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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2017 IBM Corp.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.h>17#include <linux/pmbus.h>18 19#include "pmbus.h"20 21#define CFFPS_CCIN_CMD 0xBD22#define CFFPS_FW_CMD 0xFA23#define CFFPS1_FW_NUM_BYTES 424#define CFFPS2_FW_NUM_WORDS 325#define CFFPS_SYS_CONFIG_CMD 0xDA26#define CFFPS_12VCS_VOUT_CMD 0xDE27 28#define CFFPS_INPUT_HISTORY_CMD 0xD629#define CFFPS_INPUT_HISTORY_SIZE 10130 31#define CFFPS_CCIN_REVISION GENMASK(7, 0)32#define CFFPS_CCIN_REVISION_LEGACY 0xde33#define CFFPS_CCIN_VERSION GENMASK(15, 8)34#define CFFPS_CCIN_VERSION_1 0x2b35#define CFFPS_CCIN_VERSION_2 0x2e36#define CFFPS_CCIN_VERSION_3 0x5137 38/* STATUS_MFR_SPECIFIC bits */39#define CFFPS_MFR_FAN_FAULT BIT(0)40#define CFFPS_MFR_THERMAL_FAULT BIT(1)41#define CFFPS_MFR_OV_FAULT BIT(2)42#define CFFPS_MFR_UV_FAULT BIT(3)43#define CFFPS_MFR_PS_KILL BIT(4)44#define CFFPS_MFR_OC_FAULT BIT(5)45#define CFFPS_MFR_VAUX_FAULT BIT(6)46#define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7)47 48#define CFFPS_LED_BLINK (BIT(0) | BIT(6))49#define CFFPS_LED_ON (BIT(1) | BIT(6))50#define CFFPS_LED_OFF (BIT(2) | BIT(6))51#define CFFPS_BLINK_RATE_MS 25052 53enum {54 CFFPS_DEBUGFS_MAX_POWER_OUT = 0,55 CFFPS_DEBUGFS_CCIN,56 CFFPS_DEBUGFS_FW,57 CFFPS_DEBUGFS_ON_OFF_CONFIG,58 CFFPS_DEBUGFS_NUM_ENTRIES59};60 61enum versions { cffps1, cffps2, cffps_unknown };62 63struct ibm_cffps {64 enum versions version;65 struct i2c_client *client;66 67 u8 input_history[CFFPS_INPUT_HISTORY_SIZE];68 69 int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES];70 71 char led_name[32];72 u8 led_state;73 struct led_classdev led;74};75 76#define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)])77 78static ssize_t ibm_cffps_debugfs_read_input_history(struct file *file, char __user *buf,79 size_t count, loff_t *ppos)80{81 int rc;82 u8 cmd = CFFPS_INPUT_HISTORY_CMD;83 struct ibm_cffps *psu = file->private_data;84 struct i2c_msg msg[2] = {85 {86 .addr = psu->client->addr,87 .flags = psu->client->flags,88 .len = 1,89 .buf = &cmd,90 }, {91 .addr = psu->client->addr,92 .flags = psu->client->flags | I2C_M_RD,93 .len = CFFPS_INPUT_HISTORY_SIZE,94 .buf = psu->input_history,95 },96 };97 98 if (!*ppos) {99 rc = pmbus_lock_interruptible(psu->client);100 if (rc)101 return rc;102 103 rc = pmbus_set_page(psu->client, 0, 0xff);104 if (rc) {105 pmbus_unlock(psu->client);106 return rc;107 }108 109 /*110 * Use a raw i2c transfer, since we need more bytes111 * than Linux I2C supports through smbus xfr (only 32).112 */113 rc = i2c_transfer(psu->client->adapter, msg, 2);114 pmbus_unlock(psu->client);115 if (rc < 0)116 return rc;117 }118 119 return simple_read_from_buffer(buf, count, ppos,120 psu->input_history + 1,121 psu->input_history[0]);122}123 124static const struct file_operations ibm_cffps_input_history_fops = {125 .llseek = noop_llseek,126 .read = ibm_cffps_debugfs_read_input_history,127 .open = simple_open,128};129 130static ssize_t ibm_cffps_debugfs_read(struct file *file, char __user *buf,131 size_t count, loff_t *ppos)132{133 int i, rc;134 int *idxp = file->private_data;135 int idx = *idxp;136 struct ibm_cffps *psu = to_psu(idxp, idx);137 char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };138 139 rc = pmbus_lock_interruptible(psu->client);140 if (rc)141 return rc;142 143 rc = pmbus_set_page(psu->client, 0, 0xff);144 if (rc)145 goto unlock;146 147 switch (idx) {148 case CFFPS_DEBUGFS_MAX_POWER_OUT:149 if (psu->version == cffps1)150 rc = i2c_smbus_read_word_swapped(psu->client, PMBUS_MFR_POUT_MAX);151 else152 rc = i2c_smbus_read_word_data(psu->client, PMBUS_MFR_POUT_MAX);153 if (rc >= 0)154 rc = snprintf(data, I2C_SMBUS_BLOCK_MAX, "%d", rc);155 break;156 case CFFPS_DEBUGFS_CCIN:157 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD);158 if (rc >= 0)159 rc = snprintf(data, 5, "%04X", rc);160 break;161 case CFFPS_DEBUGFS_FW:162 switch (psu->version) {163 case cffps1:164 for (i = 0; i < CFFPS1_FW_NUM_BYTES; ++i) {165 rc = i2c_smbus_read_byte_data(psu->client, CFFPS_FW_CMD + i);166 if (rc < 0)167 goto unlock;168 169 snprintf(&data[i * 2], 3, "%02X", rc);170 }171 172 rc = i * 2;173 break;174 case cffps2:175 for (i = 0; i < CFFPS2_FW_NUM_WORDS; ++i) {176 rc = i2c_smbus_read_word_data(psu->client, CFFPS_FW_CMD + i);177 if (rc < 0)178 goto unlock;179 180 snprintf(&data[i * 4], 5, "%04X", rc);181 }182 183 rc = i * 4;184 break;185 default:186 rc = -EOPNOTSUPP;187 break;188 }189 break;190 case CFFPS_DEBUGFS_ON_OFF_CONFIG:191 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_ON_OFF_CONFIG);192 if (rc >= 0)193 rc = snprintf(data, 3, "%02x", rc);194 break;195 default:196 rc = -EINVAL;197 break;198 }199 200unlock:201 pmbus_unlock(psu->client);202 if (rc < 0)203 return rc;204 205 data[rc] = '\n';206 rc += 2;207 208 return simple_read_from_buffer(buf, count, ppos, data, rc);209}210 211static ssize_t ibm_cffps_debugfs_write(struct file *file,212 const char __user *buf, size_t count,213 loff_t *ppos)214{215 u8 data;216 ssize_t rc;217 int *idxp = file->private_data;218 int idx = *idxp;219 struct ibm_cffps *psu = to_psu(idxp, idx);220 221 switch (idx) {222 case CFFPS_DEBUGFS_ON_OFF_CONFIG:223 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);224 if (rc <= 0)225 return rc;226 227 rc = pmbus_lock_interruptible(psu->client);228 if (rc)229 return rc;230 231 rc = pmbus_set_page(psu->client, 0, 0xff);232 if (rc) {233 pmbus_unlock(psu->client);234 return rc;235 }236 237 rc = i2c_smbus_write_byte_data(psu->client, PMBUS_ON_OFF_CONFIG, data);238 pmbus_unlock(psu->client);239 if (rc)240 return rc;241 242 rc = 1;243 break;244 default:245 return -EINVAL;246 }247 248 return rc;249}250 251static const struct file_operations ibm_cffps_fops = {252 .llseek = noop_llseek,253 .read = ibm_cffps_debugfs_read,254 .write = ibm_cffps_debugfs_write,255 .open = simple_open,256};257 258static int ibm_cffps_read_byte_data(struct i2c_client *client, int page,259 int reg)260{261 int rc, mfr;262 263 switch (reg) {264 case PMBUS_STATUS_VOUT:265 case PMBUS_STATUS_IOUT:266 case PMBUS_STATUS_TEMPERATURE:267 case PMBUS_STATUS_FAN_12:268 rc = pmbus_read_byte_data(client, page, reg);269 if (rc < 0)270 return rc;271 272 mfr = pmbus_read_byte_data(client, page,273 PMBUS_STATUS_MFR_SPECIFIC);274 if (mfr < 0)275 /*276 * Return the status register instead of an error,277 * since we successfully read status.278 */279 return rc;280 281 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */282 if (reg == PMBUS_STATUS_FAN_12) {283 if (mfr & CFFPS_MFR_FAN_FAULT)284 rc |= PB_FAN_FAN1_FAULT;285 } else if (reg == PMBUS_STATUS_TEMPERATURE) {286 if (mfr & CFFPS_MFR_THERMAL_FAULT)287 rc |= PB_TEMP_OT_FAULT;288 } else if (reg == PMBUS_STATUS_VOUT) {289 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT))290 rc |= PB_VOLTAGE_OV_FAULT;291 if (mfr & CFFPS_MFR_UV_FAULT)292 rc |= PB_VOLTAGE_UV_FAULT;293 } else if (reg == PMBUS_STATUS_IOUT) {294 if (mfr & CFFPS_MFR_OC_FAULT)295 rc |= PB_IOUT_OC_FAULT;296 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING)297 rc |= PB_CURRENT_SHARE_FAULT;298 }299 break;300 default:301 rc = -ENODATA;302 break;303 }304 305 return rc;306}307 308static int ibm_cffps_read_word_data(struct i2c_client *client, int page,309 int phase, int reg)310{311 int rc, mfr;312 313 switch (reg) {314 case PMBUS_STATUS_WORD:315 rc = pmbus_read_word_data(client, page, phase, reg);316 if (rc < 0)317 return rc;318 319 mfr = pmbus_read_byte_data(client, page,320 PMBUS_STATUS_MFR_SPECIFIC);321 if (mfr < 0)322 /*323 * Return the status register instead of an error,324 * since we successfully read status.325 */326 return rc;327 328 if (mfr & CFFPS_MFR_PS_KILL)329 rc |= PB_STATUS_OFF;330 break;331 case PMBUS_VIRT_READ_VMON:332 rc = pmbus_read_word_data(client, page, phase,333 CFFPS_12VCS_VOUT_CMD);334 break;335 default:336 rc = -ENODATA;337 break;338 }339 340 return rc;341}342 343static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,344 enum led_brightness brightness)345{346 int rc;347 u8 next_led_state;348 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);349 350 if (brightness == LED_OFF) {351 next_led_state = CFFPS_LED_OFF;352 } else {353 brightness = LED_FULL;354 355 if (psu->led_state != CFFPS_LED_BLINK)356 next_led_state = CFFPS_LED_ON;357 else358 next_led_state = CFFPS_LED_BLINK;359 }360 361 dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",362 brightness, next_led_state);363 364 rc = pmbus_lock_interruptible(psu->client);365 if (rc)366 return rc;367 368 rc = pmbus_set_page(psu->client, 0, 0xff);369 if (rc) {370 pmbus_unlock(psu->client);371 return rc;372 }373 374 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,375 next_led_state);376 pmbus_unlock(psu->client);377 if (rc < 0)378 return rc;379 380 psu->led_state = next_led_state;381 led_cdev->brightness = brightness;382 383 return 0;384}385 386static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,387 unsigned long *delay_on,388 unsigned long *delay_off)389{390 int rc;391 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);392 393 dev_dbg(&psu->client->dev, "LED blink set.\n");394 395 rc = pmbus_lock_interruptible(psu->client);396 if (rc)397 return rc;398 399 rc = pmbus_set_page(psu->client, 0, 0xff);400 if (rc) {401 pmbus_unlock(psu->client);402 return rc;403 }404 405 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,406 CFFPS_LED_BLINK);407 pmbus_unlock(psu->client);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 else436 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_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |461 PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |462 PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |463 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |464 PMBUS_HAVE_STATUS_TEMP,465 .read_byte_data = ibm_cffps_read_byte_data,466 .read_word_data = ibm_cffps_read_word_data,467 },468};469 470static struct pmbus_platform_data ibm_cffps_pdata = {471 .flags = PMBUS_SKIP_STATUS_CHECK | PMBUS_NO_CAPABILITY,472};473 474static const struct i2c_device_id ibm_cffps_id[] = {475 { "ibm_cffps1", cffps1 },476 { "ibm_cffps2", cffps2 },477 { "ibm_cffps", cffps_unknown },478 {}479};480MODULE_DEVICE_TABLE(i2c, ibm_cffps_id);481 482static int ibm_cffps_probe(struct i2c_client *client)483{484 int i, rc;485 enum versions vs = cffps_unknown;486 struct dentry *debugfs;487 struct ibm_cffps *psu;488 const void *md = of_device_get_match_data(&client->dev);489 const struct i2c_device_id *id;490 491 if (md) {492 vs = (uintptr_t)md;493 } else {494 id = i2c_match_id(ibm_cffps_id, client);495 if (id)496 vs = (enum versions)id->driver_data;497 }498 499 if (vs == cffps_unknown) {500 u16 ccin_revision = 0;501 u16 ccin_version = CFFPS_CCIN_VERSION_1;502 int ccin = i2c_smbus_read_word_swapped(client, CFFPS_CCIN_CMD);503 char mfg_id[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };504 505 if (ccin > 0) {506 ccin_revision = FIELD_GET(CFFPS_CCIN_REVISION, ccin);507 ccin_version = FIELD_GET(CFFPS_CCIN_VERSION, ccin);508 }509 510 rc = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, mfg_id);511 if (rc < 0) {512 dev_err(&client->dev, "Failed to read Manufacturer ID\n");513 return rc;514 }515 516 switch (ccin_version) {517 default:518 case CFFPS_CCIN_VERSION_1:519 if ((strncmp(mfg_id, "ACBE", 4) == 0) ||520 (strncmp(mfg_id, "ARTE", 4) == 0))521 vs = cffps1;522 else523 vs = cffps2;524 break;525 case CFFPS_CCIN_VERSION_2:526 vs = cffps2;527 break;528 case CFFPS_CCIN_VERSION_3:529 if (ccin_revision == CFFPS_CCIN_REVISION_LEGACY)530 vs = cffps1;531 else532 vs = cffps2;533 break;534 }535 536 /* Set the client name to include the version number. */537 snprintf(client->name, I2C_NAME_SIZE, "cffps%d", vs + 1);538 }539 540 client->dev.platform_data = &ibm_cffps_pdata;541 rc = pmbus_do_probe(client, &ibm_cffps_info[vs]);542 if (rc)543 return rc;544 545 /*546 * Don't fail the probe if there isn't enough memory for leds and547 * debugfs.548 */549 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL);550 if (!psu)551 return 0;552 553 psu->version = vs;554 psu->client = client;555 556 ibm_cffps_create_led_class(psu);557 558 /* Don't fail the probe if we can't create debugfs */559 debugfs = pmbus_get_debugfs_dir(client);560 if (!debugfs)561 return 0;562 563 for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i)564 psu->debugfs_entries[i] = i;565 566 debugfs_create_file("input_history", 0444, debugfs, psu, &ibm_cffps_input_history_fops);567 debugfs_create_file("max_power_out", 0444, debugfs,568 &psu->debugfs_entries[CFFPS_DEBUGFS_MAX_POWER_OUT],569 &ibm_cffps_fops);570 debugfs_create_file("ccin", 0444, debugfs,571 &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN],572 &ibm_cffps_fops);573 debugfs_create_file("fw_version", 0444, debugfs,574 &psu->debugfs_entries[CFFPS_DEBUGFS_FW],575 &ibm_cffps_fops);576 debugfs_create_file("on_off_config", 0644, debugfs,577 &psu->debugfs_entries[CFFPS_DEBUGFS_ON_OFF_CONFIG],578 &ibm_cffps_fops);579 580 /* For compatibility with users of the old naming scheme. */581 debugfs_create_symlink(client->name, debugfs, ".");582 583 return 0;584}585 586static const struct of_device_id ibm_cffps_of_match[] = {587 {588 .compatible = "ibm,cffps1",589 .data = (void *)cffps1590 },591 {592 .compatible = "ibm,cffps2",593 .data = (void *)cffps2594 },595 {596 .compatible = "ibm,cffps",597 .data = (void *)cffps_unknown598 },599 {}600};601MODULE_DEVICE_TABLE(of, ibm_cffps_of_match);602 603static struct i2c_driver ibm_cffps_driver = {604 .driver = {605 .name = "ibm-cffps",606 .of_match_table = ibm_cffps_of_match,607 },608 .probe = ibm_cffps_probe,609 .id_table = ibm_cffps_id,610};611 612module_i2c_driver(ibm_cffps_driver);613 614MODULE_AUTHOR("Eddie James");615MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies");616MODULE_LICENSE("GPL");617MODULE_IMPORT_NS(PMBUS);618