[linux-2.6-block.git] / drivers / hwmon / tps23861.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2020 Sartura Ltd.
 *
 * Driver for the TI TPS23861 PoE PSE.
 *
 * Author: Robert Marko <robert.marko@sartura.hr>
 */

#include <linux/bitfield.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>

#define TEMPERATURE			0x2c
#define INPUT_VOLTAGE_LSB		0x2e
#define INPUT_VOLTAGE_MSB		0x2f
#define PORT_1_CURRENT_LSB		0x30
#define PORT_1_CURRENT_MSB		0x31
#define PORT_1_VOLTAGE_LSB		0x32
#define PORT_1_VOLTAGE_MSB		0x33
#define PORT_2_CURRENT_LSB		0x34
#define PORT_2_CURRENT_MSB		0x35
#define PORT_2_VOLTAGE_LSB		0x36
#define PORT_2_VOLTAGE_MSB		0x37
#define PORT_3_CURRENT_LSB		0x38
#define PORT_3_CURRENT_MSB		0x39
#define PORT_3_VOLTAGE_LSB		0x3a
#define PORT_3_VOLTAGE_MSB		0x3b
#define PORT_4_CURRENT_LSB		0x3c
#define PORT_4_CURRENT_MSB		0x3d
#define PORT_4_VOLTAGE_LSB		0x3e
#define PORT_4_VOLTAGE_MSB		0x3f
#define PORT_N_CURRENT_LSB_OFFSET	0x04
#define PORT_N_VOLTAGE_LSB_OFFSET	0x04
#define VOLTAGE_CURRENT_MASK		GENMASK(13, 0)
#define PORT_1_RESISTANCE_LSB		0x60
#define PORT_1_RESISTANCE_MSB		0x61
#define PORT_2_RESISTANCE_LSB		0x62
#define PORT_2_RESISTANCE_MSB		0x63
#define PORT_3_RESISTANCE_LSB		0x64
#define PORT_3_RESISTANCE_MSB		0x65
#define PORT_4_RESISTANCE_LSB		0x66
#define PORT_4_RESISTANCE_MSB		0x67
#define PORT_N_RESISTANCE_LSB_OFFSET	0x02
#define PORT_RESISTANCE_MASK		GENMASK(13, 0)
#define PORT_RESISTANCE_RSN_MASK	GENMASK(15, 14)
#define PORT_RESISTANCE_RSN_OTHER	0
#define PORT_RESISTANCE_RSN_LOW		1
#define PORT_RESISTANCE_RSN_OPEN	2
#define PORT_RESISTANCE_RSN_SHORT	3
#define PORT_1_STATUS			0x0c
#define PORT_2_STATUS			0x0d
#define PORT_3_STATUS			0x0e
#define PORT_4_STATUS			0x0f
#define PORT_STATUS_CLASS_MASK		GENMASK(7, 4)
#define PORT_STATUS_DETECT_MASK		GENMASK(3, 0)
#define PORT_CLASS_UNKNOWN		0
#define PORT_CLASS_1			1
#define PORT_CLASS_2			2
#define PORT_CLASS_3			3
#define PORT_CLASS_4			4
#define PORT_CLASS_RESERVED		5
#define PORT_CLASS_0			6
#define PORT_CLASS_OVERCURRENT		7
#define PORT_CLASS_MISMATCH		8
#define PORT_DETECT_UNKNOWN		0
#define PORT_DETECT_SHORT		1
#define PORT_DETECT_RESERVED		2
#define PORT_DETECT_RESISTANCE_LOW	3
#define PORT_DETECT_RESISTANCE_OK	4
#define PORT_DETECT_RESISTANCE_HIGH	5
#define PORT_DETECT_OPEN_CIRCUIT	6
#define PORT_DETECT_RESERVED_2		7
#define PORT_DETECT_MOSFET_FAULT	8
#define PORT_DETECT_LEGACY		9
/* Measurment beyond clamp voltage */
#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND	10
/* Insufficient voltage delta */
#define PORT_DETECT_CAPACITANCE_INVALID_DELTA	11
#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE	12
#define POE_PLUS			0x40
#define OPERATING_MODE			0x12
#define OPERATING_MODE_OFF		0
#define OPERATING_MODE_MANUAL		1
#define OPERATING_MODE_SEMI		2
#define OPERATING_MODE_AUTO		3
#define OPERATING_MODE_PORT_1_MASK	GENMASK(1, 0)
#define OPERATING_MODE_PORT_2_MASK	GENMASK(3, 2)
#define OPERATING_MODE_PORT_3_MASK	GENMASK(5, 4)
#define OPERATING_MODE_PORT_4_MASK	GENMASK(7, 6)

#define DETECT_CLASS_RESTART		0x18
#define POWER_ENABLE			0x19
#define TPS23861_NUM_PORTS		4

#define TEMPERATURE_LSB			652 /* 0.652 degrees Celsius */
#define VOLTAGE_LSB			3662 /* 3.662 mV */
#define SHUNT_RESISTOR_DEFAULT		255000 /* 255 mOhm */
#define CURRENT_LSB_255			62260 /* 62.260 uA */
#define CURRENT_LSB_250			61039 /* 61.039 uA */
#define RESISTANCE_LSB			110966 /* 11.0966 Ohm*/
#define RESISTANCE_LSB_LOW		157216 /* 15.7216 Ohm*/

struct tps23861_data {
	struct regmap *regmap;
	u32 shunt_resistor;
	struct i2c_client *client;
	struct dentry *debugfs_dir;
};

static struct regmap_config tps23861_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int tps23861_read_temp(struct tps23861_data *data, long *val)
{
	unsigned int regval;
	int err;

	err = regmap_read(data->regmap, TEMPERATURE, &regval);
	if (err < 0)
		return err;

	*val = (regval * TEMPERATURE_LSB) - 20000;

	return 0;
}

static int tps23861_read_voltage(struct tps23861_data *data, int channel,
				 long *val)
{
	unsigned int regval;
	int err;

	if (channel < TPS23861_NUM_PORTS) {
		err = regmap_bulk_read(data->regmap,
				       PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
				       &regval, 2);
	} else {
		err = regmap_bulk_read(data->regmap,
				       INPUT_VOLTAGE_LSB,
				       &regval, 2);
	}
	if (err < 0)
		return err;

	*val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000;

	return 0;
}

static int tps23861_read_current(struct tps23861_data *data, int channel,
				 long *val)
{
	unsigned int current_lsb;
	unsigned int regval;
	int err;

	if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
		current_lsb = CURRENT_LSB_255;
	else
		current_lsb = CURRENT_LSB_250;

	err = regmap_bulk_read(data->regmap,
			       PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
			       &regval, 2);
	if (err < 0)
		return err;

	*val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000;

	return 0;
}

static int tps23861_port_disable(struct tps23861_data *data, int channel)
{
	unsigned int regval = 0;
	int err;

	regval |= BIT(channel + 4);
	err = regmap_write(data->regmap, POWER_ENABLE, regval);

	return err;
}

static int tps23861_port_enable(struct tps23861_data *data, int channel)
{
	unsigned int regval = 0;
	int err;

	regval |= BIT(channel);
	regval |= BIT(channel + 4);
	err = regmap_write(data->regmap, DETECT_CLASS_RESTART, regval);

	return err;
}

static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
				   u32 attr, int channel)
{
	switch (type) {
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_input:
		case hwmon_temp_label:
			return 0444;
		default:
			return 0;
		}
	case hwmon_in:
		switch (attr) {
		case hwmon_in_input:
		case hwmon_in_label:
			return 0444;
		case hwmon_in_enable:
			return 0200;
		default:
			return 0;
		}
	case hwmon_curr:
		switch (attr) {
		case hwmon_curr_input:
		case hwmon_curr_label:
			return 0444;
		default:
			return 0;
		}
	default:
		return 0;
	}
}

static int tps23861_write(struct device *dev, enum hwmon_sensor_types type,
			  u32 attr, int channel, long val)
{
	struct tps23861_data *data = dev_get_drvdata(dev);
	int err;

	switch (type) {
	case hwmon_in:
		switch (attr) {
		case hwmon_in_enable:
			if (val == 0)
				err = tps23861_port_disable(data, channel);
			else if (val == 1)
				err = tps23861_port_enable(data, channel);
			else
				err = -EINVAL;
			break;
		default:
			return -EOPNOTSUPP;
		}
		break;
	default:
		return -EOPNOTSUPP;
	}

	return err;
}

static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
			 u32 attr, int channel, long *val)
{
	struct tps23861_data *data = dev_get_drvdata(dev);
	int err;

	switch (type) {
	case hwmon_temp:
		switch (attr) {
		case hwmon_temp_input:
			err = tps23861_read_temp(data, val);
			break;
		default:
			return -EOPNOTSUPP;
		}
		break;
	case hwmon_in:
		switch (attr) {
		case hwmon_in_input:
			err = tps23861_read_voltage(data, channel, val);
			break;
		default:
			return -EOPNOTSUPP;
		}
		break;
	case hwmon_curr:
		switch (attr) {
		case hwmon_curr_input:
			err = tps23861_read_current(data, channel, val);
			break;
		default:
			return -EOPNOTSUPP;
		}
		break;
	default:
		return -EOPNOTSUPP;
	}

	return err;
}

static const char * const tps23861_port_label[] = {
	"Port1",
	"Port2",
	"Port3",
	"Port4",
	"Input",
};

static int tps23861_read_string(struct device *dev,
				enum hwmon_sensor_types type,
				u32 attr, int channel, const char **str)
{
	switch (type) {
	case hwmon_in:
	case hwmon_curr:
		*str = tps23861_port_label[channel];
		break;
	case hwmon_temp:
		*str = "Die";
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static const struct hwmon_channel_info *tps23861_info[] = {
	HWMON_CHANNEL_INFO(chip,
			   HWMON_C_REGISTER_TZ),
	HWMON_CHANNEL_INFO(temp,
			   HWMON_T_INPUT | HWMON_T_LABEL),
	HWMON_CHANNEL_INFO(in,
			   HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
			   HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
			   HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
			   HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
			   HWMON_I_INPUT | HWMON_I_LABEL),
	HWMON_CHANNEL_INFO(curr,
			   HWMON_C_INPUT | HWMON_C_LABEL,
			   HWMON_C_INPUT | HWMON_C_LABEL,
			   HWMON_C_INPUT | HWMON_C_LABEL,
			   HWMON_C_INPUT | HWMON_C_LABEL),
	NULL
};

static const struct hwmon_ops tps23861_hwmon_ops = {
	.is_visible = tps23861_is_visible,
	.write = tps23861_write,
	.read = tps23861_read,
	.read_string = tps23861_read_string,
};

static const struct hwmon_chip_info tps23861_chip_info = {
	.ops = &tps23861_hwmon_ops,
	.info = tps23861_info,
};

static char *tps23861_port_operating_mode(struct tps23861_data *data, int port)
{
	unsigned int regval;
	int mode;

	regmap_read(data->regmap, OPERATING_MODE, &regval);

	switch (port) {
	case 1:
		mode = FIELD_GET(OPERATING_MODE_PORT_1_MASK, regval);
		break;
	case 2:
		mode = FIELD_GET(OPERATING_MODE_PORT_2_MASK, regval);
		break;
	case 3:
		mode = FIELD_GET(OPERATING_MODE_PORT_3_MASK, regval);
		break;
	case 4:
		mode = FIELD_GET(OPERATING_MODE_PORT_4_MASK, regval);
		break;
	default:
		mode = -EINVAL;
	}

	switch (mode) {
	case OPERATING_MODE_OFF:
		return "Off";
	case OPERATING_MODE_MANUAL:
		return "Manual";
	case OPERATING_MODE_SEMI:
		return "Semi-Auto";
	case OPERATING_MODE_AUTO:
		return "Auto";
	default:
		return "Invalid";
	}
}

static char *tps23861_port_detect_status(struct tps23861_data *data, int port)
{
	unsigned int regval;

	regmap_read(data->regmap,
		    PORT_1_STATUS + (port - 1),
		    &regval);

	switch (FIELD_GET(PORT_STATUS_DETECT_MASK, regval)) {
	case PORT_DETECT_UNKNOWN:
		return "Unknown device";
	case PORT_DETECT_SHORT:
		return "Short circuit";
	case PORT_DETECT_RESISTANCE_LOW:
		return "Too low resistance";
	case PORT_DETECT_RESISTANCE_OK:
		return "Valid resistance";
	case PORT_DETECT_RESISTANCE_HIGH:
		return "Too high resistance";
	case PORT_DETECT_OPEN_CIRCUIT:
		return "Open circuit";
	case PORT_DETECT_MOSFET_FAULT:
		return "MOSFET fault";
	case PORT_DETECT_LEGACY:
		return "Legacy device";
	case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
		return "Invalid capacitance, beyond clamp voltage";
	case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
		return "Invalid capacitance, insufficient voltage delta";
	case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
		return "Valid capacitance, outside of legacy range";
	case PORT_DETECT_RESERVED:
	case PORT_DETECT_RESERVED_2:
	default:
		return "Invalid";
	}
}

static char *tps23861_port_class_status(struct tps23861_data *data, int port)
{
	unsigned int regval;

	regmap_read(data->regmap,
		    PORT_1_STATUS + (port - 1),
		    &regval);

	switch (FIELD_GET(PORT_STATUS_CLASS_MASK, regval)) {
	case PORT_CLASS_UNKNOWN:
		return "Unknown";
	case PORT_CLASS_RESERVED:
	case PORT_CLASS_0:
		return "0";
	case PORT_CLASS_1:
		return "1";
	case PORT_CLASS_2:
		return "2";
	case PORT_CLASS_3:
		return "3";
	case PORT_CLASS_4:
		return "4";
	case PORT_CLASS_OVERCURRENT:
		return "Overcurrent";
	case PORT_CLASS_MISMATCH:
		return "Mismatch";
	default:
		return "Invalid";
	}
}

static char *tps23861_port_poe_plus_status(struct tps23861_data *data, int port)
{
	unsigned int regval;

	regmap_read(data->regmap, POE_PLUS, &regval);

	if (BIT(port + 3) & regval)
		return "Yes";
	else
		return "No";
}

static int tps23861_port_resistance(struct tps23861_data *data, int port)
{
	u16 regval;

	regmap_bulk_read(data->regmap,
			 PORT_1_RESISTANCE_LSB + PORT_N_RESISTANCE_LSB_OFFSET * (port - 1),
			 &regval,
			 2);

	switch (FIELD_GET(PORT_RESISTANCE_RSN_MASK, regval)) {
	case PORT_RESISTANCE_RSN_OTHER:
		return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB) / 10000;
	case PORT_RESISTANCE_RSN_LOW:
		return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB_LOW) / 10000;
	case PORT_RESISTANCE_RSN_SHORT:
	case PORT_RESISTANCE_RSN_OPEN:
	default:
		return 0;
	}
}

static int tps23861_port_status_show(struct seq_file *s, void *data)
{
	struct tps23861_data *priv = s->private;
	int i;

	for (i = 1; i < TPS23861_NUM_PORTS + 1; i++) {
		seq_printf(s, "Port: \t\t%d\n", i);
		seq_printf(s, "Operating mode: %s\n", tps23861_port_operating_mode(priv, i));
		seq_printf(s, "Detected: \t%s\n", tps23861_port_detect_status(priv, i));
		seq_printf(s, "Class: \t\t%s\n", tps23861_port_class_status(priv, i));
		seq_printf(s, "PoE Plus: \t%s\n", tps23861_port_poe_plus_status(priv, i));
		seq_printf(s, "Resistance: \t%d\n", tps23861_port_resistance(priv, i));
		seq_putc(s, '\n');
	}

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(tps23861_port_status);

static void tps23861_init_debugfs(struct tps23861_data *data)
{
	data->debugfs_dir = debugfs_create_dir(data->client->name, NULL);

	debugfs_create_file("port_status",
			    0400,
			    data->debugfs_dir,
			    data,
			    &tps23861_port_status_fops);
}

static int tps23861_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct tps23861_data *data;
	struct device *hwmon_dev;
	u32 shunt_resistor;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	i2c_set_clientdata(client, data);

	data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config);
	if (IS_ERR(data->regmap)) {
		dev_err(dev, "failed to allocate register map\n");
		return PTR_ERR(data->regmap);
	}

	if (!of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor))
		data->shunt_resistor = shunt_resistor;
	else
		data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;

	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
							 data, &tps23861_chip_info,
							 NULL);
	if (IS_ERR(hwmon_dev))
		return PTR_ERR(hwmon_dev);

	tps23861_init_debugfs(data);

	return 0;
}

static int tps23861_remove(struct i2c_client *client)
{
	struct tps23861_data *data = i2c_get_clientdata(client);

	debugfs_remove_recursive(data->debugfs_dir);

	return 0;
}

static const struct of_device_id __maybe_unused tps23861_of_match[] = {
	{ .compatible = "ti,tps23861", },
	{ },
};
MODULE_DEVICE_TABLE(of, tps23861_of_match);

static struct i2c_driver tps23861_driver = {
	.probe_new		= tps23861_probe,
	.remove			= tps23861_remove,
	.driver = {
		.name		= "tps23861",
		.of_match_table	= of_match_ptr(tps23861_of_match),
	},
};
module_i2c_driver(tps23861_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
MODULE_DESCRIPTION("TI TPS23861 PoE PSE");
Commit	Line	Data
fff7b8ab RM	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* Copyright (c) 2020 Sartura Ltd.
	4	*
	5	* Driver for the TI TPS23861 PoE PSE.
	6	*
	7	* Author: Robert Marko <robert.marko@sartura.hr>
	8	*/
	9
	10	#include <linux/bitfield.h>
	11	#include <linux/debugfs.h>
	12	#include <linux/delay.h>
	13	#include <linux/hwmon-sysfs.h>
	14	#include <linux/hwmon.h>
	15	#include <linux/i2c.h>
	16	#include <linux/module.h>
	17	#include <linux/of_device.h>
	18	#include <linux/regmap.h>
	19
	20	#define TEMPERATURE 0x2c
	21	#define INPUT_VOLTAGE_LSB 0x2e
	22	#define INPUT_VOLTAGE_MSB 0x2f
	23	#define PORT_1_CURRENT_LSB 0x30
	24	#define PORT_1_CURRENT_MSB 0x31
	25	#define PORT_1_VOLTAGE_LSB 0x32
	26	#define PORT_1_VOLTAGE_MSB 0x33
	27	#define PORT_2_CURRENT_LSB 0x34
	28	#define PORT_2_CURRENT_MSB 0x35
	29	#define PORT_2_VOLTAGE_LSB 0x36
	30	#define PORT_2_VOLTAGE_MSB 0x37
	31	#define PORT_3_CURRENT_LSB 0x38
	32	#define PORT_3_CURRENT_MSB 0x39
	33	#define PORT_3_VOLTAGE_LSB 0x3a
	34	#define PORT_3_VOLTAGE_MSB 0x3b
	35	#define PORT_4_CURRENT_LSB 0x3c
	36	#define PORT_4_CURRENT_MSB 0x3d
	37	#define PORT_4_VOLTAGE_LSB 0x3e
	38	#define PORT_4_VOLTAGE_MSB 0x3f
	39	#define PORT_N_CURRENT_LSB_OFFSET 0x04
	40	#define PORT_N_VOLTAGE_LSB_OFFSET 0x04
	41	#define VOLTAGE_CURRENT_MASK GENMASK(13, 0)
	42	#define PORT_1_RESISTANCE_LSB 0x60
	43	#define PORT_1_RESISTANCE_MSB 0x61
	44	#define PORT_2_RESISTANCE_LSB 0x62
	45	#define PORT_2_RESISTANCE_MSB 0x63
	46	#define PORT_3_RESISTANCE_LSB 0x64
	47	#define PORT_3_RESISTANCE_MSB 0x65
	48	#define PORT_4_RESISTANCE_LSB 0x66
	49	#define PORT_4_RESISTANCE_MSB 0x67
	50	#define PORT_N_RESISTANCE_LSB_OFFSET 0x02
	51	#define PORT_RESISTANCE_MASK GENMASK(13, 0)
	52	#define PORT_RESISTANCE_RSN_MASK GENMASK(15, 14)
	53	#define PORT_RESISTANCE_RSN_OTHER 0
	54	#define PORT_RESISTANCE_RSN_LOW 1
	55	#define PORT_RESISTANCE_RSN_OPEN 2
	56	#define PORT_RESISTANCE_RSN_SHORT 3
	57	#define PORT_1_STATUS 0x0c
	58	#define PORT_2_STATUS 0x0d
	59	#define PORT_3_STATUS 0x0e
	60	#define PORT_4_STATUS 0x0f
	61	#define PORT_STATUS_CLASS_MASK GENMASK(7, 4)
	62	#define PORT_STATUS_DETECT_MASK GENMASK(3, 0)
	63	#define PORT_CLASS_UNKNOWN 0
	64	#define PORT_CLASS_1 1
65	#define PORT_CLASS_2 2
66	#define PORT_CLASS_3 3
67	#define PORT_CLASS_4 4
68	#define PORT_CLASS_RESERVED 5
69	#define PORT_CLASS_0 6
70	#define PORT_CLASS_OVERCURRENT 7
71	#define PORT_CLASS_MISMATCH 8
72	#define PORT_DETECT_UNKNOWN 0
73	#define PORT_DETECT_SHORT 1
74	#define PORT_DETECT_RESERVED 2
75	#define PORT_DETECT_RESISTANCE_LOW 3
76	#define PORT_DETECT_RESISTANCE_OK 4
77	#define PORT_DETECT_RESISTANCE_HIGH 5
78	#define PORT_DETECT_OPEN_CIRCUIT 6
79	#define PORT_DETECT_RESERVED_2 7
80	#define PORT_DETECT_MOSFET_FAULT 8
81	#define PORT_DETECT_LEGACY 9
82	/* Measurment beyond clamp voltage */
83	#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10
84	/* Insufficient voltage delta */
85	#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11
86	#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12
87	#define POE_PLUS 0x40
88	#define OPERATING_MODE 0x12
89	#define OPERATING_MODE_OFF 0
90	#define OPERATING_MODE_MANUAL 1
91	#define OPERATING_MODE_SEMI 2
92	#define OPERATING_MODE_AUTO 3
93	#define OPERATING_MODE_PORT_1_MASK GENMASK(1, 0)
94	#define OPERATING_MODE_PORT_2_MASK GENMASK(3, 2)
95	#define OPERATING_MODE_PORT_3_MASK GENMASK(5, 4)
96	#define OPERATING_MODE_PORT_4_MASK GENMASK(7, 6)
97
98	#define DETECT_CLASS_RESTART 0x18
99	#define POWER_ENABLE 0x19
100	#define TPS23861_NUM_PORTS 4
101
102	#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
103	#define VOLTAGE_LSB 3662 /* 3.662 mV */
104	#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
105	#define CURRENT_LSB_255 62260 /* 62.260 uA */
106	#define CURRENT_LSB_250 61039 /* 61.039 uA */
107	#define RESISTANCE_LSB 110966 /* 11.0966 Ohm*/
108	#define RESISTANCE_LSB_LOW 157216 /* 15.7216 Ohm*/
109
110	struct tps23861_data {
111	struct regmap *regmap;
112	u32 shunt_resistor;
113	struct i2c_client *client;
114	struct dentry *debugfs_dir;
115	};
116
117	static struct regmap_config tps23861_regmap_config = {
118	.reg_bits = 8,
119	.val_bits = 8,
120	};
121
122	static int tps23861_read_temp(struct tps23861_data data, long val)
123	{
124	unsigned int regval;
125	int err;
126
127	err = regmap_read(data->regmap, TEMPERATURE, &regval);
128	if (err < 0)
129	return err;
130
131	val = (regval TEMPERATURE_LSB) - 20000;
132
133	return 0;
134	}
135
136	static int tps23861_read_voltage(struct tps23861_data *data, int channel,
137	long *val)
138	{
139	unsigned int regval;
140	int err;
141
142	if (channel < TPS23861_NUM_PORTS) {
143	err = regmap_bulk_read(data->regmap,
144	PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
145	&regval, 2);
146	} else {
147	err = regmap_bulk_read(data->regmap,
148	INPUT_VOLTAGE_LSB,
149	&regval, 2);
150	}
151	if (err < 0)
152	return err;
153
154	val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) VOLTAGE_LSB) / 1000;
155
156	return 0;
157	}
158
159	static int tps23861_read_current(struct tps23861_data *data, int channel,
160	long *val)
161	{
162	unsigned int current_lsb;
163	unsigned int regval;
164	int err;
165
166	if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
167	current_lsb = CURRENT_LSB_255;
168	else
169	current_lsb = CURRENT_LSB_250;
170
171	err = regmap_bulk_read(data->regmap,
172	PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
173	&regval, 2);
174	if (err < 0)
175	return err;
176
177	val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) current_lsb) / 1000000;
178
179	return 0;
180	}
181
182	static int tps23861_port_disable(struct tps23861_data *data, int channel)
183	{
184	unsigned int regval = 0;
185	int err;
186
187	regval \|= BIT(channel + 4);
188	err = regmap_write(data->regmap, POWER_ENABLE, regval);
189
190	return err;
191	}
192
193	static int tps23861_port_enable(struct tps23861_data *data, int channel)
194	{
195	unsigned int regval = 0;
196	int err;
197
198	regval \|= BIT(channel);
199	regval \|= BIT(channel + 4);
200	err = regmap_write(data->regmap, DETECT_CLASS_RESTART, regval);
201
202	return err;
203	}
204
205	static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
206	u32 attr, int channel)
207	{
208	switch (type) {
209	case hwmon_temp:
210	switch (attr) {
211	case hwmon_temp_input:
212	case hwmon_temp_label:
213	return 0444;
214	default:
215	return 0;
216	}
217	case hwmon_in:
218	switch (attr) {
219	case hwmon_in_input:
220	case hwmon_in_label:
221	return 0444;
222	case hwmon_in_enable:
223	return 0200;
224	default:
225	return 0;
226	}
227	case hwmon_curr:
228	switch (attr) {
229	case hwmon_curr_input:
230	case hwmon_curr_label:
231	return 0444;
232	default:
233	return 0;
234	}
235	default:
236	return 0;
237	}
238	}
239
240	static int tps23861_write(struct device *dev, enum hwmon_sensor_types type,
241	u32 attr, int channel, long val)
242	{
243	struct tps23861_data *data = dev_get_drvdata(dev);
244	int err;
245
246	switch (type) {
247	case hwmon_in:
248	switch (attr) {
249	case hwmon_in_enable:
250	if (val == 0)
251	err = tps23861_port_disable(data, channel);
252	else if (val == 1)
253	err = tps23861_port_enable(data, channel);
254	else
255	err = -EINVAL;
256	break;
257	default:
258	return -EOPNOTSUPP;
259	}
260	break;
261	default:
262	return -EOPNOTSUPP;
263	}
264
265	return err;
266	}
267
268	static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
269	u32 attr, int channel, long *val)
270	{
271	struct tps23861_data *data = dev_get_drvdata(dev);
272	int err;
273
274	switch (type) {
275	case hwmon_temp:
276	switch (attr) {
277	case hwmon_temp_input:
278	err = tps23861_read_temp(data, val);
279	break;
280	default:
281	return -EOPNOTSUPP;
282	}
283	break;
284	case hwmon_in:
285	switch (attr) {
286	case hwmon_in_input:
287	err = tps23861_read_voltage(data, channel, val);
288	break;
289	default:
290	return -EOPNOTSUPP;
291	}
292	break;
293	case hwmon_curr:
294	switch (attr) {
295	case hwmon_curr_input:
296	err = tps23861_read_current(data, channel, val);
297	break;
298	default:
299	return -EOPNOTSUPP;
300	}
301	break;
302	default:
303	return -EOPNOTSUPP;
304	}
305
306	return err;
307	}
308
309	static const char * const tps23861_port_label[] = {
310	"Port1",
311	"Port2",
312	"Port3",
313	"Port4",
314	"Input",
315	};
316
317	static int tps23861_read_string(struct device *dev,
318	enum hwmon_sensor_types type,
319	u32 attr, int channel, const char **str)
320	{
321	switch (type) {
322	case hwmon_in:
323	case hwmon_curr:
324	*str = tps23861_port_label[channel];
325	break;
326	case hwmon_temp:
327	*str = "Die";
328	break;
329	default:
330	return -EOPNOTSUPP;
331	}
332
333	return 0;
334	}
335
336	static const struct hwmon_channel_info *tps23861_info[] = {
337	HWMON_CHANNEL_INFO(chip,
338	HWMON_C_REGISTER_TZ),
339	HWMON_CHANNEL_INFO(temp,
340	HWMON_T_INPUT \| HWMON_T_LABEL),
341	HWMON_CHANNEL_INFO(in,
342	HWMON_I_INPUT \| HWMON_I_ENABLE \| HWMON_I_LABEL,
343	HWMON_I_INPUT \| HWMON_I_ENABLE \| HWMON_I_LABEL,
344	HWMON_I_INPUT \| HWMON_I_ENABLE \| HWMON_I_LABEL,
345	HWMON_I_INPUT \| HWMON_I_ENABLE \| HWMON_I_LABEL,
346	HWMON_I_INPUT \| HWMON_I_LABEL),
347	HWMON_CHANNEL_INFO(curr,
348	HWMON_C_INPUT \| HWMON_C_LABEL,
349	HWMON_C_INPUT \| HWMON_C_LABEL,
350	HWMON_C_INPUT \| HWMON_C_LABEL,
351	HWMON_C_INPUT \| HWMON_C_LABEL),
352	NULL
353	};
354
355	static const struct hwmon_ops tps23861_hwmon_ops = {
356	.is_visible = tps23861_is_visible,
357	.write = tps23861_write,
358	.read = tps23861_read,
359	.read_string = tps23861_read_string,
360	};
361
362	static const struct hwmon_chip_info tps23861_chip_info = {
363	.ops = &tps23861_hwmon_ops,
364	.info = tps23861_info,
365	};
366
367	static char tps23861_port_operating_mode(struct tps23861_data data, int port)
368	{
369	unsigned int regval;
370	int mode;
371
372	regmap_read(data->regmap, OPERATING_MODE, &regval);
373
374	switch (port) {
375	case 1:
376	mode = FIELD_GET(OPERATING_MODE_PORT_1_MASK, regval);
377	break;
378	case 2:
379	mode = FIELD_GET(OPERATING_MODE_PORT_2_MASK, regval);
380	break;
381	case 3:
382	mode = FIELD_GET(OPERATING_MODE_PORT_3_MASK, regval);
383	break;
384	case 4:
385	mode = FIELD_GET(OPERATING_MODE_PORT_4_MASK, regval);
386	break;
387	default:
388	mode = -EINVAL;
389	}
390
391	switch (mode) {
392	case OPERATING_MODE_OFF:
393	return "Off";
394	case OPERATING_MODE_MANUAL:
395	return "Manual";
396	case OPERATING_MODE_SEMI:
397	return "Semi-Auto";
398	case OPERATING_MODE_AUTO:
399	return "Auto";
400	default:
401	return "Invalid";
402	}
403	}
404
405	static char tps23861_port_detect_status(struct tps23861_data data, int port)
406	{
407	unsigned int regval;
408
409	regmap_read(data->regmap,
410	PORT_1_STATUS + (port - 1),
411	&regval);
412
413	switch (FIELD_GET(PORT_STATUS_DETECT_MASK, regval)) {
414	case PORT_DETECT_UNKNOWN:
415	return "Unknown device";
416	case PORT_DETECT_SHORT:
417	return "Short circuit";
418	case PORT_DETECT_RESISTANCE_LOW:
419	return "Too low resistance";
420	case PORT_DETECT_RESISTANCE_OK:
421	return "Valid resistance";
422	case PORT_DETECT_RESISTANCE_HIGH:
423	return "Too high resistance";
424	case PORT_DETECT_OPEN_CIRCUIT:
425	return "Open circuit";
426	case PORT_DETECT_MOSFET_FAULT:
427	return "MOSFET fault";
428	case PORT_DETECT_LEGACY:
429	return "Legacy device";
430	case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
431	return "Invalid capacitance, beyond clamp voltage";
432	case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
433	return "Invalid capacitance, insufficient voltage delta";
434	case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
435	return "Valid capacitance, outside of legacy range";
436	case PORT_DETECT_RESERVED:
437	case PORT_DETECT_RESERVED_2:
438	default:
439	return "Invalid";
440	}
441	}
442
443	static char tps23861_port_class_status(struct tps23861_data data, int port)
444	{
445	unsigned int regval;
446
447	regmap_read(data->regmap,
448	PORT_1_STATUS + (port - 1),
449	&regval);
450
451	switch (FIELD_GET(PORT_STATUS_CLASS_MASK, regval)) {
452	case PORT_CLASS_UNKNOWN:
453	return "Unknown";
454	case PORT_CLASS_RESERVED:
455	case PORT_CLASS_0:
456	return "0";
457	case PORT_CLASS_1:
458	return "1";
459	case PORT_CLASS_2:
460	return "2";
461	case PORT_CLASS_3:
462	return "3";
463	case PORT_CLASS_4:
464	return "4";
465	case PORT_CLASS_OVERCURRENT:
466	return "Overcurrent";
467	case PORT_CLASS_MISMATCH:
468	return "Mismatch";
469	default:
470	return "Invalid";
471	}
472	}
473
474	static char tps23861_port_poe_plus_status(struct tps23861_data data, int port)
475	{
476	unsigned int regval;
477
478	regmap_read(data->regmap, POE_PLUS, &regval);
479
480	if (BIT(port + 3) & regval)
481	return "Yes";
482	else
483	return "No";
484	}
485
486	static int tps23861_port_resistance(struct tps23861_data *data, int port)
487	{
488	u16 regval;
489
490	regmap_bulk_read(data->regmap,
491	PORT_1_RESISTANCE_LSB + PORT_N_RESISTANCE_LSB_OFFSET * (port - 1),
492	&regval,
493	2);
494
495	switch (FIELD_GET(PORT_RESISTANCE_RSN_MASK, regval)) {
496	case PORT_RESISTANCE_RSN_OTHER:
497	return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB) / 10000;
498	case PORT_RESISTANCE_RSN_LOW:
499	return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB_LOW) / 10000;
500	case PORT_RESISTANCE_RSN_SHORT:
501	case PORT_RESISTANCE_RSN_OPEN:
502	default:
503	return 0;
504	}
505	}
506
507	static int tps23861_port_status_show(struct seq_file s, void data)
508	{
509	struct tps23861_data *priv = s->private;
510	int i;
511
512	for (i = 1; i < TPS23861_NUM_PORTS + 1; i++) {
513	seq_printf(s, "Port: \t\t%d\n", i);
514	seq_printf(s, "Operating mode: %s\n", tps23861_port_operating_mode(priv, i));
515	seq_printf(s, "Detected: \t%s\n", tps23861_port_detect_status(priv, i));
516	seq_printf(s, "Class: \t\t%s\n", tps23861_port_class_status(priv, i));
517	seq_printf(s, "PoE Plus: \t%s\n", tps23861_port_poe_plus_status(priv, i));
518	seq_printf(s, "Resistance: \t%d\n", tps23861_port_resistance(priv, i));
519	seq_putc(s, '\n');
520	}
521
522	return 0;
523	}
524
525	DEFINE_SHOW_ATTRIBUTE(tps23861_port_status);
526
527	static void tps23861_init_debugfs(struct tps23861_data *data)
528	{
529	data->debugfs_dir = debugfs_create_dir(data->client->name, NULL);
530
531	debugfs_create_file("port_status",
532	0400,
533	data->debugfs_dir,
534	data,
535	&tps23861_port_status_fops);
536	}
537
538	static int tps23861_probe(struct i2c_client *client)
539	{
540	struct device *dev = &client->dev;
541	struct tps23861_data *data;
542	struct device *hwmon_dev;
543	u32 shunt_resistor;
544
545	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
546	if (!data)
547	return -ENOMEM;
548
549	data->client = client;
550	i2c_set_clientdata(client, data);
551
552	data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config);
553	if (IS_ERR(data->regmap)) {
554	dev_err(dev, "failed to allocate register map\n");
555	return PTR_ERR(data->regmap);
556	}
557
558	if (!of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor))
559	data->shunt_resistor = shunt_resistor;
560	else
561	data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
562
563	hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
564	data, &tps23861_chip_info,
565	NULL);
566	if (IS_ERR(hwmon_dev))
567	return PTR_ERR(hwmon_dev);
568
569	tps23861_init_debugfs(data);
570
571	return 0;
572	}
573
574	static int tps23861_remove(struct i2c_client *client)
575	{
576	struct tps23861_data *data = i2c_get_clientdata(client);
577
578	debugfs_remove_recursive(data->debugfs_dir);
579
580	return 0;
581	}
582
583	static const struct of_device_id __maybe_unused tps23861_of_match[] = {
584	{ .compatible = "ti,tps23861", },
585	{ },
586	};
587	MODULE_DEVICE_TABLE(of, tps23861_of_match);
588
589	static struct i2c_driver tps23861_driver = {
590	.probe_new = tps23861_probe,
591	.remove = tps23861_remove,
592	.driver = {
593	.name = "tps23861",
594	.of_match_table = of_match_ptr(tps23861_of_match),
595	},
596	};
597	module_i2c_driver(tps23861_driver);
598
599	MODULE_LICENSE("GPL");
600	MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>");
601	MODULE_DESCRIPTION("TI TPS23861 PoE PSE");