1 /* 2 * Copyright 2017 IBM Corp. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 */ 9 10 #include <linux/bitops.h> 11 #include <linux/debugfs.h> 12 #include <linux/device.h> 13 #include <linux/fs.h> 14 #include <linux/i2c.h> 15 #include <linux/jiffies.h> 16 #include <linux/leds.h> 17 #include <linux/module.h> 18 #include <linux/mutex.h> 19 #include <linux/pmbus.h> 20 21 #include "pmbus.h" 22 23 #define CFFPS_FRU_CMD 0x9A 24 #define CFFPS_PN_CMD 0x9B 25 #define CFFPS_SN_CMD 0x9E 26 #define CFFPS_CCIN_CMD 0xBD 27 #define CFFPS_FW_CMD_START 0xFA 28 #define CFFPS_FW_NUM_BYTES 4 29 #define CFFPS_SYS_CONFIG_CMD 0xDA 30 31 #define CFFPS_INPUT_HISTORY_CMD 0xD6 32 #define CFFPS_INPUT_HISTORY_SIZE 100 33 34 /* STATUS_MFR_SPECIFIC bits */ 35 #define CFFPS_MFR_FAN_FAULT BIT(0) 36 #define CFFPS_MFR_THERMAL_FAULT BIT(1) 37 #define CFFPS_MFR_OV_FAULT BIT(2) 38 #define CFFPS_MFR_UV_FAULT BIT(3) 39 #define CFFPS_MFR_PS_KILL BIT(4) 40 #define CFFPS_MFR_OC_FAULT BIT(5) 41 #define CFFPS_MFR_VAUX_FAULT BIT(6) 42 #define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7) 43 44 #define CFFPS_LED_BLINK BIT(0) 45 #define CFFPS_LED_ON BIT(1) 46 #define CFFPS_LED_OFF BIT(2) 47 #define CFFPS_BLINK_RATE_MS 250 48 49 enum { 50 CFFPS_DEBUGFS_INPUT_HISTORY = 0, 51 CFFPS_DEBUGFS_FRU, 52 CFFPS_DEBUGFS_PN, 53 CFFPS_DEBUGFS_SN, 54 CFFPS_DEBUGFS_CCIN, 55 CFFPS_DEBUGFS_FW, 56 CFFPS_DEBUGFS_NUM_ENTRIES 57 }; 58 59 struct ibm_cffps_input_history { 60 struct mutex update_lock; 61 unsigned long last_update; 62 63 u8 byte_count; 64 u8 data[CFFPS_INPUT_HISTORY_SIZE]; 65 }; 66 67 struct ibm_cffps { 68 struct i2c_client *client; 69 70 struct ibm_cffps_input_history input_history; 71 72 int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES]; 73 74 char led_name[32]; 75 u8 led_state; 76 struct led_classdev led; 77 }; 78 79 #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)]) 80 81 static ssize_t ibm_cffps_read_input_history(struct ibm_cffps *psu, 82 char __user *buf, size_t count, 83 loff_t *ppos) 84 { 85 int rc; 86 u8 msgbuf0[1] = { CFFPS_INPUT_HISTORY_CMD }; 87 u8 msgbuf1[CFFPS_INPUT_HISTORY_SIZE + 1] = { 0 }; 88 struct i2c_msg msg[2] = { 89 { 90 .addr = psu->client->addr, 91 .flags = psu->client->flags, 92 .len = 1, 93 .buf = msgbuf0, 94 }, { 95 .addr = psu->client->addr, 96 .flags = psu->client->flags | I2C_M_RD, 97 .len = CFFPS_INPUT_HISTORY_SIZE + 1, 98 .buf = msgbuf1, 99 }, 100 }; 101 102 if (!*ppos) { 103 mutex_lock(&psu->input_history.update_lock); 104 if (time_after(jiffies, psu->input_history.last_update + HZ)) { 105 /* 106 * Use a raw i2c transfer, since we need more bytes 107 * than Linux I2C supports through smbus xfr (only 32). 108 */ 109 rc = i2c_transfer(psu->client->adapter, msg, 2); 110 if (rc < 0) { 111 mutex_unlock(&psu->input_history.update_lock); 112 return rc; 113 } 114 115 psu->input_history.byte_count = msgbuf1[0]; 116 memcpy(psu->input_history.data, &msgbuf1[1], 117 CFFPS_INPUT_HISTORY_SIZE); 118 psu->input_history.last_update = jiffies; 119 } 120 121 mutex_unlock(&psu->input_history.update_lock); 122 } 123 124 return simple_read_from_buffer(buf, count, ppos, 125 psu->input_history.data, 126 psu->input_history.byte_count); 127 } 128 129 static ssize_t ibm_cffps_debugfs_op(struct file *file, char __user *buf, 130 size_t count, loff_t *ppos) 131 { 132 u8 cmd; 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] = { 0 }; 138 139 switch (idx) { 140 case CFFPS_DEBUGFS_INPUT_HISTORY: 141 return ibm_cffps_read_input_history(psu, buf, count, ppos); 142 case CFFPS_DEBUGFS_FRU: 143 cmd = CFFPS_FRU_CMD; 144 break; 145 case CFFPS_DEBUGFS_PN: 146 cmd = CFFPS_PN_CMD; 147 break; 148 case CFFPS_DEBUGFS_SN: 149 cmd = CFFPS_SN_CMD; 150 break; 151 case CFFPS_DEBUGFS_CCIN: 152 rc = i2c_smbus_read_word_swapped(psu->client, CFFPS_CCIN_CMD); 153 if (rc < 0) 154 return rc; 155 156 rc = snprintf(data, 5, "%04X", rc); 157 goto done; 158 case CFFPS_DEBUGFS_FW: 159 for (i = 0; i < CFFPS_FW_NUM_BYTES; ++i) { 160 rc = i2c_smbus_read_byte_data(psu->client, 161 CFFPS_FW_CMD_START + i); 162 if (rc < 0) 163 return rc; 164 165 snprintf(&data[i * 2], 3, "%02X", rc); 166 } 167 168 rc = i * 2; 169 goto done; 170 default: 171 return -EINVAL; 172 } 173 174 rc = i2c_smbus_read_block_data(psu->client, cmd, data); 175 if (rc < 0) 176 return rc; 177 178 done: 179 data[rc] = '\n'; 180 rc += 2; 181 182 return simple_read_from_buffer(buf, count, ppos, data, rc); 183 } 184 185 static const struct file_operations ibm_cffps_fops = { 186 .llseek = noop_llseek, 187 .read = ibm_cffps_debugfs_op, 188 .open = simple_open, 189 }; 190 191 static int ibm_cffps_read_byte_data(struct i2c_client *client, int page, 192 int reg) 193 { 194 int rc, mfr; 195 196 switch (reg) { 197 case PMBUS_STATUS_VOUT: 198 case PMBUS_STATUS_IOUT: 199 case PMBUS_STATUS_TEMPERATURE: 200 case PMBUS_STATUS_FAN_12: 201 rc = pmbus_read_byte_data(client, page, reg); 202 if (rc < 0) 203 return rc; 204 205 mfr = pmbus_read_byte_data(client, page, 206 PMBUS_STATUS_MFR_SPECIFIC); 207 if (mfr < 0) 208 /* 209 * Return the status register instead of an error, 210 * since we successfully read status. 211 */ 212 return rc; 213 214 /* Add MFR_SPECIFIC bits to the standard pmbus status regs. */ 215 if (reg == PMBUS_STATUS_FAN_12) { 216 if (mfr & CFFPS_MFR_FAN_FAULT) 217 rc |= PB_FAN_FAN1_FAULT; 218 } else if (reg == PMBUS_STATUS_TEMPERATURE) { 219 if (mfr & CFFPS_MFR_THERMAL_FAULT) 220 rc |= PB_TEMP_OT_FAULT; 221 } else if (reg == PMBUS_STATUS_VOUT) { 222 if (mfr & (CFFPS_MFR_OV_FAULT | CFFPS_MFR_VAUX_FAULT)) 223 rc |= PB_VOLTAGE_OV_FAULT; 224 if (mfr & CFFPS_MFR_UV_FAULT) 225 rc |= PB_VOLTAGE_UV_FAULT; 226 } else if (reg == PMBUS_STATUS_IOUT) { 227 if (mfr & CFFPS_MFR_OC_FAULT) 228 rc |= PB_IOUT_OC_FAULT; 229 if (mfr & CFFPS_MFR_CURRENT_SHARE_WARNING) 230 rc |= PB_CURRENT_SHARE_FAULT; 231 } 232 break; 233 default: 234 rc = -ENODATA; 235 break; 236 } 237 238 return rc; 239 } 240 241 static int ibm_cffps_read_word_data(struct i2c_client *client, int page, 242 int reg) 243 { 244 int rc, mfr; 245 246 switch (reg) { 247 case PMBUS_STATUS_WORD: 248 rc = pmbus_read_word_data(client, page, reg); 249 if (rc < 0) 250 return rc; 251 252 mfr = pmbus_read_byte_data(client, page, 253 PMBUS_STATUS_MFR_SPECIFIC); 254 if (mfr < 0) 255 /* 256 * Return the status register instead of an error, 257 * since we successfully read status. 258 */ 259 return rc; 260 261 if (mfr & CFFPS_MFR_PS_KILL) 262 rc |= PB_STATUS_OFF; 263 break; 264 default: 265 rc = -ENODATA; 266 break; 267 } 268 269 return rc; 270 } 271 272 static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev, 273 enum led_brightness brightness) 274 { 275 int rc; 276 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led); 277 278 if (brightness == LED_OFF) { 279 psu->led_state = CFFPS_LED_OFF; 280 } else { 281 brightness = LED_FULL; 282 if (psu->led_state != CFFPS_LED_BLINK) 283 psu->led_state = CFFPS_LED_ON; 284 } 285 286 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, 287 psu->led_state); 288 if (rc < 0) 289 return; 290 291 led_cdev->brightness = brightness; 292 } 293 294 static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev, 295 unsigned long *delay_on, 296 unsigned long *delay_off) 297 { 298 int rc; 299 struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led); 300 301 psu->led_state = CFFPS_LED_BLINK; 302 303 if (led_cdev->brightness == LED_OFF) 304 return 0; 305 306 rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, 307 CFFPS_LED_BLINK); 308 if (rc < 0) 309 return rc; 310 311 *delay_on = CFFPS_BLINK_RATE_MS; 312 *delay_off = CFFPS_BLINK_RATE_MS; 313 314 return 0; 315 } 316 317 static void ibm_cffps_create_led_class(struct ibm_cffps *psu) 318 { 319 int rc; 320 struct i2c_client *client = psu->client; 321 struct device *dev = &client->dev; 322 323 snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name, 324 client->addr); 325 psu->led.name = psu->led_name; 326 psu->led.max_brightness = LED_FULL; 327 psu->led.brightness_set = ibm_cffps_led_brightness_set; 328 psu->led.blink_set = ibm_cffps_led_blink_set; 329 330 rc = devm_led_classdev_register(dev, &psu->led); 331 if (rc) 332 dev_warn(dev, "failed to register led class: %d\n", rc); 333 } 334 335 static struct pmbus_driver_info ibm_cffps_info = { 336 .pages = 1, 337 .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | 338 PMBUS_HAVE_PIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | 339 PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT | 340 PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT | 341 PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12, 342 .read_byte_data = ibm_cffps_read_byte_data, 343 .read_word_data = ibm_cffps_read_word_data, 344 }; 345 346 static struct pmbus_platform_data ibm_cffps_pdata = { 347 .flags = PMBUS_SKIP_STATUS_CHECK, 348 }; 349 350 static int ibm_cffps_probe(struct i2c_client *client, 351 const struct i2c_device_id *id) 352 { 353 int i, rc; 354 struct dentry *debugfs; 355 struct dentry *ibm_cffps_dir; 356 struct ibm_cffps *psu; 357 358 client->dev.platform_data = &ibm_cffps_pdata; 359 rc = pmbus_do_probe(client, id, &ibm_cffps_info); 360 if (rc) 361 return rc; 362 363 /* 364 * Don't fail the probe if there isn't enough memory for leds and 365 * debugfs. 366 */ 367 psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); 368 if (!psu) 369 return 0; 370 371 psu->client = client; 372 mutex_init(&psu->input_history.update_lock); 373 psu->input_history.last_update = jiffies - HZ; 374 375 ibm_cffps_create_led_class(psu); 376 377 /* Don't fail the probe if we can't create debugfs */ 378 debugfs = pmbus_get_debugfs_dir(client); 379 if (!debugfs) 380 return 0; 381 382 ibm_cffps_dir = debugfs_create_dir(client->name, debugfs); 383 if (!ibm_cffps_dir) 384 return 0; 385 386 for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i) 387 psu->debugfs_entries[i] = i; 388 389 debugfs_create_file("input_history", 0444, ibm_cffps_dir, 390 &psu->debugfs_entries[CFFPS_DEBUGFS_INPUT_HISTORY], 391 &ibm_cffps_fops); 392 debugfs_create_file("fru", 0444, ibm_cffps_dir, 393 &psu->debugfs_entries[CFFPS_DEBUGFS_FRU], 394 &ibm_cffps_fops); 395 debugfs_create_file("part_number", 0444, ibm_cffps_dir, 396 &psu->debugfs_entries[CFFPS_DEBUGFS_PN], 397 &ibm_cffps_fops); 398 debugfs_create_file("serial_number", 0444, ibm_cffps_dir, 399 &psu->debugfs_entries[CFFPS_DEBUGFS_SN], 400 &ibm_cffps_fops); 401 debugfs_create_file("ccin", 0444, ibm_cffps_dir, 402 &psu->debugfs_entries[CFFPS_DEBUGFS_CCIN], 403 &ibm_cffps_fops); 404 debugfs_create_file("fw_version", 0444, ibm_cffps_dir, 405 &psu->debugfs_entries[CFFPS_DEBUGFS_FW], 406 &ibm_cffps_fops); 407 408 return 0; 409 } 410 411 static const struct i2c_device_id ibm_cffps_id[] = { 412 { "ibm_cffps1", 1 }, 413 {} 414 }; 415 MODULE_DEVICE_TABLE(i2c, ibm_cffps_id); 416 417 static const struct of_device_id ibm_cffps_of_match[] = { 418 { .compatible = "ibm,cffps1" }, 419 {} 420 }; 421 MODULE_DEVICE_TABLE(of, ibm_cffps_of_match); 422 423 static struct i2c_driver ibm_cffps_driver = { 424 .driver = { 425 .name = "ibm-cffps", 426 .of_match_table = ibm_cffps_of_match, 427 }, 428 .probe = ibm_cffps_probe, 429 .remove = pmbus_do_remove, 430 .id_table = ibm_cffps_id, 431 }; 432 433 module_i2c_driver(ibm_cffps_driver); 434 435 MODULE_AUTHOR("Eddie James"); 436 MODULE_DESCRIPTION("PMBus driver for IBM Common Form Factor power supplies"); 437 MODULE_LICENSE("GPL"); 438