174ba9207SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
29d2ecfb7SGuenter Roeck /*
39d2ecfb7SGuenter Roeck * Hardware monitoring driver for ucd9200 series Digital PWM System Controllers
49d2ecfb7SGuenter Roeck *
59d2ecfb7SGuenter Roeck * Copyright (C) 2011 Ericsson AB.
69d2ecfb7SGuenter Roeck */
79d2ecfb7SGuenter Roeck
89d2ecfb7SGuenter Roeck #include <linux/kernel.h>
99d2ecfb7SGuenter Roeck #include <linux/module.h>
1039f03438SRob Herring #include <linux/of.h>
119d2ecfb7SGuenter Roeck #include <linux/init.h>
129d2ecfb7SGuenter Roeck #include <linux/err.h>
139d2ecfb7SGuenter Roeck #include <linux/slab.h>
149d2ecfb7SGuenter Roeck #include <linux/i2c.h>
154ba1bb12SWolfram Sang #include <linux/pmbus.h>
169d2ecfb7SGuenter Roeck #include "pmbus.h"
179d2ecfb7SGuenter Roeck
189d2ecfb7SGuenter Roeck #define UCD9200_PHASE_INFO 0xd2
199d2ecfb7SGuenter Roeck #define UCD9200_DEVICE_ID 0xfd
209d2ecfb7SGuenter Roeck
219d2ecfb7SGuenter Roeck enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246,
229d2ecfb7SGuenter Roeck ucd9248 };
239d2ecfb7SGuenter Roeck
249d2ecfb7SGuenter Roeck static const struct i2c_device_id ucd9200_id[] = {
259d2ecfb7SGuenter Roeck {"ucd9200", ucd9200},
269d2ecfb7SGuenter Roeck {"ucd9220", ucd9220},
279d2ecfb7SGuenter Roeck {"ucd9222", ucd9222},
289d2ecfb7SGuenter Roeck {"ucd9224", ucd9224},
299d2ecfb7SGuenter Roeck {"ucd9240", ucd9240},
309d2ecfb7SGuenter Roeck {"ucd9244", ucd9244},
319d2ecfb7SGuenter Roeck {"ucd9246", ucd9246},
329d2ecfb7SGuenter Roeck {"ucd9248", ucd9248},
339d2ecfb7SGuenter Roeck {}
349d2ecfb7SGuenter Roeck };
359d2ecfb7SGuenter Roeck MODULE_DEVICE_TABLE(i2c, ucd9200_id);
369d2ecfb7SGuenter Roeck
379c6b0f75SGuenter Roeck static const struct of_device_id __maybe_unused ucd9200_of_match[] = {
3802331c3aSJavier Martinez Canillas {
3902331c3aSJavier Martinez Canillas .compatible = "ti,cd9200",
4002331c3aSJavier Martinez Canillas .data = (void *)ucd9200
4102331c3aSJavier Martinez Canillas },
4202331c3aSJavier Martinez Canillas {
4302331c3aSJavier Martinez Canillas .compatible = "ti,cd9220",
4402331c3aSJavier Martinez Canillas .data = (void *)ucd9220
4502331c3aSJavier Martinez Canillas },
4602331c3aSJavier Martinez Canillas {
4702331c3aSJavier Martinez Canillas .compatible = "ti,cd9222",
4802331c3aSJavier Martinez Canillas .data = (void *)ucd9222
4902331c3aSJavier Martinez Canillas },
5002331c3aSJavier Martinez Canillas {
5102331c3aSJavier Martinez Canillas .compatible = "ti,cd9224",
5202331c3aSJavier Martinez Canillas .data = (void *)ucd9224
5302331c3aSJavier Martinez Canillas },
5402331c3aSJavier Martinez Canillas {
5502331c3aSJavier Martinez Canillas .compatible = "ti,cd9240",
5602331c3aSJavier Martinez Canillas .data = (void *)ucd9240
5702331c3aSJavier Martinez Canillas },
5802331c3aSJavier Martinez Canillas {
5902331c3aSJavier Martinez Canillas .compatible = "ti,cd9244",
6002331c3aSJavier Martinez Canillas .data = (void *)ucd9244
6102331c3aSJavier Martinez Canillas },
6202331c3aSJavier Martinez Canillas {
6302331c3aSJavier Martinez Canillas .compatible = "ti,cd9246",
6402331c3aSJavier Martinez Canillas .data = (void *)ucd9246
6502331c3aSJavier Martinez Canillas },
6602331c3aSJavier Martinez Canillas {
6702331c3aSJavier Martinez Canillas .compatible = "ti,cd9248",
6802331c3aSJavier Martinez Canillas .data = (void *)ucd9248
6902331c3aSJavier Martinez Canillas },
7002331c3aSJavier Martinez Canillas { },
7102331c3aSJavier Martinez Canillas };
7202331c3aSJavier Martinez Canillas MODULE_DEVICE_TABLE(of, ucd9200_of_match);
7302331c3aSJavier Martinez Canillas
ucd9200_probe(struct i2c_client * client)74dd431939SStephen Kitt static int ucd9200_probe(struct i2c_client *client)
759d2ecfb7SGuenter Roeck {
769d2ecfb7SGuenter Roeck u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
779d2ecfb7SGuenter Roeck struct pmbus_driver_info *info;
789d2ecfb7SGuenter Roeck const struct i2c_device_id *mid;
7902331c3aSJavier Martinez Canillas enum chips chip;
809d2ecfb7SGuenter Roeck int i, j, ret;
819d2ecfb7SGuenter Roeck
829d2ecfb7SGuenter Roeck if (!i2c_check_functionality(client->adapter,
839d2ecfb7SGuenter Roeck I2C_FUNC_SMBUS_BYTE_DATA |
849d2ecfb7SGuenter Roeck I2C_FUNC_SMBUS_BLOCK_DATA))
859d2ecfb7SGuenter Roeck return -ENODEV;
869d2ecfb7SGuenter Roeck
879d2ecfb7SGuenter Roeck ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID,
889d2ecfb7SGuenter Roeck block_buffer);
899d2ecfb7SGuenter Roeck if (ret < 0) {
909d2ecfb7SGuenter Roeck dev_err(&client->dev, "Failed to read device ID\n");
919d2ecfb7SGuenter Roeck return ret;
929d2ecfb7SGuenter Roeck }
939d2ecfb7SGuenter Roeck block_buffer[ret] = '\0';
949d2ecfb7SGuenter Roeck dev_info(&client->dev, "Device ID %s\n", block_buffer);
959d2ecfb7SGuenter Roeck
96f020b007SJean Delvare for (mid = ucd9200_id; mid->name[0]; mid++) {
979d2ecfb7SGuenter Roeck if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
989d2ecfb7SGuenter Roeck break;
999d2ecfb7SGuenter Roeck }
100f020b007SJean Delvare if (!mid->name[0]) {
1019d2ecfb7SGuenter Roeck dev_err(&client->dev, "Unsupported device\n");
1029d2ecfb7SGuenter Roeck return -ENODEV;
1039d2ecfb7SGuenter Roeck }
10402331c3aSJavier Martinez Canillas
10502331c3aSJavier Martinez Canillas if (client->dev.of_node)
106*1030892cSKrzysztof Kozlowski chip = (uintptr_t)of_device_get_match_data(&client->dev);
10702331c3aSJavier Martinez Canillas else
108dd431939SStephen Kitt chip = mid->driver_data;
10902331c3aSJavier Martinez Canillas
110dd431939SStephen Kitt if (chip != ucd9200 && strcmp(client->name, mid->name) != 0)
1119d2ecfb7SGuenter Roeck dev_notice(&client->dev,
1129d2ecfb7SGuenter Roeck "Device mismatch: Configured %s, detected %s\n",
113dd431939SStephen Kitt client->name, mid->name);
1149d2ecfb7SGuenter Roeck
1158b313ca7SGuenter Roeck info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
1168b313ca7SGuenter Roeck GFP_KERNEL);
1179d2ecfb7SGuenter Roeck if (!info)
1189d2ecfb7SGuenter Roeck return -ENOMEM;
1199d2ecfb7SGuenter Roeck
1209d2ecfb7SGuenter Roeck ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO,
1219d2ecfb7SGuenter Roeck block_buffer);
1229d2ecfb7SGuenter Roeck if (ret < 0) {
1239d2ecfb7SGuenter Roeck dev_err(&client->dev, "Failed to read phase information\n");
1248b313ca7SGuenter Roeck return ret;
1259d2ecfb7SGuenter Roeck }
1269d2ecfb7SGuenter Roeck
1279d2ecfb7SGuenter Roeck /*
1289d2ecfb7SGuenter Roeck * Calculate number of configured pages (rails) from PHASE_INFO
1299d2ecfb7SGuenter Roeck * register.
1309d2ecfb7SGuenter Roeck * Rails have to be sequential, so we can abort after finding
1319d2ecfb7SGuenter Roeck * the first unconfigured rail.
1329d2ecfb7SGuenter Roeck */
1339d2ecfb7SGuenter Roeck info->pages = 0;
1349d2ecfb7SGuenter Roeck for (i = 0; i < ret; i++) {
1359d2ecfb7SGuenter Roeck if (!block_buffer[i])
1369d2ecfb7SGuenter Roeck break;
1379d2ecfb7SGuenter Roeck info->pages++;
1389d2ecfb7SGuenter Roeck }
1399d2ecfb7SGuenter Roeck if (!info->pages) {
1409d2ecfb7SGuenter Roeck dev_err(&client->dev, "No rails configured\n");
1418b313ca7SGuenter Roeck return -ENODEV;
1429d2ecfb7SGuenter Roeck }
1439d2ecfb7SGuenter Roeck dev_info(&client->dev, "%d rails configured\n", info->pages);
1449d2ecfb7SGuenter Roeck
1459d2ecfb7SGuenter Roeck /*
1469d2ecfb7SGuenter Roeck * Set PHASE registers on all pages to 0xff to ensure that phase
1479d2ecfb7SGuenter Roeck * specific commands will apply to all phases of a given page (rail).
1489d2ecfb7SGuenter Roeck * This only affects the READ_IOUT and READ_TEMPERATURE2 registers.
1499d2ecfb7SGuenter Roeck * READ_IOUT will return the sum of currents of all phases of a rail,
1509d2ecfb7SGuenter Roeck * and READ_TEMPERATURE2 will return the maximum temperature detected
151f0aa153bSJiang Jian * for the phases of the rail.
1529d2ecfb7SGuenter Roeck */
1539d2ecfb7SGuenter Roeck for (i = 0; i < info->pages; i++) {
1549d2ecfb7SGuenter Roeck /*
1559d2ecfb7SGuenter Roeck * Setting PAGE & PHASE fails once in a while for no obvious
1569d2ecfb7SGuenter Roeck * reason, so we need to retry a couple of times.
1579d2ecfb7SGuenter Roeck */
1589d2ecfb7SGuenter Roeck for (j = 0; j < 3; j++) {
1599d2ecfb7SGuenter Roeck ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
1609d2ecfb7SGuenter Roeck if (ret < 0)
1619d2ecfb7SGuenter Roeck continue;
1629d2ecfb7SGuenter Roeck ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
1639d2ecfb7SGuenter Roeck 0xff);
1649d2ecfb7SGuenter Roeck if (ret < 0)
1659d2ecfb7SGuenter Roeck continue;
1669d2ecfb7SGuenter Roeck break;
1679d2ecfb7SGuenter Roeck }
1689d2ecfb7SGuenter Roeck if (ret < 0) {
1699d2ecfb7SGuenter Roeck dev_err(&client->dev,
1709d2ecfb7SGuenter Roeck "Failed to initialize PHASE registers\n");
1718b313ca7SGuenter Roeck return ret;
1729d2ecfb7SGuenter Roeck }
1739d2ecfb7SGuenter Roeck }
1749d2ecfb7SGuenter Roeck if (info->pages > 1)
1759d2ecfb7SGuenter Roeck i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
1769d2ecfb7SGuenter Roeck
1779d2ecfb7SGuenter Roeck info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT |
1789d2ecfb7SGuenter Roeck PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
1799d2ecfb7SGuenter Roeck PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
1809d2ecfb7SGuenter Roeck PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
1819d2ecfb7SGuenter Roeck PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP |
1829d2ecfb7SGuenter Roeck PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
1839d2ecfb7SGuenter Roeck
1849d2ecfb7SGuenter Roeck for (i = 1; i < info->pages; i++)
1859d2ecfb7SGuenter Roeck info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
1869d2ecfb7SGuenter Roeck PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
1879d2ecfb7SGuenter Roeck PMBUS_HAVE_POUT |
1889d2ecfb7SGuenter Roeck PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
1899d2ecfb7SGuenter Roeck
1909d2ecfb7SGuenter Roeck /* ucd9240 supports a single fan */
1919d2ecfb7SGuenter Roeck if (mid->driver_data == ucd9240)
1929d2ecfb7SGuenter Roeck info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12;
1939d2ecfb7SGuenter Roeck
194dd431939SStephen Kitt return pmbus_do_probe(client, info);
1959d2ecfb7SGuenter Roeck }
1969d2ecfb7SGuenter Roeck
1979d2ecfb7SGuenter Roeck /* This is the driver that will be inserted */
1989d2ecfb7SGuenter Roeck static struct i2c_driver ucd9200_driver = {
1999d2ecfb7SGuenter Roeck .driver = {
2009d2ecfb7SGuenter Roeck .name = "ucd9200",
20102331c3aSJavier Martinez Canillas .of_match_table = of_match_ptr(ucd9200_of_match),
2029d2ecfb7SGuenter Roeck },
2031975d167SUwe Kleine-König .probe = ucd9200_probe,
2049d2ecfb7SGuenter Roeck .id_table = ucd9200_id,
2059d2ecfb7SGuenter Roeck };
2069d2ecfb7SGuenter Roeck
207f0967eeaSAxel Lin module_i2c_driver(ucd9200_driver);
2089d2ecfb7SGuenter Roeck
2099d2ecfb7SGuenter Roeck MODULE_AUTHOR("Guenter Roeck");
2109d2ecfb7SGuenter Roeck MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x");
2119d2ecfb7SGuenter Roeck MODULE_LICENSE("GPL");
212b94ca77eSGuenter Roeck MODULE_IMPORT_NS(PMBUS);
213