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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 | ||
217bfb51 AD |
233 | static const struct file_operations led_proc_fops = { |
234 | .owner = THIS_MODULE, | |
235 | .open = led_proc_open, | |
236 | .read = seq_read, | |
237 | .llseek = seq_lseek, | |
238 | .release = single_release, | |
239 | .write = led_proc_write, | |
240 | }; | |
241 | ||
1da177e4 LT |
242 | static int __init led_create_procfs(void) |
243 | { | |
244 | struct proc_dir_entry *proc_pdc_root = NULL; | |
245 | struct proc_dir_entry *ent; | |
246 | ||
247 | if (led_type == -1) return -1; | |
248 | ||
2d76978d | 249 | proc_pdc_root = proc_mkdir("pdc", NULL); |
1da177e4 | 250 | if (!proc_pdc_root) return -1; |
79a04296 GM |
251 | |
252 | if (!lcd_no_led_support) | |
253 | { | |
254 | ent = proc_create_data("led", S_IRUGO|S_IWUSR, proc_pdc_root, | |
255 | &led_proc_fops, (void *)LED_NOLCD); /* LED */ | |
256 | if (!ent) return -1; | |
257 | } | |
1da177e4 LT |
258 | |
259 | if (led_type == LED_HASLCD) | |
260 | { | |
217bfb51 AD |
261 | ent = proc_create_data("lcd", S_IRUGO|S_IWUSR, proc_pdc_root, |
262 | &led_proc_fops, (void *)LED_HASLCD); /* LCD */ | |
1da177e4 | 263 | if (!ent) return -1; |
1da177e4 LT |
264 | } |
265 | ||
266 | return 0; | |
267 | } | |
268 | #endif | |
269 | ||
270 | /* | |
271 | ** | |
272 | ** led_ASP_driver() | |
273 | ** | |
274 | */ | |
275 | #define LED_DATA 0x01 /* data to shift (0:on 1:off) */ | |
276 | #define LED_STROBE 0x02 /* strobe to clock data */ | |
277 | static void led_ASP_driver(unsigned char leds) | |
278 | { | |
279 | int i; | |
280 | ||
281 | leds = ~leds; | |
282 | for (i = 0; i < 8; i++) { | |
283 | unsigned char value; | |
284 | value = (leds & 0x80) >> 7; | |
285 | gsc_writeb( value, LED_DATA_REG ); | |
286 | gsc_writeb( value | LED_STROBE, LED_DATA_REG ); | |
287 | leds <<= 1; | |
288 | } | |
289 | } | |
290 | ||
291 | ||
292 | /* | |
293 | ** | |
294 | ** led_LASI_driver() | |
295 | ** | |
296 | */ | |
297 | static void led_LASI_driver(unsigned char leds) | |
298 | { | |
299 | leds = ~leds; | |
300 | gsc_writeb( leds, LED_DATA_REG ); | |
301 | } | |
302 | ||
303 | ||
304 | /* | |
305 | ** | |
306 | ** led_LCD_driver() | |
1da177e4 LT |
307 | ** |
308 | */ | |
309 | static void led_LCD_driver(unsigned char leds) | |
310 | { | |
34994952 GG |
311 | static int i; |
312 | static unsigned char mask[4] = { LED_HEARTBEAT, LED_DISK_IO, | |
313 | LED_LAN_RCV, LED_LAN_TX }; | |
314 | ||
315 | static struct lcd_block * blockp[4] = { | |
316 | &lcd_info.heartbeat, | |
317 | &lcd_info.disk_io, | |
318 | &lcd_info.lan_rcv, | |
319 | &lcd_info.lan_tx | |
320 | }; | |
321 | ||
322 | /* Convert min_cmd_delay to milliseconds */ | |
323 | unsigned int msec_cmd_delay = 1 + (lcd_info.min_cmd_delay / 1000); | |
1da177e4 | 324 | |
34994952 GG |
325 | for (i=0; i<4; ++i) |
326 | { | |
327 | if ((leds & mask[i]) != (lastleds & mask[i])) | |
328 | { | |
329 | gsc_writeb( blockp[i]->command, LCD_CMD_REG ); | |
330 | msleep(msec_cmd_delay); | |
331 | ||
332 | gsc_writeb( leds & mask[i] ? blockp[i]->on : | |
333 | blockp[i]->off, LCD_DATA_REG ); | |
334 | msleep(msec_cmd_delay); | |
335 | } | |
1da177e4 LT |
336 | } |
337 | } | |
338 | ||
339 | ||
340 | /* | |
341 | ** | |
342 | ** led_get_net_activity() | |
343 | ** | |
93b1fae4 | 344 | ** calculate if there was TX- or RX-throughput on the network interfaces |
1da177e4 LT |
345 | ** (analog to dev_get_info() from net/core/dev.c) |
346 | ** | |
347 | */ | |
348 | static __inline__ int led_get_net_activity(void) | |
349 | { | |
350 | #ifndef CONFIG_NET | |
351 | return 0; | |
352 | #else | |
c442ef96 KM |
353 | static u64 rx_total_last, tx_total_last; |
354 | u64 rx_total, tx_total; | |
1da177e4 LT |
355 | struct net_device *dev; |
356 | int retval; | |
357 | ||
358 | rx_total = tx_total = 0; | |
359 | ||
246c65ad | 360 | /* we are running as a workqueue task, so we can use an RCU lookup */ |
e5ed6399 | 361 | rcu_read_lock(); |
246c65ad | 362 | for_each_netdev_rcu(&init_net, dev) { |
c442ef96 | 363 | const struct rtnl_link_stats64 *stats; |
28172739 | 364 | struct rtnl_link_stats64 temp; |
e5ed6399 | 365 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
366 | if (!in_dev || !in_dev->ifa_list) |
367 | continue; | |
17159b0b | 368 | if (ipv4_is_loopback(in_dev->ifa_list->ifa_local)) |
1da177e4 | 369 | continue; |
28172739 | 370 | stats = dev_get_stats(dev, &temp); |
1da177e4 LT |
371 | rx_total += stats->rx_packets; |
372 | tx_total += stats->tx_packets; | |
373 | } | |
e5ed6399 | 374 | rcu_read_unlock(); |
1da177e4 LT |
375 | |
376 | retval = 0; | |
377 | ||
378 | if (rx_total != rx_total_last) { | |
379 | rx_total_last = rx_total; | |
380 | retval |= LED_LAN_RCV; | |
381 | } | |
382 | ||
383 | if (tx_total != tx_total_last) { | |
384 | tx_total_last = tx_total; | |
385 | retval |= LED_LAN_TX; | |
386 | } | |
387 | ||
388 | return retval; | |
389 | #endif | |
390 | } | |
391 | ||
392 | ||
393 | /* | |
394 | ** | |
395 | ** led_get_diskio_activity() | |
396 | ** | |
397 | ** calculate if there was disk-io in the system | |
398 | ** | |
399 | */ | |
400 | static __inline__ int led_get_diskio_activity(void) | |
401 | { | |
402 | static unsigned long last_pgpgin, last_pgpgout; | |
f8891e5e | 403 | unsigned long events[NR_VM_EVENT_ITEMS]; |
1da177e4 | 404 | int changed; |
34994952 | 405 | |
f8891e5e | 406 | all_vm_events(events); |
1da177e4 LT |
407 | |
408 | /* Just use a very simple calculation here. Do not care about overflow, | |
409 | since we only want to know if there was activity or not. */ | |
f8891e5e CL |
410 | changed = (events[PGPGIN] != last_pgpgin) || |
411 | (events[PGPGOUT] != last_pgpgout); | |
412 | last_pgpgin = events[PGPGIN]; | |
413 | last_pgpgout = events[PGPGOUT]; | |
34994952 | 414 | |
1da177e4 LT |
415 | return (changed ? LED_DISK_IO : 0); |
416 | } | |
417 | ||
418 | ||
419 | ||
420 | /* | |
34994952 | 421 | ** led_work_func() |
1da177e4 | 422 | ** |
34994952 | 423 | ** manages when and which chassis LCD/LED gets updated |
1da177e4 LT |
424 | |
425 | TODO: | |
426 | - display load average (older machines like 715/64 have 4 "free" LED's for that) | |
427 | - optimizations | |
428 | */ | |
429 | ||
34994952 GG |
430 | #define HEARTBEAT_LEN (HZ*10/100) |
431 | #define HEARTBEAT_2ND_RANGE_START (HZ*28/100) | |
1da177e4 LT |
432 | #define HEARTBEAT_2ND_RANGE_END (HEARTBEAT_2ND_RANGE_START + HEARTBEAT_LEN) |
433 | ||
34994952 | 434 | #define LED_UPDATE_INTERVAL (1 + (HZ*19/1000)) |
1da177e4 | 435 | |
6858f3bf | 436 | static void led_work_func (struct work_struct *unused) |
1da177e4 | 437 | { |
34994952 | 438 | static unsigned long last_jiffies; |
1da177e4 | 439 | static unsigned long count_HZ; /* counter in range 0..HZ */ |
34994952 | 440 | unsigned char currentleds = 0; /* stores current value of the LEDs */ |
1da177e4 LT |
441 | |
442 | /* exit if not initialized */ | |
443 | if (!led_func_ptr) | |
444 | return; | |
445 | ||
34994952 GG |
446 | /* increment the heartbeat timekeeper */ |
447 | count_HZ += jiffies - last_jiffies; | |
448 | last_jiffies = jiffies; | |
449 | if (count_HZ >= HZ) | |
1da177e4 LT |
450 | count_HZ = 0; |
451 | ||
34994952 | 452 | if (likely(led_heartbeat)) |
1da177e4 | 453 | { |
34994952 GG |
454 | /* flash heartbeat-LED like a real heart |
455 | * (2 x short then a long delay) | |
456 | */ | |
457 | if (count_HZ < HEARTBEAT_LEN || | |
458 | (count_HZ >= HEARTBEAT_2ND_RANGE_START && | |
459 | count_HZ < HEARTBEAT_2ND_RANGE_END)) | |
460 | currentleds |= LED_HEARTBEAT; | |
1da177e4 LT |
461 | } |
462 | ||
34994952 GG |
463 | if (likely(led_lanrxtx)) currentleds |= led_get_net_activity(); |
464 | if (likely(led_diskio)) currentleds |= led_get_diskio_activity(); | |
1da177e4 | 465 | |
8a1def45 HD |
466 | /* blink LEDs if we got an Oops (HPMC) */ |
467 | if (unlikely(oops_in_progress)) { | |
468 | if (boot_cpu_data.cpu_type >= pcxl2) { | |
469 | /* newer machines don't have loadavg. LEDs, so we | |
470 | * let all LEDs blink twice per second instead */ | |
471 | currentleds = (count_HZ <= (HZ/2)) ? 0 : 0xff; | |
472 | } else { | |
473 | /* old machines: blink loadavg. LEDs twice per second */ | |
474 | if (count_HZ <= (HZ/2)) | |
475 | currentleds &= ~(LED4|LED5|LED6|LED7); | |
476 | else | |
477 | currentleds |= (LED4|LED5|LED6|LED7); | |
478 | } | |
479 | } | |
1da177e4 | 480 | |
34994952 GG |
481 | if (currentleds != lastleds) |
482 | { | |
483 | led_func_ptr(currentleds); /* Update the LCD/LEDs */ | |
484 | lastleds = currentleds; | |
485 | } | |
1da177e4 | 486 | |
34994952 GG |
487 | queue_delayed_work(led_wq, &led_task, LED_UPDATE_INTERVAL); |
488 | } | |
1da177e4 LT |
489 | |
490 | /* | |
491 | ** led_halt() | |
492 | ** | |
493 | ** called by the reboot notifier chain at shutdown and stops all | |
494 | ** LED/LCD activities. | |
495 | ** | |
496 | */ | |
497 | ||
498 | static int led_halt(struct notifier_block *, unsigned long, void *); | |
499 | ||
500 | static struct notifier_block led_notifier = { | |
501 | .notifier_call = led_halt, | |
502 | }; | |
e041c683 | 503 | static int notifier_disabled = 0; |
1da177e4 LT |
504 | |
505 | static int led_halt(struct notifier_block *nb, unsigned long event, void *buf) | |
506 | { | |
507 | char *txt; | |
e041c683 AS |
508 | |
509 | if (notifier_disabled) | |
510 | return NOTIFY_OK; | |
511 | ||
512 | notifier_disabled = 1; | |
1da177e4 LT |
513 | switch (event) { |
514 | case SYS_RESTART: txt = "SYSTEM RESTART"; | |
515 | break; | |
516 | case SYS_HALT: txt = "SYSTEM HALT"; | |
517 | break; | |
518 | case SYS_POWER_OFF: txt = "SYSTEM POWER OFF"; | |
519 | break; | |
520 | default: return NOTIFY_DONE; | |
521 | } | |
522 | ||
34994952 GG |
523 | /* Cancel the work item and delete the queue */ |
524 | if (led_wq) { | |
8a1def45 | 525 | cancel_delayed_work_sync(&led_task); |
34994952 GG |
526 | destroy_workqueue(led_wq); |
527 | led_wq = NULL; | |
528 | } | |
529 | ||
1da177e4 LT |
530 | if (lcd_info.model == DISPLAY_MODEL_LCD) |
531 | lcd_print(txt); | |
532 | else | |
533 | if (led_func_ptr) | |
534 | led_func_ptr(0xff); /* turn all LEDs ON */ | |
535 | ||
1da177e4 LT |
536 | return NOTIFY_OK; |
537 | } | |
538 | ||
539 | /* | |
540 | ** register_led_driver() | |
541 | ** | |
542 | ** registers an external LED or LCD for usage by this driver. | |
543 | ** currently only LCD-, LASI- and ASP-style LCD/LED's are supported. | |
544 | ** | |
545 | */ | |
546 | ||
547 | int __init register_led_driver(int model, unsigned long cmd_reg, unsigned long data_reg) | |
548 | { | |
549 | static int initialized; | |
550 | ||
551 | if (initialized || !data_reg) | |
552 | return 1; | |
553 | ||
554 | lcd_info.model = model; /* store the values */ | |
555 | LCD_CMD_REG = (cmd_reg == LED_CMD_REG_NONE) ? 0 : cmd_reg; | |
556 | ||
557 | switch (lcd_info.model) { | |
558 | case DISPLAY_MODEL_LCD: | |
559 | LCD_DATA_REG = data_reg; | |
560 | printk(KERN_INFO "LCD display at %lx,%lx registered\n", | |
561 | LCD_CMD_REG , LCD_DATA_REG); | |
562 | led_func_ptr = led_LCD_driver; | |
1da177e4 LT |
563 | led_type = LED_HASLCD; |
564 | break; | |
565 | ||
566 | case DISPLAY_MODEL_LASI: | |
b4387490 HD |
567 | /* Skip to register LED in QEMU */ |
568 | if (running_on_qemu) | |
569 | return 1; | |
1da177e4 LT |
570 | LED_DATA_REG = data_reg; |
571 | led_func_ptr = led_LASI_driver; | |
572 | printk(KERN_INFO "LED display at %lx registered\n", LED_DATA_REG); | |
573 | led_type = LED_NOLCD; | |
574 | break; | |
575 | ||
576 | case DISPLAY_MODEL_OLD_ASP: | |
577 | LED_DATA_REG = data_reg; | |
578 | led_func_ptr = led_ASP_driver; | |
579 | printk(KERN_INFO "LED (ASP-style) display at %lx registered\n", | |
580 | LED_DATA_REG); | |
581 | led_type = LED_NOLCD; | |
582 | break; | |
583 | ||
584 | default: | |
585 | printk(KERN_ERR "%s: Wrong LCD/LED model %d !\n", | |
a8043ecb | 586 | __func__, lcd_info.model); |
1da177e4 LT |
587 | return 1; |
588 | } | |
589 | ||
590 | /* mark the LCD/LED driver now as initialized and | |
591 | * register to the reboot notifier chain */ | |
592 | initialized++; | |
593 | register_reboot_notifier(&led_notifier); | |
594 | ||
34994952 GG |
595 | /* Ensure the work is queued */ |
596 | if (led_wq) { | |
6858f3bf | 597 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 GG |
598 | } |
599 | ||
1da177e4 LT |
600 | return 0; |
601 | } | |
602 | ||
603 | /* | |
604 | ** register_led_regions() | |
605 | ** | |
606 | ** register_led_regions() registers the LCD/LED regions for /procfs. | |
607 | ** At bootup - where the initialisation of the LCD/LED normally happens - | |
608 | ** not all internal structures of request_region() are properly set up, | |
609 | ** so that we delay the led-registration until after busdevices_init() | |
610 | ** has been executed. | |
611 | ** | |
612 | */ | |
613 | ||
614 | void __init register_led_regions(void) | |
615 | { | |
616 | switch (lcd_info.model) { | |
617 | case DISPLAY_MODEL_LCD: | |
618 | request_mem_region((unsigned long)LCD_CMD_REG, 1, "lcd_cmd"); | |
619 | request_mem_region((unsigned long)LCD_DATA_REG, 1, "lcd_data"); | |
620 | break; | |
621 | case DISPLAY_MODEL_LASI: | |
622 | case DISPLAY_MODEL_OLD_ASP: | |
623 | request_mem_region((unsigned long)LED_DATA_REG, 1, "led_data"); | |
624 | break; | |
625 | } | |
626 | } | |
627 | ||
628 | ||
629 | /* | |
630 | ** | |
631 | ** lcd_print() | |
632 | ** | |
633 | ** Displays the given string on the LCD-Display of newer machines. | |
34994952 GG |
634 | ** lcd_print() disables/enables the timer-based led work queue to |
635 | ** avoid a race condition while writing the CMD/DATA register pair. | |
1da177e4 LT |
636 | ** |
637 | */ | |
6e16d940 | 638 | int lcd_print( const char *str ) |
1da177e4 LT |
639 | { |
640 | int i; | |
641 | ||
642 | if (!led_func_ptr || lcd_info.model != DISPLAY_MODEL_LCD) | |
643 | return 0; | |
644 | ||
34994952 GG |
645 | /* temporarily disable the led work task */ |
646 | if (led_wq) | |
8a1def45 | 647 | cancel_delayed_work_sync(&led_task); |
1da177e4 LT |
648 | |
649 | /* copy display string to buffer for procfs */ | |
650 | strlcpy(lcd_text, str, sizeof(lcd_text)); | |
34994952 | 651 | |
1da177e4 LT |
652 | /* Set LCD Cursor to 1st character */ |
653 | gsc_writeb(lcd_info.reset_cmd1, LCD_CMD_REG); | |
654 | udelay(lcd_info.min_cmd_delay); | |
655 | ||
656 | /* Print the string */ | |
657 | for (i=0; i < lcd_info.lcd_width; i++) { | |
658 | if (str && *str) | |
659 | gsc_writeb(*str++, LCD_DATA_REG); | |
660 | else | |
661 | gsc_writeb(' ', LCD_DATA_REG); | |
662 | udelay(lcd_info.min_cmd_delay); | |
663 | } | |
664 | ||
34994952 GG |
665 | /* re-queue the work */ |
666 | if (led_wq) { | |
6858f3bf | 667 | queue_delayed_work(led_wq, &led_task, 0); |
34994952 | 668 | } |
1da177e4 LT |
669 | |
670 | return lcd_info.lcd_width; | |
671 | } | |
672 | ||
673 | /* | |
674 | ** led_init() | |
675 | ** | |
676 | ** led_init() is called very early in the bootup-process from setup.c | |
677 | ** and asks the PDC for an usable chassis LCD or LED. | |
678 | ** If the PDC doesn't return any info, then the LED | |
679 | ** is detected by lasi.c or asp.c and registered with the | |
680 | ** above functions lasi_led_init() or asp_led_init(). | |
681 | ** KittyHawk machines have often a buggy PDC, so that | |
682 | ** we explicitly check for those machines here. | |
683 | */ | |
684 | ||
685 | int __init led_init(void) | |
686 | { | |
687 | struct pdc_chassis_info chassis_info; | |
688 | int ret; | |
689 | ||
690 | snprintf(lcd_text_default, sizeof(lcd_text_default), | |
96b644bd | 691 | "Linux %s", init_utsname()->release); |
1da177e4 LT |
692 | |
693 | /* Work around the buggy PDC of KittyHawk-machines */ | |
694 | switch (CPU_HVERSION) { | |
695 | case 0x580: /* KittyHawk DC2-100 (K100) */ | |
696 | case 0x581: /* KittyHawk DC3-120 (K210) */ | |
697 | case 0x582: /* KittyHawk DC3 100 (K400) */ | |
698 | case 0x583: /* KittyHawk DC3 120 (K410) */ | |
699 | case 0x58B: /* KittyHawk DC2 100 (K200) */ | |
700 | printk(KERN_INFO "%s: KittyHawk-Machine (hversion 0x%x) found, " | |
701 | "LED detection skipped.\n", __FILE__, CPU_HVERSION); | |
79a04296 | 702 | lcd_no_led_support = 1; |
1da177e4 LT |
703 | goto found; /* use the preinitialized values of lcd_info */ |
704 | } | |
705 | ||
706 | /* initialize the struct, so that we can check for valid return values */ | |
707 | lcd_info.model = DISPLAY_MODEL_NONE; | |
708 | chassis_info.actcnt = chassis_info.maxcnt = 0; | |
709 | ||
710 | ret = pdc_chassis_info(&chassis_info, &lcd_info, sizeof(lcd_info)); | |
711 | if (ret == PDC_OK) { | |
712 | DPRINTK((KERN_INFO "%s: chassis info: model=%d (%s), " | |
713 | "lcd_width=%d, cmd_delay=%u,\n" | |
714 | "%s: sizecnt=%d, actcnt=%ld, maxcnt=%ld\n", | |
715 | __FILE__, lcd_info.model, | |
716 | (lcd_info.model==DISPLAY_MODEL_LCD) ? "LCD" : | |
717 | (lcd_info.model==DISPLAY_MODEL_LASI) ? "LED" : "unknown", | |
718 | lcd_info.lcd_width, lcd_info.min_cmd_delay, | |
719 | __FILE__, sizeof(lcd_info), | |
720 | chassis_info.actcnt, chassis_info.maxcnt)); | |
721 | DPRINTK((KERN_INFO "%s: cmd=%p, data=%p, reset1=%x, reset2=%x, act_enable=%d\n", | |
722 | __FILE__, lcd_info.lcd_cmd_reg_addr, | |
723 | lcd_info.lcd_data_reg_addr, lcd_info.reset_cmd1, | |
724 | lcd_info.reset_cmd2, lcd_info.act_enable )); | |
725 | ||
726 | /* check the results. Some machines have a buggy PDC */ | |
727 | if (chassis_info.actcnt <= 0 || chassis_info.actcnt != chassis_info.maxcnt) | |
728 | goto not_found; | |
729 | ||
730 | switch (lcd_info.model) { | |
731 | case DISPLAY_MODEL_LCD: /* LCD display */ | |
732 | if (chassis_info.actcnt < | |
733 | offsetof(struct pdc_chassis_lcd_info_ret_block, _pad)-1) | |
734 | goto not_found; | |
735 | if (!lcd_info.act_enable) { | |
736 | DPRINTK((KERN_INFO "PDC prohibited usage of the LCD.\n")); | |
737 | goto not_found; | |
738 | } | |
739 | break; | |
740 | ||
741 | case DISPLAY_MODEL_NONE: /* no LED or LCD available */ | |
742 | printk(KERN_INFO "PDC reported no LCD or LED.\n"); | |
743 | goto not_found; | |
744 | ||
745 | case DISPLAY_MODEL_LASI: /* Lasi style 8 bit LED display */ | |
746 | if (chassis_info.actcnt != 8 && chassis_info.actcnt != 32) | |
747 | goto not_found; | |
748 | break; | |
749 | ||
750 | default: | |
751 | printk(KERN_WARNING "PDC reported unknown LCD/LED model %d\n", | |
752 | lcd_info.model); | |
753 | goto not_found; | |
754 | } /* switch() */ | |
755 | ||
756 | found: | |
757 | /* register the LCD/LED driver */ | |
758 | register_led_driver(lcd_info.model, LCD_CMD_REG, LCD_DATA_REG); | |
759 | return 0; | |
760 | ||
761 | } else { /* if() */ | |
762 | DPRINTK((KERN_INFO "pdc_chassis_info call failed with retval = %d\n", ret)); | |
763 | } | |
764 | ||
765 | not_found: | |
766 | lcd_info.model = DISPLAY_MODEL_NONE; | |
767 | return 1; | |
768 | } | |
769 | ||
e041c683 AS |
770 | static void __exit led_exit(void) |
771 | { | |
772 | unregister_reboot_notifier(&led_notifier); | |
773 | return; | |
774 | } | |
775 | ||
1da177e4 LT |
776 | #ifdef CONFIG_PROC_FS |
777 | module_init(led_create_procfs) | |
778 | #endif |