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212 lines
5.2 KiB
212 lines
5.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Hardware monitoring driver for ucd9200 series Digital PWM System Controllers |
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* |
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* Copyright (C) 2011 Ericsson AB. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/init.h> |
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#include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/pmbus.h> |
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#include "pmbus.h" |
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#define UCD9200_PHASE_INFO 0xd2 |
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#define UCD9200_DEVICE_ID 0xfd |
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enum chips { ucd9200, ucd9220, ucd9222, ucd9224, ucd9240, ucd9244, ucd9246, |
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ucd9248 }; |
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static const struct i2c_device_id ucd9200_id[] = { |
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{"ucd9200", ucd9200}, |
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{"ucd9220", ucd9220}, |
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{"ucd9222", ucd9222}, |
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{"ucd9224", ucd9224}, |
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{"ucd9240", ucd9240}, |
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{"ucd9244", ucd9244}, |
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{"ucd9246", ucd9246}, |
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{"ucd9248", ucd9248}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, ucd9200_id); |
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static const struct of_device_id __maybe_unused ucd9200_of_match[] = { |
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{ |
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.compatible = "ti,cd9200", |
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.data = (void *)ucd9200 |
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}, |
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{ |
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.compatible = "ti,cd9220", |
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.data = (void *)ucd9220 |
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}, |
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{ |
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.compatible = "ti,cd9222", |
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.data = (void *)ucd9222 |
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}, |
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{ |
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.compatible = "ti,cd9224", |
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.data = (void *)ucd9224 |
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}, |
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{ |
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.compatible = "ti,cd9240", |
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.data = (void *)ucd9240 |
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}, |
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{ |
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.compatible = "ti,cd9244", |
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.data = (void *)ucd9244 |
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}, |
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{ |
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.compatible = "ti,cd9246", |
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.data = (void *)ucd9246 |
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}, |
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{ |
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.compatible = "ti,cd9248", |
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.data = (void *)ucd9248 |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, ucd9200_of_match); |
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static int ucd9200_probe(struct i2c_client *client) |
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{ |
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u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; |
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struct pmbus_driver_info *info; |
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const struct i2c_device_id *mid; |
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enum chips chip; |
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int i, j, ret; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_BYTE_DATA | |
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I2C_FUNC_SMBUS_BLOCK_DATA)) |
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return -ENODEV; |
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ret = i2c_smbus_read_block_data(client, UCD9200_DEVICE_ID, |
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block_buffer); |
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if (ret < 0) { |
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dev_err(&client->dev, "Failed to read device ID\n"); |
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return ret; |
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} |
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block_buffer[ret] = '\0'; |
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dev_info(&client->dev, "Device ID %s\n", block_buffer); |
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for (mid = ucd9200_id; mid->name[0]; mid++) { |
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if (!strncasecmp(mid->name, block_buffer, strlen(mid->name))) |
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break; |
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} |
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if (!mid->name[0]) { |
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dev_err(&client->dev, "Unsupported device\n"); |
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return -ENODEV; |
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} |
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if (client->dev.of_node) |
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chip = (enum chips)of_device_get_match_data(&client->dev); |
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else |
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chip = mid->driver_data; |
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if (chip != ucd9200 && strcmp(client->name, mid->name) != 0) |
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dev_notice(&client->dev, |
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"Device mismatch: Configured %s, detected %s\n", |
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client->name, mid->name); |
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info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info), |
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GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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ret = i2c_smbus_read_block_data(client, UCD9200_PHASE_INFO, |
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block_buffer); |
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if (ret < 0) { |
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dev_err(&client->dev, "Failed to read phase information\n"); |
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return ret; |
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} |
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/* |
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* Calculate number of configured pages (rails) from PHASE_INFO |
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* register. |
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* Rails have to be sequential, so we can abort after finding |
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* the first unconfigured rail. |
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*/ |
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info->pages = 0; |
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for (i = 0; i < ret; i++) { |
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if (!block_buffer[i]) |
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break; |
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info->pages++; |
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} |
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if (!info->pages) { |
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dev_err(&client->dev, "No rails configured\n"); |
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return -ENODEV; |
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} |
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dev_info(&client->dev, "%d rails configured\n", info->pages); |
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/* |
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* Set PHASE registers on all pages to 0xff to ensure that phase |
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* specific commands will apply to all phases of a given page (rail). |
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* This only affects the READ_IOUT and READ_TEMPERATURE2 registers. |
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* READ_IOUT will return the sum of currents of all phases of a rail, |
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* and READ_TEMPERATURE2 will return the maximum temperature detected |
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* for the the phases of the rail. |
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*/ |
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for (i = 0; i < info->pages; i++) { |
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/* |
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* Setting PAGE & PHASE fails once in a while for no obvious |
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* reason, so we need to retry a couple of times. |
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*/ |
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for (j = 0; j < 3; j++) { |
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ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i); |
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if (ret < 0) |
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continue; |
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ret = i2c_smbus_write_byte_data(client, PMBUS_PHASE, |
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0xff); |
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if (ret < 0) |
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continue; |
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break; |
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} |
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if (ret < 0) { |
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dev_err(&client->dev, |
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"Failed to initialize PHASE registers\n"); |
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return ret; |
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} |
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} |
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if (info->pages > 1) |
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i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); |
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info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | |
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PMBUS_HAVE_IIN | PMBUS_HAVE_PIN | |
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PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
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PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
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for (i = 1; i < info->pages; i++) |
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info->func[i] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | |
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PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT | |
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PMBUS_HAVE_POUT | |
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PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP; |
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/* ucd9240 supports a single fan */ |
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if (mid->driver_data == ucd9240) |
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info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12; |
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return pmbus_do_probe(client, info); |
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} |
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/* This is the driver that will be inserted */ |
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static struct i2c_driver ucd9200_driver = { |
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.driver = { |
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.name = "ucd9200", |
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.of_match_table = of_match_ptr(ucd9200_of_match), |
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}, |
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.probe_new = ucd9200_probe, |
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.id_table = ucd9200_id, |
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}; |
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module_i2c_driver(ucd9200_driver); |
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MODULE_AUTHOR("Guenter Roeck"); |
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MODULE_DESCRIPTION("PMBus driver for TI UCD922x, UCD924x"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(PMBUS);
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