[mirror_ubuntu-jammy-kernel.git] / drivers / hwmon / pmbus / zl6100.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for ZL6100 and compatibles
 *
 * Copyright (c) 2011 Ericsson AB.
 * Copyright (c) 2012 Guenter Roeck
 */

#include <linux/bitops.h>
#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/ktime.h>
#include <linux/delay.h>
#include "pmbus.h"

enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
	     zl8802, zl9101, zl9117, zls1003, zls4009 };

struct zl6100_data {
	int id;
	ktime_t access;		/* chip access time */
	int delay;		/* Delay between chip accesses in uS */
	struct pmbus_driver_info info;
};

#define to_zl6100_data(x)  container_of(x, struct zl6100_data, info)

#define ZL6100_MFR_CONFIG		0xd0
#define ZL6100_DEVICE_ID		0xe4

#define ZL6100_MFR_XTEMP_ENABLE		BIT(7)

#define ZL8802_MFR_USER_GLOBAL_CONFIG	0xe9
#define ZL8802_MFR_TMON_ENABLE		BIT(12)
#define ZL8802_MFR_USER_CONFIG		0xd1
#define ZL8802_MFR_XTEMP_ENABLE_2	BIT(1)
#define ZL8802_MFR_DDC_CONFIG		0xd3
#define ZL8802_MFR_PHASES_MASK		0x0007

#define MFR_VMON_OV_FAULT_LIMIT		0xf5
#define MFR_VMON_UV_FAULT_LIMIT		0xf6
#define MFR_READ_VMON			0xf7

#define VMON_UV_WARNING			BIT(5)
#define VMON_OV_WARNING			BIT(4)
#define VMON_UV_FAULT			BIT(1)
#define VMON_OV_FAULT			BIT(0)

#define ZL6100_WAIT_TIME		1000	/* uS	*/

static ushort delay = ZL6100_WAIT_TIME;
module_param(delay, ushort, 0644);
MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");

/* Convert linear sensor value to milli-units */
static long zl6100_l2d(s16 l)
{
	s16 exponent;
	s32 mantissa;
	long val;

	exponent = l >> 11;
	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;

	val = mantissa;

	/* scale result to milli-units */
	val = val * 1000L;

	if (exponent >= 0)
		val <<= exponent;
	else
		val >>= -exponent;

	return val;
}

#define MAX_MANTISSA	(1023 * 1000)
#define MIN_MANTISSA	(511 * 1000)

static u16 zl6100_d2l(long val)
{
	s16 exponent = 0, mantissa;
	bool negative = false;

	/* simple case */
	if (val == 0)
		return 0;

	if (val < 0) {
		negative = true;
		val = -val;
	}

	/* Reduce large mantissa until it fits into 10 bit */
	while (val >= MAX_MANTISSA && exponent < 15) {
		exponent++;
		val >>= 1;
	}
	/* Increase small mantissa to improve precision */
	while (val < MIN_MANTISSA && exponent > -15) {
		exponent--;
		val <<= 1;
	}

	/* Convert mantissa from milli-units to units */
	mantissa = DIV_ROUND_CLOSEST(val, 1000);

	/* Ensure that resulting number is within range */
	if (mantissa > 0x3ff)
		mantissa = 0x3ff;

	/* restore sign */
	if (negative)
		mantissa = -mantissa;

	/* Convert to 5 bit exponent, 11 bit mantissa */
	return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
}

/* Some chips need a delay between accesses */
static inline void zl6100_wait(const struct zl6100_data *data)
{
	if (data->delay) {
		s64 delta = ktime_us_delta(ktime_get(), data->access);
		if (delta < data->delay)
			udelay(data->delay - delta);
	}
}

static int zl6100_read_word_data(struct i2c_client *client, int page,
				 int phase, int reg)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret, vreg;

	if (page >= info->pages)
		return -ENXIO;

	if (data->id == zl2005) {
		/*
		 * Limit register detection is not reliable on ZL2005.
		 * Make sure registers are not erroneously detected.
		 */
		switch (reg) {
		case PMBUS_VOUT_OV_WARN_LIMIT:
		case PMBUS_VOUT_UV_WARN_LIMIT:
		case PMBUS_IOUT_OC_WARN_LIMIT:
			return -ENXIO;
		}
	}

	switch (reg) {
	case PMBUS_VIRT_READ_VMON:
		vreg = MFR_READ_VMON;
		break;
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
		vreg = MFR_VMON_OV_FAULT_LIMIT;
		break;
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
		vreg = MFR_VMON_UV_FAULT_LIMIT;
		break;
	default:
		if (reg >= PMBUS_VIRT_BASE)
			return -ENXIO;
		vreg = reg;
		break;
	}

	zl6100_wait(data);
	ret = pmbus_read_word_data(client, page, phase, vreg);
	data->access = ktime_get();
	if (ret < 0)
		return ret;

	switch (reg) {
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
		break;
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
		ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
		break;
	}

	return ret;
}

static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret, status;

	if (page >= info->pages)
		return -ENXIO;

	zl6100_wait(data);

	switch (reg) {
	case PMBUS_VIRT_STATUS_VMON:
		ret = pmbus_read_byte_data(client, 0,
					   PMBUS_STATUS_MFR_SPECIFIC);
		if (ret < 0)
			break;

		status = 0;
		if (ret & VMON_UV_WARNING)
			status |= PB_VOLTAGE_UV_WARNING;
		if (ret & VMON_OV_WARNING)
			status |= PB_VOLTAGE_OV_WARNING;
		if (ret & VMON_UV_FAULT)
			status |= PB_VOLTAGE_UV_FAULT;
		if (ret & VMON_OV_FAULT)
			status |= PB_VOLTAGE_OV_FAULT;
		ret = status;
		break;
	default:
		ret = pmbus_read_byte_data(client, page, reg);
		break;
	}
	data->access = ktime_get();

	return ret;
}

static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
				  u16 word)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret, vreg;

	if (page >= info->pages)
		return -ENXIO;

	switch (reg) {
	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
		vreg = MFR_VMON_OV_FAULT_LIMIT;
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
		vreg = MFR_VMON_OV_FAULT_LIMIT;
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
		word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
		vreg = MFR_VMON_UV_FAULT_LIMIT;
		pmbus_clear_cache(client);
		break;
	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
		vreg = MFR_VMON_UV_FAULT_LIMIT;
		pmbus_clear_cache(client);
		break;
	default:
		if (reg >= PMBUS_VIRT_BASE)
			return -ENXIO;
		vreg = reg;
	}

	zl6100_wait(data);
	ret = pmbus_write_word_data(client, page, vreg, word);
	data->access = ktime_get();

	return ret;
}

static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
{
	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	struct zl6100_data *data = to_zl6100_data(info);
	int ret;

	if (page >= info->pages)
		return -ENXIO;

	zl6100_wait(data);
	ret = pmbus_write_byte(client, page, value);
	data->access = ktime_get();

	return ret;
}

static const struct i2c_device_id zl6100_id[] = {
	{"bmr450", zl2005},
	{"bmr451", zl2005},
	{"bmr462", zl2008},
	{"bmr463", zl2008},
	{"bmr464", zl2008},
	{"bmr465", zls4009},
	{"bmr466", zls1003},
	{"bmr467", zls4009},
	{"bmr469", zl8802},
	{"zl2004", zl2004},
	{"zl2005", zl2005},
	{"zl2006", zl2006},
	{"zl2008", zl2008},
	{"zl2105", zl2105},
	{"zl2106", zl2106},
	{"zl6100", zl6100},
	{"zl6105", zl6105},
	{"zl8802", zl8802},
	{"zl9101", zl9101},
	{"zl9117", zl9117},
	{"zls1003", zls1003},
	{"zls4009", zls4009},
	{ }
};
MODULE_DEVICE_TABLE(i2c, zl6100_id);

static int zl6100_probe(struct i2c_client *client)
{
	int ret, i;
	struct zl6100_data *data;
	struct pmbus_driver_info *info;
	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	const struct i2c_device_id *mid;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_READ_WORD_DATA
				     | I2C_FUNC_SMBUS_READ_BLOCK_DATA))
		return -ENODEV;

	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
					device_id);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read device ID\n");
		return ret;
	}
	device_id[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", device_id);

	mid = NULL;
	for (mid = zl6100_id; mid->name[0]; mid++) {
		if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
			break;
	}
	if (!mid->name[0]) {
		dev_err(&client->dev, "Unsupported device\n");
		return -ENODEV;
	}
	if (strcmp(client->name, mid->name) != 0)
		dev_notice(&client->dev,
			   "Device mismatch: Configured %s, detected %s\n",
			   client->name, mid->name);

	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->id = mid->driver_data;

	/*
	 * According to information from the chip vendor, all currently
	 * supported chips are known to require a wait time between I2C
	 * accesses.
	 */
	data->delay = delay;

	/*
	 * Since there was a direct I2C device access above, wait before
	 * accessing the chip again.
	 */
	data->access = ktime_get();
	zl6100_wait(data);

	info = &data->info;

	info->pages = 1;
	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
	  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
	  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;

	/*
	 * ZL2004, ZL8802, ZL9101M, ZL9117M and ZLS4009 support monitoring
	 * an extra voltage (VMON for ZL2004, ZL8802 and ZLS4009,
	 * VDRV for ZL9101M and ZL9117M). Report it as vmon.
	 */
	if (data->id == zl2004 || data->id == zl8802 || data->id == zl9101 ||
	    data->id == zl9117 || data->id == zls4009)
		info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;

	/*
	 * ZL8802 has two outputs that can be used either independently or in
	 * a current sharing configuration. The driver uses the DDC_CONFIG
	 * register to check if the module is running with independent or
	 * shared outputs. If the module is in shared output mode, only one
	 * output voltage will be reported.
	 */
	if (data->id == zl8802) {
		info->pages = 2;
		info->func[0] |= PMBUS_HAVE_IIN;

		ret = i2c_smbus_read_word_data(client, ZL8802_MFR_DDC_CONFIG);
		if (ret < 0)
			return ret;

		data->access = ktime_get();
		zl6100_wait(data);

		if (ret & ZL8802_MFR_PHASES_MASK)
			info->func[1] |= PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
		else
			info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
				| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;

		for (i = 0; i < 2; i++) {
			ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
			if (ret < 0)
				return ret;

			data->access = ktime_get();
			zl6100_wait(data);

			ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_CONFIG);
			if (ret < 0)
				return ret;

			if (ret & ZL8802_MFR_XTEMP_ENABLE_2)
				info->func[i] |= PMBUS_HAVE_TEMP2;

			data->access = ktime_get();
			zl6100_wait(data);
		}
		ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_GLOBAL_CONFIG);
		if (ret < 0)
			return ret;

		if (ret & ZL8802_MFR_TMON_ENABLE)
			info->func[0] |= PMBUS_HAVE_TEMP3;
	} else {
		ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
		if (ret < 0)
			return ret;

		if (ret & ZL6100_MFR_XTEMP_ENABLE)
			info->func[0] |= PMBUS_HAVE_TEMP2;
	}

	data->access = ktime_get();
	zl6100_wait(data);

	info->read_word_data = zl6100_read_word_data;
	info->read_byte_data = zl6100_read_byte_data;
	info->write_word_data = zl6100_write_word_data;
	info->write_byte = zl6100_write_byte;

	return pmbus_do_probe(client, info);
}

static struct i2c_driver zl6100_driver = {
	.driver = {
		   .name = "zl6100",
		   },
	.probe_new = zl6100_probe,
	.id_table = zl6100_id,
};

module_i2c_driver(zl6100_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
200855e5 GR	2	/*
	3	* Hardware monitoring driver for ZL6100 and compatibles
	4	*
	5	* Copyright (c) 2011 Ericsson AB.
1640eaec	6	* Copyright (c) 2012 Guenter Roeck
200855e5 GR	7	*/
200855e5 GR	8
2c052d42	9	#include <linux/bitops.h>
200855e5 GR	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/err.h>
	14	#include <linux/slab.h>
	15	#include <linux/i2c.h>
	16	#include <linux/ktime.h>
	17	#include <linux/delay.h>
	18	#include "pmbus.h"
	19
3360a106	20	enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
ab9d85e9	21	zl8802, zl9101, zl9117, zls1003, zls4009 };
200855e5 GR	22
	23	struct zl6100_data {
	24	int id;
	25	ktime_t access; /* chip access time */
7ad6307a	26	int delay; /* Delay between chip accesses in uS */
200855e5 GR	27	struct pmbus_driver_info info;
	28	};
	29
	30	#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
	31
56badacb	32	#define ZL6100_MFR_CONFIG 0xd0
200855e5 GR	33	#define ZL6100_DEVICE_ID 0xe4
200855e5 GR	34
2c052d42	35	#define ZL6100_MFR_XTEMP_ENABLE BIT(7)
56badacb	36
ab9d85e9 ER	37	#define ZL8802_MFR_USER_GLOBAL_CONFIG 0xe9
	38	#define ZL8802_MFR_TMON_ENABLE BIT(12)
	39	#define ZL8802_MFR_USER_CONFIG 0xd1
	40	#define ZL8802_MFR_XTEMP_ENABLE_2 BIT(1)
	41	#define ZL8802_MFR_DDC_CONFIG 0xd3
	42	#define ZL8802_MFR_PHASES_MASK 0x0007
	43
1640eaec GR	44	#define MFR_VMON_OV_FAULT_LIMIT 0xf5
	45	#define MFR_VMON_UV_FAULT_LIMIT 0xf6
	46	#define MFR_READ_VMON 0xf7
	47
2c052d42 GR	48	#define VMON_UV_WARNING BIT(5)
	49	#define VMON_OV_WARNING BIT(4)
	50	#define VMON_UV_FAULT BIT(1)
	51	#define VMON_OV_FAULT BIT(0)
1640eaec	52
200855e5 GR	53	#define ZL6100_WAIT_TIME 1000 /* uS */
	54
	55	static ushort delay = ZL6100_WAIT_TIME;
	56	module_param(delay, ushort, 0644);
	57	MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
	58
1640eaec GR	59	/* Convert linear sensor value to milli-units */
	60	static long zl6100_l2d(s16 l)
	61	{
	62	s16 exponent;
	63	s32 mantissa;
	64	long val;
	65
	66	exponent = l >> 11;
	67	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
	68
	69	val = mantissa;
	70
	71	/* scale result to milli-units */
	72	val = val * 1000L;
	73
	74	if (exponent >= 0)
	75	val <<= exponent;
	76	else
	77	val >>= -exponent;
	78
	79	return val;
	80	}
	81
	82	#define MAX_MANTISSA (1023 * 1000)
	83	#define MIN_MANTISSA (511 * 1000)
	84
	85	static u16 zl6100_d2l(long val)
	86	{
	87	s16 exponent = 0, mantissa;
	88	bool negative = false;
	89
	90	/* simple case */
	91	if (val == 0)
	92	return 0;
	93
	94	if (val < 0) {
	95	negative = true;
	96	val = -val;
	97	}
	98
	99	/* Reduce large mantissa until it fits into 10 bit */
	100	while (val >= MAX_MANTISSA && exponent < 15) {
	101	exponent++;
	102	val >>= 1;
	103	}
	104	/* Increase small mantissa to improve precision */
	105	while (val < MIN_MANTISSA && exponent > -15) {
	106	exponent--;
	107	val <<= 1;
	108	}
	109
	110	/* Convert mantissa from milli-units to units */
	111	mantissa = DIV_ROUND_CLOSEST(val, 1000);
	112
	113	/* Ensure that resulting number is within range */
	114	if (mantissa > 0x3ff)
	115	mantissa = 0x3ff;
	116
	117	/* restore sign */
	118	if (negative)
	119	mantissa = -mantissa;
	120
	121	/* Convert to 5 bit exponent, 11 bit mantissa */
	122	return (mantissa & 0x7ff) \| ((exponent << 11) & 0xf800);
123	}
124
200855e5 GR	125	/* Some chips need a delay between accesses */
	126	static inline void zl6100_wait(const struct zl6100_data *data)
	127	{
7ad6307a	128	if (data->delay) {
200855e5	129	s64 delta = ktime_us_delta(ktime_get(), data->access);
7ad6307a GR	130	if (delta < data->delay)
7ad6307a GR	131	udelay(data->delay - delta);
200855e5 GR	132	}
	133	}
	134
43f33b6e GR	135	static int zl6100_read_word_data(struct i2c_client *client, int page,
43f33b6e GR	136	int phase, int reg)
200855e5 GR	137	{
	138	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	139	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	140	int ret, vreg;
200855e5	141
ab9d85e9	142	if (page >= info->pages)
200855e5 GR	143	return -ENXIO;
200855e5 GR	144
bc581e6f GR	145	if (data->id == zl2005) {
	146	/*
	147	* Limit register detection is not reliable on ZL2005.
	148	* Make sure registers are not erroneously detected.
	149	*/
	150	switch (reg) {
	151	case PMBUS_VOUT_OV_WARN_LIMIT:
	152	case PMBUS_VOUT_UV_WARN_LIMIT:
	153	case PMBUS_IOUT_OC_WARN_LIMIT:
	154	return -ENXIO;
	155	}
	156	}
	157
1640eaec GR	158	switch (reg) {
	159	case PMBUS_VIRT_READ_VMON:
	160	vreg = MFR_READ_VMON;
	161	break;
	162	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	163	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	164	vreg = MFR_VMON_OV_FAULT_LIMIT;
	165	break;
	166	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	167	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	168	vreg = MFR_VMON_UV_FAULT_LIMIT;
	169	break;
	170	default:
	171	if (reg >= PMBUS_VIRT_BASE)
	172	return -ENXIO;
	173	vreg = reg;
	174	break;
	175	}
	176
200855e5	177	zl6100_wait(data);
43f33b6e	178	ret = pmbus_read_word_data(client, page, phase, vreg);
200855e5	179	data->access = ktime_get();
1640eaec GR	180	if (ret < 0)
	181	return ret;
	182
	183	switch (reg) {
	184	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	185	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
	186	break;
	187	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	188	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
	189	break;
	190	}
200855e5 GR	191
	192	return ret;
	193	}
	194
	195	static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
	196	{
	197	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	198	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	199	int ret, status;
200855e5	200
ab9d85e9	201	if (page >= info->pages)
200855e5 GR	202	return -ENXIO;
	203
	204	zl6100_wait(data);
1640eaec GR	205
	206	switch (reg) {
	207	case PMBUS_VIRT_STATUS_VMON:
	208	ret = pmbus_read_byte_data(client, 0,
	209	PMBUS_STATUS_MFR_SPECIFIC);
	210	if (ret < 0)
	211	break;
	212
	213	status = 0;
	214	if (ret & VMON_UV_WARNING)
	215	status \|= PB_VOLTAGE_UV_WARNING;
	216	if (ret & VMON_OV_WARNING)
	217	status \|= PB_VOLTAGE_OV_WARNING;
	218	if (ret & VMON_UV_FAULT)
	219	status \|= PB_VOLTAGE_UV_FAULT;
	220	if (ret & VMON_OV_FAULT)
	221	status \|= PB_VOLTAGE_OV_FAULT;
	222	ret = status;
	223	break;
	224	default:
	225	ret = pmbus_read_byte_data(client, page, reg);
	226	break;
	227	}
200855e5 GR	228	data->access = ktime_get();
	229
	230	return ret;
	231	}
	232
	233	static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
	234	u16 word)
	235	{
	236	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	237	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	238	int ret, vreg;
200855e5	239
ab9d85e9	240	if (page >= info->pages)
200855e5 GR	241	return -ENXIO;
200855e5 GR	242
1640eaec GR	243	switch (reg) {
	244	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	245	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
	246	vreg = MFR_VMON_OV_FAULT_LIMIT;
	247	pmbus_clear_cache(client);
	248	break;
	249	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	250	vreg = MFR_VMON_OV_FAULT_LIMIT;
	251	pmbus_clear_cache(client);
	252	break;
	253	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	254	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
	255	vreg = MFR_VMON_UV_FAULT_LIMIT;
	256	pmbus_clear_cache(client);
	257	break;
	258	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	259	vreg = MFR_VMON_UV_FAULT_LIMIT;
	260	pmbus_clear_cache(client);
	261	break;
	262	default:
	263	if (reg >= PMBUS_VIRT_BASE)
	264	return -ENXIO;
	265	vreg = reg;
	266	}
	267
200855e5	268	zl6100_wait(data);
1640eaec	269	ret = pmbus_write_word_data(client, page, vreg, word);
200855e5 GR	270	data->access = ktime_get();
	271
	272	return ret;
	273	}
	274
	275	static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
	276	{
	277	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	278	struct zl6100_data *data = to_zl6100_data(info);
	279	int ret;
	280
ab9d85e9	281	if (page >= info->pages)
200855e5 GR	282	return -ENXIO;
	283
	284	zl6100_wait(data);
	285	ret = pmbus_write_byte(client, page, value);
	286	data->access = ktime_get();
	287
	288	return ret;
	289	}
	290
	291	static const struct i2c_device_id zl6100_id[] = {
443830f6 GR	292	{"bmr450", zl2005},
	293	{"bmr451", zl2005},
	294	{"bmr462", zl2008},
	295	{"bmr463", zl2008},
	296	{"bmr464", zl2008},
ab9d85e9 ER	297	{"bmr465", zls4009},
	298	{"bmr466", zls1003},
	299	{"bmr467", zls4009},
	300	{"bmr469", zl8802},
200855e5	301	{"zl2004", zl2004},
bc581e6f	302	{"zl2005", zl2005},
200855e5 GR	303	{"zl2006", zl2006},
	304	{"zl2008", zl2008},
	305	{"zl2105", zl2105},
	306	{"zl2106", zl2106},
	307	{"zl6100", zl6100},
	308	{"zl6105", zl6105},
ab9d85e9	309	{"zl8802", zl8802},
3360a106 GR	310	{"zl9101", zl9101},
3360a106 GR	311	{"zl9117", zl9117},
ab9d85e9 ER	312	{"zls1003", zls1003},
ab9d85e9 ER	313	{"zls4009", zls4009},
200855e5 GR	314	{ }
	315	};
	316	MODULE_DEVICE_TABLE(i2c, zl6100_id);
	317
dd431939	318	static int zl6100_probe(struct i2c_client *client)
200855e5	319	{
ab9d85e9	320	int ret, i;
200855e5 GR	321	struct zl6100_data *data;
	322	struct pmbus_driver_info *info;
	323	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	324	const struct i2c_device_id *mid;
	325
	326	if (!i2c_check_functionality(client->adapter,
56badacb	327	I2C_FUNC_SMBUS_READ_WORD_DATA
200855e5 GR	328	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	329	return -ENODEV;
	330
	331	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
	332	device_id);
	333	if (ret < 0) {
	334	dev_err(&client->dev, "Failed to read device ID\n");
	335	return ret;
	336	}
	337	device_id[ret] = '\0';
	338	dev_info(&client->dev, "Device ID %s\n", device_id);
	339
	340	mid = NULL;
	341	for (mid = zl6100_id; mid->name[0]; mid++) {
	342	if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
	343	break;
	344	}
	345	if (!mid->name[0]) {
	346	dev_err(&client->dev, "Unsupported device\n");
	347	return -ENODEV;
	348	}
dd431939	349	if (strcmp(client->name, mid->name) != 0)
200855e5 GR	350	dev_notice(&client->dev,
200855e5 GR	351	"Device mismatch: Configured %s, detected %s\n",
dd431939	352	client->name, mid->name);
200855e5	353
8b313ca7 GR	354	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
8b313ca7 GR	355	GFP_KERNEL);
200855e5 GR	356	if (!data)
	357	return -ENOMEM;
	358
	359	data->id = mid->driver_data;
	360
	361	/*
fecfb644 GR	362	* According to information from the chip vendor, all currently
	363	* supported chips are known to require a wait time between I2C
	364	* accesses.
200855e5	365	*/
7ad6307a	366	data->delay = delay;
200855e5 GR	367
	368	/*
	369	* Since there was a direct I2C device access above, wait before
	370	* accessing the chip again.
200855e5 GR	371	*/
	372	data->access = ktime_get();
	373	zl6100_wait(data);
200855e5 GR	374
	375	info = &data->info;
	376
	377	info->pages = 1;
	378	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT
	379	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	380	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT
56badacb GR	381	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;
56badacb GR	382
1640eaec	383	/*
ab9d85e9 ER	384	* ZL2004, ZL8802, ZL9101M, ZL9117M and ZLS4009 support monitoring
	385	* an extra voltage (VMON for ZL2004, ZL8802 and ZLS4009,
	386	* VDRV for ZL9101M and ZL9117M). Report it as vmon.
1640eaec	387	*/
ab9d85e9 ER	388	if (data->id == zl2004 \|\| data->id == zl8802 \|\| data->id == zl9101 \|\|
ab9d85e9 ER	389	data->id == zl9117 \|\| data->id == zls4009)
1640eaec GR	390	info->func[0] \|= PMBUS_HAVE_VMON \| PMBUS_HAVE_STATUS_VMON;
1640eaec GR	391
ab9d85e9 ER	392	/*
	393	* ZL8802 has two outputs that can be used either independently or in
	394	* a current sharing configuration. The driver uses the DDC_CONFIG
	395	* register to check if the module is running with independent or
	396	* shared outputs. If the module is in shared output mode, only one
	397	* output voltage will be reported.
	398	*/
	399	if (data->id == zl8802) {
	400	info->pages = 2;
	401	info->func[0] \|= PMBUS_HAVE_IIN;
	402
	403	ret = i2c_smbus_read_word_data(client, ZL8802_MFR_DDC_CONFIG);
	404	if (ret < 0)
	405	return ret;
	406
	407	data->access = ktime_get();
	408	zl6100_wait(data);
	409
	410	if (ret & ZL8802_MFR_PHASES_MASK)
	411	info->func[1] \|= PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT;
	412	else
	413	info->func[1] = PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	414	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT;
8b313ca7	415
ab9d85e9 ER	416	for (i = 0; i < 2; i++) {
	417	ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
	418	if (ret < 0)
	419	return ret;
	420
	421	data->access = ktime_get();
	422	zl6100_wait(data);
	423
	424	ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_CONFIG);
	425	if (ret < 0)
	426	return ret;
	427
	428	if (ret & ZL8802_MFR_XTEMP_ENABLE_2)
	429	info->func[i] \|= PMBUS_HAVE_TEMP2;
	430
	431	data->access = ktime_get();
	432	zl6100_wait(data);
	433	}
	434	ret = i2c_smbus_read_word_data(client, ZL8802_MFR_USER_GLOBAL_CONFIG);
	435	if (ret < 0)
	436	return ret;
	437
	438	if (ret & ZL8802_MFR_TMON_ENABLE)
	439	info->func[0] \|= PMBUS_HAVE_TEMP3;
	440	} else {
	441	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
	442	if (ret < 0)
	443	return ret;
	444
	445	if (ret & ZL6100_MFR_XTEMP_ENABLE)
	446	info->func[0] \|= PMBUS_HAVE_TEMP2;
	447	}
56badacb GR	448
	449	data->access = ktime_get();
	450	zl6100_wait(data);
200855e5 GR	451
	452	info->read_word_data = zl6100_read_word_data;
	453	info->read_byte_data = zl6100_read_byte_data;
	454	info->write_word_data = zl6100_write_word_data;
	455	info->write_byte = zl6100_write_byte;
	456
dd431939	457	return pmbus_do_probe(client, info);
200855e5 GR	458	}
200855e5 GR	459
200855e5 GR	460	static struct i2c_driver zl6100_driver = {
	461	.driver = {
	462	.name = "zl6100",
	463	},
dd431939	464	.probe_new = zl6100_probe,
200855e5 GR	465	.id_table = zl6100_id,
	466	};
	467
f0967eea	468	module_i2c_driver(zl6100_driver);
200855e5 GR	469
	470	MODULE_AUTHOR("Guenter Roeck");
	471	MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
	472	MODULE_LICENSE("GPL");
b94ca77e	473	MODULE_IMPORT_NS(PMBUS);