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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
213 lines
5.2 KiB
C
213 lines
5.2 KiB
C
// 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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const struct i2c_device_id *id)
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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 = id->driver_data;
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if (chip != ucd9200 && chip != mid->driver_data)
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dev_notice(&client->dev,
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"Device mismatch: Configured %s, detected %s\n",
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id->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, mid, 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 = ucd9200_probe,
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.remove = pmbus_do_remove,
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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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