path: root/drivers/hwmon/emc1403.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * emc1403.c - SMSC Thermal Driver
 *
 * Copyright (C) 2008 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>

#define THERMAL_PID_REG		0xfd
#define THERMAL_SMSC_ID_REG	0xfe
#define THERMAL_REVISION_REG	0xff

enum emc1403_chip { emc1402, emc1403, emc1404, emc1428 };

struct thermal_data {
	enum emc1403_chip chip;
	struct regmap *regmap;
	struct mutex mutex;
};

static ssize_t power_state_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_data *data = dev_get_drvdata(dev);
	unsigned int val;
	int retval;

	retval = regmap_read(data->regmap, 0x03, &val);
	if (retval < 0)
		return retval;
	return sprintf(buf, "%d\n", !!(val & BIT(6)));
}

static ssize_t power_state_store(struct device *dev, struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct thermal_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int retval;

	if (kstrtoul(buf, 10, &val))
		return -EINVAL;

	retval = regmap_update_bits(data->regmap, 0x03, BIT(6),
				    val ? BIT(6) : 0);
	if (retval < 0)
		return retval;
	return count;
}

static DEVICE_ATTR_RW(power_state);

static struct attribute *emc1403_attrs[] = {
	&dev_attr_power_state.attr,
	NULL
};
ATTRIBUTE_GROUPS(emc1403);

static int emc1403_detect(struct i2c_client *client,
			struct i2c_board_info *info)
{
	int id;
	/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */

	id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
	if (id != 0x5d)
		return -ENODEV;

	id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
	switch (id) {
	case 0x20:
		strscpy(info->type, "emc1402", I2C_NAME_SIZE);
		break;
	case 0x21:
		strscpy(info->type, "emc1403", I2C_NAME_SIZE);
		break;
	case 0x22:
		strscpy(info->type, "emc1422", I2C_NAME_SIZE);
		break;
	case 0x23:
		strscpy(info->type, "emc1423", I2C_NAME_SIZE);
		break;
	case 0x25:
		strscpy(info->type, "emc1404", I2C_NAME_SIZE);
		break;
	case 0x27:
		strscpy(info->type, "emc1424", I2C_NAME_SIZE);
		break;
	case 0x29:
		strscpy(info->type, "emc1428", I2C_NAME_SIZE);
		break;
	case 0x59:
		strscpy(info->type, "emc1438", I2C_NAME_SIZE);
		break;
	case 0x60:
		strscpy(info->type, "emc1442", I2C_NAME_SIZE);
		break;
	default:
		return -ENODEV;
	}

	id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
	if (id < 0x01 || id > 0x04)
		return -ENODEV;

	return 0;
}

static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x00:	/* internal diode high byte */
	case 0x01:	/* external diode 1 high byte */
	case 0x02:	/* status */
	case 0x10:	/* external diode 1 low byte */
	case 0x1b:	/* external diode fault */
	case 0x23:	/* external diode 2 high byte */
	case 0x24:	/* external diode 2 low byte */
	case 0x29:	/* internal diode low byte */
	case 0x2a:	/* externl diode 3 high byte */
	case 0x2b:	/* external diode 3 low byte */
	case 0x35:	/* high limit status */
	case 0x36:	/* low limit status */
	case 0x37:	/* therm limit status */
	case 0x41:	/* external diode 4 high byte */
	case 0x42:	/* external diode 4 low byte */
	case 0x43:	/* external diode 5 high byte */
	case 0x44:	/* external diode 5 low byte */
	case 0x45:	/* external diode 6 high byte */
	case 0x46:	/* external diode 6 low byte */
	case 0x47:	/* external diode 7 high byte */
	case 0x48:	/* external diode 7 low byte */
		return true;
	default:
		return false;
	}
}

static const struct regmap_config emc1403_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.cache_type = REGCACHE_MAPLE,
	.volatile_reg = emc1403_regmap_is_volatile,
};

enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};

static u8 ema1403_temp_map[] = {
	[hwmon_temp_min] = temp_min,
	[hwmon_temp_max] = temp_max,
	[hwmon_temp_crit] = temp_crit,
	[hwmon_temp_input] = temp_input,
};

static u8 emc1403_temp_regs[][4] = {
	[0] = {
		[temp_min] = 0x06,
		[temp_max] = 0x05,
		[temp_crit] = 0x20,
		[temp_input] = 0x00,
	},
	[1] = {
		[temp_min] = 0x08,
		[temp_max] = 0x07,
		[temp_crit] = 0x19,
		[temp_input] = 0x01,
	},
	[2] = {
		[temp_min] = 0x16,
		[temp_max] = 0x15,
		[temp_crit] = 0x1a,
		[temp_input] = 0x23,
	},
	[3] = {
		[temp_min] = 0x2d,
		[temp_max] = 0x2c,
		[temp_crit] = 0x30,
		[temp_input] = 0x2a,
	},
	[4] = {
		[temp_min] = 0x51,
		[temp_max] = 0x50,
		[temp_crit] = 0x64,
		[temp_input] = 0x41,
	},
	[5] = {
		[temp_min] = 0x55,
		[temp_max] = 0x54,
		[temp_crit] = 0x65,
		[temp_input] = 0x43
	},
	[6] = {
		[temp_min] = 0x59,
		[temp_max] = 0x58,
		[temp_crit] = 0x66,
		[temp_input] = 0x45,
	},
	[7] = {
		[temp_min] = 0x5d,
		[temp_max] = 0x5c,
		[temp_crit] = 0x67,
		[temp_input] = 0x47,
	},
};

static s8 emc1403_temp_regs_low[][4] = {
	[0] = {
		[temp_min] = -1,
		[temp_max] = -1,
		[temp_crit] = -1,
		[temp_input] = 0x29,
	},
	[1] = {
		[temp_min] = 0x14,
		[temp_max] = 0x13,
		[temp_crit] = -1,
		[temp_input] = 0x10,
	},
	[2] = {
		[temp_min] = 0x18,
		[temp_max] = 0x17,
		[temp_crit] = -1,
		[temp_input] = 0x24,
	},
	[3] = {
		[temp_min] = 0x2f,
		[temp_max] = 0x2e,
		[temp_crit] = -1,
		[temp_input] = 0x2b,
	},
	[4] = {
		[temp_min] = 0x53,
		[temp_max] = 0x52,
		[temp_crit] = -1,
		[temp_input] = 0x42,
	},
	[5] = {
		[temp_min] = 0x57,
		[temp_max] = 0x56,
		[temp_crit] = -1,
		[temp_input] = 0x44,
	},
	[6] = {
		[temp_min] = 0x5b,
		[temp_max]