1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2017 IBM Corp. 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/pmbus.h> 16 17 #include "pmbus.h" 18 19 #define CFFPS_FRU_CMD 0x9A 20 #define CFFPS_PN_CMD 0x9B 21 #define CFFPS_SN_CMD 0x9E 22 #define CFFPS_CCIN_CMD 0xBD 23 #define CFFPS_FW_CMD_START 0xFA 24 #define CFFPS_FW_NUM_BYTES 4 25 #define CFFPS_SYS_CONFIG_CMD 0xDA 26 27 #define CFFPS_INPUT_HISTORY_CMD 0xD6 28 #define CFFPS_INPUT_HISTORY_SIZE 100 29 30 /* STATUS_MFR_SPECIFIC bits */ 31 #define CFFPS_MFR_FAN_FAULT BIT(0) 32 #define CFFPS_MFR_THERMAL_FAULT BIT(1) 33 #define CFFPS_MFR_OV_FAULT BIT(2) 34 #define CFFPS_MFR_UV_FAULT BIT(3) 35 #define CFFPS_MFR_PS_KILL BIT(4) 36 #define CFFPS_MFR_OC_FAULT BIT(5) 37 #define CFFPS_MFR_VAUX_FAULT BIT(6) 38 #define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7) 39 40 #define CFFPS_LED_BLINK BIT(0) 41 #define CFFPS_LED_ON BIT(1) 42 #define CFFPS_LED_OFF BIT(2) 43 #define CFFPS_BLINK_RATE_MS 250 44 45 enum { 46 CFFPS_DEBUGFS_INPUT_HISTORY = 0, 47 CFFPS_DEBUGFS_FRU, 48 CFFPS_DEBUGFS_PN, 49 CFFPS_DEBUGFS_SN, 50 CFFPS_DEBUGFS_CCIN, 51 CFFPS_DEBUGFS_FW, 52 CFFPS_DEBUGFS_NUM_ENTRIES 53 }; 54 55 struct ibm_cffps_input_history { 56 struct mutex update_lock; 57 unsigned long last_update; 58 59 u8 byte_count; 60 u8 data[CFFPS_INPUT_HISTORY_SIZE]; 61 }; 62 63 struct ibm_cffps { 64 struct i2c_client *client; 65 66 struct ibm_cffps_input_history input_history; 67 68 int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES]; 69 70 char led_name[32]; 71 u8 led_state; 72 struct led_classdev led; 73 }; 74 75 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)]) 76 77 static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu, 78 char __user *buf, size_t count, 79 loff_t *ppos) 80 { 81 int rc; 82 u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD }; 83 u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 }; 84 struct i2c_msg msg[2] = { 85 { 86 .addr = psu->client->addr, 87 .flags = psu->client->flags, 88 .len = 1, 89 .buf = msgbuf0, 90 }, { 91 .addr = psu->client->addr, 92 .flags = psu->client->flags | I2C_M_RD, 93 .len = CFFPS_INPUT_HISTORY_SIZE + 1, 94 .buf = msgbuf1, 95 }, 96 }; 97 98 if (!*ppos) { 99 mutex_lock(&psu->input_history.update_lock); 100 if (time_after(jiffies, psu->input_history.last_update + HZ)) { 101 /* 102 * Use a raw i2c transfer, since we need more bytes 103 * than Linux I2C supports through smbus xfr (only 32). 104 */ 105 rc = i2c_transfer(psu->client->adapter, msg, 2); 106 if (rc < 0) { 107 mutex_unlock(&psu->input_history.update_lock); 108 return rc; 109 } 110 111 psu->input_history.byte_count = msgbuf1[0]; 112 memcpy(psu->input_history.data, &msgbuf1[1], 113 CFFPS_INPUT_HISTORY_SIZE); 114 psu->input_history.last_update = jiffies; 115 } 116 117 mutex_unlock(&psu->input_history.update_lock); 118 } 119 120 return simple_read_from_buffer(buf, count, ppos, 121 psu->input_history.data, 122 psu->input_history.byte_count); 123 } 124 125 static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf, 126 size_t count, loff_t *ppos) 127 { 128 u8 cmd; 129 int i, rc; 130 int *idxp = file->private_data; 131 int idx = *idxp; 132 struct ibm_cffps *psu = to_psu(idxp, idx); 133 char data[I2C_SMBUS_BLOCK_MAX] = { 0 }; 134 135 switch (idx) { 136 case CFFPS_DEBUGFS_INPUT_HISTORY: 137 return ibm_cffps_read_input_history(psu, buf, count, ppos); 138 case CFFPS_DEBUGFS_FRU: 139 cmd = CFFPS_FRU_CMD; 140 break; 141 case CFFPS_DEBUGFS_PN: 142 cmd = CFFPS_PN_CMD; 143 break; 144 case CFFPS_DEBUGFS_SN: 145 cmd = CFFPS_SN_CMD; 146 break; 147 case CFFPS_DEBUGFS_CCIN: 148 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD); 149 if (rc < 0) 150 return rc; 151 152 rc = snprintf(data, 5, "%04X", rc); 153 goto done; 154 case CFFPS_DEBUGFS_FW: 155 for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) { 156 rc = i2c_smbus_read_byte_data(psu->client, 157 CFFPS_FW_CMD_START + i); 158 if (rc < 0) 159 return rc; 160 161 snprintf(&data[i * 2], 3, "%02X", rc); 162 } 163 164 rc = i * 2; 165 goto done; 166 default: 167 return -EINVAL; 168 } 169 170 rc = i2c_smbus_read_block_data(psu->client, cmd, data); 171 if (rc < 0) 172 return rc; 173 174 done: 175 data[rc] = '\n'; 176 rc += 2; 177 178 return simple_read_from_buffer(buf, count, ppos, data, rc); 179 } 180 181 static const struct file_operations ibm_cffps_fops = { 182 .llseek = noop_llseek, 183 .read = ibm_cffps_debugfs_op, 184 .open = simple_open, 185 }; 186 187 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page, 188 int reg) 189 { 190 int rc, mfr; 191 192 switch (reg) { 193 case PMBUS_STATUS_VOUT: 194 case PMBUS_STATUS_IOUT: 195 case PMBUS_STATUS_TEMPERATURE: 196 case PMBUS_STATUS_FAN_12: 197 rc = pmbus_read_byte_data(client, page, reg); 198 if (rc < 0) 199 return rc; 200 201 mfr = pmbus_read_byte_data(client, page, 202 PMBUS_STATUS_MFR_SPECIFIC); 203 if (mfr < 0) 204 /* 205 * Return the status register instead of an error, 206 * since we successfully read status. 207 */ 208 return rc; 209 210 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */ 211 if (reg == PMBUS_STATUS_FAN_12) { 212 if (mfr & CFFPS_MFR_FAN_FAULT) 213 rc |= PB_FAN_FAN1_FAULT; 214 } else if (reg == PMBUS_STATUS_TEMPERATURE) { 215 if (mfr & CFFPS_MFR_THERMAL_FAULT) 216 rc |= PB_TEMP_OT_FAULT; 217 } else if (reg == PMBUS_STATUS_VOUT) { 218 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT)) 219 rc |= PB_VOLTAGE_OV_FAULT; 220 if (mfr & CFFPS_MFR_UV_FAULT) 221 rc |= PB_VOLTAGE_UV_FAULT; 222 } else if (reg == PMBUS_STATUS_IOUT) { 223 if (mfr & CFFPS_MFR_OC_FAULT) 224 rc |= PB_IOUT_OC_FAULT; 225 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING) 226 rc |= PB_CURRENT_SHARE_FAULT; 227 } 228 break; 229 default: 230 rc = -ENODATA; 231 break; 232 } 233 234 return rc; 235 } 236 237 static int ibm_cffps_read_word_data(struct i2c_client *client, int page, 238 int reg) 239 { 240 int rc, mfr; 241 242 switch (reg) { 243 case PMBUS_STATUS_WORD: 244 rc = pmbus_read_word_data(client, page, reg); 245 if (rc < 0) 246 return rc; 247 248 mfr = pmbus_read_byte_data(client, page, 249 PMBUS_STATUS_MFR_SPECIFIC); 250 if (mfr < 0) 251 /* 252 * Return the status register instead of an error, 253 * since we successfully read status. 254 */ 255 return rc; 256 257 if (mfr & CFFPS_MFR_PS_KILL) 258 rc |= PB_STATUS_OFF; 259 break; 260 default: 261 rc = -ENODATA; 262 break; 263 } 264 265 return rc; 266 } 267 268 static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev, 269 enum led_brightness brightness) 270 { 271 int rc; 272 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led); 273 274 if (brightness == LED_OFF) { 275 psu->led_state = CFFPS_LED_OFF; 276 } else { 277 brightness = LED_FULL; 278 if (psu->led_state != CFFPS_LED_BLINK) 279 psu->led_state = CFFPS_LED_ON; 280 } 281 282 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, 283 psu->led_state); 284 if (rc < 0) 285 return; 286 287 led_cdev->brightness = brightness; 288 } 289 290 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev, 291 unsigned long *delay_on, 292 unsigned long *delay_off) 293 { 294 int rc; 295 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led); 296 297 psu->led_state = CFFPS_LED_BLINK; 298 299 if (led_cdev->brightness == LED_OFF) 300 return 0; 301 302 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, 303 CFFPS_LED_BLINK); 304 if (rc < 0) 305 return rc; 306 307 *delay_on = CFFPS_BLINK_RATE_MS; 308 *delay_off = CFFPS_BLINK_RATE_MS; 309 310 return 0; 311 } 312 313 static void ibm_cffps_create_led_class(struct ibm_cffps *psu) 314 { 315 int rc; 316 struct i2c_client *client = psu->client; 317 struct device *dev = &client->dev; 318 319 snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name, 320 client->addr); 321 psu->led.name = psu->led_name; 322 psu->led.max_brightness = LED_FULL; 323 psu->led.brightness_set = ibm_cffps_led_brightness_set; 324 psu->led.blink_set = ibm_cffps_led_blink_set; 325 326 rc = devm_led_classdev_register(dev, &psu->led); 327 if (rc) 328 dev_warn(dev, "failed to register led class: %d\n", rc); 329 } 330 331 static struct pmbus_driver_info ibm_cffps_info = { 332 .pages = 1, 333 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | 334 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | 335 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT | 336 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT | 337 PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12, 338 .read_byte_data = ibm_cffps_read_byte_data, 339 .read_word_data = ibm_cffps_read_word_data, 340 }; 341 342 static struct pmbus_platform_data ibm_cffps_pdata = { 343 .flags = PMBUS_SKIP_STATUS_CHECK, 344 }; 345 346 static int ibm_cffps_probe(struct i2c_client *client, 347 const struct i2c_device_id *id) 348 { 349 int i, rc; 350 struct dentry *debugfs; 351 struct dentry *ibm_cffps_dir; 352 struct ibm_cffps *psu; 353 354 client->dev.platform_data = &ibm_cffps_pdata; 355 rc = pmbus_do_probe(client, id, &ibm_cffps_info); 356 if (rc) 357 return rc; 358 359 /* 360 * Don't fail the probe if there isn't enough memory for leds and 361 * debugfs. 362 */ 363 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); 364 if (!psu) 365 return 0; 366 367 psu->client = client; 368 mutex_init(&psu->input_history.update_lock); 369 psu->input_history.last_update = jiffies - HZ; 370 371 ibm_cffps_create_led_class(psu); 372 373 /* Don't fail the probe if we can't create debugfs */ 374 debugfs = pmbus_get_debugfs_dir(client); 375 if (!debugfs) 376 return 0; 377 378 ibm_cffps_dir = debugfs_create_dir(client->name, debugfs); 379 if (!ibm_cffps_dir) 380 return 0; 381 382 for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i) 383 psu->debugfs_entries[i] = i; 384 385 debugfs_create_file("input_history", 0444, ibm_cffps_dir, 386 &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY], 387 &ibm_cffps_fops); 388 debugfs_create_file("fru", 0444, ibm_cffps_dir, 389 &psu->debugfs_entries[CFFPS_DEBUGFS_FRU], 390 &ibm_cffps_fops); 391 debugfs_create_file("part_number", 0444, ibm_cffps_dir, 392 &psu->debugfs_entries[CFFPS_DEBUGFS_PN], 393 &ibm_cffps_fops); 394 debugfs_create_file("serial_number", 0444, ibm_cffps_dir, 395 &psu->debugfs_entries[CFFPS_DEBUGFS_SN], 396 &ibm_cffps_fops); 397 debugfs_create_file("ccin", 0444, ibm_cffps_dir, 398 &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN], 399 &ibm_cffps_fops); 400 debugfs_create_file("fw_version", 0444, ibm_cffps_dir, 401 &psu->debugfs_entries[CFFPS_DEBUGFS_FW], 402 &ibm_cffps_fops); 403 404 return 0; 405 } 406 407 static const struct i2c_device_id ibm_cffps_id[] = { 408 { "ibm_cffps1", 1 }, 409 {} 410 }; 411 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id); 412 413 static const struct of_device_id ibm_cffps_of_match[] = { 414 { .compatible = "ibm,cffps1" }, 415 {} 416 }; 417 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match); 418 419 static struct i2c_driver ibm_cffps_driver = { 420 .driver = { 421 .name = "ibm-cffps", 422 .of_match_table = ibm_cffps_of_match, 423 }, 424 .probe = ibm_cffps_probe, 425 .remove = pmbus_do_remove, 426 .id_table = ibm_cffps_id, 427 }; 428 429 module_i2c_driver(ibm_cffps_driver); 430 431 MODULE_AUTHOR("Eddie James"); 432 MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies"); 433 MODULE_LICENSE("GPL"); 434