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 <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/init.h> 21 #include <linux/delay.h> 22 #include <asm/io.h> 23 24 #include "cx23885.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 "%s/0: " fmt, dev->name, ## arg);\ 39 } while (0) 40 41 #define I2C_WAIT_DELAY 32 42 #define I2C_WAIT_RETRY 64 43 44 #define I2C_EXTEND (1 << 3) 45 #define I2C_NOSTOP (1 << 4) 46 47 static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap) 48 { 49 struct cx23885_i2c *bus = i2c_adap->algo_data; 50 struct cx23885_dev *dev = bus->dev; 51 return cx_read(bus->reg_stat) & 0x01; 52 } 53 54 static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) 55 { 56 struct cx23885_i2c *bus = i2c_adap->algo_data; 57 struct cx23885_dev *dev = bus->dev; 58 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0; 59 } 60 61 static int i2c_wait_done(struct i2c_adapter *i2c_adap) 62 { 63 int count; 64 65 for (count = 0; count < I2C_WAIT_RETRY; count++) { 66 if (!i2c_is_busy(i2c_adap)) 67 break; 68 udelay(I2C_WAIT_DELAY); 69 } 70 71 if (I2C_WAIT_RETRY == count) 72 return 0; 73 74 return 1; 75 } 76 77 static int i2c_sendbytes(struct i2c_adapter *i2c_adap, 78 const struct i2c_msg *msg, int joined_rlen) 79 { 80 struct cx23885_i2c *bus = i2c_adap->algo_data; 81 struct cx23885_dev *dev = bus->dev; 82 u32 wdata, addr, ctrl; 83 int retval, cnt; 84 85 if (joined_rlen) 86 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__, 87 msg->len, joined_rlen); 88 else 89 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 90 91 /* Deal with i2c probe functions with zero payload */ 92 if (msg->len == 0) { 93 cx_write(bus->reg_addr, msg->addr << 25); 94 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2)); 95 if (!i2c_wait_done(i2c_adap)) 96 return -EIO; 97 if (!i2c_slave_did_ack(i2c_adap)) 98 return -ENXIO; 99 100 dprintk(1, "%s() returns 0\n", __func__); 101 return 0; 102 } 103 104 105 /* dev, reg + first byte */ 106 addr = (msg->addr << 25) | msg->buf[0]; 107 wdata = msg->buf[0]; 108 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 109 110 if (msg->len > 1) 111 ctrl |= I2C_NOSTOP | I2C_EXTEND; 112 else if (joined_rlen) 113 ctrl |= I2C_NOSTOP; 114 115 cx_write(bus->reg_addr, addr); 116 cx_write(bus->reg_wdata, wdata); 117 cx_write(bus->reg_ctrl, ctrl); 118 119 if (!i2c_wait_done(i2c_adap)) 120 goto eio; 121 if (i2c_debug) { 122 printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]); 123 if (!(ctrl & I2C_NOSTOP)) 124 printk(" >\n"); 125 } 126 127 for (cnt = 1; cnt < msg->len; cnt++) { 128 /* following bytes */ 129 wdata = msg->buf[cnt]; 130 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 131 132 if (cnt < msg->len - 1) 133 ctrl |= I2C_NOSTOP | I2C_EXTEND; 134 else if (joined_rlen) 135 ctrl |= I2C_NOSTOP; 136 137 cx_write(bus->reg_addr, addr); 138 cx_write(bus->reg_wdata, wdata); 139 cx_write(bus->reg_ctrl, ctrl); 140 141 if (!i2c_wait_done(i2c_adap)) 142 goto eio; 143 if (i2c_debug) { 144 dprintk(1, " %02x", msg->buf[cnt]); 145 if (!(ctrl & I2C_NOSTOP)) 146 dprintk(1, " >\n"); 147 } 148 } 149 return msg->len; 150 151 eio: 152 retval = -EIO; 153 if (i2c_debug) 154 printk(KERN_ERR " ERR: %d\n", retval); 155 return retval; 156 } 157 158 static int i2c_readbytes(struct i2c_adapter *i2c_adap, 159 const struct i2c_msg *msg, int joined) 160 { 161 struct cx23885_i2c *bus = i2c_adap->algo_data; 162 struct cx23885_dev *dev = bus->dev; 163 u32 ctrl, cnt; 164 int retval; 165 166 167 if (i2c_debug && !joined) 168 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 169 170 /* Deal with i2c probe functions with zero payload */ 171 if (msg->len == 0) { 172 cx_write(bus->reg_addr, msg->addr << 25); 173 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1); 174 if (!i2c_wait_done(i2c_adap)) 175 return -EIO; 176 if (!i2c_slave_did_ack(i2c_adap)) 177 return -ENXIO; 178 179 180 dprintk(1, "%s() returns 0\n", __func__); 181 return 0; 182 } 183 184 if (i2c_debug) { 185 if (joined) 186 dprintk(1, " R"); 187 else 188 dprintk(1, " <R %02x", (msg->addr << 1) + 1); 189 } 190 191 for (cnt = 0; cnt < msg->len; cnt++) { 192 193 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1; 194 195 if (cnt < msg->len - 1) 196 ctrl |= I2C_NOSTOP | I2C_EXTEND; 197 198 cx_write(bus->reg_addr, msg->addr << 25); 199 cx_write(bus->reg_ctrl, ctrl); 200 201 if (!i2c_wait_done(i2c_adap)) 202 goto eio; 203 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff; 204 if (i2c_debug) { 205 dprintk(1, " %02x", msg->buf[cnt]); 206 if (!(ctrl & I2C_NOSTOP)) 207 dprintk(1, " >\n"); 208 } 209 } 210 return msg->len; 211 212 eio: 213 retval = -EIO; 214 if (i2c_debug) 215 printk(KERN_ERR " ERR: %d\n", retval); 216 return retval; 217 } 218 219 static int i2c_xfer(struct i2c_adapter *i2c_adap, 220 struct i2c_msg *msgs, int num) 221 { 222 struct cx23885_i2c *bus = i2c_adap->algo_data; 223 struct cx23885_dev *dev = bus->dev; 224 int i, retval = 0; 225 226 dprintk(1, "%s(num = %d)\n", __func__, num); 227 228 for (i = 0 ; i < num; i++) { 229 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n", 230 __func__, num, msgs[i].addr, msgs[i].len); 231 if (msgs[i].flags & I2C_M_RD) { 232 /* read */ 233 retval = i2c_readbytes(i2c_adap, &msgs[i], 0); 234 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && 235 msgs[i].addr == msgs[i + 1].addr) { 236 /* write then read from same address */ 237 retval = i2c_sendbytes(i2c_adap, &msgs[i], 238 msgs[i + 1].len); 239 if (retval < 0) 240 goto err; 241 i++; 242 retval = i2c_readbytes(i2c_adap, &msgs[i], 1); 243 } else { 244 /* write */ 245 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); 246 } 247 if (retval < 0) 248 goto err; 249 } 250 return num; 251 252 err: 253 return retval; 254 } 255 256 static u32 cx23885_functionality(struct i2c_adapter *adap) 257 { 258 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; 259 } 260 261 static struct i2c_algorithm cx23885_i2c_algo_template = { 262 .master_xfer = i2c_xfer, 263 .functionality = cx23885_functionality, 264 }; 265 266 /* ----------------------------------------------------------------------- */ 267 268 static struct i2c_adapter cx23885_i2c_adap_template = { 269 .name = "cx23885", 270 .owner = THIS_MODULE, 271 .algo = &cx23885_i2c_algo_template, 272 }; 273 274 static struct i2c_client cx23885_i2c_client_template = { 275 .name = "cx23885 internal", 276 }; 277 278 static char *i2c_devs[128] = { 279 [0x10 >> 1] = "tda10048", 280 [0x12 >> 1] = "dib7000pc", 281 [0x1c >> 1] = "lgdt3303", 282 [0x80 >> 1] = "cs3308", 283 [0x82 >> 1] = "cs3308", 284 [0x86 >> 1] = "tda9887", 285 [0x32 >> 1] = "cx24227", 286 [0x88 >> 1] = "cx25837", 287 [0x84 >> 1] = "tda8295", 288 [0x98 >> 1] = "flatiron", 289 [0xa0 >> 1] = "eeprom", 290 [0xc0 >> 1] = "tuner/mt2131/tda8275", 291 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028", 292 [0xc8 >> 1] = "tuner/xc3028L", 293 }; 294 295 static void do_i2c_scan(char *name, struct i2c_client *c) 296 { 297 unsigned char buf; 298 int i, rc; 299 300 for (i = 0; i < 128; i++) { 301 c->addr = i; 302 rc = i2c_master_recv(c, &buf, 0); 303 if (rc < 0) 304 continue; 305 printk(KERN_INFO "%s: i2c scan: found device @ 0x%04x [%s]\n", 306 name, i, i2c_devs[i] ? i2c_devs[i] : "???"); 307 } 308 } 309 310 /* init + register i2c adapter */ 311 int cx23885_i2c_register(struct cx23885_i2c *bus) 312 { 313 struct cx23885_dev *dev = bus->dev; 314 315 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); 316 317 bus->i2c_adap = cx23885_i2c_adap_template; 318 bus->i2c_client = cx23885_i2c_client_template; 319 bus->i2c_adap.dev.parent = &dev->pci->dev; 320 321 strlcpy(bus->i2c_adap.name, bus->dev->name, 322 sizeof(bus->i2c_adap.name)); 323 324 bus->i2c_adap.algo_data = bus; 325 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); 326 i2c_add_adapter(&bus->i2c_adap); 327 328 bus->i2c_client.adapter = &bus->i2c_adap; 329 330 if (0 == bus->i2c_rc) { 331 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr); 332 if (i2c_scan) { 333 printk(KERN_INFO "%s: scan bus %d:\n", 334 dev->name, bus->nr); 335 do_i2c_scan(dev->name, &bus->i2c_client); 336 } 337 } else 338 printk(KERN_WARNING "%s: i2c bus %d register FAILED\n", 339 dev->name, bus->nr); 340 341 /* Instantiate the IR receiver device, if present */ 342 if (0 == bus->i2c_rc) { 343 struct i2c_board_info info; 344 const unsigned short addr_list[] = { 345 0x6b, I2C_CLIENT_END 346 }; 347 348 memset(&info, 0, sizeof(struct i2c_board_info)); 349 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 350 /* Use quick read command for probe, some IR chips don't 351 * support writes */ 352 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list, 353 i2c_probe_func_quick_read); 354 } 355 356 return bus->i2c_rc; 357 } 358 359 int cx23885_i2c_unregister(struct cx23885_i2c *bus) 360 { 361 i2c_del_adapter(&bus->i2c_adap); 362 return 0; 363 } 364 365 void cx23885_av_clk(struct cx23885_dev *dev, int enable) 366 { 367 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */ 368 char buffer[3]; 369 struct i2c_msg msg; 370 dprintk(1, "%s(enabled = %d)\n", __func__, enable); 371 372 /* Register 0x144 */ 373 buffer[0] = 0x01; 374 buffer[1] = 0x44; 375 if (enable == 1) 376 buffer[2] = 0x05; 377 else 378 buffer[2] = 0x00; 379 380 msg.addr = 0x44; 381 msg.flags = I2C_M_TEN; 382 msg.len = 3; 383 msg.buf = buffer; 384 385 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1); 386 } 387