[linux-block.git] / drivers / hwmon / pmbus / ucd9000.c

/*
 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
 * Controller series
 *
 * Copyright (C) 2011 Ericsson AB.
 *
 * 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/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pmbus.h>
#include <linux/gpio.h>
#include <linux/gpio/driver.h>
#include "pmbus.h"

enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };

#define UCD9000_MONITOR_CONFIG		0xd5
#define UCD9000_NUM_PAGES		0xd6
#define UCD9000_FAN_CONFIG_INDEX	0xe7
#define UCD9000_FAN_CONFIG		0xe8
#define UCD9000_MFR_STATUS		0xf3
#define UCD9000_GPIO_SELECT		0xfa
#define UCD9000_GPIO_CONFIG		0xfb
#define UCD9000_DEVICE_ID		0xfd

/* GPIO CONFIG bits */
#define UCD9000_GPIO_CONFIG_ENABLE	BIT(0)
#define UCD9000_GPIO_CONFIG_OUT_ENABLE	BIT(1)
#define UCD9000_GPIO_CONFIG_OUT_VALUE	BIT(2)
#define UCD9000_GPIO_CONFIG_STATUS	BIT(3)
#define UCD9000_GPIO_INPUT		0
#define UCD9000_GPIO_OUTPUT		1

#define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
#define UCD9000_MON_PAGE(x)	((x) & 0x0f)

#define UCD9000_MON_VOLTAGE	1
#define UCD9000_MON_TEMPERATURE	2
#define UCD9000_MON_CURRENT	3
#define UCD9000_MON_VOLTAGE_HW	4

#define UCD9000_NUM_FAN		4

#define UCD9000_GPIO_NAME_LEN	16
#define UCD9090_NUM_GPIOS	23
#define UCD901XX_NUM_GPIOS	26
#define UCD90910_NUM_GPIOS	26

#define UCD9000_DEBUGFS_NAME_LEN	24
#define UCD9000_GPI_COUNT		8

struct ucd9000_data {
	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	struct pmbus_driver_info info;
#ifdef CONFIG_GPIOLIB
	struct gpio_chip gpio;
#endif
	struct dentry *debugfs;
};
#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)

struct ucd9000_debugfs_entry {
	struct i2c_client *client;
	u8 index;
};

static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
{
	int fan_config = 0;
	struct ucd9000_data *data
	  = to_ucd9000_data(pmbus_get_driver_info(client));

	if (data->fan_data[fan][3] & 1)
		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */

	/* Pulses/revolution */
	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;

	return fan_config;
}

static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
{
	int ret = 0;
	int fan_config;

	switch (reg) {
	case PMBUS_FAN_CONFIG_12:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 0);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 1);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	case PMBUS_FAN_CONFIG_34:
		if (page > 0)
			return -ENXIO;

		ret = ucd9000_get_fan_config(client, 2);
		if (ret < 0)
			return ret;
		fan_config = ret << 4;
		ret = ucd9000_get_fan_config(client, 3);
		if (ret < 0)
			return ret;
		fan_config |= ret;
		ret = fan_config;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static const struct i2c_device_id ucd9000_id[] = {
	{"ucd9000", ucd9000},
	{"ucd90120", ucd90120},
	{"ucd90124", ucd90124},
	{"ucd90160", ucd90160},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);

static const struct of_device_id ucd9000_of_match[] = {
	{
		.compatible = "ti,ucd9000",
		.data = (void *)ucd9000
	},
	{
		.compatible = "ti,ucd90120",
		.data = (void *)ucd90120
	},
	{
		.compatible = "ti,ucd90124",
		.data = (void *)ucd90124
	},
	{
		.compatible = "ti,ucd90160",
		.data = (void *)ucd90160
	},
	{
		.compatible = "ti,ucd9090",
		.data = (void *)ucd9090
	},
	{
		.compatible = "ti,ucd90910",
		.data = (void *)ucd90910
	},
	{ },
};
MODULE_DEVICE_TABLE(of, ucd9000_of_match);

#ifdef CONFIG_GPIOLIB
static int ucd9000_gpio_read_config(struct i2c_client *client,
				    unsigned int offset)
{
	int ret;

	/* No page set required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
	if (ret < 0)
		return ret;

	return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
}

static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
	struct i2c_client *client  = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
}

static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
			     int value)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0) {
		dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
			offset, ret);
		return;
	}

	if (value) {
		if (ret & UCD9000_GPIO_CONFIG_STATUS)
			return;

		ret |= UCD9000_GPIO_CONFIG_STATUS;
	} else {
		if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
			return;

		ret &= ~UCD9000_GPIO_CONFIG_STATUS;
	}

	ret |= UCD9000_GPIO_CONFIG_ENABLE;

	/* Page set not required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	if (ret < 0) {
		dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
			offset, ret);
		return;
	}

	ret &= ~UCD9000_GPIO_CONFIG_ENABLE;

	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	if (ret < 0)
		dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
			offset, ret);
}

static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
				      unsigned int offset)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
}

static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
				      unsigned int offset, bool direction_out,
				      int requested_out)
{
	struct i2c_client *client = gpiochip_get_data(gc);
	int ret, config, out_val;

	ret = ucd9000_gpio_read_config(client, offset);
	if (ret < 0)
		return ret;

	if (direction_out) {
		out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;

		if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
			if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
				return 0;
		} else {
			ret |= UCD9000_GPIO_CONFIG_OUT_ENABLE;
		}

		if (out_val)
			ret |= UCD9000_GPIO_CONFIG_OUT_VALUE;
		else
			ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;

	} else {
		if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
			return 0;

		ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
	}

	ret |= UCD9000_GPIO_CONFIG_ENABLE;
	config = ret;

	/* Page set not required */
	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
	if (ret < 0)
		return ret;

	config &= ~UCD9000_GPIO_CONFIG_ENABLE;

	return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
}

static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
					unsigned int offset)
{
	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
}

static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
					 unsigned int offset, int val)
{
	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
					  val);
}

static void ucd9000_probe_gpio(struct i2c_client *client,
			       const struct i2c_device_id *mid,
			       struct ucd9000_data *data)
{
	int rc;

	switch (mid->driver_data) {
	case ucd9090:
		data->gpio.ngpio = UCD9090_NUM_GPIOS;
		break;
	case ucd90120:
	case ucd90124:
	case ucd90160:
		data->gpio.ngpio = UCD901XX_NUM_GPIOS;
		break;
	case ucd90910:
		data->gpio.ngpio = UCD90910_NUM_GPIOS;
		break;
	default:
		return; /* GPIO support is optional. */
	}

	/*
	 * Pinmux support has not been added to the new gpio_chip.
	 * This support should be added when possible given the mux
	 * behavior of these IO devices.
	 */
	data->gpio.label = client->name;
	data->gpio.get_direction = ucd9000_gpio_get_direction;
	data->gpio.direction_input = ucd9000_gpio_direction_input;
	data->gpio.direction_output = ucd9000_gpio_direction_output;
	data->gpio.get = ucd9000_gpio_get;
	data->gpio.set = ucd9000_gpio_set;
	data->gpio.can_sleep = true;
	data->gpio.base = -1;
	data->gpio.parent = &client->dev;

	rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
	if (rc)
		dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
}
#else
static void ucd9000_probe_gpio(struct i2c_client *client,
			       const struct i2c_device_id *mid,
			       struct ucd9000_data *data)
{
}
#endif /* CONFIG_GPIOLIB */

#ifdef CONFIG_DEBUG_FS
static int ucd9000_get_mfr_status(struct i2c_client *client, u8 *buffer)
{
	int ret = pmbus_set_page(client, 0);

	if (ret < 0)
		return ret;

	return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
}

static int ucd9000_debugfs_show_mfr_status_bit(void *data, u64 *val)
{
	struct ucd9000_debugfs_entry *entry = data;
	struct i2c_client *client = entry->client;
	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	int ret;

	ret = ucd9000_get_mfr_status(client, buffer);
	if (ret < 0)
		return ret;

	/*
	 * Attribute only created for devices with gpi fault bits at bits
	 * 16-23, which is the second byte of the response.
	 */
	*val = !!(buffer[1] & BIT(entry->index));

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
			 ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");

static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
					       char __user *buf, size_t count,
					       loff_t *ppos)
{
	struct i2c_client *client = file->private_data;
	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
	char *res;
	int rc;

	rc = ucd9000_get_mfr_status(client, buffer);
	if (rc < 0)
		return rc;

	res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
	*res++ = '\n';
	*res = 0;

	return simple_read_from_buffer(buf, count, ppos, str, res - str);
}

static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
	.llseek = noop_llseek,
	.read = ucd9000_debugfs_read_mfr_status,
	.open = simple_open,
};

static int ucd9000_init_debugfs(struct i2c_client *client,
				const struct i2c_device_id *mid,
				struct ucd9000_data *data)
{
	struct dentry *debugfs;
	struct ucd9000_debugfs_entry *entries;
	int i;
	char name[UCD9000_DEBUGFS_NAME_LEN];

	debugfs = pmbus_get_debugfs_dir(client);
	if (!debugfs)
		return -ENOENT;

	data->debugfs = debugfs_create_dir(client->name, debugfs);
	if (!data->debugfs)
		return -ENOENT;

	/*
	 * Of the chips this driver supports, only the UCD9090, UCD90160,
	 * and UCD90910 report GPI faults in their MFR_STATUS register, so only
	 * create the GPI fault debugfs attributes for those chips.
	 */
	if (mid->driver_data == ucd9090 || mid->driver_data == ucd90160 ||
	    mid->driver_data == ucd90910) {
		entries = devm_kcalloc(&client->dev,
				       UCD9000_GPI_COUNT, sizeof(*entries),
				       GFP_KERNEL);
		if (!entries)
			return -ENOMEM;

		for (i = 0; i < UCD9000_GPI_COUNT; i++) {
			entries[i].client = client;
			entries[i].index = i;
			scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
				  "gpi%d_alarm", i + 1);
			debugfs_create_file(name, 0444, data->debugfs,
					    &entries[i],
					    &ucd9000_debugfs_mfr_status_bit);
		}
	}

	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
	debugfs_create_file(name, 0444, data->debugfs, client,
			    &ucd9000_debugfs_show_mfr_status_fops);

	return 0;
}
#else
static int ucd9000_init_debugfs(struct i2c_client *client,
				const struct i2c_device_id *mid,
				struct ucd9000_data *data)
{
	return 0;
}
#endif /* CONFIG_DEBUG_FS */

static int ucd9000_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	struct ucd9000_data *data;
	struct pmbus_driver_info *info;
	const struct i2c_device_id *mid;
	enum chips chip;
	int i, ret;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA |
				     I2C_FUNC_SMBUS_BLOCK_DATA))
		return -ENODEV;

	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
					block_buffer);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to read device ID\n");
		return ret;
	}
	block_buffer[ret] = '\0';
	dev_info(&client->dev, "Device ID %s\n", block_buffer);

	for (mid = ucd9000_id; mid->name[0]; mid++) {
		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
			break;
	}
	if (!mid->name[0]) {
		dev_err(&client->dev, "Unsupported device\n");
		return -ENODEV;
	}

	if (client->dev.of_node)
		chip = (enum chips)of_device_get_match_data(&client->dev);
	else
		chip = id->driver_data;

	if (chip != ucd9000 && chip != 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 ucd9000_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	info = &data->info;

	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	if (ret < 0) {
		dev_err(&client->dev,
			"Failed to read number of active pages\n");
		return ret;
	}
	info->pages = ret;
	if (!info->pages) {
		dev_err(&client->dev, "No pages configured\n");
		return -ENODEV;
	}

	/* The internal temperature sensor is always active */
	info->func[0] = PMBUS_HAVE_TEMP;

	/* Everything else is configurable */
	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
					block_buffer);
	if (ret <= 0) {
		dev_err(&client->dev, "Failed to read configuration data\n");
		return -ENODEV;
	}
	for (i = 0; i < ret; i++) {
		int page = UCD9000_MON_PAGE(block_buffer[i]);

		if (page >= info->pages)
			continue;

		switch (UCD9000_MON_TYPE(block_buffer[i])) {
		case UCD9000_MON_VOLTAGE:
		case UCD9000_MON_VOLTAGE_HW:
			info->func[page] |= PMBUS_HAVE_VOUT
			  | PMBUS_HAVE_STATUS_VOUT;
			break;
		case UCD9000_MON_TEMPERATURE:
			info->func[page] |= PMBUS_HAVE_TEMP2
			  | PMBUS_HAVE_STATUS_TEMP;
			break;
		case UCD9000_MON_CURRENT:
			info->func[page] |= PMBUS_HAVE_IOUT
			  | PMBUS_HAVE_STATUS_IOUT;
			break;
		default:
			break;
		}
	}

	/* Fan configuration */
	if (mid->driver_data == ucd90124) {
		for (i = 0; i < UCD9000_NUM_FAN; i++) {
			i2c_smbus_write_byte_data(client,
						  UCD9000_FAN_CONFIG_INDEX, i);
			ret = i2c_smbus_read_block_data(client,
							UCD9000_FAN_CONFIG,
							data->fan_data[i]);
			if (ret < 0)
				return ret;
		}
		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);

		info->read_byte_data = ucd9000_read_byte_data;
		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
	}

	ucd9000_probe_gpio(client, mid, data);

	ret = pmbus_do_probe(client, mid, info);
	if (ret)
		return ret;

	ret = ucd9000_init_debugfs(client, mid, data);
	if (ret)
		dev_warn(&client->dev, "Failed to register debugfs: %d\n",
			 ret);

	return 0;
}

/* This is the driver that will be inserted */
static struct i2c_driver ucd9000_driver = {
	.driver = {
		.name = "ucd9000",
		.of_match_table = of_match_ptr(ucd9000_of_match),
	},
	.probe = ucd9000_probe,
	.remove = pmbus_do_remove,
	.id_table = ucd9000_id,
};

module_i2c_driver(ucd9000_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
Commit	Line	Data
0c0a0615 GR	1	/*
	2	* Hardware monitoring driver for UCD90xxx Sequencer and System Health
	3	* Controller series
	4	*
	5	* Copyright (C) 2011 Ericsson AB.
	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
72816cb0	22	#include <linux/debugfs.h>
0c0a0615 GR	23	#include <linux/kernel.h>
0c0a0615 GR	24	#include <linux/module.h>
8881a191	25	#include <linux/of_device.h>
0c0a0615 GR	26	#include <linux/init.h>
	27	#include <linux/err.h>
	28	#include <linux/slab.h>
	29	#include <linux/i2c.h>
4ba1bb12	30	#include <linux/pmbus.h>
ca781fb7 CB	31	#include <linux/gpio.h>
ca781fb7 CB	32	#include <linux/gpio/driver.h>
0c0a0615 GR	33	#include "pmbus.h"
0c0a0615 GR	34
50b2b02c	35	enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd9090, ucd90910 };
0c0a0615 GR	36
	37	#define UCD9000_MONITOR_CONFIG 0xd5
	38	#define UCD9000_NUM_PAGES 0xd6
	39	#define UCD9000_FAN_CONFIG_INDEX 0xe7
	40	#define UCD9000_FAN_CONFIG 0xe8
72816cb0	41	#define UCD9000_MFR_STATUS 0xf3
ca781fb7 CB	42	#define UCD9000_GPIO_SELECT 0xfa
ca781fb7 CB	43	#define UCD9000_GPIO_CONFIG 0xfb
0c0a0615 GR	44	#define UCD9000_DEVICE_ID 0xfd
0c0a0615 GR	45
ca781fb7 CB	46	/* GPIO CONFIG bits */
	47	#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
	48	#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
	49	#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
	50	#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
	51	#define UCD9000_GPIO_INPUT 0
	52	#define UCD9000_GPIO_OUTPUT 1
	53
0c0a0615 GR	54	#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
	55	#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
	56
	57	#define UCD9000_MON_VOLTAGE 1
	58	#define UCD9000_MON_TEMPERATURE 2
	59	#define UCD9000_MON_CURRENT 3
	60	#define UCD9000_MON_VOLTAGE_HW 4
	61
	62	#define UCD9000_NUM_FAN 4
	63
ca781fb7 CB	64	#define UCD9000_GPIO_NAME_LEN 16
	65	#define UCD9090_NUM_GPIOS 23
	66	#define UCD901XX_NUM_GPIOS 26
	67	#define UCD90910_NUM_GPIOS 26
	68
72816cb0 CB	69	#define UCD9000_DEBUGFS_NAME_LEN 24
	70	#define UCD9000_GPI_COUNT 8
	71
0c0a0615 GR	72	struct ucd9000_data {
	73	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	74	struct pmbus_driver_info info;
ca781fb7 CB	75	#ifdef CONFIG_GPIOLIB
	76	struct gpio_chip gpio;
	77	#endif
72816cb0	78	struct dentry *debugfs;
0c0a0615 GR	79	};
	80	#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
	81
72816cb0 CB	82	struct ucd9000_debugfs_entry {
	83	struct i2c_client *client;
	84	u8 index;
	85	};
	86
0c0a0615 GR	87	static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	88	{
	89	int fan_config = 0;
	90	struct ucd9000_data *data
	91	= to_ucd9000_data(pmbus_get_driver_info(client));
	92
	93	if (data->fan_data[fan][3] & 1)
	94	fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */
	95
	96	/* Pulses/revolution */
	97	fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;
	98
	99	return fan_config;
	100	}
	101
	102	static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
	103	{
	104	int ret = 0;
	105	int fan_config;
	106
	107	switch (reg) {
	108	case PMBUS_FAN_CONFIG_12:
da8e48ab	109	if (page > 0)
179144a0	110	return -ENXIO;
0c0a0615 GR	111
	112	ret = ucd9000_get_fan_config(client, 0);
	113	if (ret < 0)
	114	return ret;
	115	fan_config = ret << 4;
	116	ret = ucd9000_get_fan_config(client, 1);
	117	if (ret < 0)
	118	return ret;
	119	fan_config \|= ret;
	120	ret = fan_config;
	121	break;
	122	case PMBUS_FAN_CONFIG_34:
da8e48ab	123	if (page > 0)
179144a0	124	return -ENXIO;
0c0a0615 GR	125
	126	ret = ucd9000_get_fan_config(client, 2);
	127	if (ret < 0)
	128	return ret;
	129	fan_config = ret << 4;
	130	ret = ucd9000_get_fan_config(client, 3);
	131	if (ret < 0)
	132	return ret;
	133	fan_config \|= ret;
	134	ret = fan_config;
	135	break;
	136	default:
	137	ret = -ENODATA;
	138	break;
	139	}
	140	return ret;
	141	}
	142
	143	static const struct i2c_device_id ucd9000_id[] = {
	144	{"ucd9000", ucd9000},
	145	{"ucd90120", ucd90120},
	146	{"ucd90124", ucd90124},
50b2b02c	147	{"ucd90160", ucd90160},
0c0a0615 GR	148	{"ucd9090", ucd9090},
	149	{"ucd90910", ucd90910},
	150	{}
	151	};
	152	MODULE_DEVICE_TABLE(i2c, ucd9000_id);
	153
8881a191 JMC	154	static const struct of_device_id ucd9000_of_match[] = {
	155	{
	156	.compatible = "ti,ucd9000",
	157	.data = (void *)ucd9000
	158	},
	159	{
	160	.compatible = "ti,ucd90120",
	161	.data = (void *)ucd90120
	162	},
	163	{
	164	.compatible = "ti,ucd90124",
	165	.data = (void *)ucd90124
	166	},
	167	{
	168	.compatible = "ti,ucd90160",
	169	.data = (void *)ucd90160
	170	},
	171	{
	172	.compatible = "ti,ucd9090",
	173	.data = (void *)ucd9090
	174	},
	175	{
	176	.compatible = "ti,ucd90910",
	177	.data = (void *)ucd90910
	178	},
	179	{ },
	180	};
	181	MODULE_DEVICE_TABLE(of, ucd9000_of_match);
	182
ca781fb7 CB	183	#ifdef CONFIG_GPIOLIB
	184	static int ucd9000_gpio_read_config(struct i2c_client *client,
	185	unsigned int offset)
	186	{
	187	int ret;
	188
	189	/* No page set required */
	190	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
	191	if (ret < 0)
	192	return ret;
	193
	194	return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
	195	}
	196
	197	static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
	198	{
	199	struct i2c_client *client = gpiochip_get_data(gc);
	200	int ret;
	201
	202	ret = ucd9000_gpio_read_config(client, offset);
	203	if (ret < 0)
	204	return ret;
	205
	206	return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
	207	}
	208
	209	static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
	210	int value)
	211	{
	212	struct i2c_client *client = gpiochip_get_data(gc);
	213	int ret;
	214
	215	ret = ucd9000_gpio_read_config(client, offset);
	216	if (ret < 0) {
	217	dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
	218	offset, ret);
	219	return;
	220	}
	221
	222	if (value) {
	223	if (ret & UCD9000_GPIO_CONFIG_STATUS)
	224	return;
	225
	226	ret \|= UCD9000_GPIO_CONFIG_STATUS;
	227	} else {
	228	if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
	229	return;
	230
	231	ret &= ~UCD9000_GPIO_CONFIG_STATUS;
	232	}
	233
	234	ret \|= UCD9000_GPIO_CONFIG_ENABLE;
	235
	236	/* Page set not required */
	237	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	238	if (ret < 0) {
	239	dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
	240	offset, ret);
	241	return;
	242	}
	243
	244	ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
	245
	246	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
247	if (ret < 0)
248	dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
249	offset, ret);
250	}
251
252	static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
253	unsigned int offset)
254	{
255	struct i2c_client *client = gpiochip_get_data(gc);
256	int ret;
257
258	ret = ucd9000_gpio_read_config(client, offset);
259	if (ret < 0)
260	return ret;
261
262	return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
263	}
264
265	static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
266	unsigned int offset, bool direction_out,
267	int requested_out)
268	{
269	struct i2c_client *client = gpiochip_get_data(gc);
270	int ret, config, out_val;
271
272	ret = ucd9000_gpio_read_config(client, offset);
273	if (ret < 0)
274	return ret;
275
276	if (direction_out) {
277	out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
278
279	if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
280	if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
281	return 0;
282	} else {
283	ret \|= UCD9000_GPIO_CONFIG_OUT_ENABLE;
284	}
285
286	if (out_val)
287	ret \|= UCD9000_GPIO_CONFIG_OUT_VALUE;
288	else
289	ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
290
291	} else {
292	if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
293	return 0;
294
295	ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
296	}
297
298	ret \|= UCD9000_GPIO_CONFIG_ENABLE;
299	config = ret;
300
301	/* Page set not required */
302	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
303	if (ret < 0)
304	return ret;
305
306	config &= ~UCD9000_GPIO_CONFIG_ENABLE;
307
308	return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
309	}
310
311	static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
312	unsigned int offset)
313	{
314	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
315	}
316
317	static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
318	unsigned int offset, int val)
319	{
320	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
321	val);
322	}
323
324	static void ucd9000_probe_gpio(struct i2c_client *client,
325	const struct i2c_device_id *mid,
326	struct ucd9000_data *data)
327	{
328	int rc;
329
330	switch (mid->driver_data) {
331	case ucd9090:
332	data->gpio.ngpio = UCD9090_NUM_GPIOS;
333	break;
334	case ucd90120:
335	case ucd90124:
336	case ucd90160:
337	data->gpio.ngpio = UCD901XX_NUM_GPIOS;
338	break;
339	case ucd90910:
340	data->gpio.ngpio = UCD90910_NUM_GPIOS;
341	break;
342	default:
343	return; /* GPIO support is optional. */
344	}
345
346	/*
347	* Pinmux support has not been added to the new gpio_chip.
348	* This support should be added when possible given the mux
349	* behavior of these IO devices.
350	*/
351	data->gpio.label = client->name;
352	data->gpio.get_direction = ucd9000_gpio_get_direction;
353	data->gpio.direction_input = ucd9000_gpio_direction_input;
354	data->gpio.direction_output = ucd9000_gpio_direction_output;
355	data->gpio.get = ucd9000_gpio_get;
356	data->gpio.set = ucd9000_gpio_set;
357	data->gpio.can_sleep = true;
358	data->gpio.base = -1;
359	data->gpio.parent = &client->dev;
360
361	rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
362	if (rc)
363	dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
364	}
365	#else
366	static void ucd9000_probe_gpio(struct i2c_client *client,
367	const struct i2c_device_id *mid,
368	struct ucd9000_data *data)
369	{
370	}
371	#endif /* CONFIG_GPIOLIB */
372
72816cb0 CB	373	#ifdef CONFIG_DEBUG_FS
	374	static int ucd9000_get_mfr_status(struct i2c_client client, u8 buffer)
	375	{
	376	int ret = pmbus_set_page(client, 0);
	377
	378	if (ret < 0)
	379	return ret;
	380
	381	return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
	382	}
	383
	384	static int ucd9000_debugfs_show_mfr_status_bit(void data, u64 val)
	385	{
	386	struct ucd9000_debugfs_entry *entry = data;
	387	struct i2c_client *client = entry->client;
	388	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	389	int ret;
	390
	391	ret = ucd9000_get_mfr_status(client, buffer);
	392	if (ret < 0)
	393	return ret;
	394
	395	/*
	396	* Attribute only created for devices with gpi fault bits at bits
	397	* 16-23, which is the second byte of the response.
	398	*/
	399	*val = !!(buffer[1] & BIT(entry->index));
	400
	401	return 0;
	402	}
	403	DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
	404	ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
	405
	406	static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
	407	char __user *buf, size_t count,
	408	loff_t *ppos)
	409	{
	410	struct i2c_client *client = file->private_data;
	411	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	412	char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
	413	char *res;
	414	int rc;
	415
	416	rc = ucd9000_get_mfr_status(client, buffer);
	417	if (rc < 0)
	418	return rc;
	419
	420	res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
	421	*res++ = '\n';
	422	*res = 0;
	423
	424	return simple_read_from_buffer(buf, count, ppos, str, res - str);
	425	}
	426
	427	static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
	428	.llseek = noop_llseek,
	429	.read = ucd9000_debugfs_read_mfr_status,
	430	.open = simple_open,
	431	};
	432
	433	static int ucd9000_init_debugfs(struct i2c_client *client,
	434	const struct i2c_device_id *mid,
	435	struct ucd9000_data *data)
	436	{
437	struct dentry *debugfs;
438	struct ucd9000_debugfs_entry *entries;
439	int i;
440	char name[UCD9000_DEBUGFS_NAME_LEN];
441
442	debugfs = pmbus_get_debugfs_dir(client);
443	if (!debugfs)
444	return -ENOENT;
445
446	data->debugfs = debugfs_create_dir(client->name, debugfs);
447	if (!data->debugfs)
448	return -ENOENT;
449
450	/*
451	* Of the chips this driver supports, only the UCD9090, UCD90160,
452	* and UCD90910 report GPI faults in their MFR_STATUS register, so only
453	* create the GPI fault debugfs attributes for those chips.
454	*/
455	if (mid->driver_data == ucd9090 \|\| mid->driver_data == ucd90160 \|\|
456	mid->driver_data == ucd90910) {
a86854d0 KC	457	entries = devm_kcalloc(&client->dev,
a86854d0 KC	458	UCD9000_GPI_COUNT, sizeof(*entries),
72816cb0 CB	459	GFP_KERNEL);
	460	if (!entries)
	461	return -ENOMEM;
	462
	463	for (i = 0; i < UCD9000_GPI_COUNT; i++) {
	464	entries[i].client = client;
	465	entries[i].index = i;
	466	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
	467	"gpi%d_alarm", i + 1);
	468	debugfs_create_file(name, 0444, data->debugfs,
	469	&entries[i],
	470	&ucd9000_debugfs_mfr_status_bit);
	471	}
	472	}
	473
	474	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
	475	debugfs_create_file(name, 0444, data->debugfs, client,
	476	&ucd9000_debugfs_show_mfr_status_fops);
	477
	478	return 0;
	479	}
	480	#else
	481	static int ucd9000_init_debugfs(struct i2c_client *client,
	482	const struct i2c_device_id *mid,
	483	struct ucd9000_data *data)
	484	{
	485	return 0;
	486	}
	487	#endif /* CONFIG_DEBUG_FS */
	488
0c0a0615 GR	489	static int ucd9000_probe(struct i2c_client *client,
	490	const struct i2c_device_id *id)
	491	{
	492	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	493	struct ucd9000_data *data;
	494	struct pmbus_driver_info *info;
	495	const struct i2c_device_id *mid;
8881a191	496	enum chips chip;
0c0a0615 GR	497	int i, ret;
	498
	499	if (!i2c_check_functionality(client->adapter,
	500	I2C_FUNC_SMBUS_BYTE_DATA \|
	501	I2C_FUNC_SMBUS_BLOCK_DATA))
	502	return -ENODEV;
	503
	504	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
	505	block_buffer);
	506	if (ret < 0) {
	507	dev_err(&client->dev, "Failed to read device ID\n");
	508	return ret;
	509	}
	510	block_buffer[ret] = '\0';
	511	dev_info(&client->dev, "Device ID %s\n", block_buffer);
	512
f020b007	513	for (mid = ucd9000_id; mid->name[0]; mid++) {
0c0a0615 GR	514	if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	515	break;
	516	}
f020b007	517	if (!mid->name[0]) {
0c0a0615 GR	518	dev_err(&client->dev, "Unsupported device\n");
	519	return -ENODEV;
	520	}
	521
8881a191 JMC	522	if (client->dev.of_node)
	523	chip = (enum chips)of_device_get_match_data(&client->dev);
	524	else
	525	chip = id->driver_data;
	526
	527	if (chip != ucd9000 && chip != mid->driver_data)
0c0a0615 GR	528	dev_notice(&client->dev,
	529	"Device mismatch: Configured %s, detected %s\n",
	530	id->name, mid->name);
	531
8b313ca7 GR	532	data = devm_kzalloc(&client->dev, sizeof(struct ucd9000_data),
8b313ca7 GR	533	GFP_KERNEL);
0c0a0615 GR	534	if (!data)
	535	return -ENOMEM;
	536	info = &data->info;
	537
	538	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	539	if (ret < 0) {
	540	dev_err(&client->dev,
	541	"Failed to read number of active pages\n");
8b313ca7	542	return ret;
0c0a0615 GR	543	}
	544	info->pages = ret;
	545	if (!info->pages) {
	546	dev_err(&client->dev, "No pages configured\n");
8b313ca7	547	return -ENODEV;
0c0a0615 GR	548	}
	549
	550	/* The internal temperature sensor is always active */
	551	info->func[0] = PMBUS_HAVE_TEMP;
	552
	553	/* Everything else is configurable */
	554	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
	555	block_buffer);
	556	if (ret <= 0) {
	557	dev_err(&client->dev, "Failed to read configuration data\n");
8b313ca7	558	return -ENODEV;
0c0a0615 GR	559	}
	560	for (i = 0; i < ret; i++) {
	561	int page = UCD9000_MON_PAGE(block_buffer[i]);
	562
	563	if (page >= info->pages)
	564	continue;
	565
	566	switch (UCD9000_MON_TYPE(block_buffer[i])) {
	567	case UCD9000_MON_VOLTAGE:
	568	case UCD9000_MON_VOLTAGE_HW:
	569	info->func[page] \|= PMBUS_HAVE_VOUT
	570	\| PMBUS_HAVE_STATUS_VOUT;
	571	break;
	572	case UCD9000_MON_TEMPERATURE:
	573	info->func[page] \|= PMBUS_HAVE_TEMP2
	574	\| PMBUS_HAVE_STATUS_TEMP;
	575	break;
	576	case UCD9000_MON_CURRENT:
	577	info->func[page] \|= PMBUS_HAVE_IOUT
	578	\| PMBUS_HAVE_STATUS_IOUT;
	579	break;
	580	default:
	581	break;
	582	}
	583	}
	584
	585	/* Fan configuration */
	586	if (mid->driver_data == ucd90124) {
	587	for (i = 0; i < UCD9000_NUM_FAN; i++) {
	588	i2c_smbus_write_byte_data(client,
	589	UCD9000_FAN_CONFIG_INDEX, i);
	590	ret = i2c_smbus_read_block_data(client,
	591	UCD9000_FAN_CONFIG,
	592	data->fan_data[i]);
	593	if (ret < 0)
8b313ca7	594	return ret;
0c0a0615 GR	595	}
	596	i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
	597
	598	info->read_byte_data = ucd9000_read_byte_data;
	599	info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
	600	\| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
	601	}
	602
ca781fb7 CB	603	ucd9000_probe_gpio(client, mid, data);
ca781fb7 CB	604
72816cb0 CB	605	ret = pmbus_do_probe(client, mid, info);
	606	if (ret)
	607	return ret;
	608
	609	ret = ucd9000_init_debugfs(client, mid, data);
	610	if (ret)
	611	dev_warn(&client->dev, "Failed to register debugfs: %d\n",
	612	ret);
	613
	614	return 0;
0c0a0615 GR	615	}
0c0a0615 GR	616
0c0a0615 GR	617	/* This is the driver that will be inserted */
	618	static struct i2c_driver ucd9000_driver = {
	619	.driver = {
	620	.name = "ucd9000",
8881a191	621	.of_match_table = of_match_ptr(ucd9000_of_match),
0c0a0615 GR	622	},
0c0a0615 GR	623	.probe = ucd9000_probe,
dd285ad7	624	.remove = pmbus_do_remove,
0c0a0615 GR	625	.id_table = ucd9000_id,
	626	};
	627
f0967eea	628	module_i2c_driver(ucd9000_driver);
0c0a0615 GR	629
	630	MODULE_AUTHOR("Guenter Roeck");
	631	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	632	MODULE_LICENSE("GPL");