[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/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 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
2c052d42	22	#include <linux/bitops.h>
200855e5 GR	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/init.h>
	26	#include <linux/err.h>
	27	#include <linux/slab.h>
	28	#include <linux/i2c.h>
	29	#include <linux/ktime.h>
	30	#include <linux/delay.h>
	31	#include "pmbus.h"
	32
3360a106 GR	33	enum chips { zl2004, zl2005, zl2006, zl2008, zl2105, zl2106, zl6100, zl6105,
3360a106 GR	34	zl9101, zl9117 };
200855e5 GR	35
	36	struct zl6100_data {
	37	int id;
	38	ktime_t access; /* chip access time */
7ad6307a	39	int delay; /* Delay between chip accesses in uS */
200855e5 GR	40	struct pmbus_driver_info info;
	41	};
	42
	43	#define to_zl6100_data(x) container_of(x, struct zl6100_data, info)
	44
56badacb	45	#define ZL6100_MFR_CONFIG 0xd0
200855e5 GR	46	#define ZL6100_DEVICE_ID 0xe4
200855e5 GR	47
2c052d42	48	#define ZL6100_MFR_XTEMP_ENABLE BIT(7)
56badacb	49
1640eaec GR	50	#define MFR_VMON_OV_FAULT_LIMIT 0xf5
	51	#define MFR_VMON_UV_FAULT_LIMIT 0xf6
	52	#define MFR_READ_VMON 0xf7
	53
2c052d42 GR	54	#define VMON_UV_WARNING BIT(5)
	55	#define VMON_OV_WARNING BIT(4)
	56	#define VMON_UV_FAULT BIT(1)
	57	#define VMON_OV_FAULT BIT(0)
1640eaec	58
200855e5 GR	59	#define ZL6100_WAIT_TIME 1000 /* uS */
	60
	61	static ushort delay = ZL6100_WAIT_TIME;
	62	module_param(delay, ushort, 0644);
	63	MODULE_PARM_DESC(delay, "Delay between chip accesses in uS");
	64
1640eaec GR	65	/* Convert linear sensor value to milli-units */
	66	static long zl6100_l2d(s16 l)
	67	{
	68	s16 exponent;
	69	s32 mantissa;
	70	long val;
	71
	72	exponent = l >> 11;
	73	mantissa = ((s16)((l & 0x7ff) << 5)) >> 5;
	74
	75	val = mantissa;
	76
	77	/* scale result to milli-units */
	78	val = val * 1000L;
	79
	80	if (exponent >= 0)
	81	val <<= exponent;
	82	else
	83	val >>= -exponent;
	84
	85	return val;
	86	}
	87
	88	#define MAX_MANTISSA (1023 * 1000)
	89	#define MIN_MANTISSA (511 * 1000)
	90
	91	static u16 zl6100_d2l(long val)
	92	{
	93	s16 exponent = 0, mantissa;
	94	bool negative = false;
	95
	96	/* simple case */
	97	if (val == 0)
	98	return 0;
	99
	100	if (val < 0) {
	101	negative = true;
	102	val = -val;
	103	}
	104
	105	/* Reduce large mantissa until it fits into 10 bit */
	106	while (val >= MAX_MANTISSA && exponent < 15) {
	107	exponent++;
	108	val >>= 1;
	109	}
	110	/* Increase small mantissa to improve precision */
	111	while (val < MIN_MANTISSA && exponent > -15) {
	112	exponent--;
	113	val <<= 1;
	114	}
	115
	116	/* Convert mantissa from milli-units to units */
	117	mantissa = DIV_ROUND_CLOSEST(val, 1000);
	118
	119	/* Ensure that resulting number is within range */
	120	if (mantissa > 0x3ff)
	121	mantissa = 0x3ff;
	122
	123	/* restore sign */
	124	if (negative)
	125	mantissa = -mantissa;
	126
	127	/* Convert to 5 bit exponent, 11 bit mantissa */
	128	return (mantissa & 0x7ff) \| ((exponent << 11) & 0xf800);
129	}
130
200855e5 GR	131	/* Some chips need a delay between accesses */
	132	static inline void zl6100_wait(const struct zl6100_data *data)
	133	{
7ad6307a	134	if (data->delay) {
200855e5	135	s64 delta = ktime_us_delta(ktime_get(), data->access);
7ad6307a GR	136	if (delta < data->delay)
7ad6307a GR	137	udelay(data->delay - delta);
200855e5 GR	138	}
	139	}
	140
	141	static int zl6100_read_word_data(struct i2c_client *client, int page, int reg)
	142	{
	143	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	144	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	145	int ret, vreg;
200855e5	146
1640eaec	147	if (page > 0)
200855e5 GR	148	return -ENXIO;
200855e5 GR	149
bc581e6f GR	150	if (data->id == zl2005) {
	151	/*
	152	* Limit register detection is not reliable on ZL2005.
	153	* Make sure registers are not erroneously detected.
	154	*/
	155	switch (reg) {
	156	case PMBUS_VOUT_OV_WARN_LIMIT:
	157	case PMBUS_VOUT_UV_WARN_LIMIT:
	158	case PMBUS_IOUT_OC_WARN_LIMIT:
	159	return -ENXIO;
	160	}
	161	}
	162
1640eaec GR	163	switch (reg) {
	164	case PMBUS_VIRT_READ_VMON:
	165	vreg = MFR_READ_VMON;
	166	break;
	167	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	168	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	169	vreg = MFR_VMON_OV_FAULT_LIMIT;
	170	break;
	171	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	172	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	173	vreg = MFR_VMON_UV_FAULT_LIMIT;
	174	break;
	175	default:
	176	if (reg >= PMBUS_VIRT_BASE)
	177	return -ENXIO;
	178	vreg = reg;
	179	break;
	180	}
	181
200855e5	182	zl6100_wait(data);
1640eaec	183	ret = pmbus_read_word_data(client, page, vreg);
200855e5	184	data->access = ktime_get();
1640eaec GR	185	if (ret < 0)
	186	return ret;
	187
	188	switch (reg) {
	189	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	190	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 9, 10));
	191	break;
	192	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	193	ret = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(ret) * 11, 10));
	194	break;
	195	}
200855e5 GR	196
	197	return ret;
	198	}
	199
	200	static int zl6100_read_byte_data(struct i2c_client *client, int page, int reg)
	201	{
	202	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	203	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	204	int ret, status;
200855e5 GR	205
	206	if (page > 0)
	207	return -ENXIO;
	208
	209	zl6100_wait(data);
1640eaec GR	210
	211	switch (reg) {
	212	case PMBUS_VIRT_STATUS_VMON:
	213	ret = pmbus_read_byte_data(client, 0,
	214	PMBUS_STATUS_MFR_SPECIFIC);
	215	if (ret < 0)
	216	break;
	217
	218	status = 0;
	219	if (ret & VMON_UV_WARNING)
	220	status \|= PB_VOLTAGE_UV_WARNING;
	221	if (ret & VMON_OV_WARNING)
	222	status \|= PB_VOLTAGE_OV_WARNING;
	223	if (ret & VMON_UV_FAULT)
	224	status \|= PB_VOLTAGE_UV_FAULT;
	225	if (ret & VMON_OV_FAULT)
	226	status \|= PB_VOLTAGE_OV_FAULT;
	227	ret = status;
	228	break;
	229	default:
	230	ret = pmbus_read_byte_data(client, page, reg);
	231	break;
	232	}
200855e5 GR	233	data->access = ktime_get();
	234
	235	return ret;
	236	}
	237
	238	static int zl6100_write_word_data(struct i2c_client *client, int page, int reg,
	239	u16 word)
	240	{
	241	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	242	struct zl6100_data *data = to_zl6100_data(info);
1640eaec	243	int ret, vreg;
200855e5	244
1640eaec	245	if (page > 0)
200855e5 GR	246	return -ENXIO;
200855e5 GR	247
1640eaec GR	248	switch (reg) {
	249	case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
	250	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 9));
	251	vreg = MFR_VMON_OV_FAULT_LIMIT;
	252	pmbus_clear_cache(client);
	253	break;
	254	case PMBUS_VIRT_VMON_OV_FAULT_LIMIT:
	255	vreg = MFR_VMON_OV_FAULT_LIMIT;
	256	pmbus_clear_cache(client);
	257	break;
	258	case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
	259	word = zl6100_d2l(DIV_ROUND_CLOSEST(zl6100_l2d(word) * 10, 11));
	260	vreg = MFR_VMON_UV_FAULT_LIMIT;
	261	pmbus_clear_cache(client);
	262	break;
	263	case PMBUS_VIRT_VMON_UV_FAULT_LIMIT:
	264	vreg = MFR_VMON_UV_FAULT_LIMIT;
	265	pmbus_clear_cache(client);
	266	break;
	267	default:
	268	if (reg >= PMBUS_VIRT_BASE)
	269	return -ENXIO;
	270	vreg = reg;
	271	}
	272
200855e5	273	zl6100_wait(data);
1640eaec	274	ret = pmbus_write_word_data(client, page, vreg, word);
200855e5 GR	275	data->access = ktime_get();
	276
	277	return ret;
	278	}
	279
	280	static int zl6100_write_byte(struct i2c_client *client, int page, u8 value)
	281	{
	282	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
	283	struct zl6100_data *data = to_zl6100_data(info);
	284	int ret;
	285
	286	if (page > 0)
	287	return -ENXIO;
	288
	289	zl6100_wait(data);
	290	ret = pmbus_write_byte(client, page, value);
	291	data->access = ktime_get();
	292
	293	return ret;
	294	}
	295
	296	static const struct i2c_device_id zl6100_id[] = {
443830f6 GR	297	{"bmr450", zl2005},
	298	{"bmr451", zl2005},
	299	{"bmr462", zl2008},
	300	{"bmr463", zl2008},
	301	{"bmr464", zl2008},
200855e5	302	{"zl2004", zl2004},
bc581e6f	303	{"zl2005", zl2005},
200855e5 GR	304	{"zl2006", zl2006},
	305	{"zl2008", zl2008},
	306	{"zl2105", zl2105},
	307	{"zl2106", zl2106},
	308	{"zl6100", zl6100},
	309	{"zl6105", zl6105},
3360a106 GR	310	{"zl9101", zl9101},
3360a106 GR	311	{"zl9117", zl9117},
200855e5 GR	312	{ }
	313	};
	314	MODULE_DEVICE_TABLE(i2c, zl6100_id);
	315
	316	static int zl6100_probe(struct i2c_client *client,
	317	const struct i2c_device_id *id)
	318	{
	319	int ret;
	320	struct zl6100_data *data;
	321	struct pmbus_driver_info *info;
	322	u8 device_id[I2C_SMBUS_BLOCK_MAX + 1];
	323	const struct i2c_device_id *mid;
	324
	325	if (!i2c_check_functionality(client->adapter,
56badacb	326	I2C_FUNC_SMBUS_READ_WORD_DATA
200855e5 GR	327	\| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
	328	return -ENODEV;
	329
	330	ret = i2c_smbus_read_block_data(client, ZL6100_DEVICE_ID,
	331	device_id);
	332	if (ret < 0) {
	333	dev_err(&client->dev, "Failed to read device ID\n");
	334	return ret;
	335	}
	336	device_id[ret] = '\0';
	337	dev_info(&client->dev, "Device ID %s\n", device_id);
	338
	339	mid = NULL;
	340	for (mid = zl6100_id; mid->name[0]; mid++) {
	341	if (!strncasecmp(mid->name, device_id, strlen(mid->name)))
	342	break;
	343	}
	344	if (!mid->name[0]) {
	345	dev_err(&client->dev, "Unsupported device\n");
	346	return -ENODEV;
	347	}
	348	if (id->driver_data != mid->driver_data)
	349	dev_notice(&client->dev,
	350	"Device mismatch: Configured %s, detected %s\n",
	351	id->name, mid->name);
	352
8b313ca7 GR	353	data = devm_kzalloc(&client->dev, sizeof(struct zl6100_data),
8b313ca7 GR	354	GFP_KERNEL);
200855e5 GR	355	if (!data)
	356	return -ENOMEM;
	357
	358	data->id = mid->driver_data;
	359
	360	/*
fecfb644 GR	361	* According to information from the chip vendor, all currently
	362	* supported chips are known to require a wait time between I2C
	363	* accesses.
200855e5	364	*/
7ad6307a	365	data->delay = delay;
200855e5 GR	366
	367	/*
	368	* Since there was a direct I2C device access above, wait before
	369	* accessing the chip again.
200855e5 GR	370	*/
	371	data->access = ktime_get();
	372	zl6100_wait(data);
200855e5 GR	373
	374	info = &data->info;
	375
	376	info->pages = 1;
	377	info->func[0] = PMBUS_HAVE_VIN \| PMBUS_HAVE_STATUS_INPUT
	378	\| PMBUS_HAVE_VOUT \| PMBUS_HAVE_STATUS_VOUT
	379	\| PMBUS_HAVE_IOUT \| PMBUS_HAVE_STATUS_IOUT
56badacb GR	380	\| PMBUS_HAVE_TEMP \| PMBUS_HAVE_STATUS_TEMP;
56badacb GR	381
1640eaec GR	382	/*
	383	* ZL2004, ZL9101M, and ZL9117M support monitoring an extra voltage
	384	* (VMON for ZL2004, VDRV for ZL9101M and ZL9117M). Report it as vmon.
	385	*/
	386	if (data->id == zl2004 \|\| data->id == zl9101 \|\| data->id == zl9117)
	387	info->func[0] \|= PMBUS_HAVE_VMON \| PMBUS_HAVE_STATUS_VMON;
	388
56badacb GR	389	ret = i2c_smbus_read_word_data(client, ZL6100_MFR_CONFIG);
56badacb GR	390	if (ret < 0)
8b313ca7 GR	391	return ret;
8b313ca7 GR	392
56badacb GR	393	if (ret & ZL6100_MFR_XTEMP_ENABLE)
	394	info->func[0] \|= PMBUS_HAVE_TEMP2;
	395
	396	data->access = ktime_get();
	397	zl6100_wait(data);
200855e5 GR	398
	399	info->read_word_data = zl6100_read_word_data;
	400	info->read_byte_data = zl6100_read_byte_data;
	401	info->write_word_data = zl6100_write_word_data;
	402	info->write_byte = zl6100_write_byte;
	403
8b313ca7	404	return pmbus_do_probe(client, mid, info);
200855e5 GR	405	}
200855e5 GR	406
200855e5 GR	407	static struct i2c_driver zl6100_driver = {
	408	.driver = {
	409	.name = "zl6100",
	410	},
	411	.probe = zl6100_probe,
dd285ad7	412	.remove = pmbus_do_remove,
200855e5 GR	413	.id_table = zl6100_id,
	414	};
	415
f0967eea	416	module_i2c_driver(zl6100_driver);
200855e5 GR	417
	418	MODULE_AUTHOR("Guenter Roeck");
	419	MODULE_DESCRIPTION("PMBus driver for ZL6100 and compatibles");
	420	MODULE_LICENSE("GPL");