[deliverable/linux.git] / drivers / hwmon / pmbus / zl6100.c

/*
 * Hardware monitoring driver for ZL6100 and compatibles
 *
 * Copyright (c) 2011 Ericsson AB.
 * Copyright (c) 2012 Guenter Roeck
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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		(1 << 7)

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

#define VMON_UV_WARNING			(1 << 5)
#define VMON_OV_WARNING			(1 << 4)
#define VMON_UV_FAULT			(1 << 1)
#define VMON_OV_FAULT			(1 << 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 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, 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,
			const struct i2c_device_id *id)
{
	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 (id->driver_data != mid->driver_data)
		dev_notice(&client->dev,
			   "Device mismatch: Configured %s, detected %s\n",
			   id->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, mid, info);
}

static struct i2c_driver zl6100_driver = {
	.driver = {
		   .name = "zl6100",
		   },
	.probe = zl6100_probe,
	.remove = pmbus_do_remove,
	.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
200855e5 GR	1	/*
	2	* Hardware monitoring driver for ZL6100 and compatibles
	3	*
	4	* Copyright (c) 2011 Ericsson AB.
1640eaec	5	* Copyright (c) 2012 Guenter Roeck
200855e5 GR	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/err.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/ktime.h>
	29	#include <linux/delay.h>
	30	#include "pmbus.h"
	31
3360a106 GR	32	enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
3360a106 GR	33	zl9101, zl9117 };
200855e5 GR	34
	35	struct zl6100_data {
	36	int id;
	37	ktime_t access; /* chip access time */
7ad6307a	38	int delay; /* Delay between chip accesses in uS */
200855e5 GR	39	struct pmbus_driver_info info;
	40	};
	41
	42	#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
	43
56badacb	44	#define ZL6100_MFR_CONFIG 0xd0
200855e5 GR	45	#define ZL6100_DEVICE_ID 0xe4
200855e5 GR	46
56badacb GR	47	#define ZL6100_MFR_XTEMP_ENABLE (1 << 7)
56badacb GR	48
1640eaec GR	49	#define MFR_VMON_OV_FAULT_LIMIT 0xf5
	50	#define MFR_VMON_UV_FAULT_LIMIT 0xf6
	51	#define MFR_READ_VMON 0xf7
	52
	53	#define VMON_UV_WARNING (1 << 5)
	54	#define VMON_OV_WARNING (1 << 4)
	55	#define VMON_UV_FAULT (1 << 1)
	56	#define VMON_OV_FAULT (1 << 0)
	57
200855e5 GR	58	#define ZL6100_WAIT_TIME 1000 /* uS */
	59
	60	static ushort delay = ZL6100_WAIT_TIME;
	61	module_param(delay, ushort, 0644);
	62	MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
	63
1640eaec GR	64	/* Convert linear sensor value to milli-units */
	65	static long zl6100_l2d(s16 l)
	66	{
	67	s16 exponent;
	68	s32 mantissa;
	69	long val;
	70
	71	exponent = l >> 11;
	72	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
	73
	74	val = mantissa;
	75
	76	/* scale result to milli-units */
	77	val = val * 1000L;
	78
	79	if (exponent >= 0)
	80	val <<= exponent;
	81	else
	82	val >>= -exponent;
	83
	84	return val;
	85	}
	86
	87	#define MAX_MANTISSA (1023 * 1000)
	88	#define MIN_MANTISSA (511 * 1000)
	89
	90	static u16 zl6100_d2l(long val)
	91	{
	92	s16 exponent = 0, mantissa;
	93	bool negative = false;
	94
	95	/* simple case */
	96	if (val == 0)
	97	return 0;
	98
	99	if (val < 0) {
	100	negative = true;
	101	val = -val;
	102	}
	103
	104	/* Reduce large mantissa until it fits into 10 bit */
	105	while (val >= MAX_MANTISSA && exponent < 15) {
	106	exponent++;
	107	val >>= 1;
	108	}
	109	/* Increase small mantissa to improve precision */
	110	while (val < MIN_MANTISSA && exponent > -15) {
	111	exponent--;
	112	val <<= 1;
	113	}
	114
	115	/* Convert mantissa from milli-units to units */
	116	mantissa = DIV_ROUND_CLOSEST(val, 1000);
	117
	118	/* Ensure that resulting number is within range */
	119	if (mantissa > 0x3ff)
	120	mantissa = 0x3ff;
	121
	122	/* restore sign */
	123	if (negative)
	124	mantissa = -mantissa;
	125
	126	/* Convert to 5 bit exponent, 11 bit mantissa */
	127	return (mantissa & 0x7ff) \| ((exponent << 11) & 0xf800);
128	}
129
200855e5 GR	130	/* Some chips need a delay between accesses */
	131	static inline void zl6100_wait(const struct zl6100_data *data)
	132	{
7ad6307a	133	if (data->delay) {
200855e5	134	s64 delta = ktime_us_delta(ktime_get(), data->access);
7ad6307a GR	135	if (delta < data->delay)
7ad6307a GR	136	udelay(data->delay - delta);
200855e5 GR	137	}
	138	}
	139
	140	static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
	141	{
	142	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	143	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	144	int ret, vreg;
200855e5	145
1640eaec	146	if (page > 0)
200855e5 GR	147	return -ENXIO;
200855e5 GR	148
bc581e6f GR	149	if (data->id == zl2005) {
	150	/*
	151	* Limit register detection is not reliable on ZL2005.
	152	* Make sure registers are not erroneously detected.
	153	*/
	154	switch (reg) {
	155	case PMBUS_VOUT_OV_WARN_LIMIT:
	156	case PMBUS_VOUT_UV_WARN_LIMIT:
	157	case PMBUS_IOUT_OC_WARN_LIMIT:
	158	return -ENXIO;
	159	}
	160	}
	161
1640eaec GR	162	switch (reg) {
	163	case PMBUS_VIRT_READ_VMON:
	164	vreg = MFR_READ_VMON;
	165	break;
	166	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	167	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	168	vreg = MFR_VMON_OV_FAULT_LIMIT;
	169	break;
	170	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	171	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	172	vreg = MFR_VMON_UV_FAULT_LIMIT;
	173	break;
	174	default:
	175	if (reg >= PMBUS_VIRT_BASE)
	176	return -ENXIO;
	177	vreg = reg;
	178	break;
	179	}
	180
200855e5	181	zl6100_wait(data);
1640eaec	182	ret = pmbus_read_word_data(client, page, vreg);
200855e5	183	data->access = ktime_get();
1640eaec GR	184	if (ret < 0)
	185	return ret;
	186
	187	switch (reg) {
	188	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	189	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
	190	break;
	191	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	192	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
	193	break;
	194	}
200855e5 GR	195
	196	return ret;
	197	}
	198
	199	static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
	200	{
	201	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	202	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	203	int ret, status;
200855e5 GR	204
	205	if (page > 0)
	206	return -ENXIO;
	207
	208	zl6100_wait(data);
1640eaec GR	209
	210	switch (reg) {
	211	case PMBUS_VIRT_STATUS_VMON:
	212	ret = pmbus_read_byte_data(client, 0,
	213	PMBUS_STATUS_MFR_SPECIFIC);
	214	if (ret < 0)
	215	break;
	216
	217	status = 0;
	218	if (ret & VMON_UV_WARNING)
	219	status \|= PB_VOLTAGE_UV_WARNING;
	220	if (ret & VMON_OV_WARNING)
	221	status \|= PB_VOLTAGE_OV_WARNING;
	222	if (ret & VMON_UV_FAULT)
	223	status \|= PB_VOLTAGE_UV_FAULT;
	224	if (ret & VMON_OV_FAULT)
	225	status \|= PB_VOLTAGE_OV_FAULT;
	226	ret = status;
	227	break;
	228	default:
	229	ret = pmbus_read_byte_data(client, page, reg);
	230	break;
	231	}
200855e5 GR	232	data->access = ktime_get();
	233
	234	return ret;
	235	}
	236
	237	static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
	238	u16 word)
	239	{
	240	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	241	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	242	int ret, vreg;
200855e5	243
1640eaec	244	if (page > 0)
200855e5 GR	245	return -ENXIO;
200855e5 GR	246
1640eaec GR	247	switch (reg) {
	248	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	249	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
	250	vreg = MFR_VMON_OV_FAULT_LIMIT;
	251	pmbus_clear_cache(client);
	252	break;
	253	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	254	vreg = MFR_VMON_OV_FAULT_LIMIT;
	255	pmbus_clear_cache(client);
	256	break;
	257	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	258	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
	259	vreg = MFR_VMON_UV_FAULT_LIMIT;
	260	pmbus_clear_cache(client);
	261	break;
	262	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	263	vreg = MFR_VMON_UV_FAULT_LIMIT;
	264	pmbus_clear_cache(client);
	265	break;
	266	default:
	267	if (reg >= PMBUS_VIRT_BASE)
	268	return -ENXIO;
	269	vreg = reg;
	270	}
	271
200855e5	272	zl6100_wait(data);
1640eaec	273	ret = pmbus_write_word_data(client, page, vreg, word);
200855e5 GR	274	data->access = ktime_get();
	275
	276	return ret;
	277	}
	278
	279	static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
	280	{
	281	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	282	struct zl6100_data *data = to_zl6100_data(info);
	283	int ret;
	284
	285	if (page > 0)
	286	return -ENXIO;
	287
	288	zl6100_wait(data);
	289	ret = pmbus_write_byte(client, page, value);
	290	data->access = ktime_get();
	291
	292	return ret;
	293	}
	294
	295	static const struct i2c_device_id zl6100_id[] = {
443830f6 GR	296	{"bmr450", zl2005},
	297	{"bmr451", zl2005},
	298	{"bmr462", zl2008},
	299	{"bmr463", zl2008},
	300	{"bmr464", zl2008},
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},
3360a106 GR	309	{"zl9101", zl9101},
3360a106 GR	310	{"zl9117", zl9117},
200855e5 GR	311	{ }
	312	};
	313	MODULE_DEVICE_TABLE(i2c, zl6100_id);
	314
	315	static int zl6100_probe(struct i2c_client *client,
	316	const struct i2c_device_id *id)
	317	{
	318	int ret;
	319	struct zl6100_data *data;
	320	struct pmbus_driver_info *info;
	321	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	322	const struct i2c_device_id *mid;
	323
	324	if (!i2c_check_functionality(client->adapter,
56badacb	325	I2C_FUNC_SMBUS_READ_WORD_DATA
200855e5 GR	326	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	327	return -ENODEV;
	328
	329	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
	330	device_id);
	331	if (ret < 0) {
	332	dev_err(&client->dev, "Failed to read device ID\n");
	333	return ret;
	334	}
	335	device_id[ret] = '\0';
	336	dev_info(&client->dev, "Device ID %s\n", device_id);
	337
	338	mid = NULL;
	339	for (mid = zl6100_id; mid->name[0]; mid++) {
	340	if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
	341	break;
	342	}
	343	if (!mid->name[0]) {
	344	dev_err(&client->dev, "Unsupported device\n");
	345	return -ENODEV;
	346	}
	347	if (id->driver_data != mid->driver_data)
	348	dev_notice(&client->dev,
	349	"Device mismatch: Configured %s, detected %s\n",
	350	id->name, mid->name);
	351
8b313ca7 GR	352	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
8b313ca7 GR	353	GFP_KERNEL);
200855e5 GR	354	if (!data)
	355	return -ENOMEM;
	356
	357	data->id = mid->driver_data;
	358
	359	/*
fecfb644 GR	360	* According to information from the chip vendor, all currently
	361	* supported chips are known to require a wait time between I2C
	362	* accesses.
200855e5	363	*/
7ad6307a	364	data->delay = delay;
200855e5 GR	365
	366	/*
	367	* Since there was a direct I2C device access above, wait before
	368	* accessing the chip again.
200855e5 GR	369	*/
	370	data->access = ktime_get();
	371	zl6100_wait(data);
200855e5 GR	372
	373	info = &data->info;
	374
	375	info->pages = 1;
	376	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT
	377	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	378	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT
56badacb GR	379	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;
56badacb GR	380
1640eaec GR	381	/*
	382	* ZL2004, ZL9101M, and ZL9117M support monitoring an extra voltage
	383	* (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
	384	*/
	385	if (data->id == zl2004 \|\| data->id == zl9101 \|\| data->id == zl9117)
	386	info->func[0] \|= PMBUS_HAVE_VMON \| PMBUS_HAVE_STATUS_VMON;
	387
56badacb GR	388	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
56badacb GR	389	if (ret < 0)
8b313ca7 GR	390	return ret;
8b313ca7 GR	391
56badacb GR	392	if (ret & ZL6100_MFR_XTEMP_ENABLE)
	393	info->func[0] \|= PMBUS_HAVE_TEMP2;
	394
	395	data->access = ktime_get();
	396	zl6100_wait(data);
200855e5 GR	397
	398	info->read_word_data = zl6100_read_word_data;
	399	info->read_byte_data = zl6100_read_byte_data;
	400	info->write_word_data = zl6100_write_word_data;
	401	info->write_byte = zl6100_write_byte;
	402
8b313ca7	403	return pmbus_do_probe(client, mid, info);
200855e5 GR	404	}
200855e5 GR	405
200855e5 GR	406	static struct i2c_driver zl6100_driver = {
	407	.driver = {
	408	.name = "zl6100",
	409	},
	410	.probe = zl6100_probe,
dd285ad7	411	.remove = pmbus_do_remove,
200855e5 GR	412	.id_table = zl6100_id,
	413	};
	414
f0967eea	415	module_i2c_driver(zl6100_driver);
200855e5 GR	416
	417	MODULE_AUTHOR("Guenter Roeck");
	418	MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
	419	MODULE_LICENSE("GPL");