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2
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4
5
6#include <linux/bitfield.h>
7#include <linux/bitops.h>
8#include <linux/debugfs.h>
9#include <linux/device.h>
10#include <linux/fs.h>
11#include <linux/i2c.h>
12#include <linux/jiffies.h>
13#include <linux/leds.h>
14#include <linux/module.h>
15#include <linux/mutex.h>
16#include <linux/of_device.h>
17#include <linux/pmbus.h>
18
19#include "pmbus.h"
20
21#define CFFPS_FRU_CMD 0x9A
22#define CFFPS_PN_CMD 0x9B
23#define CFFPS_HEADER_CMD 0x9C
24#define CFFPS_SN_CMD 0x9E
25#define CFFPS_MAX_POWER_OUT_CMD 0xA7
26#define CFFPS_CCIN_CMD 0xBD
27#define CFFPS_FW_CMD 0xFA
28#define CFFPS1_FW_NUM_BYTES 4
29#define CFFPS2_FW_NUM_WORDS 3
30#define CFFPS_SYS_CONFIG_CMD 0xDA
31#define CFFPS_12VCS_VOUT_CMD 0xDE
32
33#define CFFPS_INPUT_HISTORY_CMD 0xD6
34#define CFFPS_INPUT_HISTORY_SIZE 100
35
36#define CFFPS_CCIN_REVISION GENMASK(7, 0)
37#define CFFPS_CCIN_REVISION_LEGACY 0xde
38#define CFFPS_CCIN_VERSION GENMASK(15, 8)
39#define CFFPS_CCIN_VERSION_1 0x2b
40#define CFFPS_CCIN_VERSION_2 0x2e
41#define CFFPS_CCIN_VERSION_3 0x51
42
43
44#define CFFPS_MFR_FAN_FAULT BIT(0)
45#define CFFPS_MFR_THERMAL_FAULT BIT(1)
46#define CFFPS_MFR_OV_FAULT BIT(2)
47#define CFFPS_MFR_UV_FAULT BIT(3)
48#define CFFPS_MFR_PS_KILL BIT(4)
49#define CFFPS_MFR_OC_FAULT BIT(5)
50#define CFFPS_MFR_VAUX_FAULT BIT(6)
51#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)
52
53#define CFFPS_LED_BLINK BIT(0)
54#define CFFPS_LED_ON BIT(1)
55#define CFFPS_LED_OFF BIT(2)
56#define CFFPS_BLINK_RATE_MS 250
57
58enum {
59 CFFPS_DEBUGFS_INPUT_HISTORY = 0,
60 CFFPS_DEBUGFS_FRU,
61 CFFPS_DEBUGFS_PN,
62 CFFPS_DEBUGFS_HEADER,
63 CFFPS_DEBUGFS_SN,
64 CFFPS_DEBUGFS_MAX_POWER_OUT,
65 CFFPS_DEBUGFS_CCIN,
66 CFFPS_DEBUGFS_FW,
67 CFFPS_DEBUGFS_ON_OFF_CONFIG,
68 CFFPS_DEBUGFS_NUM_ENTRIES
69};
70
71enum versions { cffps1, cffps2, cffps_unknown };
72
73struct ibm_cffps_input_history {
74 struct mutex update_lock;
75 unsigned long last_update;
76
77 u8 byte_count;
78 u8 data[CFFPS_INPUT_HISTORY_SIZE];
79};
80
81struct ibm_cffps {
82 enum versions version;
83 struct i2c_client *client;
84
85 struct ibm_cffps_input_history input_history;
86
87 int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];
88
89 char led_name[32];
90 u8 led_state;
91 struct led_classdev led;
92};
93
94#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
95
96static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
97 char __user *buf, size_t count,
98 loff_t *ppos)
99{
100 int rc;
101 u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
102 u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
103 struct i2c_msg msg[2] = {
104 {
105 .addr = psu->client->addr,
106 .flags = psu->client->flags,
107 .len = 1,
108 .buf = msgbuf0,
109 }, {
110 .addr = psu->client->addr,
111 .flags = psu->client->flags | I2C_M_RD,
112 .len = CFFPS_INPUT_HISTORY_SIZE + 1,
113 .buf = msgbuf1,
114 },
115 };
116
117 if (!*ppos) {
118 mutex_lock(&psu->input_history.update_lock);
119 if (time_after(jiffies, psu->input_history.last_update + HZ)) {
120
121
122
123
124 rc = i2c_transfer(psu->client->adapter, msg, 2);
125 if (rc < 0) {
126 mutex_unlock(&psu->input_history.update_lock);
127 return rc;
128 }
129
130 psu->input_history.byte_count = msgbuf1[0];
131 memcpy(psu->input_history.data, &msgbuf1[1],
132 CFFPS_INPUT_HISTORY_SIZE);
133 psu->input_history.last_update = jiffies;
134 }
135
136 mutex_unlock(&psu->input_history.update_lock);
137 }
138
139 return simple_read_from_buffer(buf, count, ppos,
140 psu->input_history.data,
141 psu->input_history.byte_count);
142}
143
144static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
145 size_t count, loff_t *ppos)
146{
147 u8 cmd;
148 int i, rc;
149 int *idxp = file->private_data;
150 int idx = *idxp;
151 struct ibm_cffps *psu = to_psu(idxp, idx);
152 char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
153
154 pmbus_set_page(psu->client, 0, 0xff);
155
156 switch (idx) {
157 case CFFPS_DEBUGFS_INPUT_HISTORY:
158 return ibm_cffps_read_input_history(psu, buf, count, ppos);
159 case CFFPS_DEBUGFS_FRU:
160 cmd = CFFPS_FRU_CMD;
161 break;
162 case CFFPS_DEBUGFS_PN:
163 cmd = CFFPS_PN_CMD;
164 break;
165 case CFFPS_DEBUGFS_HEADER:
166 cmd = CFFPS_HEADER_CMD;
167 break;
168 case CFFPS_DEBUGFS_SN:
169 cmd = CFFPS_SN_CMD;
170 break;
171 case CFFPS_DEBUGFS_MAX_POWER_OUT:
172 rc = i2c_smbus_read_word_swapped(psu->client,
173 CFFPS_MAX_POWER_OUT_CMD);
174 if (rc < 0)
175 return rc;
176
177 rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
178 goto done;
179 case CFFPS_DEBUGFS_CCIN:
180 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
181 if (rc < 0)
182 return rc;
183
184 rc = snprintf(data, 5, "%04X", rc);
185 goto done;
186 case CFFPS_DEBUGFS_FW:
187 switch (psu->version) {
188 case cffps1:
189 for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
190 rc = i2c_smbus_read_byte_data(psu->client,
191 CFFPS_FW_CMD +
192 i);
193 if (rc < 0)
194 return rc;
195
196 snprintf(&data[i * 2], 3, "%02X", rc);
197 }
198
199 rc = i * 2;
200 break;
201 case cffps2:
202 for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
203 rc = i2c_smbus_read_word_data(psu->client,
204 CFFPS_FW_CMD +
205 i);
206 if (rc < 0)
207 return rc;
208
209 snprintf(&data[i * 4], 5, "%04X", rc);
210 }
211
212 rc = i * 4;
213 break;
214 default:
215 return -EOPNOTSUPP;
216 }
217 goto done;
218 case CFFPS_DEBUGFS_ON_OFF_CONFIG:
219 rc = i2c_smbus_read_byte_data(psu->client,
220 PMBUS_ON_OFF_CONFIG);
221 if (rc < 0)
222 return rc;
223
224 rc = snprintf(data, 3, "%02x", rc);
225 goto done;
226 default:
227 return -EINVAL;
228 }
229
230 rc = i2c_smbus_read_block_data(psu->client, cmd, data);
231 if (rc < 0)
232 return rc;
233
234done:
235 data[rc] = '\n';
236 rc += 2;
237
238 return simple_read_from_buffer(buf, count, ppos, data, rc);
239}
240
241static ssize_t ibm_cffps_debugfs_write(struct file *file,
242 const char __user *buf, size_t count,
243 loff_t *ppos)
244{
245 u8 data;
246 ssize_t rc;
247 int *idxp = file->private_data;
248 int idx = *idxp;
249 struct ibm_cffps *psu = to_psu(idxp, idx);
250
251 switch (idx) {
252 case CFFPS_DEBUGFS_ON_OFF_CONFIG:
253 pmbus_set_page(psu->client, 0, 0xff);
254
255 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
256 if (rc <= 0)
257 return rc;
258
259 rc = i2c_smbus_write_byte_data(psu->client,
260 PMBUS_ON_OFF_CONFIG, data);
261 if (rc)
262 return rc;
263
264 rc = 1;
265 break;
266 default:
267 return -EINVAL;
268 }
269
270 return rc;
271}
272
273static const struct file_operations ibm_cffps_fops = {
274 .llseek = noop_llseek,
275 .read = ibm_cffps_debugfs_read,
276 .write = ibm_cffps_debugfs_write,
277 .open = simple_open,
278};
279
280static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
281 int reg)
282{
283 int rc, mfr;
284
285 switch (reg) {
286 case PMBUS_STATUS_VOUT:
287 case PMBUS_STATUS_IOUT:
288 case PMBUS_STATUS_TEMPERATURE:
289 case PMBUS_STATUS_FAN_12:
290 rc = pmbus_read_byte_data(client, page, reg);
291 if (rc < 0)
292 return rc;
293
294 mfr = pmbus_read_byte_data(client, page,
295 PMBUS_STATUS_MFR_SPECIFIC);
296 if (mfr < 0)
297
298
299
300
301 return rc;
302
303
304 if (reg == PMBUS_STATUS_FAN_12) {
305 if (mfr & CFFPS_MFR_FAN_FAULT)
306 rc |= PB_FAN_FAN1_FAULT;
307 } else if (reg == PMBUS_STATUS_TEMPERATURE) {
308 if (mfr & CFFPS_MFR_THERMAL_FAULT)
309 rc |= PB_TEMP_OT_FAULT;
310 } else if (reg == PMBUS_STATUS_VOUT) {
311 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
312 rc |= PB_VOLTAGE_OV_FAULT;
313 if (mfr & CFFPS_MFR_UV_FAULT)
314 rc |= PB_VOLTAGE_UV_FAULT;
315 } else if (reg == PMBUS_STATUS_IOUT) {
316 if (mfr & CFFPS_MFR_OC_FAULT)
317 rc |= PB_IOUT_OC_FAULT;
318 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
319 rc |= PB_CURRENT_SHARE_FAULT;
320 }
321 break;
322 default:
323 rc = -ENODATA;
324 break;
325 }
326
327 return rc;
328}
329
330static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
331 int phase, int reg)
332{
333 int rc, mfr;
334
335 switch (reg) {
336 case PMBUS_STATUS_WORD:
337 rc = pmbus_read_word_data(client, page, phase, reg);
338 if (rc < 0)
339 return rc;
340
341 mfr = pmbus_read_byte_data(client, page,
342 PMBUS_STATUS_MFR_SPECIFIC);
343 if (mfr < 0)
344
345
346
347
348 return rc;
349
350 if (mfr & CFFPS_MFR_PS_KILL)
351 rc |= PB_STATUS_OFF;
352 break;
353 case PMBUS_VIRT_READ_VMON:
354 rc = pmbus_read_word_data(client, page, phase,
355 CFFPS_12VCS_VOUT_CMD);
356 break;
357 default:
358 rc = -ENODATA;
359 break;
360 }
361
362 return rc;
363}
364
365static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
366 enum led_brightness brightness)
367{
368 int rc;
369 u8 next_led_state;
370 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
371
372 if (brightness == LED_OFF) {
373 next_led_state = CFFPS_LED_OFF;
374 } else {
375 brightness = LED_FULL;
376
377 if (psu->led_state != CFFPS_LED_BLINK)
378 next_led_state = CFFPS_LED_ON;
379 else
380 next_led_state = CFFPS_LED_BLINK;
381 }
382
383 dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
384 brightness, next_led_state);
385
386 pmbus_set_page(psu->client, 0, 0xff);
387
388 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
389 next_led_state);
390 if (rc < 0)
391 return rc;
392
393 psu->led_state = next_led_state;
394 led_cdev->brightness = brightness;
395
396 return 0;
397}
398
399static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
400 unsigned long *delay_on,
401 unsigned long *delay_off)
402{
403 int rc;
404 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
405
406 dev_dbg(&psu->client->dev, "LED blink set.\n");
407
408 pmbus_set_page(psu->client, 0, 0xff);
409
410 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
411 CFFPS_LED_BLINK);
412 if (rc < 0)
413 return rc;
414
415 psu->led_state = CFFPS_LED_BLINK;
416 led_cdev->brightness = LED_FULL;
417 *delay_on = CFFPS_BLINK_RATE_MS;
418 *delay_off = CFFPS_BLINK_RATE_MS;
419
420 return 0;
421}
422
423static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
424{
425 int rc;
426 struct i2c_client *client = psu->client;
427 struct device *dev = &client->dev;
428
429 snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
430 client->addr);
431 psu->led.name = psu->led_name;
432 psu->led.max_brightness = LED_FULL;
433 psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
434 psu->led.blink_set = ibm_cffps_led_blink_set;
435
436 rc = devm_led_classdev_register(dev, &psu->led);
437 if (rc)
438 dev_warn(dev, "failed to register led class: %d\n", rc);
439 else
440 i2c_smbus_write_byte_data(client, CFFPS_SYS_CONFIG_CMD,
441 CFFPS_LED_OFF);
442}
443
444static struct pmbus_driver_info ibm_cffps_info[] = {
445 [cffps1] = {
446 .pages = 1,
447 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
448 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
449 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
450 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
451 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
452 PMBUS_HAVE_STATUS_FAN12,
453 .read_byte_data = ibm_cffps_read_byte_data,
454 .read_word_data = ibm_cffps_read_word_data,
455 },
456 [cffps2] = {
457 .pages = 2,
458 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
459 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
460 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
461 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
462 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
463 PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_VMON,
464 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
465 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
466 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
467 .read_byte_data = ibm_cffps_read_byte_data,
468 .read_word_data = ibm_cffps_read_word_data,
469 },
470};
471
472static struct pmbus_platform_data ibm_cffps_pdata = {
473 .flags = PMBUS_SKIP_STATUS_CHECK,
474};
475
476static int ibm_cffps_probe(struct i2c_client *client,
477 const struct i2c_device_id *id)
478{
479 int i, rc;
480 enum versions vs = cffps_unknown;
481 struct dentry *debugfs;
482 struct dentry *ibm_cffps_dir;
483 struct ibm_cffps *psu;
484 const void *md = of_device_get_match_data(&client->dev);
485
486 if (md)
487 vs = (enum versions)md;
488 else if (id)
489 vs = (enum versions)id->driver_data;
490
491 if (vs == cffps_unknown) {
492 u16 ccin_revision = 0;
493 u16 ccin_version = CFFPS_CCIN_VERSION_1;
494 int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
495
496 if (ccin > 0) {
497 ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);
498 ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
499 }
500
501 switch (ccin_version) {
502 default:
503 case CFFPS_CCIN_VERSION_1:
504 vs = cffps1;
505 break;
506 case CFFPS_CCIN_VERSION_2:
507 vs = cffps2;
508 break;
509 case CFFPS_CCIN_VERSION_3:
510 if (ccin_revision == CFFPS_CCIN_REVISION_LEGACY)
511 vs = cffps1;
512 else
513 vs = cffps2;
514 break;
515 }
516
517
518 snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
519 }
520
521 client->dev.platform_data = &ibm_cffps_pdata;
522 rc = pmbus_do_probe(client, id, &ibm_cffps_info[vs]);
523 if (rc)
524 return rc;
525
526
527
528
529
530 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
531 if (!psu)
532 return 0;
533
534 psu->version = vs;
535 psu->client = client;
536 mutex_init(&psu->input_history.update_lock);
537 psu->input_history.last_update = jiffies - HZ;
538
539 ibm_cffps_create_led_class(psu);
540
541
542 debugfs = pmbus_get_debugfs_dir(client);
543 if (!debugfs)
544 return 0;
545
546 ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
547 if (!ibm_cffps_dir)
548 return 0;
549
550 for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
551 psu->debugfs_entries[i] = i;
552
553 debugfs_create_file("input_history", 0444, ibm_cffps_dir,
554 &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
555 &ibm_cffps_fops);
556 debugfs_create_file("fru", 0444, ibm_cffps_dir,
557 &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
558 &ibm_cffps_fops);
559 debugfs_create_file("part_number", 0444, ibm_cffps_dir,
560 &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
561 &ibm_cffps_fops);
562 debugfs_create_file("header", 0444, ibm_cffps_dir,
563 &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
564 &ibm_cffps_fops);
565 debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
566 &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
567 &ibm_cffps_fops);
568 debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
569 &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
570 &ibm_cffps_fops);
571 debugfs_create_file("ccin", 0444, ibm_cffps_dir,
572 &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
573 &ibm_cffps_fops);
574 debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
575 &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
576 &ibm_cffps_fops);
577 debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
578 &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
579 &ibm_cffps_fops);
580
581 return 0;
582}
583
584static const struct i2c_device_id ibm_cffps_id[] = {
585 { "ibm_cffps1", cffps1 },
586 { "ibm_cffps2", cffps2 },
587 { "ibm_cffps", cffps_unknown },
588 {}
589};
590MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
591
592static const struct of_device_id ibm_cffps_of_match[] = {
593 {
594 .compatible = "ibm,cffps1",
595 .data = (void *)cffps1
596 },
597 {
598 .compatible = "ibm,cffps2",
599 .data = (void *)cffps2
600 },
601 {
602 .compatible = "ibm,cffps",
603 .data = (void *)cffps_unknown
604 },
605 {}
606};
607MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
608
609static struct i2c_driver ibm_cffps_driver = {
610 .driver = {
611 .name = "ibm-cffps",
612 .of_match_table = ibm_cffps_of_match,
613 },
614 .probe = ibm_cffps_probe,
615 .remove = pmbus_do_remove,
616 .id_table = ibm_cffps_id,
617};
618
619module_i2c_driver(ibm_cffps_driver);
620
621MODULE_AUTHOR("Eddie James");
622MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
623MODULE_LICENSE("GPL");
624
