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6b8c90f2 | 1 | /* envctrl.c: Temperature and Fan monitoring on Machines providing it. |
1da177e4 LT |
2 | * |
3 | * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) | |
4 | * Copyright (C) 2000 Vinh Truong (vinh.truong@eng.sun.com) | |
5 | * VT - The implementation is to support Sun Microelectronics (SME) platform | |
6 | * environment monitoring. SME platforms use pcf8584 as the i2c bus | |
7 | * controller to access pcf8591 (8-bit A/D and D/A converter) and | |
8 | * pcf8571 (256 x 8-bit static low-voltage RAM with I2C-bus interface). | |
9 | * At board level, it follows SME Firmware I2C Specification. Reference: | |
10 | * http://www-eu2.semiconductors.com/pip/PCF8584P | |
11 | * http://www-eu2.semiconductors.com/pip/PCF8574AP | |
12 | * http://www-eu2.semiconductors.com/pip/PCF8591P | |
13 | * | |
14 | * EB - Added support for CP1500 Global Address and PS/Voltage monitoring. | |
15 | * Eric Brower <ebrower@usa.net> | |
16 | * | |
17 | * DB - Audit every copy_to_user in envctrl_read. | |
18 | * Daniele Bellucci <bellucda@tiscali.it> | |
19 | */ | |
20 | ||
1da177e4 | 21 | #include <linux/module.h> |
1baaf0b4 | 22 | #include <linux/init.h> |
218b29e0 | 23 | #include <linux/kthread.h> |
1da177e4 LT |
24 | #include <linux/delay.h> |
25 | #include <linux/ioport.h> | |
1da177e4 | 26 | #include <linux/miscdevice.h> |
872ec648 | 27 | #include <linux/kmod.h> |
10a0a8d4 | 28 | #include <linux/reboot.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
1d17bf0c | 30 | #include <linux/smp_lock.h> |
6b8c90f2 DM |
31 | #include <linux/of.h> |
32 | #include <linux/of_device.h> | |
1da177e4 | 33 | |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include <asm/envctrl.h> | |
e1a39fbb | 36 | #include <asm/io.h> |
1da177e4 | 37 | |
6b8c90f2 DM |
38 | #define DRIVER_NAME "envctrl" |
39 | #define PFX DRIVER_NAME ": " | |
40 | ||
1da177e4 LT |
41 | #define ENVCTRL_MINOR 162 |
42 | ||
43 | #define PCF8584_ADDRESS 0x55 | |
44 | ||
45 | #define CONTROL_PIN 0x80 | |
46 | #define CONTROL_ES0 0x40 | |
47 | #define CONTROL_ES1 0x20 | |
48 | #define CONTROL_ES2 0x10 | |
49 | #define CONTROL_ENI 0x08 | |
50 | #define CONTROL_STA 0x04 | |
51 | #define CONTROL_STO 0x02 | |
52 | #define CONTROL_ACK 0x01 | |
53 | ||
54 | #define STATUS_PIN 0x80 | |
55 | #define STATUS_STS 0x20 | |
56 | #define STATUS_BER 0x10 | |
57 | #define STATUS_LRB 0x08 | |
58 | #define STATUS_AD0 0x08 | |
59 | #define STATUS_AAB 0x04 | |
60 | #define STATUS_LAB 0x02 | |
61 | #define STATUS_BB 0x01 | |
62 | ||
63 | /* | |
64 | * CLK Mode Register. | |
65 | */ | |
66 | #define BUS_CLK_90 0x00 | |
67 | #define BUS_CLK_45 0x01 | |
68 | #define BUS_CLK_11 0x02 | |
69 | #define BUS_CLK_1_5 0x03 | |
70 | ||
71 | #define CLK_3 0x00 | |
72 | #define CLK_4_43 0x10 | |
73 | #define CLK_6 0x14 | |
74 | #define CLK_8 0x18 | |
75 | #define CLK_12 0x1c | |
76 | ||
77 | #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ | |
78 | #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ | |
79 | ||
80 | /* Monitor type of i2c child device. | |
81 | * Firmware definitions. | |
82 | */ | |
83 | #define PCF8584_MAX_CHANNELS 8 | |
84 | #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ | |
85 | #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ | |
86 | #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ | |
87 | #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ | |
88 | ||
89 | /* Monitor type of i2c child device. | |
90 | * Driver definitions. | |
91 | */ | |
92 | #define ENVCTRL_NOMON 0 | |
93 | #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ | |
94 | #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ | |
95 | #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ | |
af901ca1 | 96 | #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperature */ |
1da177e4 LT |
97 | /* monitor */ |
98 | #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ | |
99 | #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ | |
af901ca1 | 100 | #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */ |
1da177e4 LT |
101 | #define ENVCTRL_GLOBALADDR_MON 8 /* global address */ |
102 | ||
103 | /* Child device type. | |
104 | * Driver definitions. | |
105 | */ | |
106 | #define I2C_ADC 0 /* pcf8591 */ | |
107 | #define I2C_GPIO 1 /* pcf8571 */ | |
108 | ||
109 | /* Data read from child device may need to decode | |
110 | * through a data table and a scale. | |
111 | * Translation type as defined by firmware. | |
112 | */ | |
113 | #define ENVCTRL_TRANSLATE_NO 0 | |
114 | #define ENVCTRL_TRANSLATE_PARTIAL 1 | |
115 | #define ENVCTRL_TRANSLATE_COMBINED 2 | |
116 | #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ | |
117 | #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ | |
118 | ||
119 | /* Driver miscellaneous definitions. */ | |
120 | #define ENVCTRL_MAX_CPU 4 | |
121 | #define CHANNEL_DESC_SZ 256 | |
122 | ||
123 | /* Mask values for combined GlobalAddress/PowerStatus node */ | |
124 | #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F | |
125 | #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 | |
126 | ||
127 | /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms | |
128 | * (see envctrl_init_i2c_child) | |
129 | */ | |
130 | #define ENVCTRL_CPCI_IGNORED_NODE 0x70 | |
131 | ||
132 | #define PCF8584_DATA 0x00 | |
133 | #define PCF8584_CSR 0x01 | |
134 | ||
135 | /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. | |
136 | * Property of a port or channel as defined by the firmware. | |
137 | */ | |
138 | struct pcf8584_channel { | |
139 | unsigned char chnl_no; | |
140 | unsigned char io_direction; | |
141 | unsigned char type; | |
142 | unsigned char last; | |
143 | }; | |
144 | ||
145 | /* Each child device may have one or more tables of bytes to help decode | |
146 | * data. Table property as defined by the firmware. | |
147 | */ | |
148 | struct pcf8584_tblprop { | |
149 | unsigned int type; | |
150 | unsigned int scale; | |
151 | unsigned int offset; /* offset from the beginning of the table */ | |
152 | unsigned int size; | |
153 | }; | |
154 | ||
155 | /* i2c child */ | |
156 | struct i2c_child_t { | |
157 | /* Either ADC or GPIO. */ | |
158 | unsigned char i2ctype; | |
159 | unsigned long addr; | |
160 | struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; | |
161 | ||
162 | /* Channel info. */ | |
163 | unsigned int total_chnls; /* Number of monitor channels. */ | |
164 | unsigned char fan_mask; /* Byte mask for fan status channels. */ | |
165 | unsigned char voltage_mask; /* Byte mask for voltage status channels. */ | |
166 | struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; | |
167 | ||
168 | /* Properties of all monitor channels. */ | |
169 | unsigned int total_tbls; /* Number of monitor tables. */ | |
170 | char *tables; /* Pointer to table(s). */ | |
171 | char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ | |
172 | char mon_type[PCF8584_MAX_CHANNELS]; | |
173 | }; | |
174 | ||
175 | static void __iomem *i2c; | |
176 | static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; | |
177 | static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; | |
178 | static unsigned int warning_temperature = 0; | |
179 | static unsigned int shutdown_temperature = 0; | |
180 | static char read_cpu; | |
181 | ||
182 | /* Forward declarations. */ | |
183 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); | |
184 | ||
185 | /* Function Description: Test the PIN bit (Pending Interrupt Not) | |
186 | * to test when serial transmission is completed . | |
187 | * Return : None. | |
188 | */ | |
189 | static void envtrl_i2c_test_pin(void) | |
190 | { | |
191 | int limit = 1000000; | |
192 | ||
193 | while (--limit > 0) { | |
194 | if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) | |
195 | break; | |
196 | udelay(1); | |
197 | } | |
198 | ||
199 | if (limit <= 0) | |
6b8c90f2 | 200 | printk(KERN_INFO PFX "Pin status will not clear.\n"); |
1da177e4 LT |
201 | } |
202 | ||
203 | /* Function Description: Test busy bit. | |
204 | * Return : None. | |
205 | */ | |
206 | static void envctrl_i2c_test_bb(void) | |
207 | { | |
208 | int limit = 1000000; | |
209 | ||
210 | while (--limit > 0) { | |
211 | /* Busy bit 0 means busy. */ | |
212 | if (readb(i2c + PCF8584_CSR) & STATUS_BB) | |
213 | break; | |
214 | udelay(1); | |
215 | } | |
216 | ||
217 | if (limit <= 0) | |
6b8c90f2 | 218 | printk(KERN_INFO PFX "Busy bit will not clear.\n"); |
1da177e4 LT |
219 | } |
220 | ||
221 | /* Function Description: Send the address for a read access. | |
222 | * Return : 0 if not acknowledged, otherwise acknowledged. | |
223 | */ | |
224 | static int envctrl_i2c_read_addr(unsigned char addr) | |
225 | { | |
226 | envctrl_i2c_test_bb(); | |
227 | ||
228 | /* Load address. */ | |
229 | writeb(addr + 1, i2c + PCF8584_DATA); | |
230 | ||
231 | envctrl_i2c_test_bb(); | |
232 | ||
233 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
234 | ||
235 | /* Wait for PIN. */ | |
236 | envtrl_i2c_test_pin(); | |
237 | ||
238 | /* CSR 0 means acknowledged. */ | |
239 | if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { | |
240 | return readb(i2c + PCF8584_DATA); | |
241 | } else { | |
242 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
243 | return 0; | |
244 | } | |
245 | } | |
246 | ||
247 | /* Function Description: Send the address for write mode. | |
248 | * Return : None. | |
249 | */ | |
250 | static void envctrl_i2c_write_addr(unsigned char addr) | |
251 | { | |
252 | envctrl_i2c_test_bb(); | |
253 | writeb(addr, i2c + PCF8584_DATA); | |
254 | ||
255 | /* Generate Start condition. */ | |
256 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
257 | } | |
258 | ||
259 | /* Function Description: Read 1 byte of data from addr | |
260 | * set by envctrl_i2c_read_addr() | |
261 | * Return : Data from address set by envctrl_i2c_read_addr(). | |
262 | */ | |
263 | static unsigned char envctrl_i2c_read_data(void) | |
264 | { | |
265 | envtrl_i2c_test_pin(); | |
266 | writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ | |
267 | return readb(i2c + PCF8584_DATA); | |
268 | } | |
269 | ||
270 | /* Function Description: Instruct the device which port to read data from. | |
271 | * Return : None. | |
272 | */ | |
273 | static void envctrl_i2c_write_data(unsigned char port) | |
274 | { | |
275 | envtrl_i2c_test_pin(); | |
276 | writeb(port, i2c + PCF8584_DATA); | |
277 | } | |
278 | ||
279 | /* Function Description: Generate Stop condition after last byte is sent. | |
280 | * Return : None. | |
281 | */ | |
282 | static void envctrl_i2c_stop(void) | |
283 | { | |
284 | envtrl_i2c_test_pin(); | |
285 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
286 | } | |
287 | ||
288 | /* Function Description: Read adc device. | |
289 | * Return : Data at address and port. | |
290 | */ | |
291 | static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) | |
292 | { | |
293 | /* Send address. */ | |
294 | envctrl_i2c_write_addr(addr); | |
295 | ||
296 | /* Setup port to read. */ | |
297 | envctrl_i2c_write_data(port); | |
298 | envctrl_i2c_stop(); | |
299 | ||
300 | /* Read port. */ | |
301 | envctrl_i2c_read_addr(addr); | |
302 | ||
303 | /* Do a single byte read and send stop. */ | |
304 | envctrl_i2c_read_data(); | |
305 | envctrl_i2c_stop(); | |
306 | ||
307 | return readb(i2c + PCF8584_DATA); | |
308 | } | |
309 | ||
310 | /* Function Description: Read gpio device. | |
311 | * Return : Data at address. | |
312 | */ | |
313 | static unsigned char envctrl_i2c_read_8574(unsigned char addr) | |
314 | { | |
315 | unsigned char rd; | |
316 | ||
317 | envctrl_i2c_read_addr(addr); | |
318 | ||
319 | /* Do a single byte read and send stop. */ | |
320 | rd = envctrl_i2c_read_data(); | |
321 | envctrl_i2c_stop(); | |
322 | return rd; | |
323 | } | |
324 | ||
325 | /* Function Description: Decode data read from an adc device using firmware | |
326 | * table. | |
327 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
328 | */ | |
329 | static int envctrl_i2c_data_translate(unsigned char data, int translate_type, | |
330 | int scale, char *tbl, char *bufdata) | |
331 | { | |
332 | int len = 0; | |
333 | ||
334 | switch (translate_type) { | |
335 | case ENVCTRL_TRANSLATE_NO: | |
336 | /* No decode necessary. */ | |
337 | len = 1; | |
338 | bufdata[0] = data; | |
339 | break; | |
340 | ||
341 | case ENVCTRL_TRANSLATE_FULL: | |
342 | /* Decode this way: data = table[data]. */ | |
343 | len = 1; | |
344 | bufdata[0] = tbl[data]; | |
345 | break; | |
346 | ||
347 | case ENVCTRL_TRANSLATE_SCALE: | |
348 | /* Decode this way: data = table[data]/scale */ | |
349 | sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); | |
350 | len = strlen(bufdata); | |
351 | bufdata[len - 1] = bufdata[len - 2]; | |
352 | bufdata[len - 2] = '.'; | |
353 | break; | |
354 | ||
355 | default: | |
356 | break; | |
357 | }; | |
358 | ||
359 | return len; | |
360 | } | |
361 | ||
362 | /* Function Description: Read cpu-related data such as cpu temperature, voltage. | |
363 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
364 | */ | |
365 | static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, | |
366 | char mon_type, unsigned char *bufdata) | |
367 | { | |
368 | unsigned char data; | |
369 | int i; | |
370 | char *tbl, j = -1; | |
371 | ||
372 | /* Find the right monitor type and channel. */ | |
373 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
374 | if (pchild->mon_type[i] == mon_type) { | |
375 | if (++j == cpu) { | |
376 | break; | |
377 | } | |
378 | } | |
379 | } | |
380 | ||
381 | if (j != cpu) | |
382 | return 0; | |
383 | ||
384 | /* Read data from address and port. */ | |
385 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
386 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
387 | ||
388 | /* Find decoding table. */ | |
389 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
390 | ||
391 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
392 | pchild->tblprop_array[i].scale, | |
393 | tbl, bufdata); | |
394 | } | |
395 | ||
396 | /* Function Description: Read noncpu-related data such as motherboard | |
397 | * temperature. | |
398 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
399 | */ | |
400 | static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, | |
401 | char mon_type, unsigned char *bufdata) | |
402 | { | |
403 | unsigned char data; | |
404 | int i; | |
405 | char *tbl = NULL; | |
406 | ||
407 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
408 | if (pchild->mon_type[i] == mon_type) | |
409 | break; | |
410 | } | |
411 | ||
412 | if (i >= PCF8584_MAX_CHANNELS) | |
413 | return 0; | |
414 | ||
415 | /* Read data from address and port. */ | |
416 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
417 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
418 | ||
419 | /* Find decoding table. */ | |
420 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
421 | ||
422 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
423 | pchild->tblprop_array[i].scale, | |
424 | tbl, bufdata); | |
425 | } | |
426 | ||
427 | /* Function Description: Read fan status. | |
428 | * Return : Always 1 byte. Status stored in bufdata. | |
429 | */ | |
430 | static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, | |
431 | unsigned char data, | |
432 | char *bufdata) | |
433 | { | |
434 | unsigned char tmp, ret = 0; | |
435 | int i, j = 0; | |
436 | ||
437 | tmp = data & pchild->fan_mask; | |
438 | ||
439 | if (tmp == pchild->fan_mask) { | |
440 | /* All bits are on. All fans are functioning. */ | |
441 | ret = ENVCTRL_ALL_FANS_GOOD; | |
442 | } else if (tmp == 0) { | |
443 | /* No bits are on. No fans are functioning. */ | |
444 | ret = ENVCTRL_ALL_FANS_BAD; | |
445 | } else { | |
446 | /* Go through all channels, mark 'on' the matched bits. | |
447 | * Notice that fan_mask may have discontiguous bits but | |
448 | * return mask are always contiguous. For example if we | |
449 | * monitor 4 fans at channels 0,1,2,4, the return mask | |
450 | * should be 00010000 if only fan at channel 4 is working. | |
451 | */ | |
452 | for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { | |
453 | if (pchild->fan_mask & chnls_mask[i]) { | |
454 | if (!(chnls_mask[i] & tmp)) | |
455 | ret |= chnls_mask[j]; | |
456 | ||
457 | j++; | |
458 | } | |
459 | } | |
460 | } | |
461 | ||
462 | bufdata[0] = ret; | |
463 | return 1; | |
464 | } | |
465 | ||
466 | /* Function Description: Read global addressing line. | |
467 | * Return : Always 1 byte. Status stored in bufdata. | |
468 | */ | |
469 | static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, | |
470 | unsigned char data, | |
471 | char *bufdata) | |
472 | { | |
473 | /* Translatation table is not necessary, as global | |
474 | * addr is the integer value of the GA# bits. | |
475 | * | |
476 | * NOTE: MSB is documented as zero, but I see it as '1' always.... | |
477 | * | |
478 | * ----------------------------------------------- | |
479 | * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | | |
480 | * ----------------------------------------------- | |
481 | * GA0 - GA4 integer value of Global Address (backplane slot#) | |
482 | * DEG 0 = cPCI Power supply output is starting to degrade | |
483 | * 1 = cPCI Power supply output is OK | |
484 | * FAL 0 = cPCI Power supply has failed | |
485 | * 1 = cPCI Power supply output is OK | |
486 | */ | |
487 | bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); | |
488 | return 1; | |
489 | } | |
490 | ||
491 | /* Function Description: Read standard voltage and power supply status. | |
492 | * Return : Always 1 byte. Status stored in bufdata. | |
493 | */ | |
494 | static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, | |
495 | unsigned char data, | |
496 | char *bufdata) | |
497 | { | |
498 | unsigned char tmp, ret = 0; | |
499 | int i, j = 0; | |
500 | ||
501 | tmp = data & pchild->voltage_mask; | |
502 | ||
503 | /* Two channels are used to monitor voltage and power supply. */ | |
504 | if (tmp == pchild->voltage_mask) { | |
505 | /* All bits are on. Voltage and power supply are okay. */ | |
506 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; | |
507 | } else if (tmp == 0) { | |
508 | /* All bits are off. Voltage and power supply are bad */ | |
509 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD; | |
510 | } else { | |
511 | /* Either voltage or power supply has problem. */ | |
512 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
513 | if (pchild->voltage_mask & chnls_mask[i]) { | |
514 | j++; | |
515 | ||
516 | /* Break out when there is a mismatch. */ | |
517 | if (!(chnls_mask[i] & tmp)) | |
518 | break; | |
519 | } | |
520 | } | |
521 | ||
522 | /* Make a wish that hardware will always use the | |
523 | * first channel for voltage and the second for | |
524 | * power supply. | |
525 | */ | |
526 | if (j == 1) | |
527 | ret = ENVCTRL_VOLTAGE_BAD; | |
528 | else | |
529 | ret = ENVCTRL_POWERSUPPLY_BAD; | |
530 | } | |
531 | ||
532 | bufdata[0] = ret; | |
533 | return 1; | |
534 | } | |
535 | ||
536 | /* Function Description: Read a byte from /dev/envctrl. Mapped to user read(). | |
537 | * Return: Number of read bytes. 0 for error. | |
538 | */ | |
539 | static ssize_t | |
540 | envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
541 | { | |
542 | struct i2c_child_t *pchild; | |
543 | unsigned char data[10]; | |
544 | int ret = 0; | |
545 | ||
546 | /* Get the type of read as decided in ioctl() call. | |
547 | * Find the appropriate i2c child. | |
548 | * Get the data and put back to the user buffer. | |
549 | */ | |
550 | ||
551 | switch ((int)(long)file->private_data) { | |
552 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
553 | if (warning_temperature == 0) | |
554 | return 0; | |
555 | ||
556 | data[0] = (unsigned char)(warning_temperature); | |
557 | ret = 1; | |
558 | if (copy_to_user(buf, data, ret)) | |
559 | ret = -EFAULT; | |
560 | break; | |
561 | ||
562 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
563 | if (shutdown_temperature == 0) | |
564 | return 0; | |
565 | ||
566 | data[0] = (unsigned char)(shutdown_temperature); | |
567 | ret = 1; | |
568 | if (copy_to_user(buf, data, ret)) | |
569 | ret = -EFAULT; | |
570 | break; | |
571 | ||
572 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
573 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON))) | |
574 | return 0; | |
575 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data); | |
576 | if (copy_to_user(buf, data, ret)) | |
577 | ret = -EFAULT; | |
578 | break; | |
579 | ||
580 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
581 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) | |
582 | return 0; | |
583 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data); | |
584 | ||
585 | /* Reset cpu to the default cpu0. */ | |
586 | if (copy_to_user(buf, data, ret)) | |
587 | ret = -EFAULT; | |
588 | break; | |
589 | ||
590 | case ENVCTRL_RD_CPU_VOLTAGE: | |
591 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON))) | |
592 | return 0; | |
593 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data); | |
594 | ||
595 | /* Reset cpu to the default cpu0. */ | |
596 | if (copy_to_user(buf, data, ret)) | |
597 | ret = -EFAULT; | |
598 | break; | |
599 | ||
600 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
601 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON))) | |
602 | return 0; | |
603 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data); | |
604 | if (copy_to_user(buf, data, ret)) | |
605 | ret = -EFAULT; | |
606 | break; | |
607 | ||
608 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
609 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON))) | |
610 | return 0; | |
611 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data); | |
612 | if (copy_to_user(buf, data, ret)) | |
613 | ret = -EFAULT; | |
614 | break; | |
615 | ||
616 | case ENVCTRL_RD_FAN_STATUS: | |
617 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON))) | |
618 | return 0; | |
619 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
620 | ret = envctrl_i2c_fan_status(pchild,data[0], data); | |
621 | if (copy_to_user(buf, data, ret)) | |
622 | ret = -EFAULT; | |
623 | break; | |
624 | ||
625 | case ENVCTRL_RD_GLOBALADDRESS: | |
626 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
627 | return 0; | |
628 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
629 | ret = envctrl_i2c_globaladdr(pchild, data[0], data); | |
630 | if (copy_to_user(buf, data, ret)) | |
631 | ret = -EFAULT; | |
632 | break; | |
633 | ||
634 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
635 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON))) | |
636 | /* If voltage monitor not present, check for CPCI equivalent */ | |
637 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
638 | return 0; | |
639 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
640 | ret = envctrl_i2c_voltage_status(pchild, data[0], data); | |
641 | if (copy_to_user(buf, data, ret)) | |
642 | ret = -EFAULT; | |
643 | break; | |
644 | ||
645 | default: | |
646 | break; | |
647 | ||
648 | }; | |
649 | ||
650 | return ret; | |
651 | } | |
652 | ||
653 | /* Function Description: Command what to read. Mapped to user ioctl(). | |
654 | * Return: Gives 0 for implemented commands, -EINVAL otherwise. | |
655 | */ | |
1928f8e5 CH |
656 | static long |
657 | envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
658 | { |
659 | char __user *infobuf; | |
660 | ||
661 | switch (cmd) { | |
662 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
663 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
664 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
665 | case ENVCTRL_RD_FAN_STATUS: | |
666 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
667 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
668 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
669 | case ENVCTRL_RD_GLOBALADDRESS: | |
670 | file->private_data = (void *)(long)cmd; | |
671 | break; | |
672 | ||
673 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
674 | case ENVCTRL_RD_CPU_VOLTAGE: | |
675 | /* Check to see if application passes in any cpu number, | |
676 | * the default is cpu0. | |
677 | */ | |
678 | infobuf = (char __user *) arg; | |
679 | if (infobuf == NULL) { | |
680 | read_cpu = 0; | |
681 | }else { | |
682 | get_user(read_cpu, infobuf); | |
683 | } | |
684 | ||
685 | /* Save the command for use when reading. */ | |
686 | file->private_data = (void *)(long)cmd; | |
687 | break; | |
688 | ||
689 | default: | |
690 | return -EINVAL; | |
691 | }; | |
692 | ||
693 | return 0; | |
694 | } | |
695 | ||
696 | /* Function Description: open device. Mapped to user open(). | |
697 | * Return: Always 0. | |
698 | */ | |
699 | static int | |
700 | envctrl_open(struct inode *inode, struct file *file) | |
701 | { | |
1d17bf0c | 702 | cycle_kernel_lock(); |
1da177e4 LT |
703 | file->private_data = NULL; |
704 | return 0; | |
705 | } | |
706 | ||
707 | /* Function Description: Open device. Mapped to user close(). | |
708 | * Return: Always 0. | |
709 | */ | |
710 | static int | |
711 | envctrl_release(struct inode *inode, struct file *file) | |
712 | { | |
713 | return 0; | |
714 | } | |
715 | ||
00977a59 | 716 | static const struct file_operations envctrl_fops = { |
1928f8e5 CH |
717 | .owner = THIS_MODULE, |
718 | .read = envctrl_read, | |
719 | .unlocked_ioctl = envctrl_ioctl, | |
720 | #ifdef CONFIG_COMPAT | |
721 | .compat_ioctl = envctrl_ioctl, | |
722 | #endif | |
723 | .open = envctrl_open, | |
724 | .release = envctrl_release, | |
1da177e4 LT |
725 | }; |
726 | ||
727 | static struct miscdevice envctrl_dev = { | |
728 | ENVCTRL_MINOR, | |
729 | "envctrl", | |
730 | &envctrl_fops | |
731 | }; | |
732 | ||
733 | /* Function Description: Set monitor type based on firmware description. | |
734 | * Return: None. | |
735 | */ | |
736 | static void envctrl_set_mon(struct i2c_child_t *pchild, | |
ccf0dec6 | 737 | const char *chnl_desc, |
1da177e4 LT |
738 | int chnl_no) |
739 | { | |
740 | /* Firmware only has temperature type. It does not distinguish | |
741 | * different kinds of temperatures. We use channel description | |
742 | * to disinguish them. | |
743 | */ | |
744 | if (!(strcmp(chnl_desc,"temp,cpu")) || | |
745 | !(strcmp(chnl_desc,"temp,cpu0")) || | |
746 | !(strcmp(chnl_desc,"temp,cpu1")) || | |
747 | !(strcmp(chnl_desc,"temp,cpu2")) || | |
748 | !(strcmp(chnl_desc,"temp,cpu3"))) | |
749 | pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON; | |
750 | ||
751 | if (!(strcmp(chnl_desc,"vddcore,cpu0")) || | |
752 | !(strcmp(chnl_desc,"vddcore,cpu1")) || | |
753 | !(strcmp(chnl_desc,"vddcore,cpu2")) || | |
754 | !(strcmp(chnl_desc,"vddcore,cpu3"))) | |
755 | pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON; | |
756 | ||
757 | if (!(strcmp(chnl_desc,"temp,motherboard"))) | |
758 | pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON; | |
759 | ||
760 | if (!(strcmp(chnl_desc,"temp,scsi"))) | |
761 | pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON; | |
762 | ||
763 | if (!(strcmp(chnl_desc,"temp,ethernet"))) | |
764 | pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON; | |
765 | } | |
766 | ||
767 | /* Function Description: Initialize monitor channel with channel desc, | |
768 | * decoding tables, monitor type, optional properties. | |
769 | * Return: None. | |
770 | */ | |
690c8fd3 | 771 | static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp) |
1da177e4 | 772 | { |
1da177e4 | 773 | int i = 0, len; |
ccf0dec6 SR |
774 | const char *pos; |
775 | const unsigned int *pval; | |
1da177e4 LT |
776 | |
777 | /* Firmware describe channels into a stream separated by a '\0'. */ | |
690c8fd3 | 778 | pos = of_get_property(dp, "channels-description", &len); |
1da177e4 LT |
779 | |
780 | while (len > 0) { | |
781 | int l = strlen(pos) + 1; | |
782 | envctrl_set_mon(pchild, pos, i++); | |
783 | len -= l; | |
784 | pos += l; | |
785 | } | |
786 | ||
787 | /* Get optional properties. */ | |
690c8fd3 DM |
788 | pval = of_get_property(dp, "warning-temp", NULL); |
789 | if (pval) | |
790 | warning_temperature = *pval; | |
791 | ||
792 | pval = of_get_property(dp, "shutdown-temp", NULL); | |
793 | if (pval) | |
794 | shutdown_temperature = *pval; | |
1da177e4 LT |
795 | } |
796 | ||
797 | /* Function Description: Initialize child device monitoring fan status. | |
798 | * Return: None. | |
799 | */ | |
800 | static void envctrl_init_fanstat(struct i2c_child_t *pchild) | |
801 | { | |
802 | int i; | |
803 | ||
804 | /* Go through all channels and set up the mask. */ | |
805 | for (i = 0; i < pchild->total_chnls; i++) | |
806 | pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
807 | ||
808 | /* We only need to know if this child has fan status monitored. | |
809 | * We don't care which channels since we have the mask already. | |
810 | */ | |
811 | pchild->mon_type[0] = ENVCTRL_FANSTAT_MON; | |
812 | } | |
813 | ||
814 | /* Function Description: Initialize child device for global addressing line. | |
815 | * Return: None. | |
816 | */ | |
817 | static void envctrl_init_globaladdr(struct i2c_child_t *pchild) | |
818 | { | |
819 | int i; | |
820 | ||
821 | /* Voltage/PowerSupply monitoring is piggybacked | |
822 | * with Global Address on CompactPCI. See comments | |
823 | * within envctrl_i2c_globaladdr for bit assignments. | |
824 | * | |
825 | * The mask is created here by assigning mask bits to each | |
826 | * bit position that represents PCF8584_VOLTAGE_TYPE data. | |
827 | * Channel numbers are not consecutive within the globaladdr | |
828 | * node (why?), so we use the actual counter value as chnls_mask | |
829 | * index instead of the chnl_array[x].chnl_no value. | |
830 | * | |
831 | * NOTE: This loop could be replaced with a constant representing | |
832 | * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK). | |
833 | */ | |
834 | for (i = 0; i < pchild->total_chnls; i++) { | |
835 | if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) { | |
836 | pchild->voltage_mask |= chnls_mask[i]; | |
837 | } | |
838 | } | |
839 | ||
840 | /* We only need to know if this child has global addressing | |
841 | * line monitored. We don't care which channels since we know | |
842 | * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK). | |
843 | */ | |
844 | pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON; | |
845 | } | |
846 | ||
847 | /* Initialize child device monitoring voltage status. */ | |
848 | static void envctrl_init_voltage_status(struct i2c_child_t *pchild) | |
849 | { | |
850 | int i; | |
851 | ||
852 | /* Go through all channels and set up the mask. */ | |
853 | for (i = 0; i < pchild->total_chnls; i++) | |
854 | pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
855 | ||
856 | /* We only need to know if this child has voltage status monitored. | |
857 | * We don't care which channels since we have the mask already. | |
858 | */ | |
859 | pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON; | |
860 | } | |
861 | ||
862 | /* Function Description: Initialize i2c child device. | |
863 | * Return: None. | |
864 | */ | |
6b8c90f2 | 865 | static void envctrl_init_i2c_child(struct device_node *dp, |
1da177e4 LT |
866 | struct i2c_child_t *pchild) |
867 | { | |
690c8fd3 | 868 | int len, i, tbls_size = 0; |
ccf0dec6 | 869 | const void *pval; |
1da177e4 LT |
870 | |
871 | /* Get device address. */ | |
690c8fd3 DM |
872 | pval = of_get_property(dp, "reg", &len); |
873 | memcpy(&pchild->addr, pval, len); | |
1da177e4 LT |
874 | |
875 | /* Get tables property. Read firmware temperature tables. */ | |
690c8fd3 DM |
876 | pval = of_get_property(dp, "translation", &len); |
877 | if (pval && len > 0) { | |
878 | memcpy(pchild->tblprop_array, pval, len); | |
1da177e4 LT |
879 | pchild->total_tbls = len / sizeof(struct pcf8584_tblprop); |
880 | for (i = 0; i < pchild->total_tbls; i++) { | |
881 | if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) { | |
882 | tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset; | |
883 | } | |
884 | } | |
885 | ||
886 | pchild->tables = kmalloc(tbls_size, GFP_KERNEL); | |
887 | if (pchild->tables == NULL){ | |
6b8c90f2 | 888 | printk(KERN_ERR PFX "Failed to allocate table.\n"); |
1da177e4 LT |
889 | return; |
890 | } | |
690c8fd3 DM |
891 | pval = of_get_property(dp, "tables", &len); |
892 | if (!pval || len <= 0) { | |
6b8c90f2 | 893 | printk(KERN_ERR PFX "Failed to get table.\n"); |
1da177e4 LT |
894 | return; |
895 | } | |
690c8fd3 | 896 | memcpy(pchild->tables, pval, len); |
1da177e4 LT |
897 | } |
898 | ||
899 | /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04) | |
900 | * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is | |
901 | * "For Factory Use Only." | |
902 | * | |
903 | * We ignore the node on these platforms by assigning the | |
904 | * 'NULL' monitor type. | |
905 | */ | |
906 | if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) { | |
690c8fd3 | 907 | struct device_node *root_node; |
1da177e4 | 908 | int len; |
1da177e4 | 909 | |
690c8fd3 DM |
910 | root_node = of_find_node_by_path("/"); |
911 | if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) { | |
1da177e4 LT |
912 | for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { |
913 | pchild->mon_type[len] = ENVCTRL_NOMON; | |
914 | } | |
915 | return; | |
916 | } | |
917 | } | |
918 | ||
919 | /* Get the monitor channels. */ | |
690c8fd3 DM |
920 | pval = of_get_property(dp, "channels-in-use", &len); |
921 | memcpy(pchild->chnl_array, pval, len); | |
1da177e4 LT |
922 | pchild->total_chnls = len / sizeof(struct pcf8584_channel); |
923 | ||
924 | for (i = 0; i < pchild->total_chnls; i++) { | |
925 | switch (pchild->chnl_array[i].type) { | |
926 | case PCF8584_TEMP_TYPE: | |
690c8fd3 | 927 | envctrl_init_adc(pchild, dp); |
1da177e4 LT |
928 | break; |
929 | ||
930 | case PCF8584_GLOBALADDR_TYPE: | |
931 | envctrl_init_globaladdr(pchild); | |
932 | i = pchild->total_chnls; | |
933 | break; | |
934 | ||
935 | case PCF8584_FANSTAT_TYPE: | |
936 | envctrl_init_fanstat(pchild); | |
937 | i = pchild->total_chnls; | |
938 | break; | |
939 | ||
940 | case PCF8584_VOLTAGE_TYPE: | |
941 | if (pchild->i2ctype == I2C_ADC) { | |
690c8fd3 | 942 | envctrl_init_adc(pchild,dp); |
1da177e4 LT |
943 | } else { |
944 | envctrl_init_voltage_status(pchild); | |
945 | } | |
946 | i = pchild->total_chnls; | |
947 | break; | |
948 | ||
949 | default: | |
950 | break; | |
951 | }; | |
952 | } | |
953 | } | |
954 | ||
955 | /* Function Description: Search the child device list for a device. | |
956 | * Return : The i2c child if found. NULL otherwise. | |
957 | */ | |
958 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) | |
959 | { | |
960 | int i, j; | |
961 | ||
962 | for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) { | |
963 | for (j = 0; j < PCF8584_MAX_CHANNELS; j++) { | |
964 | if (i2c_childlist[i].mon_type[j] == mon_type) { | |
965 | return (struct i2c_child_t *)(&(i2c_childlist[i])); | |
966 | } | |
967 | } | |
968 | } | |
969 | return NULL; | |
970 | } | |
971 | ||
972 | static void envctrl_do_shutdown(void) | |
973 | { | |
974 | static int inprog = 0; | |
3db03b4a | 975 | int ret; |
1da177e4 LT |
976 | |
977 | if (inprog != 0) | |
978 | return; | |
979 | ||
980 | inprog = 1; | |
981 | printk(KERN_CRIT "kenvctrld: WARNING: Shutting down the system now.\n"); | |
10a0a8d4 | 982 | ret = orderly_poweroff(true); |
3db03b4a | 983 | if (ret < 0) { |
1da177e4 LT |
984 | printk(KERN_CRIT "kenvctrld: WARNING: system shutdown failed!\n"); |
985 | inprog = 0; /* unlikely to succeed, but we could try again */ | |
986 | } | |
987 | } | |
988 | ||
989 | static struct task_struct *kenvctrld_task; | |
990 | ||
991 | static int kenvctrld(void *__unused) | |
992 | { | |
993 | int poll_interval; | |
994 | int whichcpu; | |
995 | char tempbuf[10]; | |
996 | struct i2c_child_t *cputemp; | |
997 | ||
998 | if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) { | |
6b8c90f2 DM |
999 | printk(KERN_ERR PFX |
1000 | "kenvctrld unable to monitor CPU temp-- exiting\n"); | |
1da177e4 LT |
1001 | return -ENODEV; |
1002 | } | |
1003 | ||
cb39d263 | 1004 | poll_interval = 5000; /* TODO env_mon_interval */ |
1da177e4 | 1005 | |
6b8c90f2 | 1006 | printk(KERN_INFO PFX "%s starting...\n", current->comm); |
1da177e4 | 1007 | for (;;) { |
218b29e0 | 1008 | msleep_interruptible(poll_interval); |
1da177e4 | 1009 | |
218b29e0 CH |
1010 | if (kthread_should_stop()) |
1011 | break; | |
1012 | ||
1da177e4 LT |
1013 | for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) { |
1014 | if (0 < envctrl_read_cpu_info(whichcpu, cputemp, | |
1015 | ENVCTRL_CPUTEMP_MON, | |
1016 | tempbuf)) { | |
1017 | if (tempbuf[0] >= shutdown_temperature) { | |
1018 | printk(KERN_CRIT | |
1019 | "%s: WARNING: CPU%i temperature %i C meets or exceeds "\ | |
1020 | "shutdown threshold %i C\n", | |
1021 | current->comm, whichcpu, | |
1022 | tempbuf[0], shutdown_temperature); | |
1023 | envctrl_do_shutdown(); | |
1024 | } | |
1025 | } | |
1026 | } | |
1027 | } | |
6b8c90f2 | 1028 | printk(KERN_INFO PFX "%s exiting...\n", current->comm); |
1da177e4 LT |
1029 | return 0; |
1030 | } | |
1031 | ||
6b8c90f2 DM |
1032 | static int __devinit envctrl_probe(struct of_device *op, |
1033 | const struct of_device_id *match) | |
1da177e4 | 1034 | { |
6b8c90f2 DM |
1035 | struct device_node *dp; |
1036 | int index, err; | |
1da177e4 | 1037 | |
6b8c90f2 DM |
1038 | if (i2c) |
1039 | return -EINVAL; | |
1040 | ||
1041 | i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME); | |
1042 | if (!i2c) | |
1043 | return -ENOMEM; | |
1044 | ||
1045 | index = 0; | |
1046 | dp = op->node->child; | |
1047 | while (dp) { | |
1048 | if (!strcmp(dp->name, "gpio")) { | |
1049 | i2c_childlist[index].i2ctype = I2C_GPIO; | |
1050 | envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); | |
1051 | } else if (!strcmp(dp->name, "adc")) { | |
1052 | i2c_childlist[index].i2ctype = I2C_ADC; | |
1053 | envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); | |
1da177e4 | 1054 | } |
1da177e4 | 1055 | |
6b8c90f2 | 1056 | dp = dp->sibling; |
1da177e4 LT |
1057 | } |
1058 | ||
1059 | /* Set device address. */ | |
1060 | writeb(CONTROL_PIN, i2c + PCF8584_CSR); | |
1061 | writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); | |
1062 | ||
1063 | /* Set system clock and SCL frequencies. */ | |
1064 | writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); | |
1065 | writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); | |
1066 | ||
1067 | /* Enable serial interface. */ | |
1068 | writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); | |
1069 | udelay(200); | |
1070 | ||
1071 | /* Register the device as a minor miscellaneous device. */ | |
1072 | err = misc_register(&envctrl_dev); | |
1073 | if (err) { | |
6b8c90f2 | 1074 | printk(KERN_ERR PFX "Unable to get misc minor %d\n", |
1da177e4 LT |
1075 | envctrl_dev.minor); |
1076 | goto out_iounmap; | |
1077 | } | |
1078 | ||
1079 | /* Note above traversal routine post-incremented 'i' to accommodate | |
1080 | * a next child device, so we decrement before reverse-traversal of | |
1081 | * child devices. | |
1082 | */ | |
6b8c90f2 DM |
1083 | printk(KERN_INFO PFX "Initialized "); |
1084 | for (--index; index >= 0; --index) { | |
1da177e4 | 1085 | printk("[%s 0x%lx]%s", |
6b8c90f2 DM |
1086 | (I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" : |
1087 | ((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"), | |
1088 | i2c_childlist[index].addr, (0 == index) ? "\n" : " "); | |
1da177e4 LT |
1089 | } |
1090 | ||
218b29e0 CH |
1091 | kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); |
1092 | if (IS_ERR(kenvctrld_task)) { | |
38c1844b | 1093 | err = PTR_ERR(kenvctrld_task); |
1da177e4 | 1094 | goto out_deregister; |
218b29e0 | 1095 | } |
1da177e4 LT |
1096 | |
1097 | return 0; | |
1098 | ||
1099 | out_deregister: | |
1100 | misc_deregister(&envctrl_dev); | |
1101 | out_iounmap: | |
6b8c90f2 DM |
1102 | of_iounmap(&op->resource[0], i2c, 0x2); |
1103 | for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) | |
1104 | kfree(i2c_childlist[index].tables); | |
6044ec88 | 1105 | |
1da177e4 | 1106 | return err; |
1da177e4 LT |
1107 | } |
1108 | ||
6b8c90f2 | 1109 | static int __devexit envctrl_remove(struct of_device *op) |
1da177e4 | 1110 | { |
6b8c90f2 | 1111 | int index; |
1da177e4 | 1112 | |
218b29e0 | 1113 | kthread_stop(kenvctrld_task); |
1da177e4 | 1114 | |
6b8c90f2 | 1115 | of_iounmap(&op->resource[0], i2c, 0x2); |
1da177e4 LT |
1116 | misc_deregister(&envctrl_dev); |
1117 | ||
6b8c90f2 DM |
1118 | for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
1119 | kfree(i2c_childlist[index].tables); | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
fd098316 | 1124 | static const struct of_device_id envctrl_match[] = { |
6b8c90f2 DM |
1125 | { |
1126 | .name = "i2c", | |
1127 | .compatible = "i2cpcf,8584", | |
1128 | }, | |
1129 | {}, | |
1130 | }; | |
1131 | MODULE_DEVICE_TABLE(of, envctrl_match); | |
1132 | ||
1133 | static struct of_platform_driver envctrl_driver = { | |
1134 | .name = DRIVER_NAME, | |
1135 | .match_table = envctrl_match, | |
1136 | .probe = envctrl_probe, | |
1137 | .remove = __devexit_p(envctrl_remove), | |
1138 | }; | |
1139 | ||
1140 | static int __init envctrl_init(void) | |
1141 | { | |
1142 | return of_register_driver(&envctrl_driver, &of_bus_type); | |
1143 | } | |
1144 | ||
1145 | static void __exit envctrl_exit(void) | |
1146 | { | |
1147 | of_unregister_driver(&envctrl_driver); | |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | module_init(envctrl_init); | |
6b8c90f2 | 1151 | module_exit(envctrl_exit); |
1da177e4 | 1152 | MODULE_LICENSE("GPL"); |