1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the Conexant CX23885 PCIe bridge 4 * 5 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org> 6 */ 7 8 #include "cx23885.h" 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/delay.h> 13 #include <asm/io.h> 14 15 #include <media/v4l2-common.h> 16 17 static unsigned int i2c_debug; 18 module_param(i2c_debug, int, 0644); 19 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]"); 20 21 static unsigned int i2c_scan; 22 module_param(i2c_scan, int, 0444); 23 MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time"); 24 25 #define dprintk(level, fmt, arg...)\ 26 do { if (i2c_debug >= level)\ 27 printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \ 28 __func__, ##arg); \ 29 } while (0) 30 31 #define I2C_WAIT_DELAY 32 32 #define I2C_WAIT_RETRY 64 33 34 #define I2C_EXTEND (1 << 3) 35 #define I2C_NOSTOP (1 << 4) 36 37 static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap) 38 { 39 struct cx23885_i2c *bus = i2c_adap->algo_data; 40 struct cx23885_dev *dev = bus->dev; 41 return cx_read(bus->reg_stat) & 0x01; 42 } 43 44 static inline int i2c_is_busy(struct i2c_adapter *i2c_adap) 45 { 46 struct cx23885_i2c *bus = i2c_adap->algo_data; 47 struct cx23885_dev *dev = bus->dev; 48 return cx_read(bus->reg_stat) & 0x02 ? 1 : 0; 49 } 50 51 static int i2c_wait_done(struct i2c_adapter *i2c_adap) 52 { 53 int count; 54 55 for (count = 0; count < I2C_WAIT_RETRY; count++) { 56 if (!i2c_is_busy(i2c_adap)) 57 break; 58 udelay(I2C_WAIT_DELAY); 59 } 60 61 if (I2C_WAIT_RETRY == count) 62 return 0; 63 64 return 1; 65 } 66 67 static int i2c_sendbytes(struct i2c_adapter *i2c_adap, 68 const struct i2c_msg *msg, int joined_rlen) 69 { 70 struct cx23885_i2c *bus = i2c_adap->algo_data; 71 struct cx23885_dev *dev = bus->dev; 72 u32 wdata, addr, ctrl; 73 int retval, cnt; 74 75 if (joined_rlen) 76 dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__, 77 msg->len, joined_rlen); 78 else 79 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 80 81 /* Deal with i2c probe functions with zero payload */ 82 if (msg->len == 0) { 83 cx_write(bus->reg_addr, msg->addr << 25); 84 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2)); 85 if (!i2c_wait_done(i2c_adap)) 86 return -EIO; 87 if (!i2c_slave_did_ack(i2c_adap)) 88 return -ENXIO; 89 90 dprintk(1, "%s() returns 0\n", __func__); 91 return 0; 92 } 93 94 95 /* dev, reg + first byte */ 96 addr = (msg->addr << 25) | msg->buf[0]; 97 wdata = msg->buf[0]; 98 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 99 100 if (msg->len > 1) 101 ctrl |= I2C_NOSTOP | I2C_EXTEND; 102 else if (joined_rlen) 103 ctrl |= I2C_NOSTOP; 104 105 cx_write(bus->reg_addr, addr); 106 cx_write(bus->reg_wdata, wdata); 107 cx_write(bus->reg_ctrl, ctrl); 108 109 if (!i2c_wait_done(i2c_adap)) 110 goto eio; 111 if (i2c_debug) { 112 printk(KERN_DEBUG " <W %02x %02x", msg->addr << 1, msg->buf[0]); 113 if (!(ctrl & I2C_NOSTOP)) 114 pr_cont(" >\n"); 115 } 116 117 for (cnt = 1; cnt < msg->len; cnt++) { 118 /* following bytes */ 119 wdata = msg->buf[cnt]; 120 ctrl = bus->i2c_period | (1 << 12) | (1 << 2); 121 122 if (cnt < msg->len - 1) 123 ctrl |= I2C_NOSTOP | I2C_EXTEND; 124 else if (joined_rlen) 125 ctrl |= I2C_NOSTOP; 126 127 cx_write(bus->reg_addr, addr); 128 cx_write(bus->reg_wdata, wdata); 129 cx_write(bus->reg_ctrl, ctrl); 130 131 if (!i2c_wait_done(i2c_adap)) 132 goto eio; 133 if (i2c_debug) { 134 pr_cont(" %02x", msg->buf[cnt]); 135 if (!(ctrl & I2C_NOSTOP)) 136 pr_cont(" >\n"); 137 } 138 } 139 return msg->len; 140 141 eio: 142 retval = -EIO; 143 if (i2c_debug) 144 pr_err(" ERR: %d\n", retval); 145 return retval; 146 } 147 148 static int i2c_readbytes(struct i2c_adapter *i2c_adap, 149 const struct i2c_msg *msg, int joined) 150 { 151 struct cx23885_i2c *bus = i2c_adap->algo_data; 152 struct cx23885_dev *dev = bus->dev; 153 u32 ctrl, cnt; 154 int retval; 155 156 157 if (i2c_debug && !joined) 158 dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len); 159 160 /* Deal with i2c probe functions with zero payload */ 161 if (msg->len == 0) { 162 cx_write(bus->reg_addr, msg->addr << 25); 163 cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1); 164 if (!i2c_wait_done(i2c_adap)) 165 return -EIO; 166 if (!i2c_slave_did_ack(i2c_adap)) 167 return -ENXIO; 168 169 170 dprintk(1, "%s() returns 0\n", __func__); 171 return 0; 172 } 173 174 if (i2c_debug) { 175 if (joined) 176 dprintk(1, " R"); 177 else 178 dprintk(1, " <R %02x", (msg->addr << 1) + 1); 179 } 180 181 for (cnt = 0; cnt < msg->len; cnt++) { 182 183 ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1; 184 185 if (cnt < msg->len - 1) 186 ctrl |= I2C_NOSTOP | I2C_EXTEND; 187 188 cx_write(bus->reg_addr, msg->addr << 25); 189 cx_write(bus->reg_ctrl, ctrl); 190 191 if (!i2c_wait_done(i2c_adap)) 192 goto eio; 193 msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff; 194 if (i2c_debug) { 195 dprintk(1, " %02x", msg->buf[cnt]); 196 if (!(ctrl & I2C_NOSTOP)) 197 dprintk(1, " >\n"); 198 } 199 } 200 return msg->len; 201 202 eio: 203 retval = -EIO; 204 if (i2c_debug) 205 pr_err(" ERR: %d\n", retval); 206 return retval; 207 } 208 209 static int i2c_xfer(struct i2c_adapter *i2c_adap, 210 struct i2c_msg *msgs, int num) 211 { 212 int i, retval = 0; 213 214 dprintk(1, "%s(num = %d)\n", __func__, num); 215 216 for (i = 0 ; i < num; i++) { 217 dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n", 218 __func__, num, msgs[i].addr, msgs[i].len); 219 if (msgs[i].flags & I2C_M_RD) { 220 /* read */ 221 retval = i2c_readbytes(i2c_adap, &msgs[i], 0); 222 } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && 223 msgs[i].addr == msgs[i + 1].addr) { 224 /* write then read from same address */ 225 retval = i2c_sendbytes(i2c_adap, &msgs[i], 226 msgs[i + 1].len); 227 if (retval < 0) 228 goto err; 229 i++; 230 retval = i2c_readbytes(i2c_adap, &msgs[i], 1); 231 } else { 232 /* write */ 233 retval = i2c_sendbytes(i2c_adap, &msgs[i], 0); 234 } 235 if (retval < 0) 236 goto err; 237 } 238 return num; 239 240 err: 241 return retval; 242 } 243 244 static u32 cx23885_functionality(struct i2c_adapter *adap) 245 { 246 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; 247 } 248 249 static const struct i2c_algorithm cx23885_i2c_algo_template = { 250 .master_xfer = i2c_xfer, 251 .functionality = cx23885_functionality, 252 }; 253 254 /* ----------------------------------------------------------------------- */ 255 256 static const struct i2c_adapter cx23885_i2c_adap_template = { 257 .name = "cx23885", 258 .owner = THIS_MODULE, 259 .algo = &cx23885_i2c_algo_template, 260 }; 261 262 static const struct i2c_client cx23885_i2c_client_template = { 263 .name = "cx23885 internal", 264 }; 265 266 static char *i2c_devs[128] = { 267 [0x10 >> 1] = "tda10048", 268 [0x12 >> 1] = "dib7000pc", 269 [0x1c >> 1] = "lgdt3303", 270 [0x80 >> 1] = "cs3308", 271 [0x82 >> 1] = "cs3308", 272 [0x86 >> 1] = "tda9887", 273 [0x32 >> 1] = "cx24227", 274 [0x88 >> 1] = "cx25837", 275 [0x84 >> 1] = "tda8295", 276 [0x98 >> 1] = "flatiron", 277 [0xa0 >> 1] = "eeprom", 278 [0xc0 >> 1] = "tuner/mt2131/tda8275", 279 [0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028", 280 [0xc8 >> 1] = "tuner/xc3028L", 281 }; 282 283 static void do_i2c_scan(char *name, struct i2c_client *c) 284 { 285 unsigned char buf; 286 int i, rc; 287 288 for (i = 0; i < 128; i++) { 289 c->addr = i; 290 rc = i2c_master_recv(c, &buf, 0); 291 if (rc < 0) 292 continue; 293 pr_info("%s: i2c scan: found device @ 0x%04x [%s]\n", 294 name, i, i2c_devs[i] ? i2c_devs[i] : "???"); 295 } 296 } 297 298 /* init + register i2c adapter */ 299 int cx23885_i2c_register(struct cx23885_i2c *bus) 300 { 301 struct cx23885_dev *dev = bus->dev; 302 303 dprintk(1, "%s(bus = %d)\n", __func__, bus->nr); 304 305 bus->i2c_adap = cx23885_i2c_adap_template; 306 bus->i2c_client = cx23885_i2c_client_template; 307 bus->i2c_adap.dev.parent = &dev->pci->dev; 308 309 strscpy(bus->i2c_adap.name, bus->dev->name, 310 sizeof(bus->i2c_adap.name)); 311 312 bus->i2c_adap.algo_data = bus; 313 i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev); 314 i2c_add_adapter(&bus->i2c_adap); 315 316 bus->i2c_client.adapter = &bus->i2c_adap; 317 318 if (0 == bus->i2c_rc) { 319 dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr); 320 if (i2c_scan) { 321 pr_info("%s: scan bus %d:\n", 322 dev->name, bus->nr); 323 do_i2c_scan(dev->name, &bus->i2c_client); 324 } 325 } else 326 pr_warn("%s: i2c bus %d register FAILED\n", 327 dev->name, bus->nr); 328 329 /* Instantiate the IR receiver device, if present */ 330 if (0 == bus->i2c_rc) { 331 struct i2c_board_info info; 332 static const unsigned short addr_list[] = { 333 0x6b, I2C_CLIENT_END 334 }; 335 336 memset(&info, 0, sizeof(struct i2c_board_info)); 337 strscpy(info.type, "ir_video", I2C_NAME_SIZE); 338 /* Use quick read command for probe, some IR chips don't 339 * support writes */ 340 i2c_new_probed_device(&bus->i2c_adap, &info, addr_list, 341 i2c_probe_func_quick_read); 342 } 343 344 return bus->i2c_rc; 345 } 346 347 int cx23885_i2c_unregister(struct cx23885_i2c *bus) 348 { 349 i2c_del_adapter(&bus->i2c_adap); 350 return 0; 351 } 352 353 void cx23885_av_clk(struct cx23885_dev *dev, int enable) 354 { 355 /* write 0 to bus 2 addr 0x144 via i2x_xfer() */ 356 char buffer[3]; 357 struct i2c_msg msg; 358 dprintk(1, "%s(enabled = %d)\n", __func__, enable); 359 360 /* Register 0x144 */ 361 buffer[0] = 0x01; 362 buffer[1] = 0x44; 363 if (enable == 1) 364 buffer[2] = 0x05; 365 else 366 buffer[2] = 0x00; 367 368 msg.addr = 0x44; 369 msg.flags = I2C_M_TEN; 370 msg.len = 3; 371 msg.buf = buffer; 372 373 i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1); 374 } 375