1
2
3
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) | BIT(6))
54#define CFFPS_LED_ON (BIT(1) | BIT(6))
55#define CFFPS_LED_OFF (BIT(2) | BIT(6))
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
94static const struct i2c_device_id ibm_cffps_id[];
95
96#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])
97
98static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu,
99 char __user *buf, size_t count,
100 loff_t *ppos)
101{
102 int rc;
103 u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD };
104 u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 };
105 struct i2c_msg msg[2] = {
106 {
107 .addr = psu->client->addr,
108 .flags = psu->client->flags,
109 .len = 1,
110 .buf = msgbuf0,
111 }, {
112 .addr = psu->client->addr,
113 .flags = psu->client->flags | I2C_M_RD,
114 .len = CFFPS_INPUT_HISTORY_SIZE + 1,
115 .buf = msgbuf1,
116 },
117 };
118
119 if (!*ppos) {
120 mutex_lock(&psu->input_history.update_lock);
121 if (time_after(jiffies, psu->input_history.last_update + HZ)) {
122
123
124
125
126 rc = i2c_transfer(psu->client->adapter, msg, 2);
127 if (rc < 0) {
128 mutex_unlock(&psu->input_history.update_lock);
129 return rc;
130 }
131
132 psu->input_history.byte_count = msgbuf1[0];
133 memcpy(psu->input_history.data, &msgbuf1[1],
134 CFFPS_INPUT_HISTORY_SIZE);
135 psu->input_history.last_update = jiffies;
136 }
137
138 mutex_unlock(&psu->input_history.update_lock);
139 }
140
141 return simple_read_from_buffer(buf, count, ppos,
142 psu->input_history.data,
143 psu->input_history.byte_count);
144}
145
146static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,
147 size_t count, loff_t *ppos)
148{
149 u8 cmd;
150 int i, rc;
151 int *idxp = file->private_data;
152 int idx = *idxp;
153 struct ibm_cffps *psu = to_psu(idxp, idx);
154 char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
155
156 pmbus_set_page(psu->client, 0, 0xff);
157
158 switch (idx) {
159 case CFFPS_DEBUGFS_INPUT_HISTORY:
160 return ibm_cffps_read_input_history(psu, buf, count, ppos);
161 case CFFPS_DEBUGFS_FRU:
162 cmd = CFFPS_FRU_CMD;
163 break;
164 case CFFPS_DEBUGFS_PN:
165 cmd = CFFPS_PN_CMD;
166 break;
167 case CFFPS_DEBUGFS_HEADER:
168 cmd = CFFPS_HEADER_CMD;
169 break;
170 case CFFPS_DEBUGFS_SN:
171 cmd = CFFPS_SN_CMD;
172 break;
173 case CFFPS_DEBUGFS_MAX_POWER_OUT:
174 if (psu->version == cffps1) {
175 rc = i2c_smbus_read_word_swapped(psu->client,
176 CFFPS_MAX_POWER_OUT_CMD);
177 } else {
178 rc = i2c_smbus_read_word_data(psu->client,
179 CFFPS_MAX_POWER_OUT_CMD);
180 }
181
182 if (rc < 0)
183 return rc;
184
185 rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);
186 goto done;
187 case CFFPS_DEBUGFS_CCIN:
188 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);
189 if (rc < 0)
190 return rc;
191
192 rc = snprintf(data, 5, "%04X", rc);
193 goto done;
194 case CFFPS_DEBUGFS_FW:
195 switch (psu->version) {
196 case cffps1:
197 for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {
198 rc = i2c_smbus_read_byte_data(psu->client,
199 CFFPS_FW_CMD +
200 i);
201 if (rc < 0)
202 return rc;
203
204 snprintf(&data[i * 2], 3, "%02X", rc);
205 }
206
207 rc = i * 2;
208 break;
209 case cffps2:
210 for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {
211 rc = i2c_smbus_read_word_data(psu->client,
212 CFFPS_FW_CMD +
213 i);
214 if (rc < 0)
215 return rc;
216
217 snprintf(&data[i * 4], 5, "%04X", rc);
218 }
219
220 rc = i * 4;
221 break;
222 default:
223 return -EOPNOTSUPP;
224 }
225 goto done;
226 case CFFPS_DEBUGFS_ON_OFF_CONFIG:
227 rc = i2c_smbus_read_byte_data(psu->client,
228 PMBUS_ON_OFF_CONFIG);
229 if (rc < 0)
230 return rc;
231
232 rc = snprintf(data, 3, "%02x", rc);
233 goto done;
234 default:
235 return -EINVAL;
236 }
237
238 rc = i2c_smbus_read_block_data(psu->client, cmd, data);
239 if (rc < 0)
240 return rc;
241
242done:
243 data[rc] = '\n';
244 rc += 2;
245
246 return simple_read_from_buffer(buf, count, ppos, data, rc);
247}
248
249static ssize_t ibm_cffps_debugfs_write(struct file *file,
250 const char __user *buf, size_t count,
251 loff_t *ppos)
252{
253 u8 data;
254 ssize_t rc;
255 int *idxp = file->private_data;
256 int idx = *idxp;
257 struct ibm_cffps *psu = to_psu(idxp, idx);
258
259 switch (idx) {
260 case CFFPS_DEBUGFS_ON_OFF_CONFIG:
261 pmbus_set_page(psu->client, 0, 0xff);
262
263 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
264 if (rc <= 0)
265 return rc;
266
267 rc = i2c_smbus_write_byte_data(psu->client,
268 PMBUS_ON_OFF_CONFIG, data);
269 if (rc)
270 return rc;
271
272 rc = 1;
273 break;
274 default:
275 return -EINVAL;
276 }
277
278 return rc;
279}
280
281static const struct file_operations ibm_cffps_fops = {
282 .llseek = noop_llseek,
283 .read = ibm_cffps_debugfs_read,
284 .write = ibm_cffps_debugfs_write,
285 .open = simple_open,
286};
287
288static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,
289 int reg)
290{
291 int rc, mfr;
292
293 switch (reg) {
294 case PMBUS_STATUS_VOUT:
295 case PMBUS_STATUS_IOUT:
296 case PMBUS_STATUS_TEMPERATURE:
297 case PMBUS_STATUS_FAN_12:
298 rc = pmbus_read_byte_data(client, page, reg);
299 if (rc < 0)
300 return rc;
301
302 mfr = pmbus_read_byte_data(client, page,
303 PMBUS_STATUS_MFR_SPECIFIC);
304 if (mfr < 0)
305
306
307
308
309 return rc;
310
311
312 if (reg == PMBUS_STATUS_FAN_12) {
313 if (mfr & CFFPS_MFR_FAN_FAULT)
314 rc |= PB_FAN_FAN1_FAULT;
315 } else if (reg == PMBUS_STATUS_TEMPERATURE) {
316 if (mfr & CFFPS_MFR_THERMAL_FAULT)
317 rc |= PB_TEMP_OT_FAULT;
318 } else if (reg == PMBUS_STATUS_VOUT) {
319 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))
320 rc |= PB_VOLTAGE_OV_FAULT;
321 if (mfr & CFFPS_MFR_UV_FAULT)
322 rc |= PB_VOLTAGE_UV_FAULT;
323 } else if (reg == PMBUS_STATUS_IOUT) {
324 if (mfr & CFFPS_MFR_OC_FAULT)
325 rc |= PB_IOUT_OC_FAULT;
326 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)
327 rc |= PB_CURRENT_SHARE_FAULT;
328 }
329 break;
330 default:
331 rc = -ENODATA;
332 break;
333 }
334
335 return rc;
336}
337
338static int ibm_cffps_read_word_data(struct i2c_client *client, int page,
339 int phase, int reg)
340{
341 int rc, mfr;
342
343 switch (reg) {
344 case PMBUS_STATUS_WORD:
345 rc = pmbus_read_word_data(client, page, phase, reg);
346 if (rc < 0)
347 return rc;
348
349 mfr = pmbus_read_byte_data(client, page,
350 PMBUS_STATUS_MFR_SPECIFIC);
351 if (mfr < 0)
352
353
354
355
356 return rc;
357
358 if (mfr & CFFPS_MFR_PS_KILL)
359 rc |= PB_STATUS_OFF;
360 break;
361 case PMBUS_VIRT_READ_VMON:
362 rc = pmbus_read_word_data(client, page, phase,
363 CFFPS_12VCS_VOUT_CMD);
364 break;
365 default:
366 rc = -ENODATA;
367 break;
368 }
369
370 return rc;
371}
372
373static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
374 enum led_brightness brightness)
375{
376 int rc;
377 u8 next_led_state;
378 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
379
380 if (brightness == LED_OFF) {
381 next_led_state = CFFPS_LED_OFF;
382 } else {
383 brightness = LED_FULL;
384
385 if (psu->led_state != CFFPS_LED_BLINK)
386 next_led_state = CFFPS_LED_ON;
387 else
388 next_led_state = CFFPS_LED_BLINK;
389 }
390
391 dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
392 brightness, next_led_state);
393
394 pmbus_set_page(psu->client, 0, 0xff);
395
396 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
397 next_led_state);
398 if (rc < 0)
399 return rc;
400
401 psu->led_state = next_led_state;
402 led_cdev->brightness = brightness;
403
404 return 0;
405}
406
407static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
408 unsigned long *delay_on,
409 unsigned long *delay_off)
410{
411 int rc;
412 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
413
414 dev_dbg(&psu->client->dev, "LED blink set.\n");
415
416 pmbus_set_page(psu->client, 0, 0xff);
417
418 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
419 CFFPS_LED_BLINK);
420 if (rc < 0)
421 return rc;
422
423 psu->led_state = CFFPS_LED_BLINK;
424 led_cdev->brightness = LED_FULL;
425 *delay_on = CFFPS_BLINK_RATE_MS;
426 *delay_off = CFFPS_BLINK_RATE_MS;
427
428 return 0;
429}
430
431static void ibm_cffps_create_led_class(struct ibm_cffps *psu)
432{
433 int rc;
434 struct i2c_client *client = psu->client;
435 struct device *dev = &client->dev;
436
437 snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name,
438 client->addr);
439 psu->led.name = psu->led_name;
440 psu->led.max_brightness = LED_FULL;
441 psu->led.brightness_set_blocking = ibm_cffps_led_brightness_set;
442 psu->led.blink_set = ibm_cffps_led_blink_set;
443
444 rc = devm_led_classdev_register(dev, &psu->led);
445 if (rc)
446 dev_warn(dev, "failed to register led class: %d\n", rc);
447 else
448 i2c_smbus_write_byte_data(client, CFFPS_SYS_CONFIG_CMD,
449 CFFPS_LED_OFF);
450}
451
452static struct pmbus_driver_info ibm_cffps_info[] = {
453 [cffps1] = {
454 .pages = 1,
455 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
456 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
457 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
458 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
459 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
460 PMBUS_HAVE_STATUS_FAN12,
461 .read_byte_data = ibm_cffps_read_byte_data,
462 .read_word_data = ibm_cffps_read_word_data,
463 },
464 [cffps2] = {
465 .pages = 2,
466 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
467 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP |
468 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
469 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
470 PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
471 PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_VMON,
472 .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
473 PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
474 PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT,
475 .read_byte_data = ibm_cffps_read_byte_data,
476 .read_word_data = ibm_cffps_read_word_data,
477 },
478};
479
480static struct pmbus_platform_data ibm_cffps_pdata = {
481 .flags = PMBUS_SKIP_STATUS_CHECK | PMBUS_NO_CAPABILITY,
482};
483
484static int ibm_cffps_probe(struct i2c_client *client)
485{
486 int i, rc;
487 enum versions vs = cffps_unknown;
488 struct dentry *debugfs;
489 struct dentry *ibm_cffps_dir;
490 struct ibm_cffps *psu;
491 const void *md = of_device_get_match_data(&client->dev);
492 const struct i2c_device_id *id;
493
494 if (md) {
495 vs = (enum versions)md;
496 } else {
497 id = i2c_match_id(ibm_cffps_id, client);
498 if (id)
499 vs = (enum versions)id->driver_data;
500 }
501
502 if (vs == cffps_unknown) {
503 u16 ccin_revision = 0;
504 u16 ccin_version = CFFPS_CCIN_VERSION_1;
505 int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);
506
507 if (ccin > 0) {
508 ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);
509 ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);
510 }
511
512 switch (ccin_version) {
513 default:
514 case CFFPS_CCIN_VERSION_1:
515 vs = cffps1;
516 break;
517 case CFFPS_CCIN_VERSION_2:
518 vs = cffps2;
519 break;
520 case CFFPS_CCIN_VERSION_3:
521 if (ccin_revision == CFFPS_CCIN_REVISION_LEGACY)
522 vs = cffps1;
523 else
524 vs = cffps2;
525 break;
526 }
527
528
529 snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);
530 }
531
532 client->dev.platform_data = &ibm_cffps_pdata;
533 rc = pmbus_do_probe(client, &ibm_cffps_info[vs]);
534 if (rc)
535 return rc;
536
537
538
539
540
541 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);
542 if (!psu)
543 return 0;
544
545 psu->version = vs;
546 psu->client = client;
547 mutex_init(&psu->input_history.update_lock);
548 psu->input_history.last_update = jiffies - HZ;
549
550 ibm_cffps_create_led_class(psu);
551
552
553 debugfs = pmbus_get_debugfs_dir(client);
554 if (!debugfs)
555 return 0;
556
557 ibm_cffps_dir = debugfs_create_dir(client->name, debugfs);
558 if (!ibm_cffps_dir)
559 return 0;
560
561 for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)
562 psu->debugfs_entries[i] = i;
563
564 debugfs_create_file("input_history", 0444, ibm_cffps_dir,
565 &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY],
566 &ibm_cffps_fops);
567 debugfs_create_file("fru", 0444, ibm_cffps_dir,
568 &psu->debugfs_entries[CFFPS_DEBUGFS_FRU],
569 &ibm_cffps_fops);
570 debugfs_create_file("part_number", 0444, ibm_cffps_dir,
571 &psu->debugfs_entries[CFFPS_DEBUGFS_PN],
572 &ibm_cffps_fops);
573 debugfs_create_file("header", 0444, ibm_cffps_dir,
574 &psu->debugfs_entries[CFFPS_DEBUGFS_HEADER],
575 &ibm_cffps_fops);
576 debugfs_create_file("serial_number", 0444, ibm_cffps_dir,
577 &psu->debugfs_entries[CFFPS_DEBUGFS_SN],
578 &ibm_cffps_fops);
579 debugfs_create_file("max_power_out", 0444, ibm_cffps_dir,
580 &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],
581 &ibm_cffps_fops);
582 debugfs_create_file("ccin", 0444, ibm_cffps_dir,
583 &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],
584 &ibm_cffps_fops);
585 debugfs_create_file("fw_version", 0444, ibm_cffps_dir,
586 &psu->debugfs_entries[CFFPS_DEBUGFS_FW],
587 &ibm_cffps_fops);
588 debugfs_create_file("on_off_config", 0644, ibm_cffps_dir,
589 &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],
590 &ibm_cffps_fops);
591
592 return 0;
593}
594
595static const struct i2c_device_id ibm_cffps_id[] = {
596 { "ibm_cffps1", cffps1 },
597 { "ibm_cffps2", cffps2 },
598 { "ibm_cffps", cffps_unknown },
599 {}
600};
601MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);
602
603static const struct of_device_id ibm_cffps_of_match[] = {
604 {
605 .compatible = "ibm,cffps1",
606 .data = (void *)cffps1
607 },
608 {
609 .compatible = "ibm,cffps2",
610 .data = (void *)cffps2
611 },
612 {
613 .compatible = "ibm,cffps",
614 .data = (void *)cffps_unknown
615 },
616 {}
617};
618MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);
619
620static struct i2c_driver ibm_cffps_driver = {
621 .driver = {
622 .name = "ibm-cffps",
623 .of_match_table = ibm_cffps_of_match,
624 },
625 .probe_new = ibm_cffps_probe,
626 .id_table = ibm_cffps_id,
627};
628
629module_i2c_driver(ibm_cffps_driver);
630
631MODULE_AUTHOR("Eddie James");
632MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");
633MODULE_LICENSE("GPL");
634MODULE_IMPORT_NS(PMBUS);
635
