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