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