", 285 [0x88 >> 1] = "cx25837", 286 [0x84 >> 1] = "tda8295", 287 [0x98 >> 1] = "flatiron", 288 [0xa0 >> 1] = "eeprom", 289 [0xc0 >> 1] = "tuner/mt2131/tda8275", 290 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028", 291 [0xc8 >> 1] = "tuner/xc3028L", 292 }; 293 294 static void do_i2c_scan(char *name, struct i2c_client *c) 295 { 296 unsigned char buf; 297 int i, rc; 298 299 for (i = 0; i < 128; i++) { 300 c->addr = i; 301 rc = i2c_master_recv(c, &buf, 0); 302 if (rc < 0) 303 continue; 304 pr_info("%s: i2c scan: found device @ 0x%04x [%s]\n", 305 name, i, i2c_devs[i] ? i2c_devs[i] : "???"); 306 } 307 } 308 309 /* init + register i2c adapter */ 310 int cx23885_i2c_register(struct cx23885_i2c *bus) 311 { 312 struct cx23885_dev *dev = bus->dev; 313 314 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); 315 316 bus->i2c_adap = cx23885_i2c_adap_template; 317 bus->i2c_client = cx23885_i2c_client_template; 318 bus->i2c_adap.dev.parent = &dev->pci->dev; 319 320 strlcpy(bus->i2c_adap.name, bus->dev->name, 321 sizeof(bus->i2c_adap.name)); 322 323 bus->i2c_adap.algo_data = bus; 324 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); 325 i2c_add_adapter(&bus->i2c_adap); 326 327 bus->i2c_client.adapter = &bus->i2c_adap; 328 329 if (0 == bus->i2c_rc) { 330 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr); 331 if (i2c_scan) { 332 pr_info("%s: scan bus %d:\n", 333 dev->name, bus->nr); 334 do_i2c_scan(dev->name, &bus->i2c_client); 335 } 336 } else 337 pr_warn("%s: i2c bus %d register FAILED\n", 338 dev->name, bus->nr); 339 340 /* Instantiate the IR receiver device, if present */ 341 if (0 == bus->i2c_rc) { 342 struct i2c_board_info info; 343 const unsigned short addr_list[] = { 344 0x6b, I2C_CLIENT_END 345 }; 346 347 memset(&info, 0, sizeof(struct i2c_board_info)); 348 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 349 /* Use quick read command for probe, some IR chips don't 350 * support writes */ 351 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list, 352 i2c_probe_func_quick_read); 353 } 354 355 return bus->i2c_rc; 356 } 357 358 int cx23885_i2c_unregister(struct cx23885_i2c *bus) 359 { 360 i2c_del_adapter(&bus->i2c_adap); 361 return 0; 362 } 363 364 void cx23885_av_clk(struct cx23885_dev *dev, int enable) 365 { 366 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */ 367 char buffer[3]; 368 struct i2c_msg msg; 369 dprintk(1, "%s(enabled = %d)\n", __func__, enable); 370 371 /* Register 0x144 */ 372 buffer[0] = 0x01; 373 buffer[1] = 0x44; 374 if (enable == 1) 375 buffer[2] = 0x05; 376 else 377 buffer[2] = 0x00; 378 379 msg.addr = 0x44; 380 msg.flags = I2C_M_TEN; 381 msg.len = 3; 382 msg.buf = buffer; 383 384 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1); 385 } 386