1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Delta modules, Q54SJ108A2 series 1/4 Brick DC/DC 4 * Regulated Power Module 5 * 6 * Copyright 2020 Delta LLC. 7 */ 8 9 #include <linux/debugfs.h> 10 #include <linux/i2c.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include "pmbus.h" 14 15 #define STORE_DEFAULT_ALL 0x11 16 #define ERASE_BLACKBOX_DATA 0xD1 17 #define READ_HISTORY_EVENT_NUMBER 0xD2 18 #define READ_HISTORY_EVENTS 0xE0 19 #define SET_HISTORY_EVENT_OFFSET 0xE1 20 #define PMBUS_FLASH_KEY_WRITE 0xEC 21 22 enum chips { 23 q54sj108a2 24 }; 25 26 enum { 27 Q54SJ108A2_DEBUGFS_OPERATION = 0, 28 Q54SJ108A2_DEBUGFS_CLEARFAULT, 29 Q54SJ108A2_DEBUGFS_WRITEPROTECT, 30 Q54SJ108A2_DEBUGFS_STOREDEFAULT, 31 Q54SJ108A2_DEBUGFS_VOOV_RESPONSE, 32 Q54SJ108A2_DEBUGFS_IOOC_RESPONSE, 33 Q54SJ108A2_DEBUGFS_PMBUS_VERSION, 34 Q54SJ108A2_DEBUGFS_MFR_ID, 35 Q54SJ108A2_DEBUGFS_MFR_MODEL, 36 Q54SJ108A2_DEBUGFS_MFR_REVISION, 37 Q54SJ108A2_DEBUGFS_MFR_LOCATION, 38 Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE, 39 Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET, 40 Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET, 41 Q54SJ108A2_DEBUGFS_BLACKBOX_READ, 42 Q54SJ108A2_DEBUGFS_FLASH_KEY, 43 Q54SJ108A2_DEBUGFS_NUM_ENTRIES 44 }; 45 46 struct q54sj108a2_data { 47 enum chips chip; 48 struct i2c_client *client; 49 50 int debugfs_entries[Q54SJ108A2_DEBUGFS_NUM_ENTRIES]; 51 }; 52 53 #define to_psu(x, y) container_of((x), struct q54sj108a2_data, debugfs_entries[(y)]) 54 55 static struct pmbus_driver_info q54sj108a2_info[] = { 56 [q54sj108a2] = { 57 .pages = 1, 58 59 /* Source : Delta Q54SJ108A2 */ 60 .format[PSC_TEMPERATURE] = linear, 61 .format[PSC_VOLTAGE_IN] = linear, 62 .format[PSC_CURRENT_OUT] = linear, 63 64 .func[0] = PMBUS_HAVE_VIN | 65 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | 66 PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | 67 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | 68 PMBUS_HAVE_STATUS_INPUT, 69 }, 70 }; 71 72 static ssize_t q54sj108a2_debugfs_read(struct file *file, char __user *buf, 73 size_t count, loff_t *ppos) 74 { 75 int rc; 76 int *idxp = file->private_data; 77 int idx = *idxp; 78 struct q54sj108a2_data *psu = to_psu(idxp, idx); 79 char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; 80 char data_char[I2C_SMBUS_BLOCK_MAX + 2] = { 0 }; 81 char *res; 82 83 switch (idx) { 84 case Q54SJ108A2_DEBUGFS_OPERATION: 85 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_OPERATION); 86 if (rc < 0) 87 return rc; 88 89 rc = snprintf(data, 3, "%02x", rc); 90 break; 91 case Q54SJ108A2_DEBUGFS_WRITEPROTECT: 92 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_WRITE_PROTECT); 93 if (rc < 0) 94 return rc; 95 96 rc = snprintf(data, 3, "%02x", rc); 97 break; 98 case Q54SJ108A2_DEBUGFS_VOOV_RESPONSE: 99 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_VOUT_OV_FAULT_RESPONSE); 100 if (rc < 0) 101 return rc; 102 103 rc = snprintf(data, 3, "%02x", rc); 104 break; 105 case Q54SJ108A2_DEBUGFS_IOOC_RESPONSE: 106 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_IOUT_OC_FAULT_RESPONSE); 107 if (rc < 0) 108 return rc; 109 110 rc = snprintf(data, 3, "%02x", rc); 111 break; 112 case Q54SJ108A2_DEBUGFS_PMBUS_VERSION: 113 rc = i2c_smbus_read_byte_data(psu->client, PMBUS_REVISION); 114 if (rc < 0) 115 return rc; 116 117 rc = snprintf(data, 3, "%02x", rc); 118 break; 119 case Q54SJ108A2_DEBUGFS_MFR_ID: 120 rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_ID, data); 121 if (rc < 0) 122 return rc; 123 break; 124 case Q54SJ108A2_DEBUGFS_MFR_MODEL: 125 rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_MODEL, data); 126 if (rc < 0) 127 return rc; 128 break; 129 case Q54SJ108A2_DEBUGFS_MFR_REVISION: 130 rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_REVISION, data); 131 if (rc < 0) 132 return rc; 133 break; 134 case Q54SJ108A2_DEBUGFS_MFR_LOCATION: 135 rc = i2c_smbus_read_block_data(psu->client, PMBUS_MFR_LOCATION, data); 136 if (rc < 0) 137 return rc; 138 break; 139 case Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET: 140 rc = i2c_smbus_read_byte_data(psu->client, READ_HISTORY_EVENT_NUMBER); 141 if (rc < 0) 142 return rc; 143 144 rc = snprintf(data, 3, "%02x", rc); 145 break; 146 case Q54SJ108A2_DEBUGFS_BLACKBOX_READ: 147 rc = i2c_smbus_read_block_data(psu->client, READ_HISTORY_EVENTS, data); 148 if (rc < 0) 149 return rc; 150 151 res = bin2hex(data, data_char, 32); 152 rc = res - data; 153 154 break; 155 case Q54SJ108A2_DEBUGFS_FLASH_KEY: 156 rc = i2c_smbus_read_block_data(psu->client, PMBUS_FLASH_KEY_WRITE, data); 157 if (rc < 0) 158 return rc; 159 160 res = bin2hex(data, data_char, 4); 161 rc = res - data; 162 163 break; 164 default: 165 return -EINVAL; 166 } 167 168 data[rc] = '\n'; 169 rc += 2; 170 171 return simple_read_from_buffer(buf, count, ppos, data, rc); 172 } 173 174 static ssize_t q54sj108a2_debugfs_write(struct file *file, const char __user *buf, 175 size_t count, loff_t *ppos) 176 { 177 u8 flash_key[4]; 178 u8 dst_data; 179 ssize_t rc; 180 int *idxp = file->private_data; 181 int idx = *idxp; 182 struct q54sj108a2_data *psu = to_psu(idxp, idx); 183 184 rc = i2c_smbus_write_byte_data(psu->client, PMBUS_WRITE_PROTECT, 0); 185 if (rc) 186 return rc; 187 188 switch (idx) { 189 case Q54SJ108A2_DEBUGFS_OPERATION: 190 rc = kstrtou8_from_user(buf, count, 0, &dst_data); 191 if (rc < 0) 192 return rc; 193 194 rc = i2c_smbus_write_byte_data(psu->client, PMBUS_OPERATION, dst_data); 195 if (rc < 0) 196 return rc; 197 198 break; 199 case Q54SJ108A2_DEBUGFS_CLEARFAULT: 200 rc = i2c_smbus_write_byte(psu->client, PMBUS_CLEAR_FAULTS); 201 if (rc < 0) 202 return rc; 203 204 break; 205 case Q54SJ108A2_DEBUGFS_STOREDEFAULT: 206 flash_key[0] = 0x7E; 207 flash_key[1] = 0x15; 208 flash_key[2] = 0xDC; 209 flash_key[3] = 0x42; 210 rc = i2c_smbus_write_block_data(psu->client, PMBUS_FLASH_KEY_WRITE, 4, flash_key); 211 if (rc < 0) 212 return rc; 213 214 rc = i2c_smbus_write_byte(psu->client, STORE_DEFAULT_ALL); 215 if (rc < 0) 216 return rc; 217 218 break; 219 case Q54SJ108A2_DEBUGFS_VOOV_RESPONSE: 220 rc = kstrtou8_from_user(buf, count, 0, &dst_data); 221 if (rc < 0) 222 return rc; 223 224 rc = i2c_smbus_write_byte_data(psu->client, PMBUS_VOUT_OV_FAULT_RESPONSE, dst_data); 225 if (rc < 0) 226 return rc; 227 228 break; 229 case Q54SJ108A2_DEBUGFS_IOOC_RESPONSE: 230 rc = kstrtou8_from_user(buf, count, 0, &dst_data); 231 if (rc < 0) 232 return rc; 233 234 rc = i2c_smbus_write_byte_data(psu->client, PMBUS_IOUT_OC_FAULT_RESPONSE, dst_data); 235 if (rc < 0) 236 return rc; 237 238 break; 239 case Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE: 240 rc = i2c_smbus_write_byte(psu->client, ERASE_BLACKBOX_DATA); 241 if (rc < 0) 242 return rc; 243 244 break; 245 case Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET: 246 rc = kstrtou8_from_user(buf, count, 0, &dst_data); 247 if (rc < 0) 248 return rc; 249 250 rc = i2c_smbus_write_byte_data(psu->client, SET_HISTORY_EVENT_OFFSET, dst_data); 251 if (rc < 0) 252 return rc; 253 254 break; 255 default: 256 return -EINVAL; 257 } 258 259 return count; 260 } 261 262 static const struct file_operations q54sj108a2_fops = { 263 .llseek = noop_llseek, 264 .read = q54sj108a2_debugfs_read, 265 .write = q54sj108a2_debugfs_write, 266 .open = simple_open, 267 }; 268 269 static const struct i2c_device_id q54sj108a2_id[] = { 270 { "q54sj108a2", q54sj108a2 }, 271 { }, 272 }; 273 274 MODULE_DEVICE_TABLE(i2c, q54sj108a2_id); 275 276 static int q54sj108a2_probe(struct i2c_client *client) 277 { 278 struct device *dev = &client->dev; 279 u8 buf[I2C_SMBUS_BLOCK_MAX + 1]; 280 enum chips chip_id; 281 int ret, i; 282 struct dentry *debugfs; 283 struct dentry *q54sj108a2_dir; 284 struct q54sj108a2_data *psu; 285 286 if (!i2c_check_functionality(client->adapter, 287 I2C_FUNC_SMBUS_BYTE_DATA | 288 I2C_FUNC_SMBUS_WORD_DATA | 289 I2C_FUNC_SMBUS_BLOCK_DATA)) 290 return -ENODEV; 291 292 if (client->dev.of_node) 293 chip_id = (enum chips)(unsigned long)of_device_get_match_data(dev); 294 else 295 chip_id = i2c_match_id(q54sj108a2_id, client)->driver_data; 296 297 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf); 298 if (ret < 0) { 299 dev_err(&client->dev, "Failed to read Manufacturer ID\n"); 300 return ret; 301 } 302 if (ret != 5 || strncmp(buf, "DELTA", 5)) { 303 buf[ret] = '\0'; 304 dev_err(dev, "Unsupported Manufacturer ID '%s'\n", buf); 305 return -ENODEV; 306 } 307 308 /* 309 * The chips support reading PMBUS_MFR_MODEL. 310 */ 311 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf); 312 if (ret < 0) { 313 dev_err(dev, "Failed to read Manufacturer Model\n"); 314 return ret; 315 } 316 if (ret != 14 || strncmp(buf, "Q54SJ108A2", 10)) { 317 buf[ret] = '\0'; 318 dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf); 319 return -ENODEV; 320 } 321 322 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_REVISION, buf); 323 if (ret < 0) { 324 dev_err(dev, "Failed to read Manufacturer Revision\n"); 325 return ret; 326 } 327 if (ret != 4 || buf[0] != 'S') { 328 buf[ret] = '\0'; 329 dev_err(dev, "Unsupported Manufacturer Revision '%s'\n", buf); 330 return -ENODEV; 331 } 332 333 ret = pmbus_do_probe(client, &q54sj108a2_info[chip_id]); 334 if (ret) 335 return ret; 336 337 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); 338 if (!psu) 339 return 0; 340 341 psu->client = client; 342 343 debugfs = pmbus_get_debugfs_dir(client); 344 345 q54sj108a2_dir = debugfs_create_dir(client->name, debugfs); 346 347 for (i = 0; i < Q54SJ108A2_DEBUGFS_NUM_ENTRIES; ++i) 348 psu->debugfs_entries[i] = i; 349 350 debugfs_create_file("operation", 0644, q54sj108a2_dir, 351 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_OPERATION], 352 &q54sj108a2_fops); 353 debugfs_create_file("clear_fault", 0200, q54sj108a2_dir, 354 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_CLEARFAULT], 355 &q54sj108a2_fops); 356 debugfs_create_file("write_protect", 0444, q54sj108a2_dir, 357 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_WRITEPROTECT], 358 &q54sj108a2_fops); 359 debugfs_create_file("store_default", 0200, q54sj108a2_dir, 360 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_STOREDEFAULT], 361 &q54sj108a2_fops); 362 debugfs_create_file("vo_ov_response", 0644, q54sj108a2_dir, 363 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_VOOV_RESPONSE], 364 &q54sj108a2_fops); 365 debugfs_create_file("io_oc_response", 0644, q54sj108a2_dir, 366 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_IOOC_RESPONSE], 367 &q54sj108a2_fops); 368 debugfs_create_file("pmbus_revision", 0444, q54sj108a2_dir, 369 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_PMBUS_VERSION], 370 &q54sj108a2_fops); 371 debugfs_create_file("mfr_id", 0444, q54sj108a2_dir, 372 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_ID], 373 &q54sj108a2_fops); 374 debugfs_create_file("mfr_model", 0444, q54sj108a2_dir, 375 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_MODEL], 376 &q54sj108a2_fops); 377 debugfs_create_file("mfr_revision", 0444, q54sj108a2_dir, 378 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_REVISION], 379 &q54sj108a2_fops); 380 debugfs_create_file("mfr_location", 0444, q54sj108a2_dir, 381 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_MFR_LOCATION], 382 &q54sj108a2_fops); 383 debugfs_create_file("blackbox_erase", 0200, q54sj108a2_dir, 384 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_ERASE], 385 &q54sj108a2_fops); 386 debugfs_create_file("blackbox_read_offset", 0444, q54sj108a2_dir, 387 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_READ_OFFSET], 388 &q54sj108a2_fops); 389 debugfs_create_file("blackbox_set_offset", 0200, q54sj108a2_dir, 390 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_SET_OFFSET], 391 &q54sj108a2_fops); 392 debugfs_create_file("blackbox_read", 0444, q54sj108a2_dir, 393 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_BLACKBOX_READ], 394 &q54sj108a2_fops); 395 debugfs_create_file("flash_key", 0444, q54sj108a2_dir, 396 &psu->debugfs_entries[Q54SJ108A2_DEBUGFS_FLASH_KEY], 397 &q54sj108a2_fops); 398 399 return 0; 400 } 401 402 static const struct of_device_id q54sj108a2_of_match[] = { 403 { .compatible = "delta,q54sj108a2", .data = (void *)q54sj108a2 }, 404 { }, 405 }; 406 407 MODULE_DEVICE_TABLE(of, q54sj108a2_of_match); 408 409 static struct i2c_driver q54sj108a2_driver = { 410 .driver = { 411 .name = "q54sj108a2", 412 .of_match_table = q54sj108a2_of_match, 413 }, 414 .probe_new = q54sj108a2_probe, 415 .id_table = q54sj108a2_id, 416 }; 417 418 module_i2c_driver(q54sj108a2_driver); 419 420 MODULE_AUTHOR("Xiao.Ma <xiao.mx.ma@deltaww.com>"); 421 MODULE_DESCRIPTION("PMBus driver for Delta Q54SJ108A2 series modules"); 422 MODULE_LICENSE("GPL"); 423 MODULE_IMPORT_NS(PMBUS); 424