Alessandro Zummo | 4d4e5ce | 2005-10-17 23:04:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * x1205.c - An i2c driver for the Xicor X1205 RTC |
| 3 | * Copyright 2004 Karen Spearel |
| 4 | * Copyright 2005 Alessandro Zummo |
| 5 | * |
| 6 | * please send all reports to: |
| 7 | * kas11 at tampabay dot rr dot com |
| 8 | * a dot zummo at towertech dot it |
| 9 | * |
| 10 | * based on the other drivers in this same directory. |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/i2c.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/bcd.h> |
| 24 | #include <linux/rtc.h> |
| 25 | #include <linux/list.h> |
| 26 | |
| 27 | #include <linux/x1205.h> |
| 28 | |
| 29 | #define DRV_VERSION "0.9.9" |
| 30 | |
| 31 | /* Addresses to scan: none. This chip is located at |
| 32 | * 0x6f and uses a two bytes register addressing. |
| 33 | * Two bytes need to be written to read a single register, |
| 34 | * while most other chips just require one and take the second |
| 35 | * one as the data to be written. To prevent corrupting |
| 36 | * unknown chips, the user must explicitely set the probe parameter. |
| 37 | */ |
| 38 | |
| 39 | static unsigned short normal_i2c[] = { I2C_CLIENT_END }; |
| 40 | |
| 41 | /* Insmod parameters */ |
| 42 | I2C_CLIENT_INSMOD; |
| 43 | I2C_CLIENT_MODULE_PARM(hctosys, |
| 44 | "Set the system time from the hardware clock upon initialization"); |
| 45 | |
| 46 | /* offsets into CCR area */ |
| 47 | |
| 48 | #define CCR_SEC 0 |
| 49 | #define CCR_MIN 1 |
| 50 | #define CCR_HOUR 2 |
| 51 | #define CCR_MDAY 3 |
| 52 | #define CCR_MONTH 4 |
| 53 | #define CCR_YEAR 5 |
| 54 | #define CCR_WDAY 6 |
| 55 | #define CCR_Y2K 7 |
| 56 | |
| 57 | #define X1205_REG_SR 0x3F /* status register */ |
| 58 | #define X1205_REG_Y2K 0x37 |
| 59 | #define X1205_REG_DW 0x36 |
| 60 | #define X1205_REG_YR 0x35 |
| 61 | #define X1205_REG_MO 0x34 |
| 62 | #define X1205_REG_DT 0x33 |
| 63 | #define X1205_REG_HR 0x32 |
| 64 | #define X1205_REG_MN 0x31 |
| 65 | #define X1205_REG_SC 0x30 |
| 66 | #define X1205_REG_DTR 0x13 |
| 67 | #define X1205_REG_ATR 0x12 |
| 68 | #define X1205_REG_INT 0x11 |
| 69 | #define X1205_REG_0 0x10 |
| 70 | #define X1205_REG_Y2K1 0x0F |
| 71 | #define X1205_REG_DWA1 0x0E |
| 72 | #define X1205_REG_YRA1 0x0D |
| 73 | #define X1205_REG_MOA1 0x0C |
| 74 | #define X1205_REG_DTA1 0x0B |
| 75 | #define X1205_REG_HRA1 0x0A |
| 76 | #define X1205_REG_MNA1 0x09 |
| 77 | #define X1205_REG_SCA1 0x08 |
| 78 | #define X1205_REG_Y2K0 0x07 |
| 79 | #define X1205_REG_DWA0 0x06 |
| 80 | #define X1205_REG_YRA0 0x05 |
| 81 | #define X1205_REG_MOA0 0x04 |
| 82 | #define X1205_REG_DTA0 0x03 |
| 83 | #define X1205_REG_HRA0 0x02 |
| 84 | #define X1205_REG_MNA0 0x01 |
| 85 | #define X1205_REG_SCA0 0x00 |
| 86 | |
| 87 | #define X1205_CCR_BASE 0x30 /* Base address of CCR */ |
| 88 | #define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */ |
| 89 | |
| 90 | #define X1205_SR_RTCF 0x01 /* Clock failure */ |
| 91 | #define X1205_SR_WEL 0x02 /* Write Enable Latch */ |
| 92 | #define X1205_SR_RWEL 0x04 /* Register Write Enable */ |
| 93 | |
| 94 | #define X1205_DTR_DTR0 0x01 |
| 95 | #define X1205_DTR_DTR1 0x02 |
| 96 | #define X1205_DTR_DTR2 0x04 |
| 97 | |
| 98 | #define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */ |
| 99 | |
| 100 | /* Prototypes */ |
| 101 | static int x1205_attach(struct i2c_adapter *adapter); |
| 102 | static int x1205_detach(struct i2c_client *client); |
| 103 | static int x1205_probe(struct i2c_adapter *adapter, int address, int kind); |
| 104 | static int x1205_command(struct i2c_client *client, unsigned int cmd, |
| 105 | void *arg); |
| 106 | |
| 107 | static struct i2c_driver x1205_driver = { |
Laurent Riffard | a9718b0 | 2005-11-26 20:36:00 +0100 | [diff] [blame] | 108 | .driver = { |
Laurent Riffard | a9718b0 | 2005-11-26 20:36:00 +0100 | [diff] [blame] | 109 | .name = "x1205", |
| 110 | }, |
Alessandro Zummo | 4d4e5ce | 2005-10-17 23:04:42 +0200 | [diff] [blame] | 111 | .attach_adapter = &x1205_attach, |
| 112 | .detach_client = &x1205_detach, |
| 113 | }; |
| 114 | |
| 115 | struct x1205_data { |
| 116 | struct i2c_client client; |
| 117 | struct list_head list; |
| 118 | unsigned int epoch; |
| 119 | }; |
| 120 | |
| 121 | static const unsigned char days_in_mo[] = |
| 122 | { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; |
| 123 | |
| 124 | static LIST_HEAD(x1205_clients); |
| 125 | |
| 126 | /* Workaround until the I2C subsytem will allow to send |
| 127 | * commands to a specific client. This function will send the command |
| 128 | * to the first client. |
| 129 | */ |
| 130 | int x1205_do_command(unsigned int cmd, void *arg) |
| 131 | { |
| 132 | struct list_head *walk; |
| 133 | struct list_head *tmp; |
| 134 | struct x1205_data *data; |
| 135 | |
| 136 | list_for_each_safe(walk, tmp, &x1205_clients) { |
| 137 | data = list_entry(walk, struct x1205_data, list); |
| 138 | return x1205_command(&data->client, cmd, arg); |
| 139 | } |
| 140 | |
| 141 | return -ENODEV; |
| 142 | } |
| 143 | |
| 144 | #define is_leap(year) \ |
| 145 | ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) |
| 146 | |
| 147 | /* make sure the rtc_time values are in bounds */ |
| 148 | static int x1205_validate_tm(struct rtc_time *tm) |
| 149 | { |
| 150 | int year = tm->tm_year + 1900; |
| 151 | |
| 152 | if ((tm->tm_year < 70) || (tm->tm_year > 255)) |
| 153 | return -EINVAL; |
| 154 | |
| 155 | if ((tm->tm_mon > 11) || (tm->tm_mday == 0)) |
| 156 | return -EINVAL; |
| 157 | |
| 158 | if (tm->tm_mday > days_in_mo[tm->tm_mon] |
| 159 | + ((tm->tm_mon == 1) && is_leap(year))) |
| 160 | return -EINVAL; |
| 161 | |
| 162 | if ((tm->tm_hour >= 24) || (tm->tm_min >= 60) || (tm->tm_sec >= 60)) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * In the routines that deal directly with the x1205 hardware, we use |
| 170 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch |
| 171 | * Epoch is initialized as 2000. Time is set to UTC. |
| 172 | */ |
| 173 | static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm, |
| 174 | u8 reg_base) |
| 175 | { |
| 176 | unsigned char dt_addr[2] = { 0, reg_base }; |
| 177 | static unsigned char sr_addr[2] = { 0, X1205_REG_SR }; |
| 178 | |
| 179 | unsigned char buf[8], sr; |
| 180 | |
| 181 | struct i2c_msg msgs[] = { |
| 182 | { client->addr, 0, 2, sr_addr }, /* setup read ptr */ |
| 183 | { client->addr, I2C_M_RD, 1, &sr }, /* read status */ |
| 184 | { client->addr, 0, 2, dt_addr }, /* setup read ptr */ |
| 185 | { client->addr, I2C_M_RD, 8, buf }, /* read date */ |
| 186 | }; |
| 187 | |
| 188 | struct x1205_data *data = i2c_get_clientdata(client); |
| 189 | |
| 190 | /* read status register */ |
| 191 | if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { |
| 192 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); |
| 193 | return -EIO; |
| 194 | } |
| 195 | |
| 196 | /* check for battery failure */ |
| 197 | if (sr & X1205_SR_RTCF) { |
| 198 | dev_warn(&client->dev, |
| 199 | "Clock had a power failure, you must set the date.\n"); |
| 200 | return -EINVAL; |
| 201 | } |
| 202 | |
| 203 | /* read date registers */ |
| 204 | if ((i2c_transfer(client->adapter, &msgs[2], 2)) != 2) { |
| 205 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); |
| 206 | return -EIO; |
| 207 | } |
| 208 | |
| 209 | dev_dbg(&client->dev, |
| 210 | "%s: raw read data - sec=%02x, min=%02x, hr=%02x, " |
| 211 | "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n", |
| 212 | __FUNCTION__, |
| 213 | buf[0], buf[1], buf[2], buf[3], |
| 214 | buf[4], buf[5], buf[6], buf[7]); |
| 215 | |
| 216 | tm->tm_sec = BCD2BIN(buf[CCR_SEC]); |
| 217 | tm->tm_min = BCD2BIN(buf[CCR_MIN]); |
| 218 | tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */ |
| 219 | tm->tm_mday = BCD2BIN(buf[CCR_MDAY]); |
| 220 | tm->tm_mon = BCD2BIN(buf[CCR_MONTH]); |
| 221 | data->epoch = BCD2BIN(buf[CCR_Y2K]) * 100; |
| 222 | tm->tm_year = BCD2BIN(buf[CCR_YEAR]) + data->epoch - 1900; |
| 223 | tm->tm_wday = buf[CCR_WDAY]; |
| 224 | |
| 225 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
| 226 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
| 227 | __FUNCTION__, |
| 228 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
| 229 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm, |
| 235 | int datetoo, u8 reg_base) |
| 236 | { |
| 237 | int i, err, xfer; |
| 238 | |
| 239 | unsigned char buf[8]; |
| 240 | |
| 241 | static const unsigned char wel[3] = { 0, X1205_REG_SR, |
| 242 | X1205_SR_WEL }; |
| 243 | |
| 244 | static const unsigned char rwel[3] = { 0, X1205_REG_SR, |
| 245 | X1205_SR_WEL | X1205_SR_RWEL }; |
| 246 | |
| 247 | static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 }; |
| 248 | |
| 249 | struct x1205_data *data = i2c_get_clientdata(client); |
| 250 | |
| 251 | /* check if all values in the tm struct are correct */ |
| 252 | if ((err = x1205_validate_tm(tm)) < 0) |
| 253 | return err; |
| 254 | |
| 255 | dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " |
| 256 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
| 257 | __FUNCTION__, |
| 258 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
| 259 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); |
| 260 | |
| 261 | buf[CCR_SEC] = BIN2BCD(tm->tm_sec); |
| 262 | buf[CCR_MIN] = BIN2BCD(tm->tm_min); |
| 263 | |
| 264 | /* set hour and 24hr bit */ |
| 265 | buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL; |
| 266 | |
| 267 | /* should we also set the date? */ |
| 268 | if (datetoo) { |
| 269 | buf[CCR_MDAY] = BIN2BCD(tm->tm_mday); |
| 270 | |
| 271 | /* month, 0 - 11 */ |
| 272 | buf[CCR_MONTH] = BIN2BCD(tm->tm_mon); |
| 273 | |
| 274 | /* year, since 1900 */ |
| 275 | buf[CCR_YEAR] = BIN2BCD(tm->tm_year + 1900 - data->epoch); |
| 276 | buf[CCR_WDAY] = tm->tm_wday & 0x07; |
| 277 | buf[CCR_Y2K] = BIN2BCD(data->epoch / 100); |
| 278 | } |
| 279 | |
| 280 | /* this sequence is required to unlock the chip */ |
| 281 | xfer = i2c_master_send(client, wel, 3); |
| 282 | if (xfer != 3) { |
| 283 | dev_err(&client->dev, "%s: wel - %d\n", __FUNCTION__, xfer); |
| 284 | return -EIO; |
| 285 | } |
| 286 | |
| 287 | xfer = i2c_master_send(client, rwel, 3); |
| 288 | if (xfer != 3) { |
| 289 | dev_err(&client->dev, "%s: rwel - %d\n", __FUNCTION__, xfer); |
| 290 | return -EIO; |
| 291 | } |
| 292 | |
| 293 | /* write register's data */ |
| 294 | for (i = 0; i < (datetoo ? 8 : 3); i++) { |
| 295 | unsigned char rdata[3] = { 0, reg_base + i, buf[i] }; |
| 296 | |
| 297 | xfer = i2c_master_send(client, rdata, 3); |
| 298 | if (xfer != 3) { |
| 299 | dev_err(&client->dev, |
| 300 | "%s: xfer=%d addr=%02x, data=%02x\n", |
| 301 | __FUNCTION__, |
| 302 | xfer, rdata[1], rdata[2]); |
| 303 | return -EIO; |
| 304 | } |
| 305 | }; |
| 306 | |
| 307 | /* disable further writes */ |
| 308 | xfer = i2c_master_send(client, diswe, 3); |
| 309 | if (xfer != 3) { |
| 310 | dev_err(&client->dev, "%s: diswe - %d\n", __FUNCTION__, xfer); |
| 311 | return -EIO; |
| 312 | } |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static int x1205_get_dtrim(struct i2c_client *client, int *trim) |
| 318 | { |
| 319 | unsigned char dtr; |
| 320 | static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR }; |
| 321 | |
| 322 | struct i2c_msg msgs[] = { |
| 323 | { client->addr, 0, 2, dtr_addr }, /* setup read ptr */ |
| 324 | { client->addr, I2C_M_RD, 1, &dtr }, /* read dtr */ |
| 325 | }; |
| 326 | |
| 327 | /* read dtr register */ |
| 328 | if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { |
| 329 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); |
| 330 | return -EIO; |
| 331 | } |
| 332 | |
| 333 | dev_dbg(&client->dev, "%s: raw dtr=%x\n", __FUNCTION__, dtr); |
| 334 | |
| 335 | *trim = 0; |
| 336 | |
| 337 | if (dtr & X1205_DTR_DTR0) |
| 338 | *trim += 20; |
| 339 | |
| 340 | if (dtr & X1205_DTR_DTR1) |
| 341 | *trim += 10; |
| 342 | |
| 343 | if (dtr & X1205_DTR_DTR2) |
| 344 | *trim = -*trim; |
| 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static int x1205_get_atrim(struct i2c_client *client, int *trim) |
| 350 | { |
| 351 | s8 atr; |
| 352 | static unsigned char atr_addr[2] = { 0, X1205_REG_ATR }; |
| 353 | |
| 354 | struct i2c_msg msgs[] = { |
| 355 | { client->addr, 0, 2, atr_addr }, /* setup read ptr */ |
| 356 | { client->addr, I2C_M_RD, 1, &atr }, /* read atr */ |
| 357 | }; |
| 358 | |
| 359 | /* read atr register */ |
| 360 | if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) { |
| 361 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); |
| 362 | return -EIO; |
| 363 | } |
| 364 | |
| 365 | dev_dbg(&client->dev, "%s: raw atr=%x\n", __FUNCTION__, atr); |
| 366 | |
| 367 | /* atr is a two's complement value on 6 bits, |
| 368 | * perform sign extension. The formula is |
| 369 | * Catr = (atr * 0.25pF) + 11.00pF. |
| 370 | */ |
| 371 | if (atr & 0x20) |
| 372 | atr |= 0xC0; |
| 373 | |
| 374 | dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __FUNCTION__, atr, atr); |
| 375 | |
| 376 | *trim = (atr * 250) + 11000; |
| 377 | |
| 378 | dev_dbg(&client->dev, "%s: real=%d\n", __FUNCTION__, *trim); |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int x1205_hctosys(struct i2c_client *client) |
| 384 | { |
| 385 | int err; |
| 386 | |
| 387 | struct rtc_time tm; |
| 388 | struct timespec tv; |
| 389 | |
| 390 | err = x1205_command(client, X1205_CMD_GETDATETIME, &tm); |
| 391 | |
| 392 | if (err) { |
| 393 | dev_err(&client->dev, |
| 394 | "Unable to set the system clock\n"); |
| 395 | return err; |
| 396 | } |
| 397 | |
| 398 | /* IMPORTANT: the RTC only stores whole seconds. It is arbitrary |
| 399 | * whether it stores the most close value or the value with partial |
| 400 | * seconds truncated. However, it is important that we use it to store |
| 401 | * the truncated value. This is because otherwise it is necessary, |
| 402 | * in an rtc sync function, to read both xtime.tv_sec and |
| 403 | * xtime.tv_nsec. On some processors (i.e. ARM), an atomic read |
| 404 | * of >32bits is not possible. So storing the most close value would |
| 405 | * slow down the sync API. So here we have the truncated value and |
| 406 | * the best guess is to add 0.5s. |
| 407 | */ |
| 408 | |
| 409 | tv.tv_nsec = NSEC_PER_SEC >> 1; |
| 410 | |
| 411 | /* WARNING: this is not the C library 'mktime' call, it is a built in |
| 412 | * inline function from include/linux/time.h. It expects (requires) |
| 413 | * the month to be in the range 1-12 |
| 414 | */ |
| 415 | |
| 416 | tv.tv_sec = mktime(tm.tm_year + 1900, tm.tm_mon + 1, |
| 417 | tm.tm_mday, tm.tm_hour, |
| 418 | tm.tm_min, tm.tm_sec); |
| 419 | |
| 420 | do_settimeofday(&tv); |
| 421 | |
| 422 | dev_info(&client->dev, |
| 423 | "setting the system clock to %d-%d-%d %d:%d:%d\n", |
| 424 | tm.tm_year + 1900, tm.tm_mon + 1, |
| 425 | tm.tm_mday, tm.tm_hour, tm.tm_min, |
| 426 | tm.tm_sec); |
| 427 | |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | struct x1205_limit |
| 432 | { |
| 433 | unsigned char reg; |
| 434 | unsigned char mask; |
| 435 | unsigned char min; |
| 436 | unsigned char max; |
| 437 | }; |
| 438 | |
| 439 | static int x1205_validate_client(struct i2c_client *client) |
| 440 | { |
| 441 | int i, xfer; |
| 442 | |
| 443 | /* Probe array. We will read the register at the specified |
| 444 | * address and check if the given bits are zero. |
| 445 | */ |
| 446 | static const unsigned char probe_zero_pattern[] = { |
| 447 | /* register, mask */ |
| 448 | X1205_REG_SR, 0x18, |
| 449 | X1205_REG_DTR, 0xF8, |
| 450 | X1205_REG_ATR, 0xC0, |
| 451 | X1205_REG_INT, 0x18, |
| 452 | X1205_REG_0, 0xFF, |
| 453 | }; |
| 454 | |
| 455 | static const struct x1205_limit probe_limits_pattern[] = { |
| 456 | /* register, mask, min, max */ |
| 457 | { X1205_REG_Y2K, 0xFF, 19, 20 }, |
| 458 | { X1205_REG_DW, 0xFF, 0, 6 }, |
| 459 | { X1205_REG_YR, 0xFF, 0, 99 }, |
| 460 | { X1205_REG_MO, 0xFF, 0, 12 }, |
| 461 | { X1205_REG_DT, 0xFF, 0, 31 }, |
| 462 | { X1205_REG_HR, 0x7F, 0, 23 }, |
| 463 | { X1205_REG_MN, 0xFF, 0, 59 }, |
| 464 | { X1205_REG_SC, 0xFF, 0, 59 }, |
| 465 | { X1205_REG_Y2K1, 0xFF, 19, 20 }, |
| 466 | { X1205_REG_Y2K0, 0xFF, 19, 20 }, |
| 467 | }; |
| 468 | |
| 469 | /* check that registers have bits a 0 where expected */ |
| 470 | for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) { |
| 471 | unsigned char buf; |
| 472 | |
| 473 | unsigned char addr[2] = { 0, probe_zero_pattern[i] }; |
| 474 | |
| 475 | struct i2c_msg msgs[2] = { |
| 476 | { client->addr, 0, 2, addr }, |
| 477 | { client->addr, I2C_M_RD, 1, &buf }, |
| 478 | }; |
| 479 | |
| 480 | xfer = i2c_transfer(client->adapter, msgs, 2); |
| 481 | if (xfer != 2) { |
| 482 | dev_err(&client->adapter->dev, |
| 483 | "%s: could not read register %x\n", |
| 484 | __FUNCTION__, addr[1]); |
| 485 | |
| 486 | return -EIO; |
| 487 | } |
| 488 | |
| 489 | if ((buf & probe_zero_pattern[i+1]) != 0) { |
| 490 | dev_err(&client->adapter->dev, |
| 491 | "%s: register=%02x, zero pattern=%d, value=%x\n", |
| 492 | __FUNCTION__, addr[1], i, buf); |
| 493 | |
| 494 | return -ENODEV; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | /* check limits (only registers with bcd values) */ |
| 499 | for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) { |
| 500 | unsigned char reg, value; |
| 501 | |
| 502 | unsigned char addr[2] = { 0, probe_limits_pattern[i].reg }; |
| 503 | |
| 504 | struct i2c_msg msgs[2] = { |
| 505 | { client->addr, 0, 2, addr }, |
| 506 | { client->addr, I2C_M_RD, 1, ® }, |
| 507 | }; |
| 508 | |
| 509 | xfer = i2c_transfer(client->adapter, msgs, 2); |
| 510 | |
| 511 | if (xfer != 2) { |
| 512 | dev_err(&client->adapter->dev, |
| 513 | "%s: could not read register %x\n", |
| 514 | __FUNCTION__, addr[1]); |
| 515 | |
| 516 | return -EIO; |
| 517 | } |
| 518 | |
| 519 | value = BCD2BIN(reg & probe_limits_pattern[i].mask); |
| 520 | |
| 521 | if (value > probe_limits_pattern[i].max || |
| 522 | value < probe_limits_pattern[i].min) { |
| 523 | dev_dbg(&client->adapter->dev, |
| 524 | "%s: register=%x, lim pattern=%d, value=%d\n", |
| 525 | __FUNCTION__, addr[1], i, value); |
| 526 | |
| 527 | return -ENODEV; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static int x1205_attach(struct i2c_adapter *adapter) |
| 535 | { |
| 536 | dev_dbg(&adapter->dev, "%s\n", __FUNCTION__); |
| 537 | |
| 538 | return i2c_probe(adapter, &addr_data, x1205_probe); |
| 539 | } |
| 540 | |
| 541 | int x1205_direct_attach(int adapter_id, |
| 542 | struct i2c_client_address_data *address_data) |
| 543 | { |
| 544 | int err; |
| 545 | struct i2c_adapter *adapter = i2c_get_adapter(adapter_id); |
| 546 | |
| 547 | if (adapter) { |
| 548 | err = i2c_probe(adapter, |
| 549 | address_data, x1205_probe); |
| 550 | |
| 551 | i2c_put_adapter(adapter); |
| 552 | |
| 553 | return err; |
| 554 | } |
| 555 | |
| 556 | return -ENODEV; |
| 557 | } |
| 558 | |
| 559 | static int x1205_probe(struct i2c_adapter *adapter, int address, int kind) |
| 560 | { |
| 561 | struct i2c_client *client; |
| 562 | struct x1205_data *data; |
| 563 | |
| 564 | int err = 0; |
| 565 | |
| 566 | dev_dbg(&adapter->dev, "%s\n", __FUNCTION__); |
| 567 | |
| 568 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { |
| 569 | err = -ENODEV; |
| 570 | goto exit; |
| 571 | } |
| 572 | |
| 573 | if (!(data = kzalloc(sizeof(struct x1205_data), GFP_KERNEL))) { |
| 574 | err = -ENOMEM; |
| 575 | goto exit; |
| 576 | } |
| 577 | |
| 578 | /* Initialize our structures */ |
| 579 | data->epoch = 2000; |
| 580 | |
| 581 | client = &data->client; |
| 582 | client->addr = address; |
| 583 | client->driver = &x1205_driver; |
| 584 | client->adapter = adapter; |
| 585 | |
| 586 | strlcpy(client->name, "x1205", I2C_NAME_SIZE); |
| 587 | |
| 588 | i2c_set_clientdata(client, data); |
| 589 | |
| 590 | /* Verify the chip is really an X1205 */ |
| 591 | if (kind < 0) { |
| 592 | if (x1205_validate_client(client) < 0) { |
| 593 | err = -ENODEV; |
| 594 | goto exit_kfree; |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | /* Inform the i2c layer */ |
| 599 | if ((err = i2c_attach_client(client))) |
| 600 | goto exit_kfree; |
| 601 | |
| 602 | list_add(&data->list, &x1205_clients); |
| 603 | |
| 604 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); |
| 605 | |
| 606 | /* If requested, set the system time */ |
| 607 | if (hctosys) |
| 608 | x1205_hctosys(client); |
| 609 | |
| 610 | return 0; |
| 611 | |
| 612 | exit_kfree: |
| 613 | kfree(data); |
| 614 | |
| 615 | exit: |
| 616 | return err; |
| 617 | } |
| 618 | |
| 619 | static int x1205_detach(struct i2c_client *client) |
| 620 | { |
| 621 | int err; |
| 622 | struct x1205_data *data = i2c_get_clientdata(client); |
| 623 | |
| 624 | dev_dbg(&client->dev, "%s\n", __FUNCTION__); |
| 625 | |
| 626 | if ((err = i2c_detach_client(client))) |
| 627 | return err; |
| 628 | |
| 629 | list_del(&data->list); |
| 630 | |
| 631 | kfree(data); |
| 632 | |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | static int x1205_command(struct i2c_client *client, unsigned int cmd, |
| 637 | void *param) |
| 638 | { |
| 639 | if (param == NULL) |
| 640 | return -EINVAL; |
| 641 | |
| 642 | if (!capable(CAP_SYS_TIME)) |
| 643 | return -EACCES; |
| 644 | |
| 645 | dev_dbg(&client->dev, "%s: cmd=%d\n", __FUNCTION__, cmd); |
| 646 | |
| 647 | switch (cmd) { |
| 648 | case X1205_CMD_GETDATETIME: |
| 649 | return x1205_get_datetime(client, param, X1205_CCR_BASE); |
| 650 | |
| 651 | case X1205_CMD_SETTIME: |
| 652 | return x1205_set_datetime(client, param, 0, |
| 653 | X1205_CCR_BASE); |
| 654 | |
| 655 | case X1205_CMD_SETDATETIME: |
| 656 | return x1205_set_datetime(client, param, 1, |
| 657 | X1205_CCR_BASE); |
| 658 | |
| 659 | case X1205_CMD_GETALARM: |
| 660 | return x1205_get_datetime(client, param, X1205_ALM0_BASE); |
| 661 | |
| 662 | case X1205_CMD_SETALARM: |
| 663 | return x1205_set_datetime(client, param, 1, |
| 664 | X1205_ALM0_BASE); |
| 665 | |
| 666 | case X1205_CMD_GETDTRIM: |
| 667 | return x1205_get_dtrim(client, param); |
| 668 | |
| 669 | case X1205_CMD_GETATRIM: |
| 670 | return x1205_get_atrim(client, param); |
| 671 | |
| 672 | default: |
| 673 | return -EINVAL; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | static int __init x1205_init(void) |
| 678 | { |
| 679 | return i2c_add_driver(&x1205_driver); |
| 680 | } |
| 681 | |
| 682 | static void __exit x1205_exit(void) |
| 683 | { |
| 684 | i2c_del_driver(&x1205_driver); |
| 685 | } |
| 686 | |
| 687 | MODULE_AUTHOR( |
| 688 | "Karen Spearel <kas11@tampabay.rr.com>, " |
| 689 | "Alessandro Zummo <a.zummo@towertech.it>"); |
| 690 | MODULE_DESCRIPTION("Xicor X1205 RTC driver"); |
| 691 | MODULE_LICENSE("GPL"); |
| 692 | MODULE_VERSION(DRV_VERSION); |
| 693 | |
| 694 | EXPORT_SYMBOL_GPL(x1205_do_command); |
| 695 | EXPORT_SYMBOL_GPL(x1205_direct_attach); |
| 696 | |
| 697 | module_init(x1205_init); |
| 698 | module_exit(x1205_exit); |