Commit | Line | Data |
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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> |
218b29e0 | 22 | #include <linux/kthread.h> |
1da177e4 LT |
23 | #include <linux/delay.h> |
24 | #include <linux/ioport.h> | |
1da177e4 | 25 | #include <linux/miscdevice.h> |
872ec648 | 26 | #include <linux/kmod.h> |
10a0a8d4 | 27 | #include <linux/reboot.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
6b8c90f2 DM |
29 | #include <linux/of.h> |
30 | #include <linux/of_device.h> | |
1da177e4 | 31 | |
1da177e4 LT |
32 | #include <asm/uaccess.h> |
33 | #include <asm/envctrl.h> | |
e1a39fbb | 34 | #include <asm/io.h> |
1da177e4 | 35 | |
6b8c90f2 DM |
36 | #define DRIVER_NAME "envctrl" |
37 | #define PFX DRIVER_NAME ": " | |
38 | ||
1da177e4 LT |
39 | #define ENVCTRL_MINOR 162 |
40 | ||
41 | #define PCF8584_ADDRESS 0x55 | |
42 | ||
43 | #define CONTROL_PIN 0x80 | |
44 | #define CONTROL_ES0 0x40 | |
45 | #define CONTROL_ES1 0x20 | |
46 | #define CONTROL_ES2 0x10 | |
47 | #define CONTROL_ENI 0x08 | |
48 | #define CONTROL_STA 0x04 | |
49 | #define CONTROL_STO 0x02 | |
50 | #define CONTROL_ACK 0x01 | |
51 | ||
52 | #define STATUS_PIN 0x80 | |
53 | #define STATUS_STS 0x20 | |
54 | #define STATUS_BER 0x10 | |
55 | #define STATUS_LRB 0x08 | |
56 | #define STATUS_AD0 0x08 | |
57 | #define STATUS_AAB 0x04 | |
58 | #define STATUS_LAB 0x02 | |
59 | #define STATUS_BB 0x01 | |
60 | ||
61 | /* | |
62 | * CLK Mode Register. | |
63 | */ | |
64 | #define BUS_CLK_90 0x00 | |
65 | #define BUS_CLK_45 0x01 | |
66 | #define BUS_CLK_11 0x02 | |
67 | #define BUS_CLK_1_5 0x03 | |
68 | ||
69 | #define CLK_3 0x00 | |
70 | #define CLK_4_43 0x10 | |
71 | #define CLK_6 0x14 | |
72 | #define CLK_8 0x18 | |
73 | #define CLK_12 0x1c | |
74 | ||
75 | #define OBD_SEND_START 0xc5 /* value to generate I2c_bus START condition */ | |
76 | #define OBD_SEND_STOP 0xc3 /* value to generate I2c_bus STOP condition */ | |
77 | ||
78 | /* Monitor type of i2c child device. | |
79 | * Firmware definitions. | |
80 | */ | |
81 | #define PCF8584_MAX_CHANNELS 8 | |
82 | #define PCF8584_GLOBALADDR_TYPE 6 /* global address monitor */ | |
83 | #define PCF8584_FANSTAT_TYPE 3 /* fan status monitor */ | |
84 | #define PCF8584_VOLTAGE_TYPE 2 /* voltage monitor */ | |
85 | #define PCF8584_TEMP_TYPE 1 /* temperature monitor*/ | |
86 | ||
87 | /* Monitor type of i2c child device. | |
88 | * Driver definitions. | |
89 | */ | |
90 | #define ENVCTRL_NOMON 0 | |
91 | #define ENVCTRL_CPUTEMP_MON 1 /* cpu temperature monitor */ | |
92 | #define ENVCTRL_CPUVOLTAGE_MON 2 /* voltage monitor */ | |
93 | #define ENVCTRL_FANSTAT_MON 3 /* fan status monitor */ | |
af901ca1 | 94 | #define ENVCTRL_ETHERTEMP_MON 4 /* ethernet temperature */ |
1da177e4 LT |
95 | /* monitor */ |
96 | #define ENVCTRL_VOLTAGESTAT_MON 5 /* voltage status monitor */ | |
97 | #define ENVCTRL_MTHRBDTEMP_MON 6 /* motherboard temperature */ | |
af901ca1 | 98 | #define ENVCTRL_SCSITEMP_MON 7 /* scsi temperature */ |
1da177e4 LT |
99 | #define ENVCTRL_GLOBALADDR_MON 8 /* global address */ |
100 | ||
101 | /* Child device type. | |
102 | * Driver definitions. | |
103 | */ | |
104 | #define I2C_ADC 0 /* pcf8591 */ | |
105 | #define I2C_GPIO 1 /* pcf8571 */ | |
106 | ||
107 | /* Data read from child device may need to decode | |
108 | * through a data table and a scale. | |
109 | * Translation type as defined by firmware. | |
110 | */ | |
111 | #define ENVCTRL_TRANSLATE_NO 0 | |
112 | #define ENVCTRL_TRANSLATE_PARTIAL 1 | |
113 | #define ENVCTRL_TRANSLATE_COMBINED 2 | |
114 | #define ENVCTRL_TRANSLATE_FULL 3 /* table[data] */ | |
115 | #define ENVCTRL_TRANSLATE_SCALE 4 /* table[data]/scale */ | |
116 | ||
117 | /* Driver miscellaneous definitions. */ | |
118 | #define ENVCTRL_MAX_CPU 4 | |
119 | #define CHANNEL_DESC_SZ 256 | |
120 | ||
121 | /* Mask values for combined GlobalAddress/PowerStatus node */ | |
122 | #define ENVCTRL_GLOBALADDR_ADDR_MASK 0x1F | |
123 | #define ENVCTRL_GLOBALADDR_PSTAT_MASK 0x60 | |
124 | ||
125 | /* Node 0x70 ignored on CompactPCI CP1400/1500 platforms | |
126 | * (see envctrl_init_i2c_child) | |
127 | */ | |
128 | #define ENVCTRL_CPCI_IGNORED_NODE 0x70 | |
129 | ||
130 | #define PCF8584_DATA 0x00 | |
131 | #define PCF8584_CSR 0x01 | |
132 | ||
133 | /* Each child device can be monitored by up to PCF8584_MAX_CHANNELS. | |
134 | * Property of a port or channel as defined by the firmware. | |
135 | */ | |
136 | struct pcf8584_channel { | |
137 | unsigned char chnl_no; | |
138 | unsigned char io_direction; | |
139 | unsigned char type; | |
140 | unsigned char last; | |
141 | }; | |
142 | ||
143 | /* Each child device may have one or more tables of bytes to help decode | |
144 | * data. Table property as defined by the firmware. | |
145 | */ | |
146 | struct pcf8584_tblprop { | |
147 | unsigned int type; | |
148 | unsigned int scale; | |
149 | unsigned int offset; /* offset from the beginning of the table */ | |
150 | unsigned int size; | |
151 | }; | |
152 | ||
153 | /* i2c child */ | |
154 | struct i2c_child_t { | |
155 | /* Either ADC or GPIO. */ | |
156 | unsigned char i2ctype; | |
157 | unsigned long addr; | |
158 | struct pcf8584_channel chnl_array[PCF8584_MAX_CHANNELS]; | |
159 | ||
160 | /* Channel info. */ | |
161 | unsigned int total_chnls; /* Number of monitor channels. */ | |
162 | unsigned char fan_mask; /* Byte mask for fan status channels. */ | |
163 | unsigned char voltage_mask; /* Byte mask for voltage status channels. */ | |
164 | struct pcf8584_tblprop tblprop_array[PCF8584_MAX_CHANNELS]; | |
165 | ||
166 | /* Properties of all monitor channels. */ | |
167 | unsigned int total_tbls; /* Number of monitor tables. */ | |
168 | char *tables; /* Pointer to table(s). */ | |
169 | char chnls_desc[CHANNEL_DESC_SZ]; /* Channel description. */ | |
170 | char mon_type[PCF8584_MAX_CHANNELS]; | |
171 | }; | |
172 | ||
173 | static void __iomem *i2c; | |
174 | static struct i2c_child_t i2c_childlist[ENVCTRL_MAX_CPU*2]; | |
175 | static unsigned char chnls_mask[] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80 }; | |
176 | static unsigned int warning_temperature = 0; | |
177 | static unsigned int shutdown_temperature = 0; | |
178 | static char read_cpu; | |
179 | ||
180 | /* Forward declarations. */ | |
181 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char); | |
182 | ||
183 | /* Function Description: Test the PIN bit (Pending Interrupt Not) | |
184 | * to test when serial transmission is completed . | |
185 | * Return : None. | |
186 | */ | |
187 | static void envtrl_i2c_test_pin(void) | |
188 | { | |
189 | int limit = 1000000; | |
190 | ||
191 | while (--limit > 0) { | |
192 | if (!(readb(i2c + PCF8584_CSR) & STATUS_PIN)) | |
193 | break; | |
194 | udelay(1); | |
195 | } | |
196 | ||
197 | if (limit <= 0) | |
6b8c90f2 | 198 | printk(KERN_INFO PFX "Pin status will not clear.\n"); |
1da177e4 LT |
199 | } |
200 | ||
201 | /* Function Description: Test busy bit. | |
202 | * Return : None. | |
203 | */ | |
204 | static void envctrl_i2c_test_bb(void) | |
205 | { | |
206 | int limit = 1000000; | |
207 | ||
208 | while (--limit > 0) { | |
209 | /* Busy bit 0 means busy. */ | |
210 | if (readb(i2c + PCF8584_CSR) & STATUS_BB) | |
211 | break; | |
212 | udelay(1); | |
213 | } | |
214 | ||
215 | if (limit <= 0) | |
6b8c90f2 | 216 | printk(KERN_INFO PFX "Busy bit will not clear.\n"); |
1da177e4 LT |
217 | } |
218 | ||
219 | /* Function Description: Send the address for a read access. | |
220 | * Return : 0 if not acknowledged, otherwise acknowledged. | |
221 | */ | |
222 | static int envctrl_i2c_read_addr(unsigned char addr) | |
223 | { | |
224 | envctrl_i2c_test_bb(); | |
225 | ||
226 | /* Load address. */ | |
227 | writeb(addr + 1, i2c + PCF8584_DATA); | |
228 | ||
229 | envctrl_i2c_test_bb(); | |
230 | ||
231 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
232 | ||
233 | /* Wait for PIN. */ | |
234 | envtrl_i2c_test_pin(); | |
235 | ||
236 | /* CSR 0 means acknowledged. */ | |
237 | if (!(readb(i2c + PCF8584_CSR) & STATUS_LRB)) { | |
238 | return readb(i2c + PCF8584_DATA); | |
239 | } else { | |
240 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
241 | return 0; | |
242 | } | |
243 | } | |
244 | ||
245 | /* Function Description: Send the address for write mode. | |
246 | * Return : None. | |
247 | */ | |
248 | static void envctrl_i2c_write_addr(unsigned char addr) | |
249 | { | |
250 | envctrl_i2c_test_bb(); | |
251 | writeb(addr, i2c + PCF8584_DATA); | |
252 | ||
253 | /* Generate Start condition. */ | |
254 | writeb(OBD_SEND_START, i2c + PCF8584_CSR); | |
255 | } | |
256 | ||
257 | /* Function Description: Read 1 byte of data from addr | |
258 | * set by envctrl_i2c_read_addr() | |
259 | * Return : Data from address set by envctrl_i2c_read_addr(). | |
260 | */ | |
261 | static unsigned char envctrl_i2c_read_data(void) | |
262 | { | |
263 | envtrl_i2c_test_pin(); | |
264 | writeb(CONTROL_ES0, i2c + PCF8584_CSR); /* Send neg ack. */ | |
265 | return readb(i2c + PCF8584_DATA); | |
266 | } | |
267 | ||
268 | /* Function Description: Instruct the device which port to read data from. | |
269 | * Return : None. | |
270 | */ | |
271 | static void envctrl_i2c_write_data(unsigned char port) | |
272 | { | |
273 | envtrl_i2c_test_pin(); | |
274 | writeb(port, i2c + PCF8584_DATA); | |
275 | } | |
276 | ||
277 | /* Function Description: Generate Stop condition after last byte is sent. | |
278 | * Return : None. | |
279 | */ | |
280 | static void envctrl_i2c_stop(void) | |
281 | { | |
282 | envtrl_i2c_test_pin(); | |
283 | writeb(OBD_SEND_STOP, i2c + PCF8584_CSR); | |
284 | } | |
285 | ||
286 | /* Function Description: Read adc device. | |
287 | * Return : Data at address and port. | |
288 | */ | |
289 | static unsigned char envctrl_i2c_read_8591(unsigned char addr, unsigned char port) | |
290 | { | |
291 | /* Send address. */ | |
292 | envctrl_i2c_write_addr(addr); | |
293 | ||
294 | /* Setup port to read. */ | |
295 | envctrl_i2c_write_data(port); | |
296 | envctrl_i2c_stop(); | |
297 | ||
298 | /* Read port. */ | |
299 | envctrl_i2c_read_addr(addr); | |
300 | ||
301 | /* Do a single byte read and send stop. */ | |
302 | envctrl_i2c_read_data(); | |
303 | envctrl_i2c_stop(); | |
304 | ||
305 | return readb(i2c + PCF8584_DATA); | |
306 | } | |
307 | ||
308 | /* Function Description: Read gpio device. | |
309 | * Return : Data at address. | |
310 | */ | |
311 | static unsigned char envctrl_i2c_read_8574(unsigned char addr) | |
312 | { | |
313 | unsigned char rd; | |
314 | ||
315 | envctrl_i2c_read_addr(addr); | |
316 | ||
317 | /* Do a single byte read and send stop. */ | |
318 | rd = envctrl_i2c_read_data(); | |
319 | envctrl_i2c_stop(); | |
320 | return rd; | |
321 | } | |
322 | ||
323 | /* Function Description: Decode data read from an adc device using firmware | |
324 | * table. | |
325 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
326 | */ | |
327 | static int envctrl_i2c_data_translate(unsigned char data, int translate_type, | |
328 | int scale, char *tbl, char *bufdata) | |
329 | { | |
330 | int len = 0; | |
331 | ||
332 | switch (translate_type) { | |
333 | case ENVCTRL_TRANSLATE_NO: | |
334 | /* No decode necessary. */ | |
335 | len = 1; | |
336 | bufdata[0] = data; | |
337 | break; | |
338 | ||
339 | case ENVCTRL_TRANSLATE_FULL: | |
340 | /* Decode this way: data = table[data]. */ | |
341 | len = 1; | |
342 | bufdata[0] = tbl[data]; | |
343 | break; | |
344 | ||
345 | case ENVCTRL_TRANSLATE_SCALE: | |
346 | /* Decode this way: data = table[data]/scale */ | |
347 | sprintf(bufdata,"%d ", (tbl[data] * 10) / (scale)); | |
348 | len = strlen(bufdata); | |
349 | bufdata[len - 1] = bufdata[len - 2]; | |
350 | bufdata[len - 2] = '.'; | |
351 | break; | |
352 | ||
353 | default: | |
354 | break; | |
da201161 | 355 | } |
1da177e4 LT |
356 | |
357 | return len; | |
358 | } | |
359 | ||
360 | /* Function Description: Read cpu-related data such as cpu temperature, voltage. | |
361 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
362 | */ | |
363 | static int envctrl_read_cpu_info(int cpu, struct i2c_child_t *pchild, | |
364 | char mon_type, unsigned char *bufdata) | |
365 | { | |
366 | unsigned char data; | |
367 | int i; | |
368 | char *tbl, j = -1; | |
369 | ||
370 | /* Find the right monitor type and channel. */ | |
371 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
372 | if (pchild->mon_type[i] == mon_type) { | |
373 | if (++j == cpu) { | |
374 | break; | |
375 | } | |
376 | } | |
377 | } | |
378 | ||
379 | if (j != cpu) | |
380 | return 0; | |
381 | ||
382 | /* Read data from address and port. */ | |
383 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
384 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
385 | ||
386 | /* Find decoding table. */ | |
387 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
388 | ||
389 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
390 | pchild->tblprop_array[i].scale, | |
391 | tbl, bufdata); | |
392 | } | |
393 | ||
394 | /* Function Description: Read noncpu-related data such as motherboard | |
395 | * temperature. | |
396 | * Return: Number of read bytes. Data is stored in bufdata in ascii format. | |
397 | */ | |
398 | static int envctrl_read_noncpu_info(struct i2c_child_t *pchild, | |
399 | char mon_type, unsigned char *bufdata) | |
400 | { | |
401 | unsigned char data; | |
402 | int i; | |
403 | char *tbl = NULL; | |
404 | ||
405 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
406 | if (pchild->mon_type[i] == mon_type) | |
407 | break; | |
408 | } | |
409 | ||
410 | if (i >= PCF8584_MAX_CHANNELS) | |
411 | return 0; | |
412 | ||
413 | /* Read data from address and port. */ | |
414 | data = envctrl_i2c_read_8591((unsigned char)pchild->addr, | |
415 | (unsigned char)pchild->chnl_array[i].chnl_no); | |
416 | ||
417 | /* Find decoding table. */ | |
418 | tbl = pchild->tables + pchild->tblprop_array[i].offset; | |
419 | ||
420 | return envctrl_i2c_data_translate(data, pchild->tblprop_array[i].type, | |
421 | pchild->tblprop_array[i].scale, | |
422 | tbl, bufdata); | |
423 | } | |
424 | ||
425 | /* Function Description: Read fan status. | |
426 | * Return : Always 1 byte. Status stored in bufdata. | |
427 | */ | |
428 | static int envctrl_i2c_fan_status(struct i2c_child_t *pchild, | |
429 | unsigned char data, | |
430 | char *bufdata) | |
431 | { | |
432 | unsigned char tmp, ret = 0; | |
433 | int i, j = 0; | |
434 | ||
435 | tmp = data & pchild->fan_mask; | |
436 | ||
437 | if (tmp == pchild->fan_mask) { | |
438 | /* All bits are on. All fans are functioning. */ | |
439 | ret = ENVCTRL_ALL_FANS_GOOD; | |
440 | } else if (tmp == 0) { | |
441 | /* No bits are on. No fans are functioning. */ | |
442 | ret = ENVCTRL_ALL_FANS_BAD; | |
443 | } else { | |
444 | /* Go through all channels, mark 'on' the matched bits. | |
445 | * Notice that fan_mask may have discontiguous bits but | |
446 | * return mask are always contiguous. For example if we | |
447 | * monitor 4 fans at channels 0,1,2,4, the return mask | |
448 | * should be 00010000 if only fan at channel 4 is working. | |
449 | */ | |
450 | for (i = 0; i < PCF8584_MAX_CHANNELS;i++) { | |
451 | if (pchild->fan_mask & chnls_mask[i]) { | |
452 | if (!(chnls_mask[i] & tmp)) | |
453 | ret |= chnls_mask[j]; | |
454 | ||
455 | j++; | |
456 | } | |
457 | } | |
458 | } | |
459 | ||
460 | bufdata[0] = ret; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | /* Function Description: Read global addressing line. | |
465 | * Return : Always 1 byte. Status stored in bufdata. | |
466 | */ | |
467 | static int envctrl_i2c_globaladdr(struct i2c_child_t *pchild, | |
468 | unsigned char data, | |
469 | char *bufdata) | |
470 | { | |
471 | /* Translatation table is not necessary, as global | |
472 | * addr is the integer value of the GA# bits. | |
473 | * | |
474 | * NOTE: MSB is documented as zero, but I see it as '1' always.... | |
475 | * | |
476 | * ----------------------------------------------- | |
477 | * | 0 | FAL | DEG | GA4 | GA3 | GA2 | GA1 | GA0 | | |
478 | * ----------------------------------------------- | |
479 | * GA0 - GA4 integer value of Global Address (backplane slot#) | |
480 | * DEG 0 = cPCI Power supply output is starting to degrade | |
481 | * 1 = cPCI Power supply output is OK | |
482 | * FAL 0 = cPCI Power supply has failed | |
483 | * 1 = cPCI Power supply output is OK | |
484 | */ | |
485 | bufdata[0] = (data & ENVCTRL_GLOBALADDR_ADDR_MASK); | |
486 | return 1; | |
487 | } | |
488 | ||
489 | /* Function Description: Read standard voltage and power supply status. | |
490 | * Return : Always 1 byte. Status stored in bufdata. | |
491 | */ | |
492 | static unsigned char envctrl_i2c_voltage_status(struct i2c_child_t *pchild, | |
493 | unsigned char data, | |
494 | char *bufdata) | |
495 | { | |
496 | unsigned char tmp, ret = 0; | |
497 | int i, j = 0; | |
498 | ||
499 | tmp = data & pchild->voltage_mask; | |
500 | ||
501 | /* Two channels are used to monitor voltage and power supply. */ | |
502 | if (tmp == pchild->voltage_mask) { | |
503 | /* All bits are on. Voltage and power supply are okay. */ | |
504 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_GOOD; | |
505 | } else if (tmp == 0) { | |
506 | /* All bits are off. Voltage and power supply are bad */ | |
507 | ret = ENVCTRL_VOLTAGE_POWERSUPPLY_BAD; | |
508 | } else { | |
509 | /* Either voltage or power supply has problem. */ | |
510 | for (i = 0; i < PCF8584_MAX_CHANNELS; i++) { | |
511 | if (pchild->voltage_mask & chnls_mask[i]) { | |
512 | j++; | |
513 | ||
514 | /* Break out when there is a mismatch. */ | |
515 | if (!(chnls_mask[i] & tmp)) | |
516 | break; | |
517 | } | |
518 | } | |
519 | ||
520 | /* Make a wish that hardware will always use the | |
521 | * first channel for voltage and the second for | |
522 | * power supply. | |
523 | */ | |
524 | if (j == 1) | |
525 | ret = ENVCTRL_VOLTAGE_BAD; | |
526 | else | |
527 | ret = ENVCTRL_POWERSUPPLY_BAD; | |
528 | } | |
529 | ||
530 | bufdata[0] = ret; | |
531 | return 1; | |
532 | } | |
533 | ||
534 | /* Function Description: Read a byte from /dev/envctrl. Mapped to user read(). | |
535 | * Return: Number of read bytes. 0 for error. | |
536 | */ | |
537 | static ssize_t | |
538 | envctrl_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
539 | { | |
540 | struct i2c_child_t *pchild; | |
541 | unsigned char data[10]; | |
542 | int ret = 0; | |
543 | ||
544 | /* Get the type of read as decided in ioctl() call. | |
545 | * Find the appropriate i2c child. | |
546 | * Get the data and put back to the user buffer. | |
547 | */ | |
548 | ||
549 | switch ((int)(long)file->private_data) { | |
550 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
551 | if (warning_temperature == 0) | |
552 | return 0; | |
553 | ||
554 | data[0] = (unsigned char)(warning_temperature); | |
555 | ret = 1; | |
556 | if (copy_to_user(buf, data, ret)) | |
557 | ret = -EFAULT; | |
558 | break; | |
559 | ||
560 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
561 | if (shutdown_temperature == 0) | |
562 | return 0; | |
563 | ||
564 | data[0] = (unsigned char)(shutdown_temperature); | |
565 | ret = 1; | |
566 | if (copy_to_user(buf, data, ret)) | |
567 | ret = -EFAULT; | |
568 | break; | |
569 | ||
570 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
571 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_MTHRBDTEMP_MON))) | |
572 | return 0; | |
573 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_MTHRBDTEMP_MON, data); | |
574 | if (copy_to_user(buf, data, ret)) | |
575 | ret = -EFAULT; | |
576 | break; | |
577 | ||
578 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
579 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) | |
580 | return 0; | |
581 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUTEMP_MON, data); | |
582 | ||
583 | /* Reset cpu to the default cpu0. */ | |
584 | if (copy_to_user(buf, data, ret)) | |
585 | ret = -EFAULT; | |
586 | break; | |
587 | ||
588 | case ENVCTRL_RD_CPU_VOLTAGE: | |
589 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_CPUVOLTAGE_MON))) | |
590 | return 0; | |
591 | ret = envctrl_read_cpu_info(read_cpu, pchild, ENVCTRL_CPUVOLTAGE_MON, data); | |
592 | ||
593 | /* Reset cpu to the default cpu0. */ | |
594 | if (copy_to_user(buf, data, ret)) | |
595 | ret = -EFAULT; | |
596 | break; | |
597 | ||
598 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
599 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_SCSITEMP_MON))) | |
600 | return 0; | |
601 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_SCSITEMP_MON, data); | |
602 | if (copy_to_user(buf, data, ret)) | |
603 | ret = -EFAULT; | |
604 | break; | |
605 | ||
606 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
607 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_ETHERTEMP_MON))) | |
608 | return 0; | |
609 | ret = envctrl_read_noncpu_info(pchild, ENVCTRL_ETHERTEMP_MON, data); | |
610 | if (copy_to_user(buf, data, ret)) | |
611 | ret = -EFAULT; | |
612 | break; | |
613 | ||
614 | case ENVCTRL_RD_FAN_STATUS: | |
615 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_FANSTAT_MON))) | |
616 | return 0; | |
617 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
618 | ret = envctrl_i2c_fan_status(pchild,data[0], data); | |
619 | if (copy_to_user(buf, data, ret)) | |
620 | ret = -EFAULT; | |
621 | break; | |
622 | ||
623 | case ENVCTRL_RD_GLOBALADDRESS: | |
624 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
625 | return 0; | |
626 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
627 | ret = envctrl_i2c_globaladdr(pchild, data[0], data); | |
628 | if (copy_to_user(buf, data, ret)) | |
629 | ret = -EFAULT; | |
630 | break; | |
631 | ||
632 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
633 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_VOLTAGESTAT_MON))) | |
634 | /* If voltage monitor not present, check for CPCI equivalent */ | |
635 | if (!(pchild = envctrl_get_i2c_child(ENVCTRL_GLOBALADDR_MON))) | |
636 | return 0; | |
637 | data[0] = envctrl_i2c_read_8574(pchild->addr); | |
638 | ret = envctrl_i2c_voltage_status(pchild, data[0], data); | |
639 | if (copy_to_user(buf, data, ret)) | |
640 | ret = -EFAULT; | |
641 | break; | |
642 | ||
643 | default: | |
644 | break; | |
645 | ||
da201161 | 646 | } |
1da177e4 LT |
647 | |
648 | return ret; | |
649 | } | |
650 | ||
651 | /* Function Description: Command what to read. Mapped to user ioctl(). | |
652 | * Return: Gives 0 for implemented commands, -EINVAL otherwise. | |
653 | */ | |
1928f8e5 CH |
654 | static long |
655 | envctrl_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1da177e4 LT |
656 | { |
657 | char __user *infobuf; | |
658 | ||
659 | switch (cmd) { | |
660 | case ENVCTRL_RD_WARNING_TEMPERATURE: | |
661 | case ENVCTRL_RD_SHUTDOWN_TEMPERATURE: | |
662 | case ENVCTRL_RD_MTHRBD_TEMPERATURE: | |
663 | case ENVCTRL_RD_FAN_STATUS: | |
664 | case ENVCTRL_RD_VOLTAGE_STATUS: | |
665 | case ENVCTRL_RD_ETHERNET_TEMPERATURE: | |
666 | case ENVCTRL_RD_SCSI_TEMPERATURE: | |
667 | case ENVCTRL_RD_GLOBALADDRESS: | |
668 | file->private_data = (void *)(long)cmd; | |
669 | break; | |
670 | ||
671 | case ENVCTRL_RD_CPU_TEMPERATURE: | |
672 | case ENVCTRL_RD_CPU_VOLTAGE: | |
673 | /* Check to see if application passes in any cpu number, | |
674 | * the default is cpu0. | |
675 | */ | |
676 | infobuf = (char __user *) arg; | |
677 | if (infobuf == NULL) { | |
678 | read_cpu = 0; | |
679 | }else { | |
680 | get_user(read_cpu, infobuf); | |
681 | } | |
682 | ||
683 | /* Save the command for use when reading. */ | |
684 | file->private_data = (void *)(long)cmd; | |
685 | break; | |
686 | ||
687 | default: | |
688 | return -EINVAL; | |
da201161 | 689 | } |
1da177e4 LT |
690 | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /* Function Description: open device. Mapped to user open(). | |
695 | * Return: Always 0. | |
696 | */ | |
697 | static int | |
698 | envctrl_open(struct inode *inode, struct file *file) | |
699 | { | |
700 | file->private_data = NULL; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* Function Description: Open device. Mapped to user close(). | |
705 | * Return: Always 0. | |
706 | */ | |
707 | static int | |
708 | envctrl_release(struct inode *inode, struct file *file) | |
709 | { | |
710 | return 0; | |
711 | } | |
712 | ||
00977a59 | 713 | static const struct file_operations envctrl_fops = { |
1928f8e5 CH |
714 | .owner = THIS_MODULE, |
715 | .read = envctrl_read, | |
716 | .unlocked_ioctl = envctrl_ioctl, | |
717 | #ifdef CONFIG_COMPAT | |
718 | .compat_ioctl = envctrl_ioctl, | |
719 | #endif | |
720 | .open = envctrl_open, | |
721 | .release = envctrl_release, | |
6038f373 | 722 | .llseek = noop_llseek, |
1da177e4 LT |
723 | }; |
724 | ||
725 | static struct miscdevice envctrl_dev = { | |
726 | ENVCTRL_MINOR, | |
727 | "envctrl", | |
728 | &envctrl_fops | |
729 | }; | |
730 | ||
731 | /* Function Description: Set monitor type based on firmware description. | |
732 | * Return: None. | |
733 | */ | |
734 | static void envctrl_set_mon(struct i2c_child_t *pchild, | |
ccf0dec6 | 735 | const char *chnl_desc, |
1da177e4 LT |
736 | int chnl_no) |
737 | { | |
738 | /* Firmware only has temperature type. It does not distinguish | |
739 | * different kinds of temperatures. We use channel description | |
740 | * to disinguish them. | |
741 | */ | |
742 | if (!(strcmp(chnl_desc,"temp,cpu")) || | |
743 | !(strcmp(chnl_desc,"temp,cpu0")) || | |
744 | !(strcmp(chnl_desc,"temp,cpu1")) || | |
745 | !(strcmp(chnl_desc,"temp,cpu2")) || | |
746 | !(strcmp(chnl_desc,"temp,cpu3"))) | |
747 | pchild->mon_type[chnl_no] = ENVCTRL_CPUTEMP_MON; | |
748 | ||
749 | if (!(strcmp(chnl_desc,"vddcore,cpu0")) || | |
750 | !(strcmp(chnl_desc,"vddcore,cpu1")) || | |
751 | !(strcmp(chnl_desc,"vddcore,cpu2")) || | |
752 | !(strcmp(chnl_desc,"vddcore,cpu3"))) | |
753 | pchild->mon_type[chnl_no] = ENVCTRL_CPUVOLTAGE_MON; | |
754 | ||
755 | if (!(strcmp(chnl_desc,"temp,motherboard"))) | |
756 | pchild->mon_type[chnl_no] = ENVCTRL_MTHRBDTEMP_MON; | |
757 | ||
758 | if (!(strcmp(chnl_desc,"temp,scsi"))) | |
759 | pchild->mon_type[chnl_no] = ENVCTRL_SCSITEMP_MON; | |
760 | ||
761 | if (!(strcmp(chnl_desc,"temp,ethernet"))) | |
762 | pchild->mon_type[chnl_no] = ENVCTRL_ETHERTEMP_MON; | |
763 | } | |
764 | ||
765 | /* Function Description: Initialize monitor channel with channel desc, | |
766 | * decoding tables, monitor type, optional properties. | |
767 | * Return: None. | |
768 | */ | |
690c8fd3 | 769 | static void envctrl_init_adc(struct i2c_child_t *pchild, struct device_node *dp) |
1da177e4 | 770 | { |
1da177e4 | 771 | int i = 0, len; |
ccf0dec6 SR |
772 | const char *pos; |
773 | const unsigned int *pval; | |
1da177e4 LT |
774 | |
775 | /* Firmware describe channels into a stream separated by a '\0'. */ | |
690c8fd3 | 776 | pos = of_get_property(dp, "channels-description", &len); |
1da177e4 LT |
777 | |
778 | while (len > 0) { | |
779 | int l = strlen(pos) + 1; | |
780 | envctrl_set_mon(pchild, pos, i++); | |
781 | len -= l; | |
782 | pos += l; | |
783 | } | |
784 | ||
785 | /* Get optional properties. */ | |
690c8fd3 DM |
786 | pval = of_get_property(dp, "warning-temp", NULL); |
787 | if (pval) | |
788 | warning_temperature = *pval; | |
789 | ||
790 | pval = of_get_property(dp, "shutdown-temp", NULL); | |
791 | if (pval) | |
792 | shutdown_temperature = *pval; | |
1da177e4 LT |
793 | } |
794 | ||
795 | /* Function Description: Initialize child device monitoring fan status. | |
796 | * Return: None. | |
797 | */ | |
798 | static void envctrl_init_fanstat(struct i2c_child_t *pchild) | |
799 | { | |
800 | int i; | |
801 | ||
802 | /* Go through all channels and set up the mask. */ | |
803 | for (i = 0; i < pchild->total_chnls; i++) | |
804 | pchild->fan_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
805 | ||
806 | /* We only need to know if this child has fan status monitored. | |
807 | * We don't care which channels since we have the mask already. | |
808 | */ | |
809 | pchild->mon_type[0] = ENVCTRL_FANSTAT_MON; | |
810 | } | |
811 | ||
812 | /* Function Description: Initialize child device for global addressing line. | |
813 | * Return: None. | |
814 | */ | |
815 | static void envctrl_init_globaladdr(struct i2c_child_t *pchild) | |
816 | { | |
817 | int i; | |
818 | ||
819 | /* Voltage/PowerSupply monitoring is piggybacked | |
820 | * with Global Address on CompactPCI. See comments | |
821 | * within envctrl_i2c_globaladdr for bit assignments. | |
822 | * | |
823 | * The mask is created here by assigning mask bits to each | |
824 | * bit position that represents PCF8584_VOLTAGE_TYPE data. | |
825 | * Channel numbers are not consecutive within the globaladdr | |
826 | * node (why?), so we use the actual counter value as chnls_mask | |
827 | * index instead of the chnl_array[x].chnl_no value. | |
828 | * | |
829 | * NOTE: This loop could be replaced with a constant representing | |
830 | * a mask of bits 5&6 (ENVCTRL_GLOBALADDR_PSTAT_MASK). | |
831 | */ | |
832 | for (i = 0; i < pchild->total_chnls; i++) { | |
833 | if (PCF8584_VOLTAGE_TYPE == pchild->chnl_array[i].type) { | |
834 | pchild->voltage_mask |= chnls_mask[i]; | |
835 | } | |
836 | } | |
837 | ||
838 | /* We only need to know if this child has global addressing | |
839 | * line monitored. We don't care which channels since we know | |
840 | * the mask already (ENVCTRL_GLOBALADDR_ADDR_MASK). | |
841 | */ | |
842 | pchild->mon_type[0] = ENVCTRL_GLOBALADDR_MON; | |
843 | } | |
844 | ||
845 | /* Initialize child device monitoring voltage status. */ | |
846 | static void envctrl_init_voltage_status(struct i2c_child_t *pchild) | |
847 | { | |
848 | int i; | |
849 | ||
850 | /* Go through all channels and set up the mask. */ | |
851 | for (i = 0; i < pchild->total_chnls; i++) | |
852 | pchild->voltage_mask |= chnls_mask[(pchild->chnl_array[i]).chnl_no]; | |
853 | ||
854 | /* We only need to know if this child has voltage status monitored. | |
855 | * We don't care which channels since we have the mask already. | |
856 | */ | |
857 | pchild->mon_type[0] = ENVCTRL_VOLTAGESTAT_MON; | |
858 | } | |
859 | ||
860 | /* Function Description: Initialize i2c child device. | |
861 | * Return: None. | |
862 | */ | |
6b8c90f2 | 863 | static void envctrl_init_i2c_child(struct device_node *dp, |
1da177e4 LT |
864 | struct i2c_child_t *pchild) |
865 | { | |
690c8fd3 | 866 | int len, i, tbls_size = 0; |
ccf0dec6 | 867 | const void *pval; |
1da177e4 LT |
868 | |
869 | /* Get device address. */ | |
690c8fd3 DM |
870 | pval = of_get_property(dp, "reg", &len); |
871 | memcpy(&pchild->addr, pval, len); | |
1da177e4 LT |
872 | |
873 | /* Get tables property. Read firmware temperature tables. */ | |
690c8fd3 DM |
874 | pval = of_get_property(dp, "translation", &len); |
875 | if (pval && len > 0) { | |
876 | memcpy(pchild->tblprop_array, pval, len); | |
1da177e4 LT |
877 | pchild->total_tbls = len / sizeof(struct pcf8584_tblprop); |
878 | for (i = 0; i < pchild->total_tbls; i++) { | |
879 | if ((pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset) > tbls_size) { | |
880 | tbls_size = pchild->tblprop_array[i].size + pchild->tblprop_array[i].offset; | |
881 | } | |
882 | } | |
883 | ||
884 | pchild->tables = kmalloc(tbls_size, GFP_KERNEL); | |
885 | if (pchild->tables == NULL){ | |
6b8c90f2 | 886 | printk(KERN_ERR PFX "Failed to allocate table.\n"); |
1da177e4 LT |
887 | return; |
888 | } | |
690c8fd3 DM |
889 | pval = of_get_property(dp, "tables", &len); |
890 | if (!pval || len <= 0) { | |
6b8c90f2 | 891 | printk(KERN_ERR PFX "Failed to get table.\n"); |
1da177e4 LT |
892 | return; |
893 | } | |
690c8fd3 | 894 | memcpy(pchild->tables, pval, len); |
1da177e4 LT |
895 | } |
896 | ||
897 | /* SPARCengine ASM Reference Manual (ref. SMI doc 805-7581-04) | |
898 | * sections 2.5, 3.5, 4.5 state node 0x70 for CP1400/1500 is | |
899 | * "For Factory Use Only." | |
900 | * | |
901 | * We ignore the node on these platforms by assigning the | |
902 | * 'NULL' monitor type. | |
903 | */ | |
904 | if (ENVCTRL_CPCI_IGNORED_NODE == pchild->addr) { | |
690c8fd3 | 905 | struct device_node *root_node; |
1da177e4 | 906 | int len; |
1da177e4 | 907 | |
690c8fd3 DM |
908 | root_node = of_find_node_by_path("/"); |
909 | if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) { | |
1da177e4 LT |
910 | for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) { |
911 | pchild->mon_type[len] = ENVCTRL_NOMON; | |
912 | } | |
913 | return; | |
914 | } | |
915 | } | |
916 | ||
917 | /* Get the monitor channels. */ | |
690c8fd3 DM |
918 | pval = of_get_property(dp, "channels-in-use", &len); |
919 | memcpy(pchild->chnl_array, pval, len); | |
1da177e4 LT |
920 | pchild->total_chnls = len / sizeof(struct pcf8584_channel); |
921 | ||
922 | for (i = 0; i < pchild->total_chnls; i++) { | |
923 | switch (pchild->chnl_array[i].type) { | |
924 | case PCF8584_TEMP_TYPE: | |
690c8fd3 | 925 | envctrl_init_adc(pchild, dp); |
1da177e4 LT |
926 | break; |
927 | ||
928 | case PCF8584_GLOBALADDR_TYPE: | |
929 | envctrl_init_globaladdr(pchild); | |
930 | i = pchild->total_chnls; | |
931 | break; | |
932 | ||
933 | case PCF8584_FANSTAT_TYPE: | |
934 | envctrl_init_fanstat(pchild); | |
935 | i = pchild->total_chnls; | |
936 | break; | |
937 | ||
938 | case PCF8584_VOLTAGE_TYPE: | |
939 | if (pchild->i2ctype == I2C_ADC) { | |
690c8fd3 | 940 | envctrl_init_adc(pchild,dp); |
1da177e4 LT |
941 | } else { |
942 | envctrl_init_voltage_status(pchild); | |
943 | } | |
944 | i = pchild->total_chnls; | |
945 | break; | |
946 | ||
947 | default: | |
948 | break; | |
da201161 | 949 | } |
1da177e4 LT |
950 | } |
951 | } | |
952 | ||
953 | /* Function Description: Search the child device list for a device. | |
954 | * Return : The i2c child if found. NULL otherwise. | |
955 | */ | |
956 | static struct i2c_child_t *envctrl_get_i2c_child(unsigned char mon_type) | |
957 | { | |
958 | int i, j; | |
959 | ||
960 | for (i = 0; i < ENVCTRL_MAX_CPU*2; i++) { | |
961 | for (j = 0; j < PCF8584_MAX_CHANNELS; j++) { | |
962 | if (i2c_childlist[i].mon_type[j] == mon_type) { | |
963 | return (struct i2c_child_t *)(&(i2c_childlist[i])); | |
964 | } | |
965 | } | |
966 | } | |
967 | return NULL; | |
968 | } | |
969 | ||
970 | static void envctrl_do_shutdown(void) | |
971 | { | |
972 | static int inprog = 0; | |
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"); | |
7975a9b7 | 979 | orderly_poweroff(true); |
1da177e4 LT |
980 | } |
981 | ||
982 | static struct task_struct *kenvctrld_task; | |
983 | ||
984 | static int kenvctrld(void *__unused) | |
985 | { | |
986 | int poll_interval; | |
987 | int whichcpu; | |
988 | char tempbuf[10]; | |
989 | struct i2c_child_t *cputemp; | |
990 | ||
991 | if (NULL == (cputemp = envctrl_get_i2c_child(ENVCTRL_CPUTEMP_MON))) { | |
6b8c90f2 DM |
992 | printk(KERN_ERR PFX |
993 | "kenvctrld unable to monitor CPU temp-- exiting\n"); | |
1da177e4 LT |
994 | return -ENODEV; |
995 | } | |
996 | ||
cb39d263 | 997 | poll_interval = 5000; /* TODO env_mon_interval */ |
1da177e4 | 998 | |
6b8c90f2 | 999 | printk(KERN_INFO PFX "%s starting...\n", current->comm); |
1da177e4 | 1000 | for (;;) { |
218b29e0 | 1001 | msleep_interruptible(poll_interval); |
1da177e4 | 1002 | |
218b29e0 CH |
1003 | if (kthread_should_stop()) |
1004 | break; | |
1005 | ||
1da177e4 LT |
1006 | for (whichcpu = 0; whichcpu < ENVCTRL_MAX_CPU; ++whichcpu) { |
1007 | if (0 < envctrl_read_cpu_info(whichcpu, cputemp, | |
1008 | ENVCTRL_CPUTEMP_MON, | |
1009 | tempbuf)) { | |
1010 | if (tempbuf[0] >= shutdown_temperature) { | |
1011 | printk(KERN_CRIT | |
1012 | "%s: WARNING: CPU%i temperature %i C meets or exceeds "\ | |
1013 | "shutdown threshold %i C\n", | |
1014 | current->comm, whichcpu, | |
1015 | tempbuf[0], shutdown_temperature); | |
1016 | envctrl_do_shutdown(); | |
1017 | } | |
1018 | } | |
1019 | } | |
1020 | } | |
6b8c90f2 | 1021 | printk(KERN_INFO PFX "%s exiting...\n", current->comm); |
1da177e4 LT |
1022 | return 0; |
1023 | } | |
1024 | ||
082a2004 | 1025 | static int envctrl_probe(struct platform_device *op) |
1da177e4 | 1026 | { |
6b8c90f2 DM |
1027 | struct device_node *dp; |
1028 | int index, err; | |
1da177e4 | 1029 | |
6b8c90f2 DM |
1030 | if (i2c) |
1031 | return -EINVAL; | |
1032 | ||
1033 | i2c = of_ioremap(&op->resource[0], 0, 0x2, DRIVER_NAME); | |
1034 | if (!i2c) | |
1035 | return -ENOMEM; | |
1036 | ||
1037 | index = 0; | |
61c7a080 | 1038 | dp = op->dev.of_node->child; |
6b8c90f2 DM |
1039 | while (dp) { |
1040 | if (!strcmp(dp->name, "gpio")) { | |
1041 | i2c_childlist[index].i2ctype = I2C_GPIO; | |
1042 | envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); | |
1043 | } else if (!strcmp(dp->name, "adc")) { | |
1044 | i2c_childlist[index].i2ctype = I2C_ADC; | |
1045 | envctrl_init_i2c_child(dp, &(i2c_childlist[index++])); | |
1da177e4 | 1046 | } |
1da177e4 | 1047 | |
6b8c90f2 | 1048 | dp = dp->sibling; |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | /* Set device address. */ | |
1052 | writeb(CONTROL_PIN, i2c + PCF8584_CSR); | |
1053 | writeb(PCF8584_ADDRESS, i2c + PCF8584_DATA); | |
1054 | ||
1055 | /* Set system clock and SCL frequencies. */ | |
1056 | writeb(CONTROL_PIN | CONTROL_ES1, i2c + PCF8584_CSR); | |
1057 | writeb(CLK_4_43 | BUS_CLK_90, i2c + PCF8584_DATA); | |
1058 | ||
1059 | /* Enable serial interface. */ | |
1060 | writeb(CONTROL_PIN | CONTROL_ES0 | CONTROL_ACK, i2c + PCF8584_CSR); | |
1061 | udelay(200); | |
1062 | ||
1063 | /* Register the device as a minor miscellaneous device. */ | |
1064 | err = misc_register(&envctrl_dev); | |
1065 | if (err) { | |
6b8c90f2 | 1066 | printk(KERN_ERR PFX "Unable to get misc minor %d\n", |
1da177e4 LT |
1067 | envctrl_dev.minor); |
1068 | goto out_iounmap; | |
1069 | } | |
1070 | ||
1071 | /* Note above traversal routine post-incremented 'i' to accommodate | |
1072 | * a next child device, so we decrement before reverse-traversal of | |
1073 | * child devices. | |
1074 | */ | |
6b8c90f2 DM |
1075 | printk(KERN_INFO PFX "Initialized "); |
1076 | for (--index; index >= 0; --index) { | |
1da177e4 | 1077 | printk("[%s 0x%lx]%s", |
6b8c90f2 DM |
1078 | (I2C_ADC == i2c_childlist[index].i2ctype) ? "adc" : |
1079 | ((I2C_GPIO == i2c_childlist[index].i2ctype) ? "gpio" : "unknown"), | |
1080 | i2c_childlist[index].addr, (0 == index) ? "\n" : " "); | |
1da177e4 LT |
1081 | } |
1082 | ||
218b29e0 CH |
1083 | kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); |
1084 | if (IS_ERR(kenvctrld_task)) { | |
38c1844b | 1085 | err = PTR_ERR(kenvctrld_task); |
1da177e4 | 1086 | goto out_deregister; |
218b29e0 | 1087 | } |
1da177e4 LT |
1088 | |
1089 | return 0; | |
1090 | ||
1091 | out_deregister: | |
1092 | misc_deregister(&envctrl_dev); | |
1093 | out_iounmap: | |
6b8c90f2 DM |
1094 | of_iounmap(&op->resource[0], i2c, 0x2); |
1095 | for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) | |
1096 | kfree(i2c_childlist[index].tables); | |
6044ec88 | 1097 | |
1da177e4 | 1098 | return err; |
1da177e4 LT |
1099 | } |
1100 | ||
082a2004 | 1101 | static int envctrl_remove(struct platform_device *op) |
1da177e4 | 1102 | { |
6b8c90f2 | 1103 | int index; |
1da177e4 | 1104 | |
218b29e0 | 1105 | kthread_stop(kenvctrld_task); |
1da177e4 | 1106 | |
6b8c90f2 | 1107 | of_iounmap(&op->resource[0], i2c, 0x2); |
1da177e4 LT |
1108 | misc_deregister(&envctrl_dev); |
1109 | ||
6b8c90f2 DM |
1110 | for (index = 0; index < ENVCTRL_MAX_CPU * 2; index++) |
1111 | kfree(i2c_childlist[index].tables); | |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
fd098316 | 1116 | static const struct of_device_id envctrl_match[] = { |
6b8c90f2 DM |
1117 | { |
1118 | .name = "i2c", | |
1119 | .compatible = "i2cpcf,8584", | |
1120 | }, | |
1121 | {}, | |
1122 | }; | |
1123 | MODULE_DEVICE_TABLE(of, envctrl_match); | |
1124 | ||
4ebb24f7 | 1125 | static struct platform_driver envctrl_driver = { |
4018294b GL |
1126 | .driver = { |
1127 | .name = DRIVER_NAME, | |
4018294b GL |
1128 | .of_match_table = envctrl_match, |
1129 | }, | |
6b8c90f2 | 1130 | .probe = envctrl_probe, |
082a2004 | 1131 | .remove = envctrl_remove, |
6b8c90f2 DM |
1132 | }; |
1133 | ||
dbf2b92d | 1134 | module_platform_driver(envctrl_driver); |
1da177e4 | 1135 | |
1da177e4 | 1136 | MODULE_LICENSE("GPL"); |