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