Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Chassis LCD/LED driver for HP-PARISC workstations | |
4 | * | |
5 | * (c) Copyright 2000 Red Hat Software | |
6 | * (c) Copyright 2000 Helge Deller <hdeller@redhat.com> | |
8a1def45 | 7 | * (c) Copyright 2001-2009 Helge Deller <deller@gmx.de> |
1da177e4 LT |
8 | * (c) Copyright 2001 Randolph Chung <tausq@debian.org> |
9 | * | |
1da177e4 LT |
10 | * TODO: |
11 | * - speed-up calculations with inlined assembler | |
12 | * - interface to write to second row of LCD from /proc (if technically possible) | |
13 | * | |
14 | * Changes: | |
15 | * - Audit copy_from_user in led_proc_write. | |
16 | * Daniele Bellucci <bellucda@tiscali.it> | |
34994952 GG |
17 | * - Switch from using a tasklet to a work queue, so the led_LCD_driver |
18 | * can sleep. | |
19 | * David Pye <dmp@davidmpye.dyndns.org> | |
1da177e4 LT |
20 | */ |
21 | ||
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/stddef.h> /* for offsetof() */ | |
24 | #include <linux/init.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/ioport.h> | |
27 | #include <linux/utsname.h> | |
c59ede7b | 28 | #include <linux/capability.h> |
1da177e4 LT |
29 | #include <linux/delay.h> |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/inetdevice.h> | |
32 | #include <linux/in.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/kernel_stat.h> | |
35 | #include <linux/reboot.h> | |
36 | #include <linux/proc_fs.h> | |
217bfb51 | 37 | #include <linux/seq_file.h> |
1da177e4 LT |
38 | #include <linux/ctype.h> |
39 | #include <linux/blkdev.h> | |
34994952 | 40 | #include <linux/workqueue.h> |
e5ed6399 | 41 | #include <linux/rcupdate.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <asm/processor.h> | |
44 | #include <asm/hardware.h> | |
45 | #include <asm/param.h> /* HZ */ | |
46 | #include <asm/led.h> | |
47 | #include <asm/pdc.h> | |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
1da177e4 LT |
49 | |
50 | /* The control of the LEDs and LCDs on PARISC-machines have to be done | |
34994952 GG |
51 | completely in software. The necessary calculations are done in a work queue |
52 | task which is scheduled regularly, and since the calculations may consume a | |
53 | relatively large amount of CPU time, some of the calculations can be | |
1da177e4 LT |
54 | turned off with the following variables (controlled via procfs) */ |
55 | ||
8039de10 | 56 | static int led_type __read_mostly = -1; |
34994952 | 57 | static unsigned char lastleds; /* LED state from most recent update */ |
8039de10 HD |
58 | static unsigned int led_heartbeat __read_mostly = 1; |
59 | static unsigned int led_diskio __read_mostly = 1; | |
60 | static unsigned int led_lanrxtx __read_mostly = 1; | |
61 | static char lcd_text[32] __read_mostly; | |
62 | static char lcd_text_default[32] __read_mostly; | |
79a04296 | 63 | static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */ |
1da177e4 | 64 | |
34994952 GG |
65 | |
66 | static struct workqueue_struct *led_wq; | |
6858f3bf DH |
67 | static void led_work_func(struct work_struct *); |
68 | static DECLARE_DELAYED_WORK(led_task, led_work_func); | |
34994952 | 69 | |
1da177e4 LT |
70 | #if 0 |
71 | #define DPRINTK(x) printk x | |
72 | #else | |
73 | #define DPRINTK(x) | |
74 | #endif | |
75 | ||
1da177e4 LT |
76 | struct lcd_block { |
77 | unsigned char command; /* stores the command byte */ | |
78 | unsigned char on; /* value for turning LED on */ | |
79 | unsigned char off; /* value for turning LED off */ | |
80 | }; | |
81 | ||
82 | /* Structure returned by PDC_RETURN_CHASSIS_INFO */ | |
83 | /* NOTE: we use unsigned long:16 two times, since the following member | |
84 | lcd_cmd_reg_addr needs to be 64bit aligned on 64bit PA2.0-machines */ | |
85 | struct pdc_chassis_lcd_info_ret_block { | |
86 | unsigned long model:16; /* DISPLAY_MODEL_XXXX */ | |
87 | unsigned long lcd_width:16; /* width of the LCD in chars (DISPLAY_MODEL_LCD only) */ | |
88 | unsigned long lcd_cmd_reg_addr; /* ptr to LCD cmd-register & data ptr for LED */ | |
89 | unsigned long lcd_data_reg_addr; /* ptr to LCD data-register (LCD only) */ | |
90 | unsigned int min_cmd_delay; /* delay in uS after cmd-write (LCD only) */ | |
91 | unsigned char reset_cmd1; /* command #1 for writing LCD string (LCD only) */ | |
92 | unsigned char reset_cmd2; /* command #2 for writing LCD string (LCD only) */ | |
93 | unsigned char act_enable; /* 0 = no activity (LCD only) */ | |
94 | struct lcd_block heartbeat; | |
95 | struct lcd_block disk_io; | |
96 | struct lcd_block lan_rcv; | |
97 | struct lcd_block lan_tx; | |
98 | char _pad; | |
99 | }; | |
100 | ||
101 | ||
102 | /* LCD_CMD and LCD_DATA for KittyHawk machines */ | |
103 | #define KITTYHAWK_LCD_CMD F_EXTEND(0xf0190000UL) /* 64bit-ready */ | |
104 | #define KITTYHAWK_LCD_DATA (KITTYHAWK_LCD_CMD+1) | |
105 | ||
106 | /* lcd_info is pre-initialized to the values needed to program KittyHawk LCD's | |
107 | * HP seems to have used Sharp/Hitachi HD44780 LCDs most of the time. */ | |
108 | static struct pdc_chassis_lcd_info_ret_block | |
8039de10 | 109 | lcd_info __attribute__((aligned(8))) __read_mostly = |
1da177e4 LT |
110 | { |
111 | .model = DISPLAY_MODEL_LCD, | |
112 | .lcd_width = 16, | |
113 | .lcd_cmd_reg_addr = KITTYHAWK_LCD_CMD, | |
114 | .lcd_data_reg_addr = KITTYHAWK_LCD_DATA, | |
79a04296 | 115 | .min_cmd_delay = 80, |
1da177e4 LT |
116 | .reset_cmd1 = 0x80, |
117 | .reset_cmd2 = 0xc0, | |
118 | }; | |
119 | ||
120 | ||
121 | /* direct access to some of the lcd_info variables */ | |
122 | #define LCD_CMD_REG lcd_info.lcd_cmd_reg_addr | |
123 | #define LCD_DATA_REG lcd_info.lcd_data_reg_addr | |
124 | #define LED_DATA_REG lcd_info.lcd_cmd_reg_addr /* LASI & ASP only */ | |
125 | ||
34994952 GG |
126 | #define LED_HASLCD 1 |
127 | #define LED_NOLCD 0 | |
128 | ||
129 | /* The workqueue must be created at init-time */ | |
130 | static int start_task(void) | |
131 | { | |
132 | /* Display the default text now */ | |
133 | if (led_type == LED_HASLCD) lcd_print( lcd_text_default ); | |
134 | ||
79a04296 GM |
135 | /* KittyHawk has no LED support on its LCD */ |
136 | if (lcd_no_led_support) return 0; | |
137 | ||
34994952 GG |
138 | /* Create the work queue and queue the LED task */ |
139 | led_wq = create_singlethread_workqueue("led_wq"); | |
6858f3bf | 140 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 GG |
141 | |
142 | return 0; | |
143 | } | |
144 | ||
145 | device_initcall(start_task); | |
1da177e4 LT |
146 | |
147 | /* ptr to LCD/LED-specific function */ | |
8039de10 | 148 | static void (*led_func_ptr) (unsigned char) __read_mostly; |
1da177e4 | 149 | |
1da177e4 | 150 | #ifdef CONFIG_PROC_FS |
217bfb51 | 151 | static int led_proc_show(struct seq_file *m, void *v) |
1da177e4 | 152 | { |
217bfb51 | 153 | switch ((long)m->private) |
1da177e4 LT |
154 | { |
155 | case LED_NOLCD: | |
217bfb51 AD |
156 | seq_printf(m, "Heartbeat: %d\n", led_heartbeat); |
157 | seq_printf(m, "Disk IO: %d\n", led_diskio); | |
158 | seq_printf(m, "LAN Rx/Tx: %d\n", led_lanrxtx); | |
1da177e4 LT |
159 | break; |
160 | case LED_HASLCD: | |
217bfb51 | 161 | seq_printf(m, "%s\n", lcd_text); |
1da177e4 LT |
162 | break; |
163 | default: | |
1da177e4 LT |
164 | return 0; |
165 | } | |
217bfb51 AD |
166 | return 0; |
167 | } | |
1da177e4 | 168 | |
217bfb51 AD |
169 | static int led_proc_open(struct inode *inode, struct file *file) |
170 | { | |
d9dda78b | 171 | return single_open(file, led_proc_show, PDE_DATA(inode)); |
1da177e4 LT |
172 | } |
173 | ||
217bfb51 | 174 | |
2d76978d | 175 | static ssize_t led_proc_write(struct file *file, const char __user *buf, |
217bfb51 | 176 | size_t count, loff_t *pos) |
1da177e4 | 177 | { |
d9dda78b | 178 | void *data = PDE_DATA(file_inode(file)); |
4b4fd27c | 179 | char *cur, lbuf[32]; |
1da177e4 LT |
180 | int d; |
181 | ||
182 | if (!capable(CAP_SYS_ADMIN)) | |
183 | return -EACCES; | |
184 | ||
4b4fd27c HD |
185 | if (count >= sizeof(lbuf)) |
186 | count = sizeof(lbuf)-1; | |
1da177e4 LT |
187 | |
188 | if (copy_from_user(lbuf, buf, count)) | |
189 | return -EFAULT; | |
4b4fd27c | 190 | lbuf[count] = 0; |
1da177e4 LT |
191 | |
192 | cur = lbuf; | |
193 | ||
1da177e4 LT |
194 | switch ((long)data) |
195 | { | |
196 | case LED_NOLCD: | |
197 | d = *cur++ - '0'; | |
198 | if (d != 0 && d != 1) goto parse_error; | |
199 | led_heartbeat = d; | |
200 | ||
201 | if (*cur++ != ' ') goto parse_error; | |
202 | ||
203 | d = *cur++ - '0'; | |
204 | if (d != 0 && d != 1) goto parse_error; | |
205 | led_diskio = d; | |
206 | ||
207 | if (*cur++ != ' ') goto parse_error; | |
208 | ||
209 | d = *cur++ - '0'; | |
210 | if (d != 0 && d != 1) goto parse_error; | |
211 | led_lanrxtx = d; | |
212 | ||
213 | break; | |
214 | case LED_HASLCD: | |
215 | if (*cur && cur[strlen(cur)-1] == '\n') | |
216 | cur[strlen(cur)-1] = 0; | |
217 | if (*cur == 0) | |
218 | cur = lcd_text_default; | |
219 | lcd_print(cur); | |
220 | break; | |
221 | default: | |
222 | return 0; | |
223 | } | |
224 | ||
225 | return count; | |
226 | ||
227 | parse_error: | |
228 | if ((long)data == LED_NOLCD) | |
229 | printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n"); | |
230 | return -EINVAL; | |
231 | } | |
232 | ||
97a32539 AD |
233 | static const struct proc_ops led_proc_ops = { |
234 | .proc_open = led_proc_open, | |
235 | .proc_read = seq_read, | |
236 | .proc_lseek = seq_lseek, | |
237 | .proc_release = single_release, | |
238 | .proc_write = led_proc_write, | |
217bfb51 AD |
239 | }; |
240 | ||
1da177e4 LT |
241 | static int __init led_create_procfs(void) |
242 | { | |
243 | struct proc_dir_entry *proc_pdc_root = NULL; | |
244 | struct proc_dir_entry *ent; | |
245 | ||
246 | if (led_type == -1) return -1; | |
247 | ||
2d76978d | 248 | proc_pdc_root = proc_mkdir("pdc", NULL); |
1da177e4 | 249 | if (!proc_pdc_root) return -1; |
79a04296 GM |
250 | |
251 | if (!lcd_no_led_support) | |
252 | { | |
7e07b747 | 253 | ent = proc_create_data("led", 0644, proc_pdc_root, |
97a32539 | 254 | &led_proc_ops, (void *)LED_NOLCD); /* LED */ |
79a04296 GM |
255 | if (!ent) return -1; |
256 | } | |
1da177e4 LT |
257 | |
258 | if (led_type == LED_HASLCD) | |
259 | { | |
7e07b747 | 260 | ent = proc_create_data("lcd", 0644, proc_pdc_root, |
97a32539 | 261 | &led_proc_ops, (void *)LED_HASLCD); /* LCD */ |
1da177e4 | 262 | if (!ent) return -1; |
1da177e4 LT |
263 | } |
264 | ||
265 | return 0; | |
266 | } | |
267 | #endif | |
268 | ||
269 | /* | |
270 | ** | |
271 | ** led_ASP_driver() | |
272 | ** | |
273 | */ | |
274 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ | |
275 | #define LED_STROBE 0x02 /* strobe to clock data */ | |
276 | static void led_ASP_driver(unsigned char leds) | |
277 | { | |
278 | int i; | |
279 | ||
280 | leds = ~leds; | |
281 | for (i = 0; i < 8; i++) { | |
282 | unsigned char value; | |
283 | value = (leds & 0x80) >> 7; | |
284 | gsc_writeb( value, LED_DATA_REG ); | |
285 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); | |
286 | leds <<= 1; | |
287 | } | |
288 | } | |
289 | ||
290 | ||
291 | /* | |
292 | ** | |
293 | ** led_LASI_driver() | |
294 | ** | |
295 | */ | |
296 | static void led_LASI_driver(unsigned char leds) | |
297 | { | |
298 | leds = ~leds; | |
299 | gsc_writeb( leds, LED_DATA_REG ); | |
300 | } | |
301 | ||
302 | ||
303 | /* | |
304 | ** | |
305 | ** led_LCD_driver() | |
1da177e4 LT |
306 | ** |
307 | */ | |
308 | static void led_LCD_driver(unsigned char leds) | |
309 | { | |
34994952 GG |
310 | static int i; |
311 | static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, | |
312 | LED_LAN_RCV, LED_LAN_TX }; | |
313 | ||
314 | static struct lcd_block * blockp[4] = { | |
315 | &lcd_info.heartbeat, | |
316 | &lcd_info.disk_io, | |
317 | &lcd_info.lan_rcv, | |
318 | &lcd_info.lan_tx | |
319 | }; | |
320 | ||
321 | /* Convert min_cmd_delay to milliseconds */ | |
322 | unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); | |
1da177e4 | 323 | |
34994952 GG |
324 | for (i=0; i<4; ++i) |
325 | { | |
326 | if ((leds & mask[i]) != (lastleds & mask[i])) | |
327 | { | |
328 | gsc_writeb( blockp[i]->command, LCD_CMD_REG ); | |
329 | msleep(msec_cmd_delay); | |
330 | ||
331 | gsc_writeb( leds & mask[i] ? blockp[i]->on : | |
332 | blockp[i]->off, LCD_DATA_REG ); | |
333 | msleep(msec_cmd_delay); | |
334 | } | |
1da177e4 LT |
335 | } |
336 | } | |
337 | ||
338 | ||
339 | /* | |
340 | ** | |
341 | ** led_get_net_activity() | |
342 | ** | |
93b1fae4 | 343 | ** calculate if there was TX- or RX-throughput on the network interfaces |
1da177e4 LT |
344 | ** (analog to dev_get_info() from net/core/dev.c) |
345 | ** | |
346 | */ | |
347 | static __inline__ int led_get_net_activity(void) | |
348 | { | |
349 | #ifndef CONFIG_NET | |
350 | return 0; | |
351 | #else | |
c442ef96 KM |
352 | static u64 rx_total_last, tx_total_last; |
353 | u64 rx_total, tx_total; | |
1da177e4 LT |
354 | struct net_device *dev; |
355 | int retval; | |
356 | ||
357 | rx_total = tx_total = 0; | |
358 | ||
246c65ad | 359 | /* we are running as a workqueue task, so we can use an RCU lookup */ |
e5ed6399 | 360 | rcu_read_lock(); |
246c65ad | 361 | for_each_netdev_rcu(&init_net, dev) { |
c442ef96 | 362 | const struct rtnl_link_stats64 *stats; |
28172739 | 363 | struct rtnl_link_stats64 temp; |
e5ed6399 | 364 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
365 | if (!in_dev || !in_dev->ifa_list) |
366 | continue; | |
17159b0b | 367 | if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
1da177e4 | 368 | continue; |
28172739 | 369 | stats = dev_get_stats(dev, &temp); |
1da177e4 LT |
370 | rx_total += stats->rx_packets; |
371 | tx_total += stats->tx_packets; | |
372 | } | |
e5ed6399 | 373 | rcu_read_unlock(); |
1da177e4 LT |
374 | |
375 | retval = 0; | |
376 | ||
377 | if (rx_total != rx_total_last) { | |
378 | rx_total_last = rx_total; | |
379 | retval |= LED_LAN_RCV; | |
380 | } | |
381 | ||
382 | if (tx_total != tx_total_last) { | |
383 | tx_total_last = tx_total; | |
384 | retval |= LED_LAN_TX; | |
385 | } | |
386 | ||
387 | return retval; | |
388 | #endif | |
389 | } | |
390 | ||
391 | ||
392 | /* | |
393 | ** | |
394 | ** led_get_diskio_activity() | |
395 | ** | |
396 | ** calculate if there was disk-io in the system | |
397 | ** | |
398 | */ | |
399 | static __inline__ int led_get_diskio_activity(void) | |
400 | { | |
401 | static unsigned long last_pgpgin, last_pgpgout; | |
f8891e5e | 402 | unsigned long events[NR_VM_EVENT_ITEMS]; |
1da177e4 | 403 | int changed; |
34994952 | 404 | |
f8891e5e | 405 | all_vm_events(events); |
1da177e4 LT |
406 | |
407 | /* Just use a very simple calculation here. Do not care about overflow, | |
408 | since we only want to know if there was activity or not. */ | |
f8891e5e CL |
409 | changed = (events[PGPGIN] != last_pgpgin) || |
410 | (events[PGPGOUT] != last_pgpgout); | |
411 | last_pgpgin = events[PGPGIN]; | |
412 | last_pgpgout = events[PGPGOUT]; | |
34994952 | 413 | |
1da177e4 LT |
414 | return (changed ? LED_DISK_IO : 0); |
415 | } | |
416 | ||
417 | ||
418 | ||
419 | /* | |
34994952 | 420 | ** led_work_func() |
1da177e4 | 421 | ** |
34994952 | 422 | ** manages when and which chassis LCD/LED gets updated |
1da177e4 LT |
423 | |
424 | TODO: | |
425 | - display load average (older machines like 715/64 have 4 "free" LED's for that) | |
426 | - optimizations | |
427 | */ | |
428 | ||
34994952 GG |
429 | #define HEARTBEAT_LEN (HZ*10/100) |
430 | #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) | |
1da177e4 LT |
431 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
432 | ||
34994952 | 433 | #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
1da177e4 | 434 | |
6858f3bf | 435 | static void led_work_func (struct work_struct *unused) |
1da177e4 | 436 | { |
34994952 | 437 | static unsigned long last_jiffies; |
1da177e4 | 438 | static unsigned long count_HZ; /* counter in range 0..HZ */ |
34994952 | 439 | unsigned char currentleds = 0; /* stores current value of the LEDs */ |
1da177e4 LT |
440 | |
441 | /* exit if not initialized */ | |
442 | if (!led_func_ptr) | |
443 | return; | |
444 | ||
34994952 GG |
445 | /* increment the heartbeat timekeeper */ |
446 | count_HZ += jiffies - last_jiffies; | |
447 | last_jiffies = jiffies; | |
448 | if (count_HZ >= HZ) | |
1da177e4 LT |
449 | count_HZ = 0; |
450 | ||
34994952 | 451 | if (likely(led_heartbeat)) |
1da177e4 | 452 | { |
34994952 GG |
453 | /* flash heartbeat-LED like a real heart |
454 | * (2 x short then a long delay) | |
455 | */ | |
456 | if (count_HZ < HEARTBEAT_LEN || | |
457 | (count_HZ >= HEARTBEAT_2ND_RANGE_START && | |
458 | count_HZ < HEARTBEAT_2ND_RANGE_END)) | |
459 | currentleds |= LED_HEARTBEAT; | |
1da177e4 LT |
460 | } |
461 | ||
34994952 GG |
462 | if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
463 | if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); | |
1da177e4 | 464 | |
8a1def45 HD |
465 | /* blink LEDs if we got an Oops (HPMC) */ |
466 | if (unlikely(oops_in_progress)) { | |
467 | if (boot_cpu_data.cpu_type >= pcxl2) { | |
468 | /* newer machines don't have loadavg. LEDs, so we | |
469 | * let all LEDs blink twice per second instead */ | |
470 | currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; | |
471 | } else { | |
472 | /* old machines: blink loadavg. LEDs twice per second */ | |
473 | if (count_HZ <= (HZ/2)) | |
474 | currentleds &= ~(LED4|LED5|LED6|LED7); | |
475 | else | |
476 | currentleds |= (LED4|LED5|LED6|LED7); | |
477 | } | |
478 | } | |
1da177e4 | 479 | |
34994952 GG |
480 | if (currentleds != lastleds) |
481 | { | |
482 | led_func_ptr(currentleds); /* Update the LCD/LEDs */ | |
483 | lastleds = currentleds; | |
484 | } | |
1da177e4 | 485 | |
34994952 GG |
486 | queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
487 | } | |
1da177e4 LT |
488 | |
489 | /* | |
490 | ** led_halt() | |
491 | ** | |
492 | ** called by the reboot notifier chain at shutdown and stops all | |
493 | ** LED/LCD activities. | |
494 | ** | |
495 | */ | |
496 | ||
497 | static int led_halt(struct notifier_block *, unsigned long, void *); | |
498 | ||
499 | static struct notifier_block led_notifier = { | |
500 | .notifier_call = led_halt, | |
501 | }; | |
e041c683 | 502 | static int notifier_disabled = 0; |
1da177e4 LT |
503 | |
504 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) | |
505 | { | |
506 | char *txt; | |
e041c683 AS |
507 | |
508 | if (notifier_disabled) | |
509 | return NOTIFY_OK; | |
510 | ||
511 | notifier_disabled = 1; | |
1da177e4 LT |
512 | switch (event) { |
513 | case SYS_RESTART: txt = "SYSTEM RESTART"; | |
514 | break; | |
515 | case SYS_HALT: txt = "SYSTEM HALT"; | |
516 | break; | |
517 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; | |
518 | break; | |
519 | default: return NOTIFY_DONE; | |
520 | } | |
521 | ||
34994952 GG |
522 | /* Cancel the work item and delete the queue */ |
523 | if (led_wq) { | |
8a1def45 | 524 | cancel_delayed_work_sync(&led_task); |
34994952 GG |
525 | destroy_workqueue(led_wq); |
526 | led_wq = NULL; | |
527 | } | |
528 | ||
1da177e4 LT |
529 | if (lcd_info.model == DISPLAY_MODEL_LCD) |
530 | lcd_print(txt); | |
531 | else | |
532 | if (led_func_ptr) | |
533 | led_func_ptr(0xff); /* turn all LEDs ON */ | |
534 | ||
1da177e4 LT |
535 | return NOTIFY_OK; |
536 | } | |
537 | ||
538 | /* | |
539 | ** register_led_driver() | |
540 | ** | |
541 | ** registers an external LED or LCD for usage by this driver. | |
542 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. | |
543 | ** | |
544 | */ | |
545 | ||
546 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) | |
547 | { | |
548 | static int initialized; | |
549 | ||
550 | if (initialized || !data_reg) | |
551 | return 1; | |
552 | ||
553 | lcd_info.model = model; /* store the values */ | |
554 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; | |
555 | ||
556 | switch (lcd_info.model) { | |
557 | case DISPLAY_MODEL_LCD: | |
558 | LCD_DATA_REG = data_reg; | |
559 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", | |
560 | LCD_CMD_REG , LCD_DATA_REG); | |
561 | led_func_ptr = led_LCD_driver; | |
1da177e4 LT |
562 | led_type = LED_HASLCD; |
563 | break; | |
564 | ||
565 | case DISPLAY_MODEL_LASI: | |
b4387490 HD |
566 | /* Skip to register LED in QEMU */ |
567 | if (running_on_qemu) | |
568 | return 1; | |
1da177e4 LT |
569 | LED_DATA_REG = data_reg; |
570 | led_func_ptr = led_LASI_driver; | |
571 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); | |
572 | led_type = LED_NOLCD; | |
573 | break; | |
574 | ||
575 | case DISPLAY_MODEL_OLD_ASP: | |
576 | LED_DATA_REG = data_reg; | |
577 | led_func_ptr = led_ASP_driver; | |
578 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", | |
579 | LED_DATA_REG); | |
580 | led_type = LED_NOLCD; | |
581 | break; | |
582 | ||
583 | default: | |
584 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", | |
a8043ecb | 585 | __func__, lcd_info.model); |
1da177e4 LT |
586 | return 1; |
587 | } | |
588 | ||
589 | /* mark the LCD/LED driver now as initialized and | |
590 | * register to the reboot notifier chain */ | |
591 | initialized++; | |
592 | register_reboot_notifier(&led_notifier); | |
593 | ||
34994952 GG |
594 | /* Ensure the work is queued */ |
595 | if (led_wq) { | |
6858f3bf | 596 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 GG |
597 | } |
598 | ||
1da177e4 LT |
599 | return 0; |
600 | } | |
601 | ||
602 | /* | |
603 | ** register_led_regions() | |
604 | ** | |
605 | ** register_led_regions() registers the LCD/LED regions for /procfs. | |
606 | ** At bootup - where the initialisation of the LCD/LED normally happens - | |
607 | ** not all internal structures of request_region() are properly set up, | |
608 | ** so that we delay the led-registration until after busdevices_init() | |
609 | ** has been executed. | |
610 | ** | |
611 | */ | |
612 | ||
613 | void __init register_led_regions(void) | |
614 | { | |
615 | switch (lcd_info.model) { | |
616 | case DISPLAY_MODEL_LCD: | |
617 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); | |
618 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); | |
619 | break; | |
620 | case DISPLAY_MODEL_LASI: | |
621 | case DISPLAY_MODEL_OLD_ASP: | |
622 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); | |
623 | break; | |
624 | } | |
625 | } | |
626 | ||
627 | ||
628 | /* | |
629 | ** | |
630 | ** lcd_print() | |
631 | ** | |
632 | ** Displays the given string on the LCD-Display of newer machines. | |
34994952 GG |
633 | ** lcd_print() disables/enables the timer-based led work queue to |
634 | ** avoid a race condition while writing the CMD/DATA register pair. | |
1da177e4 LT |
635 | ** |
636 | */ | |
6e16d940 | 637 | int lcd_print( const char *str ) |
1da177e4 LT |
638 | { |
639 | int i; | |
640 | ||
641 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) | |
642 | return 0; | |
643 | ||
34994952 GG |
644 | /* temporarily disable the led work task */ |
645 | if (led_wq) | |
8a1def45 | 646 | cancel_delayed_work_sync(&led_task); |
1da177e4 LT |
647 | |
648 | /* copy display string to buffer for procfs */ | |
649 | strlcpy(lcd_text, str, sizeof(lcd_text)); | |
34994952 | 650 | |
1da177e4 LT |
651 | /* Set LCD Cursor to 1st character */ |
652 | gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); | |
653 | udelay(lcd_info.min_cmd_delay); | |
654 | ||
655 | /* Print the string */ | |
656 | for (i=0; i < lcd_info.lcd_width; i++) { | |
657 | if (str && *str) | |
658 | gsc_writeb(*str++, LCD_DATA_REG); | |
659 | else | |
660 | gsc_writeb(' ', LCD_DATA_REG); | |
661 | udelay(lcd_info.min_cmd_delay); | |
662 | } | |
663 | ||
34994952 GG |
664 | /* re-queue the work */ |
665 | if (led_wq) { | |
6858f3bf | 666 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 | 667 | } |
1da177e4 LT |
668 | |
669 | return lcd_info.lcd_width; | |
670 | } | |
671 | ||
672 | /* | |
673 | ** led_init() | |
674 | ** | |
675 | ** led_init() is called very early in the bootup-process from setup.c | |
676 | ** and asks the PDC for an usable chassis LCD or LED. | |
677 | ** If the PDC doesn't return any info, then the LED | |
678 | ** is detected by lasi.c or asp.c and registered with the | |
679 | ** above functions lasi_led_init() or asp_led_init(). | |
680 | ** KittyHawk machines have often a buggy PDC, so that | |
681 | ** we explicitly check for those machines here. | |
682 | */ | |
683 | ||
684 | int __init led_init(void) | |
685 | { | |
686 | struct pdc_chassis_info chassis_info; | |
687 | int ret; | |
688 | ||
689 | snprintf(lcd_text_default, sizeof(lcd_text_default), | |
96b644bd | 690 | "Linux %s", init_utsname()->release); |
1da177e4 LT |
691 | |
692 | /* Work around the buggy PDC of KittyHawk-machines */ | |
693 | switch (CPU_HVERSION) { | |
694 | case 0x580: /* KittyHawk DC2-100 (K100) */ | |
695 | case 0x581: /* KittyHawk DC3-120 (K210) */ | |
696 | case 0x582: /* KittyHawk DC3 100 (K400) */ | |
697 | case 0x583: /* KittyHawk DC3 120 (K410) */ | |
698 | case 0x58B: /* KittyHawk DC2 100 (K200) */ | |
699 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " | |
700 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); | |
79a04296 | 701 | lcd_no_led_support = 1; |
1da177e4 LT |
702 | goto found; /* use the preinitialized values of lcd_info */ |
703 | } | |
704 | ||
705 | /* initialize the struct, so that we can check for valid return values */ | |
706 | lcd_info.model = DISPLAY_MODEL_NONE; | |
707 | chassis_info.actcnt = chassis_info.maxcnt = 0; | |
708 | ||
709 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); | |
710 | if (ret == PDC_OK) { | |
711 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " | |
712 | "lcd_width=%d, cmd_delay=%u,\n" | |
713 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", | |
714 | __FILE__, lcd_info.model, | |
715 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : | |
716 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", | |
717 | lcd_info.lcd_width, lcd_info.min_cmd_delay, | |
718 | __FILE__, sizeof(lcd_info), | |
719 | chassis_info.actcnt, chassis_info.maxcnt)); | |
720 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", | |
721 | __FILE__, lcd_info.lcd_cmd_reg_addr, | |
722 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, | |
723 | lcd_info.reset_cmd2, lcd_info.act_enable )); | |
724 | ||
725 | /* check the results. Some machines have a buggy PDC */ | |
726 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) | |
727 | goto not_found; | |
728 | ||
729 | switch (lcd_info.model) { | |
730 | case DISPLAY_MODEL_LCD: /* LCD display */ | |
731 | if (chassis_info.actcnt < | |
732 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) | |
733 | goto not_found; | |
734 | if (!lcd_info.act_enable) { | |
735 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); | |
736 | goto not_found; | |
737 | } | |
738 | break; | |
739 | ||
740 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ | |
741 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); | |
742 | goto not_found; | |
743 | ||
744 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ | |
745 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) | |
746 | goto not_found; | |
747 | break; | |
748 | ||
749 | default: | |
750 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", | |
751 | lcd_info.model); | |
752 | goto not_found; | |
753 | } /* switch() */ | |
754 | ||
755 | found: | |
756 | /* register the LCD/LED driver */ | |
757 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); | |
758 | return 0; | |
759 | ||
760 | } else { /* if() */ | |
761 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); | |
762 | } | |
763 | ||
764 | not_found: | |
765 | lcd_info.model = DISPLAY_MODEL_NONE; | |
766 | return 1; | |
767 | } | |
768 | ||
e041c683 AS |
769 | static void __exit led_exit(void) |
770 | { | |
771 | unregister_reboot_notifier(&led_notifier); | |
772 | return; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | #ifdef CONFIG_PROC_FS |
776 | module_init(led_create_procfs) | |
777 | #endif |