text: // SPDX-License-Identifier: GPL-2.0-or-later
  /*
   * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
   * and Digital Power Monitor
   *
   * Copyright (c) 2011 Ericsson AB.
   * Copyright (c) 2018 Guenter Roeck
   */
  
  #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/bitops.h>
  #include <linux/bitfield.h>
  #include <linux/log2.h>
  #include "pmbus.h"
  
  enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
  
  #define ADM1275_MFR_STATUS_IOUT_WARN2	BIT(0)
  #define ADM1293_MFR_STATUS_VAUX_UV_WARN	BIT(5)
  #define ADM1293_MFR_STATUS_VAUX_OV_WARN	BIT(6)
  
  #define ADM1275_PEAK_IOUT		0xd0
  #define ADM1275_PEAK_VIN		0xd1
  #define ADM1275_PEAK_VOUT		0xd2
  #define ADM1275_PMON_CONFIG		0xd4
  
  #define ADM1275_VIN_VOUT_SELECT		BIT(6)
  #define ADM1275_VRANGE			BIT(5)
  #define ADM1075_IRANGE_50		BIT(4)
  #define ADM1075_IRANGE_25		BIT(3)
  #define ADM1075_IRANGE_MASK		(BIT(3) | BIT(4))
  
  #define ADM1272_IRANGE			BIT(0)
  
  #define ADM1278_TEMP1_EN		BIT(3)
  #define ADM1278_VIN_EN			BIT(2)
  #define ADM1278_VOUT_EN			BIT(1)
  
  #define ADM1293_IRANGE_25		0
  #define ADM1293_IRANGE_50		BIT(6)
  #define ADM1293_IRANGE_100		BIT(7)
  #define ADM1293_IRANGE_200		(BIT(6) | BIT(7))
  #define ADM1293_IRANGE_MASK		(BIT(6) | BIT(7))
  
  #define ADM1293_VIN_SEL_012		BIT(2)
  #define ADM1293_VIN_SEL_074		BIT(3)
  #define ADM1293_VIN_SEL_210		(BIT(2) | BIT(3))
  #define ADM1293_VIN_SEL_MASK		(BIT(2) | BIT(3))
  
  #define ADM1293_VAUX_EN			BIT(1)
  
  #define ADM1278_PEAK_TEMP		0xd7
  #define ADM1275_IOUT_WARN2_LIMIT	0xd7
  #define ADM1275_DEVICE_CONFIG		0xd8
  
  #define ADM1275_IOUT_WARN2_SELECT	BIT(4)
  
  #define ADM1276_PEAK_PIN		0xda
  #define ADM1075_READ_VAUX		0xdd
  #define ADM1075_VAUX_OV_WARN_LIMIT	0xde
  #define ADM1075_VAUX_UV_WARN_LIMIT	0xdf
  #define ADM1293_IOUT_MIN		0xe3
  #define ADM1293_PIN_MIN			0xe4
  #define ADM1075_VAUX_STATUS		0xf6
  
  #define ADM1075_VAUX_OV_WARN		BIT(7)
  #define ADM1075_VAUX_UV_WARN		BIT(6)
  
  #define ADM1275_VI_AVG_SHIFT		0
  #define ADM1275_VI_AVG_MASK		GENMASK(ADM1275_VI_AVG_SHIFT + 2, \
  						ADM1275_VI_AVG_SHIFT)
  #define ADM1275_SAMPLES_AVG_MAX		128
  
  #define ADM1278_PWR_AVG_SHIFT		11
  #define ADM1278_PWR_AVG_MASK		GENMASK(ADM1278_PWR_AVG_SHIFT + 2, \
  						ADM1278_PWR_AVG_SHIFT)
  #define ADM1278_VI_AVG_SHIFT		8
  #define ADM1278_VI_AVG_MASK		GENMASK(ADM1278_VI_AVG_SHIFT + 2, \
  						ADM1278_VI_AVG_SHIFT)
  
  struct adm1275_data {
  	int id;
  	bool have_oc_fault;
  	bool have_uc_fault;
  	bool have_vout;
  	bool have_vaux_status;
  	bool have_mfr_vaux_status;
  	bool have_iout_min;
  	bool have_pin_min;
  	bool have_pin_max;
  	bool have_temp_max;
  	bool have_power_sampling;
  	struct pmbus_driver_info info;
  };
  
  #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
  
  struct coefficients {
  	s16 m;
  	s16 b;
  	s16 R;
  };
  
  static const struct coefficients adm1075_coefficients[] = {
  	[0] = { 27169, 0, -1 },		/* voltage */
  	[1] = { 806, 20475, -1 },	/* current, irange25 */
  	[2] = { 404, 20475, -1 },	/* current, irange50 */
  	[3] = { 8549, 0, -1 },		/* power, irange25 */
  	[4] = { 4279, 0, -1 },		/* power, irange50 */
  };
  
  static const struct coefficients adm1272_coefficients[] = {
  	[0] = { 6770, 0, -2 },		/* voltage, vrange 60V */
  	[1] = { 4062, 0, -2 },		/* voltage, vrange 100V */
  	[2] = { 1326, 20480, -1 },	/* current, vsense range 15mV */
  	[3] = { 663, 20480, -1 },	/* current, vsense range 30mV */
  	[4] = { 3512, 0, -2 },		/* power, vrange 60V, irange 15mV */
  	[5] = { 21071, 0, -3 },		/* power, vrange 100V, irange 15mV */
  	[6] = { 17561, 0, -3 },		/* power, vrange 60V, irange 30mV */
  	[7] = { 10535, 0, -3 },		/* power, vrange 100V, irange 30mV */
  	[8] = { 42, 31871, -1 },	/* temperature */
  
  };
  
  static const struct coefficients adm1275_coefficients[] = {
  	[0] = { 19199, 0, -2 },		/* voltage, vrange set */
  	[1] = { 6720, 0, -1 },		/* voltage, vrange not set */
  	[2] = { 807, 20475, -1 },	/* current */
  };
  
  static const struct coefficients adm1276_coefficients[] = {
  	[0] = { 19199, 0, -2 },		/* voltage, vrange set */
  	[1] = { 6720, 0, -1 },		/* voltage, vrange not set */
  	[2] = { 807, 20475, -1 },	/* current */
  	[3] = { 6043, 0, -2 },		/* power, vrange set */
  	[4] = { 2115, 0, -1 },		/* power, vrange not set */
  };
  
  static const struct coefficients adm1278_coefficients[] = {
  	[0] = { 19599, 0, -2 },		/* voltage */
  	[1] = { 800, 20475, -1 },	/* current */
  	[2] = { 6123, 0, -2 },		/* power */
  	[3] = { 42, 31880, -1 },	/* temperature */
  };
  
  static const struct coefficients adm1293_coefficients[] = {
  	[0] = { 3333, -1, 0 },		/* voltage, vrange 1.2V */
  	[1] = { 5552, -5, -1 },		/* voltage, vrange 7.4V */
  	[2] = { 19604, -50, -2 },	/* voltage, vrange 21V */
  	[3] = { 8000, -100, -2 },	/* current, irange25 */
  	[4] = { 4000, -100, -2 },	/* current, irange50 */
  	[5] = { 20000, -1000, -3 },	/* current, irange100 */
  	[6] = { 10000, -1000, -3 },	/* current, irange200 */
  	[7] = { 10417, 0, -1 },		/* power, 1.2V, irange25 */
  	[8] = { 5208, 0, -1 },		/* power, 1.2V, irange50 */
  	[9] = { 26042, 0, -2 },		/* power, 1.2V, irange100 */
  	[10] = { 13021, 0, -2 },	/* power, 1.2V, irange200 */
  	[11] = { 17351, 0, -2 },	/* power, 7.4V, irange25 */
  	[12] = { 8676, 0, -2 },		/* power, 7.4V, irange50 */
  	[13] = { 4338, 0, -2 },		/* power, 7.4V, irange100 */
  	[14] = { 21689, 0, -3 },	/* power, 7.4V, irange200 */
  	[15] = { 6126, 0, -2 },		/* power, 21V, irange25 */
  	[16] = { 30631, 0, -3 },	/* power, 21V, irange50 */
  	[17] = { 15316, 0, -3 },	/* power, 21V, irange100 */
  	[18] = { 7658, 0, -3 },		/* power, 21V, irange200 */
  };
  
  static int adm1275_read_pmon_config(const struct adm1275_data *data,
  				    struct i2c_client *client, bool is_power)
  {
  	int shift, ret;
  	u16 mask;
  
  	/*
  	 * The PMON configuration register is a 16-bit register only on chips
  	 * supporting power average sampling. On other chips it is an 8-bit
  	 * register.
  	 */
  	if (data->have_power_sampling) {
  		ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
  		mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
  		shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
  	} else {
  		ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
  		mask = ADM1275_VI_AVG_MASK;
  		shift = ADM1275_VI_AVG_SHIFT;
  	}
  	if (ret < 0)
  		return ret;
  
  	return (ret & mask) >> shift;
  }
  
  static int adm1275_write_pmon_config(const struct adm1275_data *data,
  				     struct i2c_client *client,
  				     bool is_power, u16 word)
  {
  	int shift, ret;
  	u16 mask;
  
  	if (data->have_power_sampling) {
  		ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
  		mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
  		shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
  	} else {
  		ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
  		mask = ADM1275_VI_AVG_MASK;
  		shift = ADM1275_VI_AVG_SHIFT;
  	}
  	if (ret < 0)
  		return ret;
  
  	word = (ret & ~mask) | ((word << shift) & mask);
  	if (data->have_power_sampling)
  		ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG,
  						word);
  	else
  		ret = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONFIG,
  						word);
  
  	return ret;
  }
  
  static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
  {
  	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  	const struct adm1275_data *data = to_adm1275_data(info);
  	int ret = 0;
  
  	if (page > 0)
  		return -ENXIO;
  
  	switch (reg) {
  	case PMBUS_IOUT_UC_FAULT_LIMIT:
  		if (!data->have_uc_fault)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
  		break;
  	case PMBUS_IOUT_OC_FAULT_LIMIT:
  		if (!data->have_oc_fault)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
  		break;
  	case PMBUS_VOUT_OV_WARN_LIMIT:
  		if (data->have_vout)
  			return -ENODATA;
  		ret = pmbus_read_word_data(client, 0,
  					   ADM1075_VAUX_OV_WARN_LIMIT);
  		break;
  	case PMBUS_VOUT_UV_WARN_LIMIT:
  		if (data->have_vout)
  			return -ENODATA;
  		ret = pmbus_read_word_data(client, 0,
  					   ADM1075_VAUX_UV_WARN_LIMIT);
  		break;
  	case PMBUS_READ_VOUT:
  		if (data->have_vout)
  			return -ENODATA;
  		ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX);
  		break;
  	case PMBUS_VIRT_READ_IOUT_MIN:
  		if (!data->have_iout_min)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1293_IOUT_MIN);
  		break;
  	case PMBUS_VIRT_READ_IOUT_MAX:
  		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
  		break;
  	case PMBUS_VIRT_READ_VOUT_MAX:
  		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
  		break;
  	case PMBUS_VIRT_READ_VIN_MAX:
  		ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
  		break;
  	case PMBUS_VIRT_READ_PIN_MIN:
  		if (!data->have_pin_min)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1293_PIN_MIN);
  		break;
  	case PMBUS_VIRT_READ_PIN_MAX:
  		if (!data->have_pin_max)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
  		break;
  	case PMBUS_VIRT_READ_TEMP_MAX:
  		if (!data->have_temp_max)
  			return -ENXIO;
  		ret = pmbus_read_word_data(client, 0, ADM1278_PEAK_TEMP);
  		break;
  	case PMBUS_VIRT_RESET_IOUT_HISTORY:
  	case PMBUS_VIRT_RESET_VOUT_HISTORY:
  	case PMBUS_VIRT_RESET_VIN_HISTORY:
  		break;
  	case PMBUS_VIRT_RESET_PIN_HISTORY:
  		if (!data->have_pin_max)
  			return -ENXIO;
  		break;
  	case PMBUS_VIRT_RESET_TEMP_HISTORY:
  		if (!data->have_temp_max)
  			return -ENXIO;
  		break;
  	case PMBUS_VIRT_POWER_SAMPLES:
  		if (!data->have_power_sampling)
  			return -ENXIO;
  		ret = adm1275_read_pmon_config(data, client, true);
  		if (ret < 0)
  			break;
  		ret = BIT(ret);
  		break;
  	case PMBUS_VIRT_IN_SAMPLES:
  	case PMBUS_VIRT_CURR_SAMPLES:
  		ret = adm1275_read_pmon_config(data, client, false);
  		if (ret < 0)
  			break;
  		ret = BIT(ret);
  		break;
  	default:
  		ret = -ENODATA;
  		break;
  	}
  	return ret;
  }
  
  static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
  				   u16 word)
  {
  	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  	const struct adm1275_data *data = to_adm1275_data(info);
  	int ret;
  
  	if (page > 0)
  		return -ENXIO;
  
  	switch (reg) {
  	case PMBUS_IOUT_UC_FAULT_LIMIT:
  	case PMBUS_IOUT_OC_FAULT_LIMIT:
  		ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
  					    word);
  		break;
  	case PMBUS_VIRT_RESET_IOUT_HISTORY:
  		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
  		if (!ret && data->have_iout_min)
  			ret = pmbus_write_word_data(client, 0,
  						    ADM1293_IOUT_MIN, 0);
  		break;
  	case PMBUS_VIRT_RESET_VOUT_HISTORY:
  		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
  		break;
  	case PMBUS_VIRT_RESET_VIN_HISTORY:
  		ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
  		break;
  	case PMBUS_VIRT_RESET_PIN_HISTORY:
  		ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
  		if (!ret && data->have_pin_min)
  			ret = pmbus_write_word_data(client, 0,
  						    ADM1293_PIN_MIN, 0);
  		break;
  	case PMBUS_VIRT_RESET_TEMP_HISTORY:
  		ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
  		break;
  	case PMBUS_VIRT_POWER_SAMPLES:
  		if (!data->have_power_sampling)
  			return -ENXIO;
  		word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
  		ret = adm1275_write_pmon_config(data, client, true,
  						ilog2(word));
  		break;
  	case PMBUS_VIRT_IN_SAMPLES:
  	case PMBUS_VIRT_CURR_SAMPLES:
  		word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
  		ret = adm1275_write_pmon_config(data, client, false,
  						ilog2(word));
  		break;
  	default:
  		ret = -ENODATA;
  		break;
  	}
  	return ret;
  }
  
  static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
  {
  	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
  	const struct adm1275_data *data = to_adm1275_data(info);
  	int mfr_status, ret;
  
  	if (page > 0)
  		return -ENXIO;
  
  	switch (reg) {
  	case PMBUS_STATUS_IOUT:
  		ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
  		if (ret < 0)
  			break;
  		if (!data->have_oc_fault && !data->have_uc_fault)
  			break;
  		mfr_status = pmbus_read_byte_data(client, page,
  						  PMBUS_STATUS_MFR_SPECIFIC);
  		if (mfr_status < 0)
  			return mfr_status;
  		if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
  			ret |= data->have_oc_fault ?
  			  PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
  		}
  		break;
  	case PMBUS_STATUS_VOUT:
  		if (data->have_vout)
  			return -ENODATA;
  		ret = 0;
  		if (data->have_vaux_status) {
  			mfr_status = pmbus_read_byte_data(client, 0,
  							  ADM1075_VAUX_STATUS);
  			if (mfr_status < 0)
  				return mfr_status;
  			if (mfr_status & ADM1075_VAUX_OV_WARN)
  				ret |= PB_VOLTAGE_OV_WARNING;
  			if (mfr_status & ADM1075_VAUX_UV_WARN)
  				ret |= PB_VOLTAGE_UV_WARNING;
  		} else if (data->have_mfr_vaux_status) {
  			mfr_status = pmbus_read_byte_data(client, page,
  						PMBUS_STATUS_MFR_SPECIFIC);
  			if (mfr_status < 0)
  				return mfr_status;
  			if (mfr_status & ADM1293_MFR_STATUS_VAUX_OV_WARN)
  				ret |= PB_VOLTAGE_OV_WARNING;
  			if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN)
  				ret |= PB_VOLTAGE_UV_WARNING;
  		}
  		break;
  	default:
  		ret = -ENODATA;
  		break;
  	}
  	return ret;
  }
  
  static const struct i2c_device_id adm1275_id[] = {
  	{ "adm1075", adm1075 },
  	{ "adm1272", adm1272 },
  	{ "adm1275", adm1275 },
  	{ "adm1276", adm1276 },
  	{ "adm1278", adm1278 },
  	{ "adm1293", adm1293 },
  	{ "adm1294", adm1294 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, adm1275_id);
  
  static int adm1275_probe(struct i2c_client *client,
  			 const struct i2c_device_id *id)
  {
  	s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
  	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
  	int config, device_config;
  	int ret;
  	struct pmbus_driver_info *info;
  	struct adm1275_data *data;
  	const struct i2c_device_id *mid;
  	const struct coefficients *coefficients;
  	int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
  	int tindex = -1;
  	u32 shunt;
  
  	if (!i2c_check_functionality(client->adapter,
  				     I2C_FUNC_SMBUS_READ_BYTE_DATA
  				     | I2C_FUNC_SMBUS_BLOCK_DATA))
  		return -ENODEV;
  
  	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
  	if (ret < 0) {
  		dev_err(&client->dev, "Failed to read Manufacturer ID\n");
  		return ret;
  	}
  	if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
  		dev_err(&client->dev, "Unsupported Manufacturer ID\n");
  		return -ENODEV;
  	}
  
  	ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
  	if (ret < 0) {
  		dev_err(&client->dev, "Failed to read Manufacturer Model\n");
  		return ret;
  	}
  	for (mid = adm1275_id; mid->name[0]; mid++) {
  		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
  			break;
  	}
  	if (!mid->name[0]) {
  		dev_err(&client->dev, "Unsupported device\n");
  		return -ENODEV;
  	}
  
  	if (id->driver_data != mid->driver_data)
  		dev_notice(&client->dev,
  			   "Device mismatch: Configured %s, detected %s\n",
  			   id->name, mid->name);
  
  	if (mid->driver_data == adm1272 || mid->driver_data == adm1278 ||
  	    mid->driver_data == adm1293 || mid->driver_data == adm1294)
  		config_read_fn = i2c_smbus_read_word_data;
  	else
  		config_read_fn = i2c_smbus_read_byte_data;
  	config = config_read_fn(client, ADM1275_PMON_CONFIG);
  	if (config < 0)
  		return config;
  
  	device_config = config_read_fn(client, ADM1275_DEVICE_CONFIG);
  	if (device_config < 0)
  		return device_config;
  
  	data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
  			    GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;
  
  	if (of_property_read_u32(client->dev.of_node,
  				 "shunt-resistor-micro-ohms", &shunt))
  		shunt = 1000; /* 1 mOhm if not set via DT */
  
  	if (shunt == 0)
  		return -EINVAL;
  
  	data->id = mid->driver_data;
  
  	info = &data->info;
  
  	info->pages = 1;
  	info->format[PSC_VOLTAGE_IN] = direct;
  	info->format[PSC_VOLTAGE_OUT] = direct;
  	info->format[PSC_CURRENT_OUT] = direct;
  	info->format[PSC_POWER] = direct;
  	info->format[PSC_TEMPERATURE] = direct;
  	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
  			PMBUS_HAVE_SAMPLES;
  
  	info->read_word_data = adm1275_read_word_data;
  	info->read_byte_data = adm1275_read_byte_data;
  	info->write_word_data = adm1275_write_word_data;
  
  	switch (data->id) {
  	case adm1075:
  		if (device_config & ADM1275_IOUT_WARN2_SELECT)
  			data->have_oc_fault = true;
  		else
  			data->have_uc_fault = true;
  		data->have_pin_max = true;
  		data->have_vaux_status = true;
  
  		coefficients = adm1075_coefficients;
  		vindex = 0;
  		switch (config & ADM1075_IRANGE_MASK) {
  		case ADM1075_IRANGE_25:
  			cindex = 1;
  			pindex = 3;
  			break;
  		case ADM1075_IRANGE_50:
  			cindex = 2;
  			pindex = 4;
  			break;
  		default:
  			dev_err(&client->dev, "Invalid input current range");
  			break;
  		}
  
  		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
  		  | PMBUS_HAVE_STATUS_INPUT;
  		if (config & ADM1275_VIN_VOUT_SELECT)
  			info->func[0] |=
  			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  		break;
  	case adm1272:
  		data->have_vout = true;
  		data->have_pin_max = true;
  		data->have_temp_max = true;
  		data->have_power_sampling = true;
  
  		coefficients = adm1272_coefficients;
  		vindex = (config & ADM1275_VRANGE) ? 1 : 0;
  		cindex = (config & ADM1272_IRANGE) ? 3 : 2;
  		/* pindex depends on the combination of the above */
  		switch (config & (ADM1275_VRANGE | ADM1272_IRANGE)) {
  		case 0:
  		default:
  			pindex = 4;
  			break;
  		case ADM1275_VRANGE:
  			pindex = 5;
  			break;
  		case ADM1272_IRANGE:
  			pindex = 6;
  			break;
  		case ADM1275_VRANGE | ADM1272_IRANGE:
  			pindex = 7;
  			break;
  		}
  		tindex = 8;
  
  		info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  			PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  
  		/* Enable VOUT if not enabled (it is disabled by default) */
  		if (!(config & ADM1278_VOUT_EN)) {
  			config |= ADM1278_VOUT_EN;
  			ret = i2c_smbus_write_byte_data(client,
  							ADM1275_PMON_CONFIG,
  							config);
  			if (ret < 0) {
  				dev_err(&client->dev,
  					"Failed to enable VOUT monitoring\n");
  				return -ENODEV;
  			}
  		}
  
  		if (config & ADM1278_TEMP1_EN)
  			info->func[0] |=
  				PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
  		if (config & ADM1278_VIN_EN)
  			info->func[0] |= PMBUS_HAVE_VIN;
  		break;
  	case adm1275:
  		if (device_config & ADM1275_IOUT_WARN2_SELECT)
  			data->have_oc_fault = true;
  		else
  			data->have_uc_fault = true;
  		data->have_vout = true;
  
  		coefficients = adm1275_coefficients;
  		vindex = (config & ADM1275_VRANGE) ? 0 : 1;
  		cindex = 2;
  
  		if (config & ADM1275_VIN_VOUT_SELECT)
  			info->func[0] |=
  			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  		else
  			info->func[0] |=
  			  PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
  		break;
  	case adm1276:
  		if (device_config & ADM1275_IOUT_WARN2_SELECT)
  			data->have_oc_fault = true;
  		else
  			data->have_uc_fault = true;
  		data->have_vout = true;
  		data->have_pin_max = true;
  
  		coefficients = adm1276_coefficients;
  		vindex = (config & ADM1275_VRANGE) ? 0 : 1;
  		cindex = 2;
  		pindex = (config & ADM1275_VRANGE) ? 3 : 4;
  
  		info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
  		  | PMBUS_HAVE_STATUS_INPUT;
  		if (config & ADM1275_VIN_VOUT_SELECT)
  			info->func[0] |=
  			  PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  		break;
  	case adm1278:
  		data->have_vout = true;
  		data->have_pin_max = true;
  		data->have_temp_max = true;
  		data->have_power_sampling = true;
  
  		coefficients = adm1278_coefficients;
  		vindex = 0;
  		cindex = 1;
  		pindex = 2;
  		tindex = 3;
  
  		info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
  			PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  
  		/* Enable VOUT if not enabled (it is disabled by default) */
  		if (!(config & ADM1278_VOUT_EN)) {
  			config |= ADM1278_VOUT_EN;
  			ret = i2c_smbus_write_byte_data(client,
  							ADM1275_PMON_CONFIG,
  							config);
  			if (ret < 0) {
  				dev_err(&client->dev,
  					"Failed to enable VOUT monitoring\n");
  				return -ENODEV;
  			}
  		}
  
  		if (config & ADM1278_TEMP1_EN)
  			info->func[0] |=
  				PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
  		if (config & ADM1278_VIN_EN)
  			info->func[0] |= PMBUS_HAVE_VIN;
  		break;
  	case adm1293:
  	case adm1294:
  		data->have_iout_min = true;
  		data->have_pin_min = true;
  		data->have_pin_max = true;
  		data->have_mfr_vaux_status = true;
  		data->have_power_sampling = true;
  
  		coefficients = adm1293_coefficients;
  
  		voindex = 0;
  		switch (config & ADM1293_VIN_SEL_MASK) {
  		case ADM1293_VIN_SEL_012:	/* 1.2V */
  			vindex = 0;
  			break;
  		case ADM1293_VIN_SEL_074:	/* 7.4V */
  			vindex = 1;
  			break;
  		case ADM1293_VIN_SEL_210:	/* 21V */
  			vindex = 2;
  			break;
  		default:			/* disabled */
  			break;
  		}
  
  		switch (config & ADM1293_IRANGE_MASK) {
  		case ADM1293_IRANGE_25:
  			cindex = 3;
  			break;
  		case ADM1293_IRANGE_50:
  			cindex = 4;
  			break;
  		case ADM1293_IRANGE_100:
  			cindex = 5;
  			break;
  		case ADM1293_IRANGE_200:
  			cindex = 6;
  			break;
  		}
  
  		if (vindex >= 0)
  			pindex = 7 + vindex * 4 + (cindex - 3);
  
  		if (config & ADM1293_VAUX_EN)
  			info->func[0] |=
  				PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
  
  		info->func[0] |= PMBUS_HAVE_PIN |
  			PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
  
  		break;
  	default:
  		dev_err(&client->dev, "Unsupported device\n");
  		return -ENODEV;
  	}
  
  	if (voindex < 0)
  		voindex = vindex;
  	if (vindex >= 0) {
  		info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m;
  		info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b;
  		info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R;
  	}
  	if (voindex >= 0) {
  		info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m;
  		info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b;
  		info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
  	}
  	if (cindex >= 0) {
  		/* Scale current with sense resistor value */
  		info->m[PSC_CURRENT_OUT] =
  			coefficients[cindex].m * shunt / 1000;
  		info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
  		info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
  	}
  	if (pindex >= 0) {
  		info->m[PSC_POWER] =
  			coefficients[pindex].m * shunt / 1000;
  		info->b[PSC_POWER] = coefficients[pindex].b;
  		info->R[PSC_POWER] = coefficients[pindex].R;
  	}
  	if (tindex >= 0) {
  		info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
  		info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
  		info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
  	}
  
  	return pmbus_do_probe(client, id, info);
  }
  
  static struct i2c_driver adm1275_driver = {
  	.driver = {
  		   .name = "adm1275",
  		   },
  	.probe = adm1275_probe,
  	.remove = pmbus_do_remove,
  	.id_table = adm1275_id,
  };
  
  module_i2c_driver(adm1275_driver);
  
  MODULE_AUTHOR("Guenter Roeck");
  MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
  MODULE_LICENSE("GPL");
  