| 1 | /* |
| 2 | * Chassis LCD/LED driver for HP-PARISC workstations |
| 3 | * |
| 4 | * (c) Copyright 2000 Red Hat Software |
| 5 | * (c) Copyright 2000 Helge Deller <hdeller@redhat.com> |
| 6 | * (c) Copyright 2001-2009 Helge Deller <deller@gmx.de> |
| 7 | * (c) Copyright 2001 Randolph Chung <tausq@debian.org> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * TODO: |
| 15 | * - speed-up calculations with inlined assembler |
| 16 | * - interface to write to second row of LCD from /proc (if technically possible) |
| 17 | * |
| 18 | * Changes: |
| 19 | * - Audit copy_from_user in led_proc_write. |
| 20 | * Daniele Bellucci <bellucda@tiscali.it> |
| 21 | * - Switch from using a tasklet to a work queue, so the led_LCD_driver |
| 22 | * can sleep. |
| 23 | * David Pye <dmp@davidmpye.dyndns.org> |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/stddef.h> /* for offsetof() */ |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/types.h> |
| 30 | #include <linux/ioport.h> |
| 31 | #include <linux/utsname.h> |
| 32 | #include <linux/capability.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/netdevice.h> |
| 35 | #include <linux/inetdevice.h> |
| 36 | #include <linux/in.h> |
| 37 | #include <linux/interrupt.h> |
| 38 | #include <linux/kernel_stat.h> |
| 39 | #include <linux/reboot.h> |
| 40 | #include <linux/proc_fs.h> |
| 41 | #include <linux/ctype.h> |
| 42 | #include <linux/blkdev.h> |
| 43 | #include <linux/workqueue.h> |
| 44 | #include <linux/rcupdate.h> |
| 45 | #include <asm/io.h> |
| 46 | #include <asm/processor.h> |
| 47 | #include <asm/hardware.h> |
| 48 | #include <asm/param.h> /* HZ */ |
| 49 | #include <asm/led.h> |
| 50 | #include <asm/pdc.h> |
| 51 | #include <asm/uaccess.h> |
| 52 | |
| 53 | /* The control of the LEDs and LCDs on PARISC-machines have to be done |
| 54 | completely in software. The necessary calculations are done in a work queue |
| 55 | task which is scheduled regularly, and since the calculations may consume a |
| 56 | relatively large amount of CPU time, some of the calculations can be |
| 57 | turned off with the following variables (controlled via procfs) */ |
| 58 | |
| 59 | static int led_type __read_mostly = -1; |
| 60 | static unsigned char lastleds; /* LED state from most recent update */ |
| 61 | static unsigned int led_heartbeat __read_mostly = 1; |
| 62 | static unsigned int led_diskio __read_mostly = 1; |
| 63 | static unsigned int led_lanrxtx __read_mostly = 1; |
| 64 | static char lcd_text[32] __read_mostly; |
| 65 | static char lcd_text_default[32] __read_mostly; |
| 66 | |
| 67 | |
| 68 | static struct workqueue_struct *led_wq; |
| 69 | static void led_work_func(struct work_struct *); |
| 70 | static DECLARE_DELAYED_WORK(led_task, led_work_func); |
| 71 | |
| 72 | #if 0 |
| 73 | #define DPRINTK(x) printk x |
| 74 | #else |
| 75 | #define DPRINTK(x) |
| 76 | #endif |
| 77 | |
| 78 | struct lcd_block { |
| 79 | unsigned char command; /* stores the command byte */ |
| 80 | unsigned char on; /* value for turning LED on */ |
| 81 | unsigned char off; /* value for turning LED off */ |
| 82 | }; |
| 83 | |
| 84 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ |
| 85 | /* NOTE: we use unsigned long:16 two times, since the following member |
| 86 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ |
| 87 | struct pdc_chassis_lcd_info_ret_block { |
| 88 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ |
| 89 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ |
| 90 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ |
| 91 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ |
| 92 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ |
| 93 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ |
| 94 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ |
| 95 | unsigned char act_enable; /* 0 = no activity (LCD only) */ |
| 96 | struct lcd_block heartbeat; |
| 97 | struct lcd_block disk_io; |
| 98 | struct lcd_block lan_rcv; |
| 99 | struct lcd_block lan_tx; |
| 100 | char _pad; |
| 101 | }; |
| 102 | |
| 103 | |
| 104 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ |
| 105 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ |
| 106 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) |
| 107 | |
| 108 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's |
| 109 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ |
| 110 | static struct pdc_chassis_lcd_info_ret_block |
| 111 | lcd_info __attribute__((aligned(8))) __read_mostly = |
| 112 | { |
| 113 | .model = DISPLAY_MODEL_LCD, |
| 114 | .lcd_width = 16, |
| 115 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, |
| 116 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, |
| 117 | .min_cmd_delay = 40, |
| 118 | .reset_cmd1 = 0x80, |
| 119 | .reset_cmd2 = 0xc0, |
| 120 | }; |
| 121 | |
| 122 | |
| 123 | /* direct access to some of the lcd_info variables */ |
| 124 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr |
| 125 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr |
| 126 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ |
| 127 | |
| 128 | #define LED_HASLCD 1 |
| 129 | #define LED_NOLCD 0 |
| 130 | |
| 131 | /* The workqueue must be created at init-time */ |
| 132 | static int start_task(void) |
| 133 | { |
| 134 | /* Display the default text now */ |
| 135 | if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); |
| 136 | |
| 137 | /* Create the work queue and queue the LED task */ |
| 138 | led_wq = create_singlethread_workqueue("led_wq"); |
| 139 | queue_delayed_work(led_wq, &led_task, 0); |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | device_initcall(start_task); |
| 145 | |
| 146 | /* ptr to LCD/LED-specific function */ |
| 147 | static void (*led_func_ptr) (unsigned char) __read_mostly; |
| 148 | |
| 149 | #ifdef CONFIG_PROC_FS |
| 150 | static int led_proc_read(char *page, char **start, off_t off, int count, |
| 151 | int *eof, void *data) |
| 152 | { |
| 153 | char *out = page; |
| 154 | int len; |
| 155 | |
| 156 | switch ((long)data) |
| 157 | { |
| 158 | case LED_NOLCD: |
| 159 | out += sprintf(out, "Heartbeat: %d\n", led_heartbeat); |
| 160 | out += sprintf(out, "Disk IO: %d\n", led_diskio); |
| 161 | out += sprintf(out, "LAN Rx/Tx: %d\n", led_lanrxtx); |
| 162 | break; |
| 163 | case LED_HASLCD: |
| 164 | out += sprintf(out, "%s\n", lcd_text); |
| 165 | break; |
| 166 | default: |
| 167 | *eof = 1; |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | len = out - page - off; |
| 172 | if (len < count) { |
| 173 | *eof = 1; |
| 174 | if (len <= 0) return 0; |
| 175 | } else { |
| 176 | len = count; |
| 177 | } |
| 178 | *start = page + off; |
| 179 | return len; |
| 180 | } |
| 181 | |
| 182 | static int led_proc_write(struct file *file, const char *buf, |
| 183 | unsigned long count, void *data) |
| 184 | { |
| 185 | char *cur, lbuf[count + 1]; |
| 186 | int d; |
| 187 | |
| 188 | if (!capable(CAP_SYS_ADMIN)) |
| 189 | return -EACCES; |
| 190 | |
| 191 | memset(lbuf, 0, count + 1); |
| 192 | |
| 193 | if (copy_from_user(lbuf, buf, count)) |
| 194 | return -EFAULT; |
| 195 | |
| 196 | cur = lbuf; |
| 197 | |
| 198 | switch ((long)data) |
| 199 | { |
| 200 | case LED_NOLCD: |
| 201 | d = *cur++ - '0'; |
| 202 | if (d != 0 && d != 1) goto parse_error; |
| 203 | led_heartbeat = d; |
| 204 | |
| 205 | if (*cur++ != ' ') goto parse_error; |
| 206 | |
| 207 | d = *cur++ - '0'; |
| 208 | if (d != 0 && d != 1) goto parse_error; |
| 209 | led_diskio = d; |
| 210 | |
| 211 | if (*cur++ != ' ') goto parse_error; |
| 212 | |
| 213 | d = *cur++ - '0'; |
| 214 | if (d != 0 && d != 1) goto parse_error; |
| 215 | led_lanrxtx = d; |
| 216 | |
| 217 | break; |
| 218 | case LED_HASLCD: |
| 219 | if (*cur && cur[strlen(cur)-1] == '\n') |
| 220 | cur[strlen(cur)-1] = 0; |
| 221 | if (*cur == 0) |
| 222 | cur = lcd_text_default; |
| 223 | lcd_print(cur); |
| 224 | break; |
| 225 | default: |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | return count; |
| 230 | |
| 231 | parse_error: |
| 232 | if ((long)data == LED_NOLCD) |
| 233 | printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); |
| 234 | return -EINVAL; |
| 235 | } |
| 236 | |
| 237 | static int __init led_create_procfs(void) |
| 238 | { |
| 239 | struct proc_dir_entry *proc_pdc_root = NULL; |
| 240 | struct proc_dir_entry *ent; |
| 241 | |
| 242 | if (led_type == -1) return -1; |
| 243 | |
| 244 | proc_pdc_root = proc_mkdir("pdc", 0); |
| 245 | if (!proc_pdc_root) return -1; |
| 246 | ent = create_proc_entry("led", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); |
| 247 | if (!ent) return -1; |
| 248 | ent->data = (void *)LED_NOLCD; /* LED */ |
| 249 | ent->read_proc = led_proc_read; |
| 250 | ent->write_proc = led_proc_write; |
| 251 | |
| 252 | if (led_type == LED_HASLCD) |
| 253 | { |
| 254 | ent = create_proc_entry("lcd", S_IFREG|S_IRUGO|S_IWUSR, proc_pdc_root); |
| 255 | if (!ent) return -1; |
| 256 | ent->data = (void *)LED_HASLCD; /* LCD */ |
| 257 | ent->read_proc = led_proc_read; |
| 258 | ent->write_proc = led_proc_write; |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | #endif |
| 264 | |
| 265 | /* |
| 266 | ** |
| 267 | ** led_ASP_driver() |
| 268 | ** |
| 269 | */ |
| 270 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ |
| 271 | #define LED_STROBE 0x02 /* strobe to clock data */ |
| 272 | static void led_ASP_driver(unsigned char leds) |
| 273 | { |
| 274 | int i; |
| 275 | |
| 276 | leds = ~leds; |
| 277 | for (i = 0; i < 8; i++) { |
| 278 | unsigned char value; |
| 279 | value = (leds & 0x80) >> 7; |
| 280 | gsc_writeb( value, LED_DATA_REG ); |
| 281 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); |
| 282 | leds <<= 1; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | |
| 287 | /* |
| 288 | ** |
| 289 | ** led_LASI_driver() |
| 290 | ** |
| 291 | */ |
| 292 | static void led_LASI_driver(unsigned char leds) |
| 293 | { |
| 294 | leds = ~leds; |
| 295 | gsc_writeb( leds, LED_DATA_REG ); |
| 296 | } |
| 297 | |
| 298 | |
| 299 | /* |
| 300 | ** |
| 301 | ** led_LCD_driver() |
| 302 | ** |
| 303 | */ |
| 304 | static void led_LCD_driver(unsigned char leds) |
| 305 | { |
| 306 | static int i; |
| 307 | static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, |
| 308 | LED_LAN_RCV, LED_LAN_TX }; |
| 309 | |
| 310 | static struct lcd_block * blockp[4] = { |
| 311 | &lcd_info.heartbeat, |
| 312 | &lcd_info.disk_io, |
| 313 | &lcd_info.lan_rcv, |
| 314 | &lcd_info.lan_tx |
| 315 | }; |
| 316 | |
| 317 | /* Convert min_cmd_delay to milliseconds */ |
| 318 | unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); |
| 319 | |
| 320 | for (i=0; i<4; ++i) |
| 321 | { |
| 322 | if ((leds & mask[i]) != (lastleds & mask[i])) |
| 323 | { |
| 324 | gsc_writeb( blockp[i]->command, LCD_CMD_REG ); |
| 325 | msleep(msec_cmd_delay); |
| 326 | |
| 327 | gsc_writeb( leds & mask[i] ? blockp[i]->on : |
| 328 | blockp[i]->off, LCD_DATA_REG ); |
| 329 | msleep(msec_cmd_delay); |
| 330 | } |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | |
| 335 | /* |
| 336 | ** |
| 337 | ** led_get_net_activity() |
| 338 | ** |
| 339 | ** calculate if there was TX- or RX-throughput on the network interfaces |
| 340 | ** (analog to dev_get_info() from net/core/dev.c) |
| 341 | ** |
| 342 | */ |
| 343 | static __inline__ int led_get_net_activity(void) |
| 344 | { |
| 345 | #ifndef CONFIG_NET |
| 346 | return 0; |
| 347 | #else |
| 348 | static unsigned long rx_total_last, tx_total_last; |
| 349 | unsigned long rx_total, tx_total; |
| 350 | struct net_device *dev; |
| 351 | int retval; |
| 352 | |
| 353 | rx_total = tx_total = 0; |
| 354 | |
| 355 | /* we are running as a workqueue task, so locking dev_base |
| 356 | * for reading should be OK */ |
| 357 | read_lock(&dev_base_lock); |
| 358 | rcu_read_lock(); |
| 359 | for_each_netdev(&init_net, dev) { |
| 360 | const struct net_device_stats *stats; |
| 361 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
| 362 | if (!in_dev || !in_dev->ifa_list) |
| 363 | continue; |
| 364 | if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
| 365 | continue; |
| 366 | stats = dev_get_stats(dev); |
| 367 | rx_total += stats->rx_packets; |
| 368 | tx_total += stats->tx_packets; |
| 369 | } |
| 370 | rcu_read_unlock(); |
| 371 | read_unlock(&dev_base_lock); |
| 372 | |
| 373 | retval = 0; |
| 374 | |
| 375 | if (rx_total != rx_total_last) { |
| 376 | rx_total_last = rx_total; |
| 377 | retval |= LED_LAN_RCV; |
| 378 | } |
| 379 | |
| 380 | if (tx_total != tx_total_last) { |
| 381 | tx_total_last = tx_total; |
| 382 | retval |= LED_LAN_TX; |
| 383 | } |
| 384 | |
| 385 | return retval; |
| 386 | #endif |
| 387 | } |
| 388 | |
| 389 | |
| 390 | /* |
| 391 | ** |
| 392 | ** led_get_diskio_activity() |
| 393 | ** |
| 394 | ** calculate if there was disk-io in the system |
| 395 | ** |
| 396 | */ |
| 397 | static __inline__ int led_get_diskio_activity(void) |
| 398 | { |
| 399 | static unsigned long last_pgpgin, last_pgpgout; |
| 400 | unsigned long events[NR_VM_EVENT_ITEMS]; |
| 401 | int changed; |
| 402 | |
| 403 | all_vm_events(events); |
| 404 | |
| 405 | /* Just use a very simple calculation here. Do not care about overflow, |
| 406 | since we only want to know if there was activity or not. */ |
| 407 | changed = (events[PGPGIN] != last_pgpgin) || |
| 408 | (events[PGPGOUT] != last_pgpgout); |
| 409 | last_pgpgin = events[PGPGIN]; |
| 410 | last_pgpgout = events[PGPGOUT]; |
| 411 | |
| 412 | return (changed ? LED_DISK_IO : 0); |
| 413 | } |
| 414 | |
| 415 | |
| 416 | |
| 417 | /* |
| 418 | ** led_work_func() |
| 419 | ** |
| 420 | ** manages when and which chassis LCD/LED gets updated |
| 421 | |
| 422 | TODO: |
| 423 | - display load average (older machines like 715/64 have 4 "free" LED's for that) |
| 424 | - optimizations |
| 425 | */ |
| 426 | |
| 427 | #define HEARTBEAT_LEN (HZ*10/100) |
| 428 | #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) |
| 429 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
| 430 | |
| 431 | #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
| 432 | |
| 433 | static void led_work_func (struct work_struct *unused) |
| 434 | { |
| 435 | static unsigned long last_jiffies; |
| 436 | static unsigned long count_HZ; /* counter in range 0..HZ */ |
| 437 | unsigned char currentleds = 0; /* stores current value of the LEDs */ |
| 438 | |
| 439 | /* exit if not initialized */ |
| 440 | if (!led_func_ptr) |
| 441 | return; |
| 442 | |
| 443 | /* increment the heartbeat timekeeper */ |
| 444 | count_HZ += jiffies - last_jiffies; |
| 445 | last_jiffies = jiffies; |
| 446 | if (count_HZ >= HZ) |
| 447 | count_HZ = 0; |
| 448 | |
| 449 | if (likely(led_heartbeat)) |
| 450 | { |
| 451 | /* flash heartbeat-LED like a real heart |
| 452 | * (2 x short then a long delay) |
| 453 | */ |
| 454 | if (count_HZ < HEARTBEAT_LEN || |
| 455 | (count_HZ >= HEARTBEAT_2ND_RANGE_START && |
| 456 | count_HZ < HEARTBEAT_2ND_RANGE_END)) |
| 457 | currentleds |= LED_HEARTBEAT; |
| 458 | } |
| 459 | |
| 460 | if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
| 461 | if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); |
| 462 | |
| 463 | /* blink LEDs if we got an Oops (HPMC) */ |
| 464 | if (unlikely(oops_in_progress)) { |
| 465 | if (boot_cpu_data.cpu_type >= pcxl2) { |
| 466 | /* newer machines don't have loadavg. LEDs, so we |
| 467 | * let all LEDs blink twice per second instead */ |
| 468 | currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; |
| 469 | } else { |
| 470 | /* old machines: blink loadavg. LEDs twice per second */ |
| 471 | if (count_HZ <= (HZ/2)) |
| 472 | currentleds &= ~(LED4|LED5|LED6|LED7); |
| 473 | else |
| 474 | currentleds |= (LED4|LED5|LED6|LED7); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | if (currentleds != lastleds) |
| 479 | { |
| 480 | led_func_ptr(currentleds); /* Update the LCD/LEDs */ |
| 481 | lastleds = currentleds; |
| 482 | } |
| 483 | |
| 484 | queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | ** led_halt() |
| 489 | ** |
| 490 | ** called by the reboot notifier chain at shutdown and stops all |
| 491 | ** LED/LCD activities. |
| 492 | ** |
| 493 | */ |
| 494 | |
| 495 | static int led_halt(struct notifier_block *, unsigned long, void *); |
| 496 | |
| 497 | static struct notifier_block led_notifier = { |
| 498 | .notifier_call = led_halt, |
| 499 | }; |
| 500 | static int notifier_disabled = 0; |
| 501 | |
| 502 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) |
| 503 | { |
| 504 | char *txt; |
| 505 | |
| 506 | if (notifier_disabled) |
| 507 | return NOTIFY_OK; |
| 508 | |
| 509 | notifier_disabled = 1; |
| 510 | switch (event) { |
| 511 | case SYS_RESTART: txt = "SYSTEM RESTART"; |
| 512 | break; |
| 513 | case SYS_HALT: txt = "SYSTEM HALT"; |
| 514 | break; |
| 515 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; |
| 516 | break; |
| 517 | default: return NOTIFY_DONE; |
| 518 | } |
| 519 | |
| 520 | /* Cancel the work item and delete the queue */ |
| 521 | if (led_wq) { |
| 522 | cancel_delayed_work_sync(&led_task); |
| 523 | destroy_workqueue(led_wq); |
| 524 | led_wq = NULL; |
| 525 | } |
| 526 | |
| 527 | if (lcd_info.model == DISPLAY_MODEL_LCD) |
| 528 | lcd_print(txt); |
| 529 | else |
| 530 | if (led_func_ptr) |
| 531 | led_func_ptr(0xff); /* turn all LEDs ON */ |
| 532 | |
| 533 | return NOTIFY_OK; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | ** register_led_driver() |
| 538 | ** |
| 539 | ** registers an external LED or LCD for usage by this driver. |
| 540 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. |
| 541 | ** |
| 542 | */ |
| 543 | |
| 544 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) |
| 545 | { |
| 546 | static int initialized; |
| 547 | |
| 548 | if (initialized || !data_reg) |
| 549 | return 1; |
| 550 | |
| 551 | lcd_info.model = model; /* store the values */ |
| 552 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; |
| 553 | |
| 554 | switch (lcd_info.model) { |
| 555 | case DISPLAY_MODEL_LCD: |
| 556 | LCD_DATA_REG = data_reg; |
| 557 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", |
| 558 | LCD_CMD_REG , LCD_DATA_REG); |
| 559 | led_func_ptr = led_LCD_driver; |
| 560 | led_type = LED_HASLCD; |
| 561 | break; |
| 562 | |
| 563 | case DISPLAY_MODEL_LASI: |
| 564 | LED_DATA_REG = data_reg; |
| 565 | led_func_ptr = led_LASI_driver; |
| 566 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); |
| 567 | led_type = LED_NOLCD; |
| 568 | break; |
| 569 | |
| 570 | case DISPLAY_MODEL_OLD_ASP: |
| 571 | LED_DATA_REG = data_reg; |
| 572 | led_func_ptr = led_ASP_driver; |
| 573 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", |
| 574 | LED_DATA_REG); |
| 575 | led_type = LED_NOLCD; |
| 576 | break; |
| 577 | |
| 578 | default: |
| 579 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", |
| 580 | __func__, lcd_info.model); |
| 581 | return 1; |
| 582 | } |
| 583 | |
| 584 | /* mark the LCD/LED driver now as initialized and |
| 585 | * register to the reboot notifier chain */ |
| 586 | initialized++; |
| 587 | register_reboot_notifier(&led_notifier); |
| 588 | |
| 589 | /* Ensure the work is queued */ |
| 590 | if (led_wq) { |
| 591 | queue_delayed_work(led_wq, &led_task, 0); |
| 592 | } |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | /* |
| 598 | ** register_led_regions() |
| 599 | ** |
| 600 | ** register_led_regions() registers the LCD/LED regions for /procfs. |
| 601 | ** At bootup - where the initialisation of the LCD/LED normally happens - |
| 602 | ** not all internal structures of request_region() are properly set up, |
| 603 | ** so that we delay the led-registration until after busdevices_init() |
| 604 | ** has been executed. |
| 605 | ** |
| 606 | */ |
| 607 | |
| 608 | void __init register_led_regions(void) |
| 609 | { |
| 610 | switch (lcd_info.model) { |
| 611 | case DISPLAY_MODEL_LCD: |
| 612 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); |
| 613 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); |
| 614 | break; |
| 615 | case DISPLAY_MODEL_LASI: |
| 616 | case DISPLAY_MODEL_OLD_ASP: |
| 617 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); |
| 618 | break; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | |
| 623 | /* |
| 624 | ** |
| 625 | ** lcd_print() |
| 626 | ** |
| 627 | ** Displays the given string on the LCD-Display of newer machines. |
| 628 | ** lcd_print() disables/enables the timer-based led work queue to |
| 629 | ** avoid a race condition while writing the CMD/DATA register pair. |
| 630 | ** |
| 631 | */ |
| 632 | int lcd_print( const char *str ) |
| 633 | { |
| 634 | int i; |
| 635 | |
| 636 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) |
| 637 | return 0; |
| 638 | |
| 639 | /* temporarily disable the led work task */ |
| 640 | if (led_wq) |
| 641 | cancel_delayed_work_sync(&led_task); |
| 642 | |
| 643 | /* copy display string to buffer for procfs */ |
| 644 | strlcpy(lcd_text, str, sizeof(lcd_text)); |
| 645 | |
| 646 | /* Set LCD Cursor to 1st character */ |
| 647 | gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); |
| 648 | udelay(lcd_info.min_cmd_delay); |
| 649 | |
| 650 | /* Print the string */ |
| 651 | for (i=0; i < lcd_info.lcd_width; i++) { |
| 652 | if (str && *str) |
| 653 | gsc_writeb(*str++, LCD_DATA_REG); |
| 654 | else |
| 655 | gsc_writeb(' ', LCD_DATA_REG); |
| 656 | udelay(lcd_info.min_cmd_delay); |
| 657 | } |
| 658 | |
| 659 | /* re-queue the work */ |
| 660 | if (led_wq) { |
| 661 | queue_delayed_work(led_wq, &led_task, 0); |
| 662 | } |
| 663 | |
| 664 | return lcd_info.lcd_width; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | ** led_init() |
| 669 | ** |
| 670 | ** led_init() is called very early in the bootup-process from setup.c |
| 671 | ** and asks the PDC for an usable chassis LCD or LED. |
| 672 | ** If the PDC doesn't return any info, then the LED |
| 673 | ** is detected by lasi.c or asp.c and registered with the |
| 674 | ** above functions lasi_led_init() or asp_led_init(). |
| 675 | ** KittyHawk machines have often a buggy PDC, so that |
| 676 | ** we explicitly check for those machines here. |
| 677 | */ |
| 678 | |
| 679 | int __init led_init(void) |
| 680 | { |
| 681 | struct pdc_chassis_info chassis_info; |
| 682 | int ret; |
| 683 | |
| 684 | snprintf(lcd_text_default, sizeof(lcd_text_default), |
| 685 | "Linux %s", init_utsname()->release); |
| 686 | |
| 687 | /* Work around the buggy PDC of KittyHawk-machines */ |
| 688 | switch (CPU_HVERSION) { |
| 689 | case 0x580: /* KittyHawk DC2-100 (K100) */ |
| 690 | case 0x581: /* KittyHawk DC3-120 (K210) */ |
| 691 | case 0x582: /* KittyHawk DC3 100 (K400) */ |
| 692 | case 0x583: /* KittyHawk DC3 120 (K410) */ |
| 693 | case 0x58B: /* KittyHawk DC2 100 (K200) */ |
| 694 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " |
| 695 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); |
| 696 | goto found; /* use the preinitialized values of lcd_info */ |
| 697 | } |
| 698 | |
| 699 | /* initialize the struct, so that we can check for valid return values */ |
| 700 | lcd_info.model = DISPLAY_MODEL_NONE; |
| 701 | chassis_info.actcnt = chassis_info.maxcnt = 0; |
| 702 | |
| 703 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); |
| 704 | if (ret == PDC_OK) { |
| 705 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " |
| 706 | "lcd_width=%d, cmd_delay=%u,\n" |
| 707 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", |
| 708 | __FILE__, lcd_info.model, |
| 709 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : |
| 710 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", |
| 711 | lcd_info.lcd_width, lcd_info.min_cmd_delay, |
| 712 | __FILE__, sizeof(lcd_info), |
| 713 | chassis_info.actcnt, chassis_info.maxcnt)); |
| 714 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", |
| 715 | __FILE__, lcd_info.lcd_cmd_reg_addr, |
| 716 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, |
| 717 | lcd_info.reset_cmd2, lcd_info.act_enable )); |
| 718 | |
| 719 | /* check the results. Some machines have a buggy PDC */ |
| 720 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) |
| 721 | goto not_found; |
| 722 | |
| 723 | switch (lcd_info.model) { |
| 724 | case DISPLAY_MODEL_LCD: /* LCD display */ |
| 725 | if (chassis_info.actcnt < |
| 726 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) |
| 727 | goto not_found; |
| 728 | if (!lcd_info.act_enable) { |
| 729 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); |
| 730 | goto not_found; |
| 731 | } |
| 732 | break; |
| 733 | |
| 734 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ |
| 735 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); |
| 736 | goto not_found; |
| 737 | |
| 738 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ |
| 739 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) |
| 740 | goto not_found; |
| 741 | break; |
| 742 | |
| 743 | default: |
| 744 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", |
| 745 | lcd_info.model); |
| 746 | goto not_found; |
| 747 | } /* switch() */ |
| 748 | |
| 749 | found: |
| 750 | /* register the LCD/LED driver */ |
| 751 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); |
| 752 | return 0; |
| 753 | |
| 754 | } else { /* if() */ |
| 755 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); |
| 756 | } |
| 757 | |
| 758 | not_found: |
| 759 | lcd_info.model = DISPLAY_MODEL_NONE; |
| 760 | return 1; |
| 761 | } |
| 762 | |
| 763 | static void __exit led_exit(void) |
| 764 | { |
| 765 | unregister_reboot_notifier(&led_notifier); |
| 766 | return; |
| 767 | } |
| 768 | |
| 769 | #ifdef CONFIG_PROC_FS |
| 770 | module_init(led_create_procfs) |
| 771 | #endif |