linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Driver for Lineage Compact Power Line series of power entry modules.

 *

 * Copyright (C) 2010, 2011 Ericsson AB.

 *

 * Documentation:

 *  http://www.lineagepower.com/oem/pdf/CPLI2C.pdf

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/jiffies.h>

​

/*

 * This driver supports various Lineage Compact Power Line DC/DC and AC/DC

 * converters such as CP1800, CP2000AC, CP2000DC, CP2100DC, and others.

 *

 * The devices are nominally PMBus compliant. However, most standard PMBus

 * commands are not supported. Specifically, all hardware monitoring and

 * status reporting commands are non-standard. For this reason, a standard

 * PMBus driver can not be used.

 *

 * All Lineage CPL devices have a built-in I2C bus master selector (PCA9541).

 * To ensure device access, this driver should only be used as client driver

 * to the pca9541 I2C master selector driver.

 */

​

/* Command codes */

#define PEM_OPERATION       0x01

#define PEM_CLEAR_INFO_FLAGS    0x03

#define PEM_VOUT_COMMAND    0x21

#define PEM_VOUT_OV_FAULT_LIMIT 0x40

#define PEM_READ_DATA_STRING    0xd0

#define PEM_READ_INPUT_STRING   0xdc

#define PEM_READ_FIRMWARE_REV   0xdd

#define PEM_READ_RUN_TIMER  0xde

#define PEM_FAN_HI_SPEED    0xdf

#define PEM_FAN_NORMAL_SPEED    0xe0

#define PEM_READ_FAN_SPEED  0xe1

​

/* offsets in data string */

#define PEM_DATA_STATUS_2   0

#define PEM_DATA_STATUS_1   1

#define PEM_DATA_ALARM_2    2

#define PEM_DATA_ALARM_1    3

#define PEM_DATA_VOUT_LSB   4

#define PEM_DATA_VOUT_MSB   5

#define PEM_DATA_CURRENT    6

#define PEM_DATA_TEMP       7

​

/* Virtual entries, to report constants */

#define PEM_DATA_TEMP_MAX   10

#define PEM_DATA_TEMP_CRIT  11

​

/* offsets in input string */

#define PEM_INPUT_VOLTAGE   0

#define PEM_INPUT_POWER_LSB 1

#define PEM_INPUT_POWER_MSB 2

​

/* offsets in fan data */

#define PEM_FAN_ADJUSTMENT  0

#define PEM_FAN_FAN1        1

#define PEM_FAN_FAN2        2

#define PEM_FAN_FAN3        3

​

/* Status register bits */

#define STS1_OUTPUT_ON      (1 << 0)

#define STS1_LEDS_FLASHING  (1 << 1)

#define STS1_EXT_FAULT      (1 << 2)

#define STS1_SERVICE_LED_ON (1 << 3)

#define STS1_SHUTDOWN_OCCURRED  (1 << 4)

#define STS1_INT_FAULT      (1 << 5)

#define STS1_ISOLATION_TEST_OK  (1 << 6)

​

#define STS2_ENABLE_PIN_HI  (1 << 0)

#define STS2_DATA_OUT_RANGE (1 << 1)

#define STS2_RESTARTED_OK   (1 << 1)

#define STS2_ISOLATION_TEST_FAIL (1 << 3)

#define STS2_HIGH_POWER_CAP (1 << 4)

#define STS2_INVALID_INSTR  (1 << 5)

#define STS2_WILL_RESTART   (1 << 6)

#define STS2_PEC_ERR        (1 << 7)

​

/* Alarm register bits */

#define ALRM1_VIN_OUT_LIMIT (1 << 0)