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1da177e4 LT |
1 | /* $Id: envctrl.c,v 1.25 2002/01/15 09:01:26 davem Exp $ |
2 | * envctrl.c: Temperature and Fan monitoring on Machines providing it. | |
3 | * | |
4 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) | |
5 | * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com) | |
6 | * VT - The implementation is to support Sun Microelectronics (SME) platform | |
7 | * environment monitoring. SME platforms use pcf8584 as the i2c bus | |
8 | * controller to access pcf8591 (8-bit A/D and D/A converter) and | |
9 | * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface). | |
10 | * At board level, it follows SME Firmware I2C Specification. Reference: | |
11 | * http://www-eu2.semiconductors.com/pip/PCF8584P | |
12 | * http://www-eu2.semiconductors.com/pip/PCF8574AP | |
13 | * http://www-eu2.semiconductors.com/pip/PCF8591P | |
14 | * | |
15 | * EB - Added support for CP1500 Global Address and PS/Voltage monitoring. | |
16 | * Eric Brower <ebrower@usa.net> | |
17 | * | |
18 | * DB - Audit every copy_to_user in envctrl_read. | |
19 | * Daniele Bellucci <bellucda@tiscali.it> | |
20 | */ | |
21 | ||
1da177e4 | 22 | #include <linux/module.h> |
1baaf0b4 | 23 | #include <linux/init.h> |
218b29e0 | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/delay.h> |
26 | #include <linux/ioport.h> | |
1da177e4 | 27 | #include <linux/miscdevice.h> |
872ec648 | 28 | #include <linux/kmod.h> |
10a0a8d4 | 29 | #include <linux/reboot.h> |
1d17bf0c | 30 | #include <linux/smp_lock.h> |
1da177e4 LT |
31 | |
32 | #include <asm/ebus.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/envctrl.h> | |
e1a39fbb | 35 | #include <asm/io.h> |
1da177e4 | 36 | |
1da177e4 LT |
37 | #define ENVCTRL_MINOR 162 |
38 | ||
39 | #define PCF8584_ADDRESS 0x55 | |
40 | ||
41 | #define CONTROL_PIN 0x80 | |
42 | #define CONTROL_ES0 0x40 | |
43 | #define CONTROL_ES1 0x20 | |
44 | #define CONTROL_ES2 0x10 | |
45 | #define CONTROL_ENI 0x08 | |
46 | #define CONTROL_STA 0x04 | |
47 | #define CONTROL_STO 0x02 | |
48 | #define CONTROL_ACK 0x01 | |
49 | ||
50 | #define STATUS_PIN 0x80 | |
51 | #define STATUS_STS 0x20 | |
52 | #define STATUS_BER 0x10 | |
53 | #define STATUS_LRB 0x08 | |
54 | #define STATUS_AD0 0x08 | |
55 | #define STATUS_AAB 0x04 | |
56 | #define STATUS_LAB 0x02 | |
57 | #define STATUS_BB 0x01 | |
58 | ||
59 | /* | |
60 | * CLK Mode Register. | |
61 | */ | |
62 | #define BUS_CLK_90 0x00 | |
63 | #define BUS_CLK_45 0x01 | |
64 | #define BUS_CLK_11 0x02 | |
65 | #define BUS_CLK_1_5 0x03 | |
66 | ||
67 | #define CLK_3 0x00 | |
68 | #define CLK_4_43 0x10 | |
69 | #define CLK_6 0x14 | |
70 | #define CLK_8 0x18 | |
71 | #define CLK_12 0x1c | |
72 | ||
73 | #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ | |
74 | #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ | |
75 | ||
76 | /* Monitor type of i2c child device. | |
77 | * Firmware definitions. | |
78 | */ | |
79 | #define PCF8584_MAX_CHANNELS 8 | |
80 | #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ | |
81 | #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ | |
82 | #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ | |
83 | #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ | |
84 | ||
85 | /* Monitor type of i2c child device. | |
86 | * Driver definitions. | |
87 | */ | |
88 | #define ENVCTRL_NOMON 0 | |
89 | #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ | |
90 | #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ | |
91 | #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ | |
92 | #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperarture */ | |
93 | /* monitor */ | |
94 | #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ | |
95 | #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ | |
96 | #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperarture */ | |
97 | #define ENVCTRL_GLOBALADDR_MON 8 /* global address */ | |
98 | ||
99 | /* Child device type. | |
100 | * Driver definitions. | |
101 | */ | |
102 | #define I2C_ADC 0 /* pcf8591 */ | |
103 | #define I2C_GPIO 1 /* pcf8571 */ | |
104 | ||
105 | /* Data read from child device may need to decode | |
106 | * through a data table and a scale. | |
107 | * Translation type as defined by firmware. | |
108 | */ | |
109 | #define ENVCTRL_TRANSLATE_NO 0 | |
110 | #define ENVCTRL_TRANSLATE_PARTIAL 1 | |
111 | #define ENVCTRL_TRANSLATE_COMBINED 2 | |
112 | #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ | |
113 | #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ | |
114 | ||
115 | /* Driver miscellaneous definitions. */ | |
116 | #define ENVCTRL_MAX_CPU 4 | |
117 | #define CHANNEL_DESC_SZ 256 | |
118 | ||
119 | /* Mask values for combined GlobalAddress/PowerStatus node */ | |
120 | #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F | |
121 | #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 | |
122 | ||
123 | /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms | |
124 | * (see envctrl_init_i2c_child) | |
125 | */ | |
126 | #define ENVCTRL_CPCI_IGNORED_NODE 0x70 | |
127 | ||
128 | #define PCF8584_DATA 0x00 | |
129 | #define PCF8584_CSR 0x01 | |
130 | ||
131 | /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. | |
132 | * Property of a port or channel as defined by the firmware. | |
133 | */ | |
134 | struct pcf8584_channel { | |
135 | unsigned char chnl_no; | |
136 | unsigned char io_direction; | |
137 | unsigned char type; | |
138 | unsigned char last; | |
139 | }; | |
140 | ||
141 | /* Each child device may have one or more tables of bytes to help decode | |
142 | * data. Table property as defined by the firmware. | |
143 | */ | |
144 | struct pcf8584_tblprop { | |
145 | unsigned int type; | |
146 | unsigned int scale; | |
147 | unsigned int offset; /* offset from the beginning of the table */ | |
148 | unsigned int size; | |
149 | }; | |
150 | ||
151 | /* i2c child */ | |
152 | struct i2c_child_t { | |
153 | /* Either ADC or GPIO. */ | |
154 | unsigned char i2ctype; | |
155 | unsigned long addr; | |
156 | struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; | |
157 | ||
158 | /* Channel info. */ | |
159 | unsigned int total_chnls; /* Number of monitor channels. */ | |
160 | unsigned char fan_mask; /* Byte mask for fan status channels. */ | |
161 | unsigned char voltage_mask; /* Byte mask for voltage status channels. */ | |
162 | struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; | |
163 | ||
164 | /* Properties of all monitor channels. */ | |
165 | unsigned int total_tbls; /* Number of monitor tables. */ | |
166 | char *tables; /* Pointer to table(s). */ | |
167 | char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ | |
168 | char mon_type[PCF8584_MAX_CHANNELS]; | |
169 | }; | |
170 | ||
171 | static void __iomem *i2c; | |
172 | static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; | |
173 | static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; | |
174 | static unsigned int warning_temperature = 0; | |
175 | static unsigned int shutdown_temperature = 0; | |
176 | static char read_cpu; | |
177 | ||
178 | /* Forward declarations. */ | |
179 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); | |
180 | ||
181 | /* Function Description: Test the PIN bit (Pending Interrupt Not) | |
182 | * to test when serial transmission is completed . | |
183 | * Return : None. | |
184 | */ | |
185 | static void envtrl_i2c_test_pin(void) | |
186 | { | |
187 | int limit = 1000000; | |
188 | ||
189 | while (--limit > 0) { | |
190 | if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) | |
191 | break; | |
192 | udelay(1); | |
193 | } | |
194 | ||
195 | if (limit <= 0) | |
196 | printk(KERN_INFO "envctrl: Pin status will not clear.\n"); | |
197 | } | |
198 | ||
199 | /* Function Description: Test busy bit. | |
200 | * Return : None. | |
201 | */ | |
202 | static void envctrl_i2c_test_bb(void) | |
203 | { | |
204 | int limit = 1000000; | |
205 | ||
206 | while (--limit > 0) { | |
207 | /* Busy bit 0 means busy. */ | |
208 | if (readb(i2c + PCF8584_CSR) & STATUS_BB) | |
209 | break; | |
210 | udelay(1); | |
211 | } | |
212 | ||
213 | if (limit <= 0) | |
214 | printk(KERN_INFO "envctrl: Busy bit will not clear.\n"); | |
215 | } | |
216 | ||
217 | /* Function Description: Send the address for a read access. | |
218 | * Return : 0 if not acknowledged, otherwise acknowledged. | |
219 | */ | |
220 | static int envctrl_i2c_read_addr(unsigned char addr) | |
221 | { | |
222 | envctrl_i2c_test_bb(); | |
223 | ||
224 | /* Load address. */ | |
225 | writeb(addr + 1, i2c + PCF8584_DATA); | |
226 | ||
227 | envctrl_i2c_test_bb(); | |
228 | ||
229 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
230 | ||
231 | /* Wait for PIN. */ | |
232 | envtrl_i2c_test_pin(); | |
233 | ||
234 | /* CSR 0 means acknowledged. */ | |
235 | if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { | |
236 | return readb(i2c + PCF8584_DATA); | |
237 | } else { | |
238 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
239 | return 0; | |
240 | } | |
241 | } | |
242 | ||
243 | /* Function Description: Send the address for write mode. | |
244 | * Return : None. | |
245 | */ | |
246 | static void envctrl_i2c_write_addr(unsigned char addr) | |
247 | { | |
248 | envctrl_i2c_test_bb(); | |
249 | writeb(addr, i2c + PCF8584_DATA); | |
250 | ||
251 | /* Generate Start condition. */ | |
252 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
253 | } | |
254 | ||
255 | /* Function Description: Read 1 byte of data from addr | |
256 | * set by envctrl_i2c_read_addr() | |
257 | * Return : Data from address set by envctrl_i2c_read_addr(). | |
258 | */ | |
259 | static unsigned char envctrl_i2c_read_data(void) | |
260 | { | |
261 | envtrl_i2c_test_pin(); | |
262 | writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ | |
263 | return readb(i2c + PCF8584_DATA); | |
264 | } | |
265 | ||
266 | /* Function Description: Instruct the device which port to read data from. | |
267 | * Return : None. | |
268 | */ | |
269 | static void envctrl_i2c_write_data(unsigned char port) | |
270 | { | |
271 | envtrl_i2c_test_pin(); | |
272 | writeb(port, i2c + PCF8584_DATA); | |
273 | } | |
274 | ||
275 | /* Function Description: Generate Stop condition after last byte is sent. | |
276 | * Return : None. | |
277 | */ | |
278 | static void envctrl_i2c_stop(void) | |
279 | { | |
280 | envtrl_i2c_test_pin(); | |
281 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
282 | } | |
283 | ||
284 | /* Function Description: Read adc device. | |
285 | * Return : Data at address and port. | |
286 | */ | |
287 | static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) | |
288 | { | |
289 | /* Send address. */ | |
290 | envctrl_i2c_write_addr(addr); | |
291 | ||
292 | /* Setup port to read. */ | |
293 | envctrl_i2c_write_data(port); | |
294 | envctrl_i2c_stop(); | |
295 | ||
296 | /* Read port. */ | |
297 | envctrl_i2c_read_addr(addr); | |
298 | ||
299 | /* Do a single byte read and send stop. */ | |
300 | envctrl_i2c_read_data(); | |
301 | envctrl_i2c_stop(); | |
302 | ||
303 | return readb(i2c + PCF8584_DATA); | |
304 | } | |
305 | ||
306 | /* Function Description: Read gpio device. | |
307 | * Return : Data at address. | |
308 | */ | |
309 | static unsigned char envctrl_i2c_read_8574(unsigned char addr) | |
310 | { | |
311 | unsigned char rd; | |
312 | ||
313 | envctrl_i2c_read_addr(addr); | |
314 | ||
315 | /* Do a single byte read and send stop. */ | |
316 | rd = envctrl_i2c_read_data(); | |
317 | envctrl_i2c_stop(); | |
318 | return rd; | |
319 | } | |
320 | ||
321 | /* Function Description: Decode data read from an adc device using firmware | |
322 | * table. | |
323 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
324 | */ | |
325 | static int envctrl_i2c_data_translate(unsigned char data, int translate_type, | |
326 | int scale, char *tbl, char *bufdata) | |
327 | { | |
328 | int len = 0; | |
329 | ||
330 | switch (translate_type) { | |
331 | case ENVCTRL_TRANSLATE_NO: | |
332 | /* No decode necessary. */ | |
333 | len = 1; | |
334 | bufdata[0] = data; | |
335 | break; | |
336 | ||
337 | case ENVCTRL_TRANSLATE_FULL: | |
338 | /* Decode this way: data = table[data]. */ | |
339 | len = 1; | |
340 | bufdata[0] = tbl[data]; | |
341 | break; | |
342 | ||
343 | case ENVCTRL_TRANSLATE_SCALE: | |
344 | /* Decode this way: data = table[data]/scale */ | |
345 | sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); | |
346 | len = strlen(bufdata); | |
347 | bufdata[len - 1] = bufdata[len - 2]; | |
348 | bufdata[len - 2] = '.'; | |
349 | break; | |
350 | ||
351 | default: | |
352 | break; | |
353 | }; | |
354 | ||
355 | return len; | |
356 | } | |
357 | ||
358 | /* Function Description: Read cpu-related data such as cpu temperature, voltage. | |
359 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
360 | */ | |
361 | static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, | |
362 | char mon_type, unsigned char *bufdata) | |
363 | { | |
364 | unsigned char data; | |
365 | int i; | |
366 | char *tbl, j = -1; | |
367 | ||
368 | /* Find the right monitor type and channel. */ | |
369 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
370 | if (pchild->mon_type[i] == mon_type) { | |
371 | if (++j == cpu) { | |
372 | break; | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | if (j != cpu) | |
378 | return 0; | |
379 | ||
380 | /* Read data from address and port. */ | |
381 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
382 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
383 | ||
384 | /* Find decoding table. */ | |
385 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
386 | ||
387 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
388 | pchild->tblprop_array[i].scale, | |
389 | tbl, bufdata); | |
390 | } | |
391 | ||
392 | /* Function Description: Read noncpu-related data such as motherboard | |
393 | * temperature. | |
394 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
395 | */ | |
396 | static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, | |
397 | char mon_type, unsigned char *bufdata) | |
398 | { | |
399 | unsigned char data; | |
400 | int i; | |
401 | char *tbl = NULL; | |
402 | ||
403 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
404 | if (pchild->mon_type[i] == mon_type) | |
405 | break; | |
406 | } | |
407 | ||
408 | if (i >= PCF8584_MAX_CHANNELS) | |
409 | return 0; | |
410 | ||
411 | /* Read data from address and port. */ | |
412 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
413 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
414 | ||
415 | /* Find decoding table. */ | |
416 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
417 | ||
418 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
419 | pchild->tblprop_array[i].scale, | |
420 | tbl, bufdata); | |
421 | } | |
422 | ||
423 | /* Function Description: Read fan status. | |
424 | * Return : Always 1 byte. Status stored in bufdata. | |
425 | */ | |
426 | static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, | |
427 | unsigned char data, | |
428 | char *bufdata) | |
429 | { | |
430 | unsigned char tmp, ret = 0; | |
431 | int i, j = 0; | |
432 | ||
433 | tmp = data & pchild->fan_mask; | |
434 | ||
435 | if (tmp == pchild->fan_mask) { | |
436 | /* All bits are on. All fans are functioning. */ | |
437 | ret = ENVCTRL_ALL_FANS_GOOD; | |
438 | } else if (tmp == 0) { | |
439 | /* No bits are on. No fans are functioning. */ | |
440 | ret = ENVCTRL_ALL_FANS_BAD; | |
441 | } else { | |
442 | /* Go through all channels, mark 'on' the matched bits. | |
443 | * Notice that fan_mask may have discontiguous bits but | |
444 | * return mask are always contiguous. For example if we | |
445 | * monitor 4 fans at channels 0,1,2,4, the return mask | |
446 | * should be 00010000 if only fan at channel 4 is working. | |
447 | */ | |
448 | for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { | |
449 | if (pchild->fan_mask & chnls_mask[i]) { | |
450 | if (!(chnls_mask[i] & tmp)) | |
451 | ret |= chnls_mask[j]; | |
452 | ||
453 | j++; | |
454 | } | |
455 | } | |
456 | } | |
457 | ||
458 | bufdata[0] = ret; | |
459 | return 1; | |
460 | } | |
461 | ||
462 | /* Function Description: Read global addressing line. | |
463 | * Return : Always 1 byte. Status stored in bufdata. | |
464 | */ | |
465 | static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, | |
466 | unsigned char data, | |
467 | char *bufdata) | |
468 | { | |
469 | /* Translatation table is not necessary, as global | |
470 | * addr is the integer value of the GA# bits. | |
471 | * | |
472 | * NOTE: MSB is documented as zero, but I see it as '1' always.... | |
473 | * | |
474 | * ----------------------------------------------- | |
475 | * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | | |
476 | * ----------------------------------------------- | |
477 | * GA0 - GA4 integer value of Global Address (backplane slot#) | |
478 | * DEG 0 = cPCI Power supply output is starting to degrade | |
479 | * 1 = cPCI Power supply output is OK | |
480 | * FAL 0 = cPCI Power supply has failed | |
481 | * 1 = cPCI Power supply output is OK | |
482 | */ | |
483 | bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); | |
484 | return 1; | |
485 | } | |
486 | ||
487 | /* Function Description: Read standard voltage and power supply status. | |
488 | * Return : Always 1 byte. Status stored in bufdata. | |
489 | */ | |
490 | static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, | |
491 | unsigned char data, | |
492 | char *bufdata) | |
493 | { | |
494 | unsigned char tmp, ret = 0; | |
495 | int i, j = 0; | |
496 | ||
497 | tmp = data & pchild->voltage_mask; | |
498 | ||
499 | /* Two channels are used to monitor voltage and power supply. */ | |
500 | if (tmp == pchild->voltage_mask) { | |
501 | /* All bits are on. Voltage and power supply are okay. */ | |
502 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; | |
503 | } else if (tmp == 0) { | |
504 | /* All bits are off. Voltage and power supply are bad */ | |
505 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD; | |
506 | } else { | |
507 | /* Either voltage or power supply has problem. */ | |
508 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
509 | if (pchild->voltage_mask & chnls_mask[i]) { | |
510 | j++; | |
511 | ||
512 | /* Break out when there is a mismatch. */ | |
513 | if (!(chnls_mask[i] & tmp)) | |
514 | break; | |
515 | } | |
516 | } | |
517 | ||
518 | /* Make a wish that hardware will always use the | |
519 | * first channel for voltage and the second for | |
520 | * power supply. | |
521 | */ | |
522 | if (j == 1) | |
523 | ret = ENVCTRL_VOLTAGE_BAD; | |
524 | else | |
525 | ret = ENVCTRL_POWERSUPPLY_BAD; | |
526 | } | |
527 | ||
528 | bufdata[0] = ret; | |
529 | return 1; | |
530 | } | |
531 | ||
532 | /* Function Description: Read a byte from /dev/envctrl. Mapped to user read(). | |
533 | * Return: Number of read bytes. 0 for error. | |
534 | */ | |
535 | static ssize_t | |
536 | envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
537 | { | |
538 | struct i2c_child_t *pchild; | |
539 | unsigned char data[10]; | |
540 | int ret = 0; | |
541 | ||
542 | /* Get the type of read as decided in ioctl() call. | |
543 | * Find the appropriate i2c child. | |
544 | * Get the data and put back to the user buffer. | |
545 | */ | |
546 | ||
547 | switch ((int)(long)file->private_data) { | |
548 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
549 | if (warning_temperature == 0) | |
550 | return 0; | |
551 | ||
552 | data[0] = (unsigned char)(warning_temperature); | |
553 | ret = 1; | |
554 | if (copy_to_user(buf, data, ret)) | |
555 | ret = -EFAULT; | |
556 | break; | |
557 | ||
558 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
559 | if (shutdown_temperature == 0) | |
560 | return 0; | |
561 | ||
562 | data[0] = (unsigned char)(shutdown_temperature); | |
563 | ret = 1; | |
564 | if (copy_to_user(buf, data, ret)) | |
565 | ret = -EFAULT; | |
566 | break; | |
567 | ||
568 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
569 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON))) | |
570 | return 0; | |
571 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data); | |
572 | if (copy_to_user(buf, data, ret)) | |
573 | ret = -EFAULT; | |
574 | break; | |
575 | ||
576 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
577 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) | |
578 | return 0; | |
579 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data); | |
580 | ||
581 | /* Reset cpu to the default cpu0. */ | |
582 | if (copy_to_user(buf, data, ret)) | |
583 | ret = -EFAULT; | |
584 | break; | |
585 | ||
586 | case ENVCTRL_RD_CPU_VOLTAGE: | |
587 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON))) | |
588 | return 0; | |
589 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data); | |
590 | ||
591 | /* Reset cpu to the default cpu0. */ | |
592 | if (copy_to_user(buf, data, ret)) | |
593 | ret = -EFAULT; | |
594 | break; | |
595 | ||
596 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
597 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON))) | |
598 | return 0; | |
599 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data); | |
600 | if (copy_to_user(buf, data, ret)) | |
601 | ret = -EFAULT; | |
602 | break; | |
603 | ||
604 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
605 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON))) | |
606 | return 0; | |
607 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data); | |
608 | if (copy_to_user(buf, data, ret)) | |
609 | ret = -EFAULT; | |
610 | break; | |
611 | ||
612 | case ENVCTRL_RD_FAN_STATUS: | |
613 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON))) | |
614 | return 0; | |
615 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
616 | ret = envctrl_i2c_fan_status(pchild,data[0], data); | |
617 | if (copy_to_user(buf, data, ret)) | |
618 | ret = -EFAULT; | |
619 | break; | |
620 | ||
621 | case ENVCTRL_RD_GLOBALADDRESS: | |
622 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
623 | return 0; | |
624 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
625 | ret = envctrl_i2c_globaladdr(pchild, data[0], data); | |
626 | if (copy_to_user(buf, data, ret)) | |
627 | ret = -EFAULT; | |
628 | break; | |
629 | ||
630 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
631 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON))) | |
632 | /* If voltage monitor not present, check for CPCI equivalent */ | |
633 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
634 | return 0; | |
635 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
636 | ret = envctrl_i2c_voltage_status(pchild, data[0], data); | |
637 | if (copy_to_user(buf, data, ret)) | |
638 | ret = -EFAULT; | |
639 | break; | |
640 | ||
641 | default: | |
642 | break; | |
643 | ||
644 | }; | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
649 | /* Function Description: Command what to read. Mapped to user ioctl(). | |
650 | * Return: Gives 0 for implemented commands, -EINVAL otherwise. | |
651 | */ | |
1928f8e5 CH |
652 | static long |
653 | envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
654 | { |
655 | char __user *infobuf; | |
656 | ||
657 | switch (cmd) { | |
658 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
659 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
660 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
661 | case ENVCTRL_RD_FAN_STATUS: | |
662 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
663 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
664 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
665 | case ENVCTRL_RD_GLOBALADDRESS: | |
666 | file->private_data = (void *)(long)cmd; | |
667 | break; | |
668 | ||
669 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
670 | case ENVCTRL_RD_CPU_VOLTAGE: | |
671 | /* Check to see if application passes in any cpu number, | |
672 | * the default is cpu0. | |
673 | */ | |
674 | infobuf = (char __user *) arg; | |
675 | if (infobuf == NULL) { | |
676 | read_cpu = 0; | |
677 | }else { | |
678 | get_user(read_cpu, infobuf); | |
679 | } | |
680 | ||
681 | /* Save the command for use when reading. */ | |
682 | file->private_data = (void *)(long)cmd; | |
683 | break; | |
684 | ||
685 | default: | |
686 | return -EINVAL; | |
687 | }; | |
688 | ||
689 | return 0; | |
690 | } | |
691 | ||
692 | /* Function Description: open device. Mapped to user open(). | |
693 | * Return: Always 0. | |
694 | */ | |
695 | static int | |
696 | envctrl_open(struct inode *inode, struct file *file) | |
697 | { | |
1d17bf0c | 698 | cycle_kernel_lock(); |
1da177e4 LT |
699 | file->private_data = NULL; |
700 | return 0; | |
701 | } | |
702 | ||
703 | /* Function Description: Open device. Mapped to user close(). | |
704 | * Return: Always 0. | |
705 | */ | |
706 | static int | |
707 | envctrl_release(struct inode *inode, struct file *file) | |
708 | { | |
709 | return 0; | |
710 | } | |
711 | ||
00977a59 | 712 | static const struct file_operations envctrl_fops = { |
1928f8e5 CH |
713 | .owner = THIS_MODULE, |
714 | .read = envctrl_read, | |
715 | .unlocked_ioctl = envctrl_ioctl, | |
716 | #ifdef CONFIG_COMPAT | |
717 | .compat_ioctl = envctrl_ioctl, | |
718 | #endif | |
719 | .open = envctrl_open, | |
720 | .release = envctrl_release, | |
1da177e4 LT |
721 | }; |
722 | ||
723 | static struct miscdevice envctrl_dev = { | |
724 | ENVCTRL_MINOR, | |
725 | "envctrl", | |
726 | &envctrl_fops | |
727 | }; | |
728 | ||
729 | /* Function Description: Set monitor type based on firmware description. | |
730 | * Return: None. | |
731 | */ | |
732 | static void envctrl_set_mon(struct i2c_child_t *pchild, | |
ccf0dec6 | 733 | const char *chnl_desc, |
1da177e4 LT |
734 | int chnl_no) |
735 | { | |
736 | /* Firmware only has temperature type. It does not distinguish | |
737 | * different kinds of temperatures. We use channel description | |
738 | * to disinguish them. | |
739 | */ | |
740 | if (!(strcmp(chnl_desc,"temp,cpu")) || | |
741 | !(strcmp(chnl_desc,"temp,cpu0")) || | |
742 | !(strcmp(chnl_desc,"temp,cpu1")) || | |
743 | !(strcmp(chnl_desc,"temp,cpu2")) || | |
744 | !(strcmp(chnl_desc,"temp,cpu3"))) | |
745 | pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON; | |
746 | ||
747 | if (!(strcmp(chnl_desc,"vddcore,cpu0")) || | |
748 | !(strcmp(chnl_desc,"vddcore,cpu1")) || | |
749 | !(strcmp(chnl_desc,"vddcore,cpu2")) || | |
750 | !(strcmp(chnl_desc,"vddcore,cpu3"))) | |
751 | pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON; | |
752 | ||
753 | if (!(strcmp(chnl_desc,"temp,motherboard"))) | |
754 | pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON; | |
755 | ||
756 | if (!(strcmp(chnl_desc,"temp,scsi"))) | |
757 | pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON; | |
758 | ||
759 | if (!(strcmp(chnl_desc,"temp,ethernet"))) | |
760 | pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON; | |
761 | } | |
762 | ||
763 | /* Function Description: Initialize monitor channel with channel desc, | |
764 | * decoding tables, monitor type, optional properties. | |
765 | * Return: None. | |
766 | */ | |
690c8fd3 | 767 | static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp) |
1da177e4 | 768 | { |
1da177e4 | 769 | int i = 0, len; |
ccf0dec6 SR |
770 | const char *pos; |
771 | const unsigned int *pval; | |
1da177e4 LT |
772 | |
773 | /* Firmware describe channels into a stream separated by a '\0'. */ | |
690c8fd3 | 774 | pos = of_get_property(dp, "channels-description", &len); |
1da177e4 LT |
775 | |
776 | while (len > 0) { | |
777 | int l = strlen(pos) + 1; | |
778 | envctrl_set_mon(pchild, pos, i++); | |
779 | len -= l; | |
780 | pos += l; | |
781 | } | |
782 | ||
783 | /* Get optional properties. */ | |
690c8fd3 DM |
784 | pval = of_get_property(dp, "warning-temp", NULL); |
785 | if (pval) | |
786 | warning_temperature = *pval; | |
787 | ||
788 | pval = of_get_property(dp, "shutdown-temp", NULL); | |
789 | if (pval) | |
790 | shutdown_temperature = *pval; | |
1da177e4 LT |
791 | } |
792 | ||
793 | /* Function Description: Initialize child device monitoring fan status. | |
794 | * Return: None. | |
795 | */ | |
796 | static void envctrl_init_fanstat(struct i2c_child_t *pchild) | |
797 | { | |
798 | int i; | |
799 | ||
800 | /* Go through all channels and set up the mask. */ | |
801 | for (i = 0; i < pchild->total_chnls; i++) | |
802 | pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
803 | ||
804 | /* We only need to know if this child has fan status monitored. | |
805 | * We don't care which channels since we have the mask already. | |
806 | */ | |
807 | pchild->mon_type[0] = ENVCTRL_FANSTAT_MON; | |
808 | } | |
809 | ||
810 | /* Function Description: Initialize child device for global addressing line. | |
811 | * Return: None. | |
812 | */ | |
813 | static void envctrl_init_globaladdr(struct i2c_child_t *pchild) | |
814 | { | |
815 | int i; | |
816 | ||
817 | /* Voltage/PowerSupply monitoring is piggybacked | |
818 | * with Global Address on CompactPCI. See comments | |
819 | * within envctrl_i2c_globaladdr for bit assignments. | |
820 | * | |
821 | * The mask is created here by assigning mask bits to each | |
822 | * bit position that represents PCF8584_VOLTAGE_TYPE data. | |
823 | * Channel numbers are not consecutive within the globaladdr | |
824 | * node (why?), so we use the actual counter value as chnls_mask | |
825 | * index instead of the chnl_array[x].chnl_no value. | |
826 | * | |
827 | * NOTE: This loop could be replaced with a constant representing | |
828 | * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK). | |
829 | */ | |
830 | for (i = 0; i < pchild->total_chnls; i++) { | |
831 | if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) { | |
832 | pchild->voltage_mask |= chnls_mask[i]; | |
833 | } | |
834 | } | |
835 | ||
836 | /* We only need to know if this child has global addressing | |
837 | * line monitored. We don't care which channels since we know | |
838 | * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK). | |
839 | */ | |
840 | pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON; | |
841 | } | |
842 | ||
843 | /* Initialize child device monitoring voltage status. */ | |
844 | static void envctrl_init_voltage_status(struct i2c_child_t *pchild) | |
845 | { | |
846 | int i; | |
847 | ||
848 | /* Go through all channels and set up the mask. */ | |
849 | for (i = 0; i < pchild->total_chnls; i++) | |
850 | pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
851 | ||
852 | /* We only need to know if this child has voltage status monitored. | |
853 | * We don't care which channels since we have the mask already. | |
854 | */ | |
855 | pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON; | |
856 | } | |
857 | ||
858 | /* Function Description: Initialize i2c child device. | |
859 | * Return: None. | |
860 | */ | |
861 | static void envctrl_init_i2c_child(struct linux_ebus_child *edev_child, | |
862 | struct i2c_child_t *pchild) | |
863 | { | |
690c8fd3 DM |
864 | int len, i, tbls_size = 0; |
865 | struct device_node *dp = edev_child->prom_node; | |
ccf0dec6 | 866 | const void *pval; |
1da177e4 LT |
867 | |
868 | /* Get device address. */ | |
690c8fd3 DM |
869 | pval = of_get_property(dp, "reg", &len); |
870 | memcpy(&pchild->addr, pval, len); | |
1da177e4 LT |
871 | |
872 | /* Get tables property. Read firmware temperature tables. */ | |
690c8fd3 DM |
873 | pval = of_get_property(dp, "translation", &len); |
874 | if (pval && len > 0) { | |
875 | memcpy(pchild->tblprop_array, pval, len); | |
1da177e4 LT |
876 | pchild->total_tbls = len / sizeof(struct pcf8584_tblprop); |
877 | for (i = 0; i < pchild->total_tbls; i++) { | |
878 | if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) { | |
879 | tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset; | |
880 | } | |
881 | } | |
882 | ||
883 | pchild->tables = kmalloc(tbls_size, GFP_KERNEL); | |
884 | if (pchild->tables == NULL){ | |
885 | printk("envctrl: Failed to allocate table.\n"); | |
886 | return; | |
887 | } | |
690c8fd3 DM |
888 | pval = of_get_property(dp, "tables", &len); |
889 | if (!pval || len <= 0) { | |
1da177e4 LT |
890 | printk("envctrl: Failed to get table.\n"); |
891 | return; | |
892 | } | |
690c8fd3 | 893 | memcpy(pchild->tables, pval, len); |
1da177e4 LT |
894 | } |
895 | ||
896 | /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04) | |
897 | * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is | |
898 | * "For Factory Use Only." | |
899 | * | |
900 | * We ignore the node on these platforms by assigning the | |
901 | * 'NULL' monitor type. | |
902 | */ | |
903 | if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) { | |
690c8fd3 | 904 | struct device_node *root_node; |
1da177e4 | 905 | int len; |
1da177e4 | 906 | |
690c8fd3 DM |
907 | root_node = of_find_node_by_path("/"); |
908 | if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) { | |
1da177e4 LT |
909 | for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { |
910 | pchild->mon_type[len] = ENVCTRL_NOMON; | |
911 | } | |
912 | return; | |
913 | } | |
914 | } | |
915 | ||
916 | /* Get the monitor channels. */ | |
690c8fd3 DM |
917 | pval = of_get_property(dp, "channels-in-use", &len); |
918 | memcpy(pchild->chnl_array, pval, len); | |
1da177e4 LT |
919 | pchild->total_chnls = len / sizeof(struct pcf8584_channel); |
920 | ||
921 | for (i = 0; i < pchild->total_chnls; i++) { | |
922 | switch (pchild->chnl_array[i].type) { | |
923 | case PCF8584_TEMP_TYPE: | |
690c8fd3 | 924 | envctrl_init_adc(pchild, dp); |
1da177e4 LT |
925 | break; |
926 | ||
927 | case PCF8584_GLOBALADDR_TYPE: | |
928 | envctrl_init_globaladdr(pchild); | |
929 | i = pchild->total_chnls; | |
930 | break; | |
931 | ||
932 | case PCF8584_FANSTAT_TYPE: | |
933 | envctrl_init_fanstat(pchild); | |
934 | i = pchild->total_chnls; | |
935 | break; | |
936 | ||
937 | case PCF8584_VOLTAGE_TYPE: | |
938 | if (pchild->i2ctype == I2C_ADC) { | |
690c8fd3 | 939 | envctrl_init_adc(pchild,dp); |
1da177e4 LT |
940 | } else { |
941 | envctrl_init_voltage_status(pchild); | |
942 | } | |
943 | i = pchild->total_chnls; | |
944 | break; | |
945 | ||
946 | default: | |
947 | break; | |
948 | }; | |
949 | } | |
950 | } | |
951 | ||
952 | /* Function Description: Search the child device list for a device. | |
953 | * Return : The i2c child if found. NULL otherwise. | |
954 | */ | |
955 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) | |
956 | { | |
957 | int i, j; | |
958 | ||
959 | for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) { | |
960 | for (j = 0; j < PCF8584_MAX_CHANNELS; j++) { | |
961 | if (i2c_childlist[i].mon_type[j] == mon_type) { | |
962 | return (struct i2c_child_t *)(&(i2c_childlist[i])); | |
963 | } | |
964 | } | |
965 | } | |
966 | return NULL; | |
967 | } | |
968 | ||
969 | static void envctrl_do_shutdown(void) | |
970 | { | |
971 | static int inprog = 0; | |
3db03b4a | 972 | int ret; |
1da177e4 LT |
973 | |
974 | if (inprog != 0) | |
975 | return; | |
976 | ||
977 | inprog = 1; | |
978 | printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); | |
10a0a8d4 | 979 | ret = orderly_poweroff(true); |
3db03b4a | 980 | if (ret < 0) { |
1da177e4 LT |
981 | printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); |
982 | inprog = 0; /* unlikely to succeed, but we could try again */ | |
983 | } | |
984 | } | |
985 | ||
986 | static struct task_struct *kenvctrld_task; | |
987 | ||
988 | static int kenvctrld(void *__unused) | |
989 | { | |
990 | int poll_interval; | |
991 | int whichcpu; | |
992 | char tempbuf[10]; | |
993 | struct i2c_child_t *cputemp; | |
994 | ||
995 | if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) { | |
996 | printk(KERN_ERR | |
997 | "envctrl: kenvctrld unable to monitor CPU temp-- exiting\n"); | |
998 | return -ENODEV; | |
999 | } | |
1000 | ||
cb39d263 | 1001 | poll_interval = 5000; /* TODO env_mon_interval */ |
1da177e4 | 1002 | |
1da177e4 LT |
1003 | printk(KERN_INFO "envctrl: %s starting...\n", current->comm); |
1004 | for (;;) { | |
218b29e0 | 1005 | msleep_interruptible(poll_interval); |
1da177e4 | 1006 | |
218b29e0 CH |
1007 | if (kthread_should_stop()) |
1008 | break; | |
1009 | ||
1da177e4 LT |
1010 | for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) { |
1011 | if (0 < envctrl_read_cpu_info(whichcpu, cputemp, | |
1012 | ENVCTRL_CPUTEMP_MON, | |
1013 | tempbuf)) { | |
1014 | if (tempbuf[0] >= shutdown_temperature) { | |
1015 | printk(KERN_CRIT | |
1016 | "%s: WARNING: CPU%i temperature %i C meets or exceeds "\ | |
1017 | "shutdown threshold %i C\n", | |
1018 | current->comm, whichcpu, | |
1019 | tempbuf[0], shutdown_temperature); | |
1020 | envctrl_do_shutdown(); | |
1021 | } | |
1022 | } | |
1023 | } | |
1024 | } | |
1025 | printk(KERN_INFO "envctrl: %s exiting...\n", current->comm); | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | static int __init envctrl_init(void) | |
1030 | { | |
1da177e4 LT |
1031 | struct linux_ebus *ebus = NULL; |
1032 | struct linux_ebus_device *edev = NULL; | |
1033 | struct linux_ebus_child *edev_child = NULL; | |
1034 | int err, i = 0; | |
1035 | ||
1036 | for_each_ebus(ebus) { | |
1037 | for_each_ebusdev(edev, ebus) { | |
690c8fd3 | 1038 | if (!strcmp(edev->prom_node->name, "bbc")) { |
1da177e4 LT |
1039 | /* If we find a boot-bus controller node, |
1040 | * then this envctrl driver is not for us. | |
1041 | */ | |
1042 | return -ENODEV; | |
1043 | } | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | /* Traverse through ebus and ebus device list for i2c device and | |
1048 | * adc and gpio nodes. | |
1049 | */ | |
1050 | for_each_ebus(ebus) { | |
1051 | for_each_ebusdev(edev, ebus) { | |
690c8fd3 | 1052 | if (!strcmp(edev->prom_node->name, "i2c")) { |
1da177e4 LT |
1053 | i2c = ioremap(edev->resource[0].start, 0x2); |
1054 | for_each_edevchild(edev, edev_child) { | |
690c8fd3 | 1055 | if (!strcmp("gpio", edev_child->prom_node->name)) { |
1da177e4 LT |
1056 | i2c_childlist[i].i2ctype = I2C_GPIO; |
1057 | envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); | |
1058 | } | |
690c8fd3 | 1059 | if (!strcmp("adc", edev_child->prom_node->name)) { |
1da177e4 LT |
1060 | i2c_childlist[i].i2ctype = I2C_ADC; |
1061 | envctrl_init_i2c_child(edev_child, &(i2c_childlist[i++])); | |
1062 | } | |
1063 | } | |
1064 | goto done; | |
1065 | } | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | done: | |
1070 | if (!edev) { | |
1071 | printk("envctrl: I2C device not found.\n"); | |
1072 | return -ENODEV; | |
1073 | } | |
1074 | ||
1075 | /* Set device address. */ | |
1076 | writeb(CONTROL_PIN, i2c + PCF8584_CSR); | |
1077 | writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); | |
1078 | ||
1079 | /* Set system clock and SCL frequencies. */ | |
1080 | writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); | |
1081 | writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); | |
1082 | ||
1083 | /* Enable serial interface. */ | |
1084 | writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); | |
1085 | udelay(200); | |
1086 | ||
1087 | /* Register the device as a minor miscellaneous device. */ | |
1088 | err = misc_register(&envctrl_dev); | |
1089 | if (err) { | |
1090 | printk("envctrl: Unable to get misc minor %d\n", | |
1091 | envctrl_dev.minor); | |
1092 | goto out_iounmap; | |
1093 | } | |
1094 | ||
1095 | /* Note above traversal routine post-incremented 'i' to accommodate | |
1096 | * a next child device, so we decrement before reverse-traversal of | |
1097 | * child devices. | |
1098 | */ | |
1099 | printk("envctrl: initialized "); | |
1100 | for (--i; i >= 0; --i) { | |
1101 | printk("[%s 0x%lx]%s", | |
1102 | (I2C_ADC == i2c_childlist[i].i2ctype) ? ("adc") : | |
1103 | ((I2C_GPIO == i2c_childlist[i].i2ctype) ? ("gpio") : ("unknown")), | |
1104 | i2c_childlist[i].addr, (0 == i) ? ("\n") : (" ")); | |
1105 | } | |
1106 | ||
218b29e0 CH |
1107 | kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); |
1108 | if (IS_ERR(kenvctrld_task)) { | |
38c1844b | 1109 | err = PTR_ERR(kenvctrld_task); |
1da177e4 | 1110 | goto out_deregister; |
218b29e0 | 1111 | } |
1da177e4 LT |
1112 | |
1113 | return 0; | |
1114 | ||
1115 | out_deregister: | |
1116 | misc_deregister(&envctrl_dev); | |
1117 | out_iounmap: | |
1118 | iounmap(i2c); | |
6044ec88 JJ |
1119 | for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) |
1120 | kfree(i2c_childlist[i].tables); | |
1121 | ||
1da177e4 | 1122 | return err; |
1da177e4 LT |
1123 | } |
1124 | ||
1125 | static void __exit envctrl_cleanup(void) | |
1126 | { | |
1127 | int i; | |
1128 | ||
218b29e0 | 1129 | kthread_stop(kenvctrld_task); |
1da177e4 LT |
1130 | |
1131 | iounmap(i2c); | |
1132 | misc_deregister(&envctrl_dev); | |
1133 | ||
6044ec88 JJ |
1134 | for (i = 0; i < ENVCTRL_MAX_CPU * 2; i++) |
1135 | kfree(i2c_childlist[i].tables); | |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | module_init(envctrl_init); | |
1139 | module_exit(envctrl_cleanup); | |
1140 | MODULE_LICENSE("GPL"); |