linux-imx

/*

 * Hardware monitoring driver for Maxim MAX6621

 *

 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.

 * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>

 *

 * 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.

 */

​

#include <linux/bitops.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/regmap.h>

​

#define MAX6621_DRV_NAME        "max6621"

#define MAX6621_TEMP_INPUT_REG_NUM  9

#define MAX6621_TEMP_INPUT_MIN      -127000

#define MAX6621_TEMP_INPUT_MAX      128000

#define MAX6621_TEMP_ALERT_CHAN_SHIFT   1

​

#define MAX6621_TEMP_S0D0_REG       0x00

#define MAX6621_TEMP_S0D1_REG       0x01

#define MAX6621_TEMP_S1D0_REG       0x02

#define MAX6621_TEMP_S1D1_REG       0x03

#define MAX6621_TEMP_S2D0_REG       0x04

#define MAX6621_TEMP_S2D1_REG       0x05

#define MAX6621_TEMP_S3D0_REG       0x06

#define MAX6621_TEMP_S3D1_REG       0x07

#define MAX6621_TEMP_MAX_REG        0x08

#define MAX6621_TEMP_MAX_ADDR_REG   0x0a

#define MAX6621_TEMP_ALERT_CAUSE_REG    0x0b

#define MAX6621_CONFIG0_REG     0x0c

#define MAX6621_CONFIG1_REG     0x0d

#define MAX6621_CONFIG2_REG     0x0e

#define MAX6621_CONFIG3_REG     0x0f

#define MAX6621_TEMP_S0_ALERT_REG   0x10

#define MAX6621_TEMP_S1_ALERT_REG   0x11

#define MAX6621_TEMP_S2_ALERT_REG   0x12

#define MAX6621_TEMP_S3_ALERT_REG   0x13

#define MAX6621_CLEAR_ALERT_REG     0x15

#define MAX6621_REG_MAX         (MAX6621_CLEAR_ALERT_REG + 1)

#define MAX6621_REG_TEMP_SHIFT      0x06

​

#define MAX6621_ENABLE_TEMP_ALERTS_BIT  4

#define MAX6621_ENABLE_I2C_CRC_BIT  5

#define MAX6621_ENABLE_ALTERNATE_DATA   6

#define MAX6621_ENABLE_LOCKUP_TO    7

#define MAX6621_ENABLE_S0D0_BIT     8

#define MAX6621_ENABLE_S3D1_BIT     15

#define MAX6621_ENABLE_TEMP_ALL     GENMASK(MAX6621_ENABLE_S3D1_BIT, \

                        MAX6621_ENABLE_S0D0_BIT)

#define MAX6621_POLL_DELAY_MASK     0x5

#define MAX6621_CONFIG0_INIT        (MAX6621_ENABLE_TEMP_ALL | \

                     BIT(MAX6621_ENABLE_LOCKUP_TO) | \

                     BIT(MAX6621_ENABLE_I2C_CRC_BIT) | \

                     MAX6621_POLL_DELAY_MASK)

#define MAX6621_PECI_BIT_TIME       0x2

#define MAX6621_PECI_RETRY_NUM      0x3

#define MAX6621_CONFIG1_INIT        ((MAX6621_PECI_BIT_TIME << 8) | \

                     MAX6621_PECI_RETRY_NUM)

​

/* Error codes */

#define MAX6621_TRAN_FAILED 0x8100  /*

                     * PECI transaction failed for more

                     * than the configured number of

                     * consecutive retries.

                     */

#define MAX6621_POOL_DIS    0x8101  /*

                     * Polling disabled for requested

                     * socket/domain.

                     */

#define MAX6621_POOL_UNCOMPLETE 0x8102  /*

                     * First poll not yet completed for

                     * requested socket/domain (on

                     * startup).

                     */

#define MAX6621_SD_DIS      0x8103  /*

                     * Read maximum temperature requested,

                     * but no sockets/domains enabled or

                     * all enabled sockets/domains have