[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,
	     zl9101, zl9117 };

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 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 > 0)
		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 > 0)
		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 > 0)
		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 > 0)
		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},
	{"zl2004", zl2004},
	{"zl2005", zl2005},
	{"zl2006", zl2006},
	{"zl2008", zl2008},
	{"zl2105", zl2105},
	{"zl2106", zl2106},
	{"zl6100", zl6100},
	{"zl6105", zl6105},
	{"zl9101", zl9101},
	{"zl9117", zl9117},
	{ }
};
MODULE_DEVICE_TABLE(i2c, zl6100_id);

static int zl6100_probe(struct i2c_client *client)
{
	int ret;
	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, ZL9101M, and ZL9117M support monitoring an extra voltage
	 * (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
	 */
	if (data->id == zl2004 || data->id == zl9101 || data->id == zl9117)
		info->func[0] |= PMBUS_HAVE_VMON | PMBUS_HAVE_STATUS_VMON;

	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");
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 GR	20	enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
3360a106 GR	21	zl9101, zl9117 };
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
1640eaec GR	37	#define MFR_VMON_OV_FAULT_LIMIT 0xf5
	38	#define MFR_VMON_UV_FAULT_LIMIT 0xf6
	39	#define MFR_READ_VMON 0xf7
	40
2c052d42 GR	41	#define VMON_UV_WARNING BIT(5)
	42	#define VMON_OV_WARNING BIT(4)
	43	#define VMON_UV_FAULT BIT(1)
	44	#define VMON_OV_FAULT BIT(0)
1640eaec	45
200855e5 GR	46	#define ZL6100_WAIT_TIME 1000 /* uS */
	47
	48	static ushort delay = ZL6100_WAIT_TIME;
	49	module_param(delay, ushort, 0644);
	50	MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
	51
1640eaec GR	52	/* Convert linear sensor value to milli-units */
	53	static long zl6100_l2d(s16 l)
	54	{
	55	s16 exponent;
	56	s32 mantissa;
	57	long val;
	58
	59	exponent = l >> 11;
	60	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
	61
	62	val = mantissa;
	63
	64	/* scale result to milli-units */
	65	val = val * 1000L;
	66
	67	if (exponent >= 0)
	68	val <<= exponent;
	69	else
	70	val >>= -exponent;
	71
	72	return val;
	73	}
	74
	75	#define MAX_MANTISSA (1023 * 1000)
	76	#define MIN_MANTISSA (511 * 1000)
	77
	78	static u16 zl6100_d2l(long val)
	79	{
	80	s16 exponent = 0, mantissa;
	81	bool negative = false;
	82
	83	/* simple case */
	84	if (val == 0)
	85	return 0;
	86
	87	if (val < 0) {
	88	negative = true;
	89	val = -val;
	90	}
	91
	92	/* Reduce large mantissa until it fits into 10 bit */
	93	while (val >= MAX_MANTISSA && exponent < 15) {
	94	exponent++;
	95	val >>= 1;
	96	}
	97	/* Increase small mantissa to improve precision */
	98	while (val < MIN_MANTISSA && exponent > -15) {
	99	exponent--;
	100	val <<= 1;
	101	}
	102
	103	/* Convert mantissa from milli-units to units */
	104	mantissa = DIV_ROUND_CLOSEST(val, 1000);
	105
	106	/* Ensure that resulting number is within range */
	107	if (mantissa > 0x3ff)
	108	mantissa = 0x3ff;
	109
	110	/* restore sign */
	111	if (negative)
	112	mantissa = -mantissa;
	113
	114	/* Convert to 5 bit exponent, 11 bit mantissa */
	115	return (mantissa & 0x7ff) \| ((exponent << 11) & 0xf800);
116	}
117
200855e5 GR	118	/* Some chips need a delay between accesses */
	119	static inline void zl6100_wait(const struct zl6100_data *data)
	120	{
7ad6307a	121	if (data->delay) {
200855e5	122	s64 delta = ktime_us_delta(ktime_get(), data->access);
7ad6307a GR	123	if (delta < data->delay)
7ad6307a GR	124	udelay(data->delay - delta);
200855e5 GR	125	}
	126	}
	127
43f33b6e GR	128	static int zl6100_read_word_data(struct i2c_client *client, int page,
43f33b6e GR	129	int phase, int reg)
200855e5 GR	130	{
	131	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	132	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	133	int ret, vreg;
200855e5	134
1640eaec	135	if (page > 0)
200855e5 GR	136	return -ENXIO;
200855e5 GR	137
bc581e6f GR	138	if (data->id == zl2005) {
	139	/*
	140	* Limit register detection is not reliable on ZL2005.
	141	* Make sure registers are not erroneously detected.
	142	*/
	143	switch (reg) {
	144	case PMBUS_VOUT_OV_WARN_LIMIT:
	145	case PMBUS_VOUT_UV_WARN_LIMIT:
	146	case PMBUS_IOUT_OC_WARN_LIMIT:
	147	return -ENXIO;
	148	}
	149	}
	150
1640eaec GR	151	switch (reg) {
	152	case PMBUS_VIRT_READ_VMON:
	153	vreg = MFR_READ_VMON;
	154	break;
	155	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	156	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	157	vreg = MFR_VMON_OV_FAULT_LIMIT;
	158	break;
	159	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	160	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	161	vreg = MFR_VMON_UV_FAULT_LIMIT;
	162	break;
	163	default:
	164	if (reg >= PMBUS_VIRT_BASE)
	165	return -ENXIO;
	166	vreg = reg;
	167	break;
	168	}
	169
200855e5	170	zl6100_wait(data);
43f33b6e	171	ret = pmbus_read_word_data(client, page, phase, vreg);
200855e5	172	data->access = ktime_get();
1640eaec GR	173	if (ret < 0)
	174	return ret;
	175
	176	switch (reg) {
	177	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	178	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
	179	break;
	180	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	181	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
	182	break;
	183	}
200855e5 GR	184
	185	return ret;
	186	}
	187
	188	static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
	189	{
	190	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	191	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	192	int ret, status;
200855e5 GR	193
	194	if (page > 0)
	195	return -ENXIO;
	196
	197	zl6100_wait(data);
1640eaec GR	198
	199	switch (reg) {
	200	case PMBUS_VIRT_STATUS_VMON:
	201	ret = pmbus_read_byte_data(client, 0,
	202	PMBUS_STATUS_MFR_SPECIFIC);
	203	if (ret < 0)
	204	break;
	205
	206	status = 0;
	207	if (ret & VMON_UV_WARNING)
	208	status \|= PB_VOLTAGE_UV_WARNING;
	209	if (ret & VMON_OV_WARNING)
	210	status \|= PB_VOLTAGE_OV_WARNING;
	211	if (ret & VMON_UV_FAULT)
	212	status \|= PB_VOLTAGE_UV_FAULT;
	213	if (ret & VMON_OV_FAULT)
	214	status \|= PB_VOLTAGE_OV_FAULT;
	215	ret = status;
	216	break;
	217	default:
	218	ret = pmbus_read_byte_data(client, page, reg);
	219	break;
	220	}
200855e5 GR	221	data->access = ktime_get();
	222
	223	return ret;
	224	}
	225
	226	static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
	227	u16 word)
	228	{
	229	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	230	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	231	int ret, vreg;
200855e5	232
1640eaec	233	if (page > 0)
200855e5 GR	234	return -ENXIO;
200855e5 GR	235
1640eaec GR	236	switch (reg) {
	237	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	238	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
	239	vreg = MFR_VMON_OV_FAULT_LIMIT;
	240	pmbus_clear_cache(client);
	241	break;
	242	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	243	vreg = MFR_VMON_OV_FAULT_LIMIT;
	244	pmbus_clear_cache(client);
	245	break;
	246	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	247	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
	248	vreg = MFR_VMON_UV_FAULT_LIMIT;
	249	pmbus_clear_cache(client);
	250	break;
	251	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	252	vreg = MFR_VMON_UV_FAULT_LIMIT;
	253	pmbus_clear_cache(client);
	254	break;
	255	default:
	256	if (reg >= PMBUS_VIRT_BASE)
	257	return -ENXIO;
	258	vreg = reg;
	259	}
	260
200855e5	261	zl6100_wait(data);
1640eaec	262	ret = pmbus_write_word_data(client, page, vreg, word);
200855e5 GR	263	data->access = ktime_get();
	264
	265	return ret;
	266	}
	267
	268	static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
	269	{
	270	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	271	struct zl6100_data *data = to_zl6100_data(info);
	272	int ret;
	273
	274	if (page > 0)
	275	return -ENXIO;
	276
	277	zl6100_wait(data);
	278	ret = pmbus_write_byte(client, page, value);
	279	data->access = ktime_get();
	280
	281	return ret;
	282	}
	283
	284	static const struct i2c_device_id zl6100_id[] = {
443830f6 GR	285	{"bmr450", zl2005},
	286	{"bmr451", zl2005},
	287	{"bmr462", zl2008},
	288	{"bmr463", zl2008},
	289	{"bmr464", zl2008},
200855e5	290	{"zl2004", zl2004},
bc581e6f	291	{"zl2005", zl2005},
200855e5 GR	292	{"zl2006", zl2006},
	293	{"zl2008", zl2008},
	294	{"zl2105", zl2105},
	295	{"zl2106", zl2106},
	296	{"zl6100", zl6100},
	297	{"zl6105", zl6105},
3360a106 GR	298	{"zl9101", zl9101},
3360a106 GR	299	{"zl9117", zl9117},
200855e5 GR	300	{ }
	301	};
	302	MODULE_DEVICE_TABLE(i2c, zl6100_id);
	303
dd431939	304	static int zl6100_probe(struct i2c_client *client)
200855e5 GR	305	{
	306	int ret;
	307	struct zl6100_data *data;
	308	struct pmbus_driver_info *info;
	309	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	310	const struct i2c_device_id *mid;
	311
	312	if (!i2c_check_functionality(client->adapter,
56badacb	313	I2C_FUNC_SMBUS_READ_WORD_DATA
200855e5 GR	314	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	315	return -ENODEV;
	316
	317	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
	318	device_id);
	319	if (ret < 0) {
	320	dev_err(&client->dev, "Failed to read device ID\n");
	321	return ret;
	322	}
	323	device_id[ret] = '\0';
	324	dev_info(&client->dev, "Device ID %s\n", device_id);
	325
	326	mid = NULL;
	327	for (mid = zl6100_id; mid->name[0]; mid++) {
	328	if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
	329	break;
	330	}
	331	if (!mid->name[0]) {
	332	dev_err(&client->dev, "Unsupported device\n");
	333	return -ENODEV;
	334	}
dd431939	335	if (strcmp(client->name, mid->name) != 0)
200855e5 GR	336	dev_notice(&client->dev,
200855e5 GR	337	"Device mismatch: Configured %s, detected %s\n",
dd431939	338	client->name, mid->name);
200855e5	339
8b313ca7 GR	340	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
8b313ca7 GR	341	GFP_KERNEL);
200855e5 GR	342	if (!data)
	343	return -ENOMEM;
	344
	345	data->id = mid->driver_data;
	346
	347	/*
fecfb644 GR	348	* According to information from the chip vendor, all currently
	349	* supported chips are known to require a wait time between I2C
	350	* accesses.
200855e5	351	*/
7ad6307a	352	data->delay = delay;
200855e5 GR	353
	354	/*
	355	* Since there was a direct I2C device access above, wait before
	356	* accessing the chip again.
200855e5 GR	357	*/
	358	data->access = ktime_get();
	359	zl6100_wait(data);
200855e5 GR	360
	361	info = &data->info;
	362
	363	info->pages = 1;
	364	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT
	365	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	366	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT
56badacb GR	367	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;
56badacb GR	368
1640eaec GR	369	/*
	370	* ZL2004, ZL9101M, and ZL9117M support monitoring an extra voltage
	371	* (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
	372	*/
	373	if (data->id == zl2004 \|\| data->id == zl9101 \|\| data->id == zl9117)
	374	info->func[0] \|= PMBUS_HAVE_VMON \| PMBUS_HAVE_STATUS_VMON;
	375
56badacb GR	376	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
56badacb GR	377	if (ret < 0)
8b313ca7 GR	378	return ret;
8b313ca7 GR	379
56badacb GR	380	if (ret & ZL6100_MFR_XTEMP_ENABLE)
	381	info->func[0] \|= PMBUS_HAVE_TEMP2;
	382
	383	data->access = ktime_get();
	384	zl6100_wait(data);
200855e5 GR	385
	386	info->read_word_data = zl6100_read_word_data;
	387	info->read_byte_data = zl6100_read_byte_data;
	388	info->write_word_data = zl6100_write_word_data;
	389	info->write_byte = zl6100_write_byte;
	390
dd431939	391	return pmbus_do_probe(client, info);
200855e5 GR	392	}
200855e5 GR	393
200855e5 GR	394	static struct i2c_driver zl6100_driver = {
	395	.driver = {
	396	.name = "zl6100",
	397	},
dd431939	398	.probe_new = zl6100_probe,
200855e5 GR	399	.id_table = zl6100_id,
	400	};
	401
f0967eea	402	module_i2c_driver(zl6100_driver);
200855e5 GR	403
	404	MODULE_AUTHOR("Guenter Roeck");
	405	MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
	406	MODULE_LICENSE("GPL");