1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ADM1266 - Cascadable Super Sequencer with Margin 4 * Control and Fault Recording 5 * 6 * Copyright 2020 Analog Devices Inc. 7 */ 8 9 #include <linux/bitfield.h> 10 #include <linux/crc8.h> 11 #include <linux/debugfs.h> 12 #include <linux/gpio/driver.h> 13 #include <linux/i2c.h> 14 #include <linux/i2c-smbus.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/nvmem-consumer.h> 19 #include <linux/nvmem-provider.h> 20 #include "pmbus.h" 21 #include <linux/slab.h> 22 #include <linux/timekeeping.h> 23 24 #define ADM1266_BLACKBOX_CONFIG 0xD3 25 #define ADM1266_PDIO_CONFIG 0xD4 26 #define ADM1266_READ_STATE 0xD9 27 #define ADM1266_READ_BLACKBOX 0xDE 28 #define ADM1266_SET_RTC 0xDF 29 #define ADM1266_GPIO_CONFIG 0xE1 30 #define ADM1266_BLACKBOX_INFO 0xE6 31 #define ADM1266_PDIO_STATUS 0xE9 32 #define ADM1266_GPIO_STATUS 0xEA 33 34 /* ADM1266 GPIO defines */ 35 #define ADM1266_GPIO_NR 9 36 #define ADM1266_GPIO_FUNCTIONS(x) FIELD_GET(BIT(0), x) 37 #define ADM1266_GPIO_INPUT_EN(x) FIELD_GET(BIT(2), x) 38 #define ADM1266_GPIO_OUTPUT_EN(x) FIELD_GET(BIT(3), x) 39 #define ADM1266_GPIO_OPEN_DRAIN(x) FIELD_GET(BIT(4), x) 40 41 /* ADM1266 PDIO defines */ 42 #define ADM1266_PDIO_NR 16 43 #define ADM1266_PDIO_PIN_CFG(x) FIELD_GET(GENMASK(15, 13), x) 44 #define ADM1266_PDIO_GLITCH_FILT(x) FIELD_GET(GENMASK(12, 9), x) 45 #define ADM1266_PDIO_OUT_CFG(x) FIELD_GET(GENMASK(2, 0), x) 46 47 #define ADM1266_BLACKBOX_OFFSET 0 48 #define ADM1266_BLACKBOX_SIZE 64 49 50 #define ADM1266_PMBUS_BLOCK_MAX 255 51 52 struct adm1266_data { 53 struct pmbus_driver_info info; 54 struct gpio_chip gc; 55 const char *gpio_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR]; 56 struct i2c_client *client; 57 struct dentry *debugfs_dir; 58 struct nvmem_config nvmem_config; 59 struct nvmem_device *nvmem; 60 u8 *dev_mem; 61 struct mutex buf_mutex; 62 u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; 63 u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned; 64 }; 65 66 static const struct nvmem_cell_info adm1266_nvmem_cells[] = { 67 { 68 .name = "blackbox", 69 .offset = ADM1266_BLACKBOX_OFFSET, 70 .bytes = 2048, 71 }, 72 }; 73 74 DECLARE_CRC8_TABLE(pmbus_crc_table); 75 76 /* 77 * Different from Block Read as it sends data and waits for the slave to 78 * return a value dependent on that data. The protocol is simply a Write Block 79 * followed by a Read Block without the Read-Block command field and the 80 * Write-Block STOP bit. 81 */ 82 static int adm1266_pmbus_block_xfer(struct adm1266_data *data, u8 cmd, u8 w_len, u8 *data_w, 83 u8 *data_r) 84 { 85 struct i2c_client *client = data->client; 86 struct i2c_msg msgs[2] = { 87 { 88 .addr = client->addr, 89 .flags = I2C_M_DMA_SAFE, 90 .buf = data->write_buf, 91 .len = w_len + 2, 92 }, 93 { 94 .addr = client->addr, 95 .flags = I2C_M_RD | I2C_M_DMA_SAFE, 96 .buf = data->read_buf, 97 .len = ADM1266_PMBUS_BLOCK_MAX + 2, 98 } 99 }; 100 u8 addr; 101 u8 crc; 102 int ret; 103 104 mutex_lock(&data->buf_mutex); 105 106 msgs[0].buf[0] = cmd; 107 msgs[0].buf[1] = w_len; 108 memcpy(&msgs[0].buf[2], data_w, w_len); 109 110 ret = i2c_transfer(client->adapter, msgs, 2); 111 if (ret != 2) { 112 if (ret >= 0) 113 ret = -EPROTO; 114 115 mutex_unlock(&data->buf_mutex); 116 117 return ret; 118 } 119 120 if (client->flags & I2C_CLIENT_PEC) { 121 addr = i2c_8bit_addr_from_msg(&msgs[0]); 122 crc = crc8(pmbus_crc_table, &addr, 1, 0); 123 crc = crc8(pmbus_crc_table, msgs[0].buf, msgs[0].len, crc); 124 125 addr = i2c_8bit_addr_from_msg(&msgs[1]); 126 crc = crc8(pmbus_crc_table, &addr, 1, crc); 127 crc = crc8(pmbus_crc_table, msgs[1].buf, msgs[1].buf[0] + 1, crc); 128 129 if (crc != msgs[1].buf[msgs[1].buf[0] + 1]) { 130 mutex_unlock(&data->buf_mutex); 131 return -EBADMSG; 132 } 133 } 134 135 memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); 136 137 ret = msgs[1].buf[0]; 138 mutex_unlock(&data->buf_mutex); 139 140 return ret; 141 } 142 143 static const unsigned int adm1266_gpio_mapping[ADM1266_GPIO_NR][2] = { 144 {1, 0}, 145 {2, 1}, 146 {3, 2}, 147 {4, 8}, 148 {5, 9}, 149 {6, 10}, 150 {7, 11}, 151 {8, 6}, 152 {9, 7}, 153 }; 154 155 static const char *adm1266_names[ADM1266_GPIO_NR + ADM1266_PDIO_NR] = { 156 "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7", "GPIO8", 157 "GPIO9", "PDIO1", "PDIO2", "PDIO3", "PDIO4", "PDIO5", "PDIO6", 158 "PDIO7", "PDIO8", "PDIO9", "PDIO10", "PDIO11", "PDIO12", "PDIO13", 159 "PDIO14", "PDIO15", "PDIO16", 160 }; 161 162 static int adm1266_gpio_get(struct gpio_chip *chip, unsigned int offset) 163 { 164 struct adm1266_data *data = gpiochip_get_data(chip); 165 u8 read_buf[I2C_SMBUS_BLOCK_MAX + 1]; 166 unsigned long pins_status; 167 unsigned int pmbus_cmd; 168 int ret; 169 170 if (offset < ADM1266_GPIO_NR) 171 pmbus_cmd = ADM1266_GPIO_STATUS; 172 else 173 pmbus_cmd = ADM1266_PDIO_STATUS; 174 175 ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf); 176 if (ret < 0) 177 return ret; 178 179 pins_status = read_buf[0] + (read_buf[1] << 8); 180 if (offset < ADM1266_GPIO_NR) 181 return test_bit(adm1266_gpio_mapping[offset][1], &pins_status); 182 183 return test_bit(offset - ADM1266_GPIO_NR, &pins_status); 184 } 185 186 static int adm1266_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, 187 unsigned long *bits) 188 { 189 struct adm1266_data *data = gpiochip_get_data(chip); 190 u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1]; 191 unsigned long status; 192 unsigned int gpio_nr; 193 int ret; 194 195 ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf); 196 if (ret < 0) 197 return ret; 198 199 status = read_buf[0] + (read_buf[1] << 8); 200 201 *bits = 0; 202 for_each_set_bit(gpio_nr, mask, ADM1266_GPIO_NR) { 203 if (test_bit(adm1266_gpio_mapping[gpio_nr][1], &status)) 204 set_bit(gpio_nr, bits); 205 } 206 207 ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, read_buf); 208 if (ret < 0) 209 return ret; 210 211 status = read_buf[0] + (read_buf[1] << 8); 212 213 *bits = 0; 214 for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) { 215 if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status)) 216 set_bit(gpio_nr, bits); 217 } 218 219 return 0; 220 } 221 222 static void adm1266_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) 223 { 224 struct adm1266_data *data = gpiochip_get_data(chip); 225 u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1]; 226 unsigned long gpio_config; 227 unsigned long pdio_config; 228 unsigned long pin_cfg; 229 u8 write_cmd; 230 int ret; 231 int i; 232 233 for (i = 0; i < ADM1266_GPIO_NR; i++) { 234 write_cmd = adm1266_gpio_mapping[i][1]; 235 ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf); 236 if (ret != 2) 237 return; 238 239 gpio_config = read_buf[0]; 240 seq_puts(s, adm1266_names[i]); 241 242 seq_puts(s, " ( "); 243 if (!ADM1266_GPIO_FUNCTIONS(gpio_config)) { 244 seq_puts(s, "high-Z )\n"); 245 continue; 246 } 247 if (ADM1266_GPIO_INPUT_EN(gpio_config)) 248 seq_puts(s, "input "); 249 if (ADM1266_GPIO_OUTPUT_EN(gpio_config)) 250 seq_puts(s, "output "); 251 if (ADM1266_GPIO_OPEN_DRAIN(gpio_config)) 252 seq_puts(s, "open-drain )\n"); 253 else 254 seq_puts(s, "push-pull )\n"); 255 } 256 257 write_cmd = 0xFF; 258 ret = adm1266_pmbus_block_xfer(data, ADM1266_PDIO_CONFIG, 1, &write_cmd, read_buf); 259 if (ret != 32) 260 return; 261 262 for (i = 0; i < ADM1266_PDIO_NR; i++) { 263 seq_puts(s, adm1266_names[ADM1266_GPIO_NR + i]); 264 265 pdio_config = read_buf[2 * i]; 266 pdio_config += (read_buf[2 * i + 1] << 8); 267 pin_cfg = ADM1266_PDIO_PIN_CFG(pdio_config); 268 269 seq_puts(s, " ( "); 270 if (!pin_cfg || pin_cfg > 5) { 271 seq_puts(s, "high-Z )\n"); 272 continue; 273 } 274 275 if (pin_cfg & BIT(0)) 276 seq_puts(s, "output "); 277 278 if (pin_cfg & BIT(1)) 279 seq_puts(s, "input "); 280 281 seq_puts(s, ")\n"); 282 } 283 } 284 285 static int adm1266_config_gpio(struct adm1266_data *data) 286 { 287 const char *name = dev_name(&data->client->dev); 288 char *gpio_name; 289 int ret; 290 int i; 291 292 for (i = 0; i < ARRAY_SIZE(data->gpio_names); i++) { 293 gpio_name = devm_kasprintf(&data->client->dev, GFP_KERNEL, "adm1266-%x-%s", 294 data->client->addr, adm1266_names[i]); 295 if (!gpio_name) 296 return -ENOMEM; 297 298 data->gpio_names[i] = gpio_name; 299 } 300 301 data->gc.label = name; 302 data->gc.parent = &data->client->dev; 303 data->gc.owner = THIS_MODULE; 304 data->gc.can_sleep = true; 305 data->gc.base = -1; 306 data->gc.names = data->gpio_names; 307 data->gc.ngpio = ARRAY_SIZE(data->gpio_names); 308 data->gc.get = adm1266_gpio_get; 309 data->gc.get_multiple = adm1266_gpio_get_multiple; 310 data->gc.dbg_show = adm1266_gpio_dbg_show; 311 312 ret = devm_gpiochip_add_data(&data->client->dev, &data->gc, data); 313 if (ret) 314 dev_err(&data->client->dev, "GPIO registering failed (%d)\n", ret); 315 316 return ret; 317 } 318 319 static int adm1266_state_read(struct seq_file *s, void *pdata) 320 { 321 struct device *dev = s->private; 322 struct i2c_client *client = to_i2c_client(dev); 323 int ret; 324 325 ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE); 326 if (ret < 0) 327 return ret; 328 329 seq_printf(s, "%d\n", ret); 330 331 return 0; 332 } 333 334 static void adm1266_init_debugfs(struct adm1266_data *data) 335 { 336 struct dentry *root; 337 338 root = pmbus_get_debugfs_dir(data->client); 339 if (!root) 340 return; 341 342 data->debugfs_dir = debugfs_create_dir(data->client->name, root); 343 if (!data->debugfs_dir) 344 return; 345 346 debugfs_create_devm_seqfile(&data->client->dev, "sequencer_state", data->debugfs_dir, 347 adm1266_state_read); 348 } 349 350 static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff) 351 { 352 int record_count; 353 char index; 354 u8 buf[5]; 355 int ret; 356 357 ret = i2c_smbus_read_block_data(data->client, ADM1266_BLACKBOX_INFO, buf); 358 if (ret < 0) 359 return ret; 360 361 if (ret != 4) 362 return -EIO; 363 364 record_count = buf[3]; 365 366 for (index = 0; index < record_count; index++) { 367 ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff); 368 if (ret < 0) 369 return ret; 370 371 if (ret != ADM1266_BLACKBOX_SIZE) 372 return -EIO; 373 374 read_buff += ADM1266_BLACKBOX_SIZE; 375 } 376 377 return 0; 378 } 379 380 static int adm1266_nvmem_read(void *priv, unsigned int offset, void *val, size_t bytes) 381 { 382 struct adm1266_data *data = priv; 383 int ret; 384 385 if (offset + bytes > data->nvmem_config.size) 386 return -EINVAL; 387 388 if (offset == 0) { 389 memset(data->dev_mem, 0, data->nvmem_config.size); 390 391 ret = adm1266_nvmem_read_blackbox(data, data->dev_mem); 392 if (ret) { 393 dev_err(&data->client->dev, "Could not read blackbox!"); 394 return ret; 395 } 396 } 397 398 memcpy(val, data->dev_mem + offset, bytes); 399 400 return 0; 401 } 402 403 static int adm1266_config_nvmem(struct adm1266_data *data) 404 { 405 data->nvmem_config.name = dev_name(&data->client->dev); 406 data->nvmem_config.dev = &data->client->dev; 407 data->nvmem_config.root_only = true; 408 data->nvmem_config.read_only = true; 409 data->nvmem_config.owner = THIS_MODULE; 410 data->nvmem_config.reg_read = adm1266_nvmem_read; 411 data->nvmem_config.cells = adm1266_nvmem_cells; 412 data->nvmem_config.ncells = ARRAY_SIZE(adm1266_nvmem_cells); 413 data->nvmem_config.priv = data; 414 data->nvmem_config.stride = 1; 415 data->nvmem_config.word_size = 1; 416 data->nvmem_config.size = adm1266_nvmem_cells[0].bytes; 417 418 data->dev_mem = devm_kzalloc(&data->client->dev, data->nvmem_config.size, GFP_KERNEL); 419 if (!data->dev_mem) 420 return -ENOMEM; 421 422 data->nvmem = devm_nvmem_register(&data->client->dev, &data->nvmem_config); 423 if (IS_ERR(data->nvmem)) { 424 dev_err(&data->client->dev, "Could not register nvmem!"); 425 return PTR_ERR(data->nvmem); 426 } 427 428 return 0; 429 } 430 431 static int adm1266_set_rtc(struct adm1266_data *data) 432 { 433 time64_t kt; 434 char write_buf[6]; 435 int i; 436 437 kt = ktime_get_seconds(); 438 439 memset(write_buf, 0, sizeof(write_buf)); 440 441 for (i = 0; i < 4; i++) 442 write_buf[2 + i] = (kt >> (i * 8)) & 0xFF; 443 444 return i2c_smbus_write_block_data(data->client, ADM1266_SET_RTC, sizeof(write_buf), 445 write_buf); 446 } 447 448 static int adm1266_probe(struct i2c_client *client) 449 { 450 struct adm1266_data *data; 451 int ret; 452 int i; 453 454 data = devm_kzalloc(&client->dev, sizeof(struct adm1266_data), GFP_KERNEL); 455 if (!data) 456 return -ENOMEM; 457 458 data->client = client; 459 data->info.pages = 17; 460 data->info.format[PSC_VOLTAGE_OUT] = linear; 461 for (i = 0; i < data->info.pages; i++) 462 data->info.func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT; 463 464 crc8_populate_msb(pmbus_crc_table, 0x7); 465 mutex_init(&data->buf_mutex); 466 467 ret = adm1266_config_gpio(data); 468 if (ret < 0) 469 return ret; 470 471 ret = adm1266_set_rtc(data); 472 if (ret < 0) 473 return ret; 474 475 ret = adm1266_config_nvmem(data); 476 if (ret < 0) 477 return ret; 478 479 ret = pmbus_do_probe(client, &data->info); 480 if (ret) 481 return ret; 482 483 adm1266_init_debugfs(data); 484 485 return 0; 486 } 487 488 static const struct of_device_id adm1266_of_match[] = { 489 { .compatible = "adi,adm1266" }, 490 { } 491 }; 492 MODULE_DEVICE_TABLE(of, adm1266_of_match); 493 494 static const struct i2c_device_id adm1266_id[] = { 495 { "adm1266", 0 }, 496 { } 497 }; 498 MODULE_DEVICE_TABLE(i2c, adm1266_id); 499 500 static struct i2c_driver adm1266_driver = { 501 .driver = { 502 .name = "adm1266", 503 .of_match_table = adm1266_of_match, 504 }, 505 .probe_new = adm1266_probe, 506 .id_table = adm1266_id, 507 }; 508 509 module_i2c_driver(adm1266_driver); 510 511 MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>"); 512 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1266"); 513 MODULE_LICENSE("GPL v2"); 514 MODULE_IMPORT_NS(PMBUS); 515