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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for UCD90xxx Sequencer and System Health
 * Controller series
 *
 * Copyright (C) 2011 Ericsson AB.
 */

#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/driver.h>
#include "pmbus.h"

enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, 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) & 0x1f)

#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 UCD90320_NUM_GPIOS	84
#define UCD90910_NUM_GPIOS	26

#define UCD9000_DEBUGFS_NAME_LEN	24
#define UCD9000_GPI_COUNT		8
#define UCD90320_GPI_COUNT		32

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},
	{"ucd90320", ucd90320},
	{"ucd9090", ucd9090},
	{"ucd90910", ucd90910},
	{}
};
MODULE_DEVICE_TABLE(i2c, ucd9000_id);

static const struct of_device_id __maybe_unused 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,ucd90320",
		.data = (void *)ucd90320
	},
	{
		.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 ucd90320:
		data->gpio.ngpio = UCD90320_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, 0xff);

	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, i;

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

	/*
	 * GPI fault bits are in sets of 8, two bytes from end of response.
	 */
	i = ret - 3 - entry->index / 8;
	if (i >= 0)
		*val = !!(buffer[i] & BIT(entry->index % 8));

	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, gpi_count;
	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,
	 * UCD90320, 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 == ucd90320 || mid->driver_data == ucd90910) {
		gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
							 : UCD9000_GPI_COUNT;
		entries = devm_kcalloc(&client->dev,
				       gpi_count, sizeof(*entries),
				       GFP_KERNEL);
		if (!entries)
			return -ENOMEM;

		for (i = 0; i < 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)
{
	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 = mid->driver_data;

	if (chip != ucd9000 && 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 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, 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_new = ucd9000_probe,
	.id_table = ucd9000_id,
};

module_i2c_driver(ucd9000_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
0c0a0615 GR	2	/*
	3	* Hardware monitoring driver for UCD90xxx Sequencer and System Health
	4	* Controller series
	5	*
	6	* Copyright (C) 2011 Ericsson AB.
0c0a0615 GR	7	*/
0c0a0615 GR	8
72816cb0	9	#include <linux/debugfs.h>
0c0a0615 GR	10	#include <linux/kernel.h>
0c0a0615 GR	11	#include <linux/module.h>
8881a191	12	#include <linux/of_device.h>
0c0a0615 GR	13	#include <linux/init.h>
	14	#include <linux/err.h>
	15	#include <linux/slab.h>
	16	#include <linux/i2c.h>
4ba1bb12	17	#include <linux/pmbus.h>
ca781fb7	18	#include <linux/gpio/driver.h>
0c0a0615 GR	19	#include "pmbus.h"
0c0a0615 GR	20
a470f11c JW	21	enum chips { ucd9000, ucd90120, ucd90124, ucd90160, ucd90320, ucd9090,
a470f11c JW	22	ucd90910 };
0c0a0615 GR	23
	24	#define UCD9000_MONITOR_CONFIG 0xd5
	25	#define UCD9000_NUM_PAGES 0xd6
	26	#define UCD9000_FAN_CONFIG_INDEX 0xe7
	27	#define UCD9000_FAN_CONFIG 0xe8
72816cb0	28	#define UCD9000_MFR_STATUS 0xf3
ca781fb7 CB	29	#define UCD9000_GPIO_SELECT 0xfa
ca781fb7 CB	30	#define UCD9000_GPIO_CONFIG 0xfb
0c0a0615 GR	31	#define UCD9000_DEVICE_ID 0xfd
0c0a0615 GR	32
ca781fb7 CB	33	/* GPIO CONFIG bits */
	34	#define UCD9000_GPIO_CONFIG_ENABLE BIT(0)
	35	#define UCD9000_GPIO_CONFIG_OUT_ENABLE BIT(1)
	36	#define UCD9000_GPIO_CONFIG_OUT_VALUE BIT(2)
	37	#define UCD9000_GPIO_CONFIG_STATUS BIT(3)
	38	#define UCD9000_GPIO_INPUT 0
	39	#define UCD9000_GPIO_OUTPUT 1
	40
0c0a0615	41	#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
a470f11c	42	#define UCD9000_MON_PAGE(x) ((x) & 0x1f)
0c0a0615 GR	43
	44	#define UCD9000_MON_VOLTAGE 1
	45	#define UCD9000_MON_TEMPERATURE 2
	46	#define UCD9000_MON_CURRENT 3
	47	#define UCD9000_MON_VOLTAGE_HW 4
	48
	49	#define UCD9000_NUM_FAN 4
	50
ca781fb7 CB	51	#define UCD9000_GPIO_NAME_LEN 16
	52	#define UCD9090_NUM_GPIOS 23
	53	#define UCD901XX_NUM_GPIOS 26
a470f11c	54	#define UCD90320_NUM_GPIOS 84
ca781fb7 CB	55	#define UCD90910_NUM_GPIOS 26
ca781fb7 CB	56
72816cb0 CB	57	#define UCD9000_DEBUGFS_NAME_LEN 24
72816cb0 CB	58	#define UCD9000_GPI_COUNT 8
a470f11c	59	#define UCD90320_GPI_COUNT 32
72816cb0	60
0c0a0615 GR	61	struct ucd9000_data {
	62	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	63	struct pmbus_driver_info info;
ca781fb7 CB	64	#ifdef CONFIG_GPIOLIB
	65	struct gpio_chip gpio;
	66	#endif
72816cb0	67	struct dentry *debugfs;
0c0a0615 GR	68	};
	69	#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
	70
72816cb0 CB	71	struct ucd9000_debugfs_entry {
	72	struct i2c_client *client;
	73	u8 index;
	74	};
	75
0c0a0615 GR	76	static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	77	{
	78	int fan_config = 0;
	79	struct ucd9000_data *data
	80	= to_ucd9000_data(pmbus_get_driver_info(client));
	81
	82	if (data->fan_data[fan][3] & 1)
	83	fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */
	84
	85	/* Pulses/revolution */
	86	fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;
	87
	88	return fan_config;
	89	}
	90
	91	static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
	92	{
	93	int ret = 0;
	94	int fan_config;
	95
	96	switch (reg) {
	97	case PMBUS_FAN_CONFIG_12:
da8e48ab	98	if (page > 0)
179144a0	99	return -ENXIO;
0c0a0615 GR	100
	101	ret = ucd9000_get_fan_config(client, 0);
	102	if (ret < 0)
	103	return ret;
	104	fan_config = ret << 4;
	105	ret = ucd9000_get_fan_config(client, 1);
	106	if (ret < 0)
	107	return ret;
	108	fan_config \|= ret;
	109	ret = fan_config;
	110	break;
	111	case PMBUS_FAN_CONFIG_34:
da8e48ab	112	if (page > 0)
179144a0	113	return -ENXIO;
0c0a0615 GR	114
	115	ret = ucd9000_get_fan_config(client, 2);
	116	if (ret < 0)
	117	return ret;
	118	fan_config = ret << 4;
	119	ret = ucd9000_get_fan_config(client, 3);
	120	if (ret < 0)
	121	return ret;
	122	fan_config \|= ret;
	123	ret = fan_config;
	124	break;
	125	default:
	126	ret = -ENODATA;
	127	break;
	128	}
	129	return ret;
	130	}
	131
	132	static const struct i2c_device_id ucd9000_id[] = {
	133	{"ucd9000", ucd9000},
	134	{"ucd90120", ucd90120},
	135	{"ucd90124", ucd90124},
50b2b02c	136	{"ucd90160", ucd90160},
a470f11c	137	{"ucd90320", ucd90320},
0c0a0615 GR	138	{"ucd9090", ucd9090},
	139	{"ucd90910", ucd90910},
	140	{}
	141	};
	142	MODULE_DEVICE_TABLE(i2c, ucd9000_id);
	143
64e51162	144	static const struct of_device_id __maybe_unused ucd9000_of_match[] = {
8881a191 JMC	145	{
	146	.compatible = "ti,ucd9000",
	147	.data = (void *)ucd9000
	148	},
	149	{
	150	.compatible = "ti,ucd90120",
	151	.data = (void *)ucd90120
	152	},
	153	{
	154	.compatible = "ti,ucd90124",
	155	.data = (void *)ucd90124
	156	},
	157	{
	158	.compatible = "ti,ucd90160",
	159	.data = (void *)ucd90160
	160	},
a470f11c JW	161	{
	162	.compatible = "ti,ucd90320",
	163	.data = (void *)ucd90320
	164	},
8881a191 JMC	165	{
	166	.compatible = "ti,ucd9090",
	167	.data = (void *)ucd9090
	168	},
	169	{
	170	.compatible = "ti,ucd90910",
	171	.data = (void *)ucd90910
	172	},
	173	{ },
	174	};
	175	MODULE_DEVICE_TABLE(of, ucd9000_of_match);
	176
ca781fb7 CB	177	#ifdef CONFIG_GPIOLIB
	178	static int ucd9000_gpio_read_config(struct i2c_client *client,
	179	unsigned int offset)
	180	{
	181	int ret;
	182
	183	/* No page set required */
	184	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_SELECT, offset);
	185	if (ret < 0)
	186	return ret;
	187
	188	return i2c_smbus_read_byte_data(client, UCD9000_GPIO_CONFIG);
	189	}
	190
	191	static int ucd9000_gpio_get(struct gpio_chip *gc, unsigned int offset)
	192	{
	193	struct i2c_client *client = gpiochip_get_data(gc);
	194	int ret;
	195
	196	ret = ucd9000_gpio_read_config(client, offset);
	197	if (ret < 0)
	198	return ret;
	199
	200	return !!(ret & UCD9000_GPIO_CONFIG_STATUS);
	201	}
	202
	203	static void ucd9000_gpio_set(struct gpio_chip *gc, unsigned int offset,
	204	int value)
	205	{
	206	struct i2c_client *client = gpiochip_get_data(gc);
	207	int ret;
	208
	209	ret = ucd9000_gpio_read_config(client, offset);
	210	if (ret < 0) {
	211	dev_dbg(&client->dev, "failed to read GPIO %d config: %d\n",
	212	offset, ret);
	213	return;
	214	}
	215
	216	if (value) {
	217	if (ret & UCD9000_GPIO_CONFIG_STATUS)
	218	return;
	219
	220	ret \|= UCD9000_GPIO_CONFIG_STATUS;
	221	} else {
	222	if (!(ret & UCD9000_GPIO_CONFIG_STATUS))
	223	return;
	224
	225	ret &= ~UCD9000_GPIO_CONFIG_STATUS;
	226	}
	227
	228	ret \|= UCD9000_GPIO_CONFIG_ENABLE;
	229
	230	/* Page set not required */
	231	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
	232	if (ret < 0) {
	233	dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
	234	offset, ret);
	235	return;
	236	}
	237
	238	ret &= ~UCD9000_GPIO_CONFIG_ENABLE;
	239
	240	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, ret);
241	if (ret < 0)
242	dev_dbg(&client->dev, "Failed to write GPIO %d config: %d\n",
243	offset, ret);
244	}
245
246	static int ucd9000_gpio_get_direction(struct gpio_chip *gc,
247	unsigned int offset)
248	{
249	struct i2c_client *client = gpiochip_get_data(gc);
250	int ret;
251
252	ret = ucd9000_gpio_read_config(client, offset);
253	if (ret < 0)
254	return ret;
255
256	return !(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE);
257	}
258
259	static int ucd9000_gpio_set_direction(struct gpio_chip *gc,
260	unsigned int offset, bool direction_out,
261	int requested_out)
262	{
263	struct i2c_client *client = gpiochip_get_data(gc);
264	int ret, config, out_val;
265
266	ret = ucd9000_gpio_read_config(client, offset);
267	if (ret < 0)
268	return ret;
269
270	if (direction_out) {
271	out_val = requested_out ? UCD9000_GPIO_CONFIG_OUT_VALUE : 0;
272
273	if (ret & UCD9000_GPIO_CONFIG_OUT_ENABLE) {
274	if ((ret & UCD9000_GPIO_CONFIG_OUT_VALUE) == out_val)
275	return 0;
276	} else {
277	ret \|= UCD9000_GPIO_CONFIG_OUT_ENABLE;
278	}
279
280	if (out_val)
281	ret \|= UCD9000_GPIO_CONFIG_OUT_VALUE;
282	else
283	ret &= ~UCD9000_GPIO_CONFIG_OUT_VALUE;
284
285	} else {
286	if (!(ret & UCD9000_GPIO_CONFIG_OUT_ENABLE))
287	return 0;
288
289	ret &= ~UCD9000_GPIO_CONFIG_OUT_ENABLE;
290	}
291
292	ret \|= UCD9000_GPIO_CONFIG_ENABLE;
293	config = ret;
294
295	/* Page set not required */
296	ret = i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
297	if (ret < 0)
298	return ret;
299
300	config &= ~UCD9000_GPIO_CONFIG_ENABLE;
301
302	return i2c_smbus_write_byte_data(client, UCD9000_GPIO_CONFIG, config);
303	}
304
305	static int ucd9000_gpio_direction_input(struct gpio_chip *gc,
306	unsigned int offset)
307	{
308	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_INPUT, 0);
309	}
310
311	static int ucd9000_gpio_direction_output(struct gpio_chip *gc,
312	unsigned int offset, int val)
313	{
314	return ucd9000_gpio_set_direction(gc, offset, UCD9000_GPIO_OUTPUT,
315	val);
316	}
317
318	static void ucd9000_probe_gpio(struct i2c_client *client,
319	const struct i2c_device_id *mid,
320	struct ucd9000_data *data)
321	{
322	int rc;
323
324	switch (mid->driver_data) {
325	case ucd9090:
326	data->gpio.ngpio = UCD9090_NUM_GPIOS;
327	break;
328	case ucd90120:
329	case ucd90124:
330	case ucd90160:
331	data->gpio.ngpio = UCD901XX_NUM_GPIOS;
332	break;
a470f11c JW	333	case ucd90320:
	334	data->gpio.ngpio = UCD90320_NUM_GPIOS;
	335	break;
ca781fb7 CB	336	case ucd90910:
	337	data->gpio.ngpio = UCD90910_NUM_GPIOS;
	338	break;
	339	default:
	340	return; /* GPIO support is optional. */
	341	}
	342
	343	/*
	344	* Pinmux support has not been added to the new gpio_chip.
	345	* This support should be added when possible given the mux
	346	* behavior of these IO devices.
	347	*/
	348	data->gpio.label = client->name;
	349	data->gpio.get_direction = ucd9000_gpio_get_direction;
	350	data->gpio.direction_input = ucd9000_gpio_direction_input;
	351	data->gpio.direction_output = ucd9000_gpio_direction_output;
	352	data->gpio.get = ucd9000_gpio_get;
	353	data->gpio.set = ucd9000_gpio_set;
	354	data->gpio.can_sleep = true;
	355	data->gpio.base = -1;
	356	data->gpio.parent = &client->dev;
	357
	358	rc = devm_gpiochip_add_data(&client->dev, &data->gpio, client);
	359	if (rc)
	360	dev_warn(&client->dev, "Could not add gpiochip: %d\n", rc);
	361	}
	362	#else
	363	static void ucd9000_probe_gpio(struct i2c_client *client,
	364	const struct i2c_device_id *mid,
	365	struct ucd9000_data *data)
	366	{
	367	}
	368	#endif /* CONFIG_GPIOLIB */
	369
72816cb0 CB	370	#ifdef CONFIG_DEBUG_FS
	371	static int ucd9000_get_mfr_status(struct i2c_client client, u8 buffer)
	372	{
43f33b6e	373	int ret = pmbus_set_page(client, 0, 0xff);
72816cb0 CB	374
	375	if (ret < 0)
	376	return ret;
	377
	378	return i2c_smbus_read_block_data(client, UCD9000_MFR_STATUS, buffer);
	379	}
	380
	381	static int ucd9000_debugfs_show_mfr_status_bit(void data, u64 val)
	382	{
	383	struct ucd9000_debugfs_entry *entry = data;
	384	struct i2c_client *client = entry->client;
	385	u8 buffer[I2C_SMBUS_BLOCK_MAX];
a470f11c	386	int ret, i;
72816cb0 CB	387
	388	ret = ucd9000_get_mfr_status(client, buffer);
	389	if (ret < 0)
	390	return ret;
	391
	392	/*
a470f11c	393	* GPI fault bits are in sets of 8, two bytes from end of response.
72816cb0	394	*/
a470f11c JW	395	i = ret - 3 - entry->index / 8;
	396	if (i >= 0)
	397	*val = !!(buffer[i] & BIT(entry->index % 8));
72816cb0 CB	398
	399	return 0;
	400	}
	401	DEFINE_DEBUGFS_ATTRIBUTE(ucd9000_debugfs_mfr_status_bit,
	402	ucd9000_debugfs_show_mfr_status_bit, NULL, "%1lld\n");
	403
	404	static ssize_t ucd9000_debugfs_read_mfr_status(struct file *file,
	405	char __user *buf, size_t count,
	406	loff_t *ppos)
	407	{
	408	struct i2c_client *client = file->private_data;
	409	u8 buffer[I2C_SMBUS_BLOCK_MAX];
	410	char str[(I2C_SMBUS_BLOCK_MAX * 2) + 2];
	411	char *res;
	412	int rc;
	413
	414	rc = ucd9000_get_mfr_status(client, buffer);
	415	if (rc < 0)
	416	return rc;
	417
	418	res = bin2hex(str, buffer, min(rc, I2C_SMBUS_BLOCK_MAX));
	419	*res++ = '\n';
	420	*res = 0;
	421
	422	return simple_read_from_buffer(buf, count, ppos, str, res - str);
	423	}
	424
	425	static const struct file_operations ucd9000_debugfs_show_mfr_status_fops = {
	426	.llseek = noop_llseek,
	427	.read = ucd9000_debugfs_read_mfr_status,
	428	.open = simple_open,
	429	};
	430
	431	static int ucd9000_init_debugfs(struct i2c_client *client,
	432	const struct i2c_device_id *mid,
	433	struct ucd9000_data *data)
	434	{
	435	struct dentry *debugfs;
	436	struct ucd9000_debugfs_entry *entries;
a470f11c	437	int i, gpi_count;
72816cb0 CB	438	char name[UCD9000_DEBUGFS_NAME_LEN];
	439
	440	debugfs = pmbus_get_debugfs_dir(client);
	441	if (!debugfs)
	442	return -ENOENT;
	443
	444	data->debugfs = debugfs_create_dir(client->name, debugfs);
	445	if (!data->debugfs)
	446	return -ENOENT;
	447
	448	/*
	449	* Of the chips this driver supports, only the UCD9090, UCD90160,
a470f11c JW	450	* UCD90320, and UCD90910 report GPI faults in their MFR_STATUS
	451	* register, so only create the GPI fault debugfs attributes for those
	452	* chips.
72816cb0 CB	453	*/
72816cb0 CB	454	if (mid->driver_data == ucd9090 \|\| mid->driver_data == ucd90160 \|\|
a470f11c JW	455	mid->driver_data == ucd90320 \|\| mid->driver_data == ucd90910) {
	456	gpi_count = mid->driver_data == ucd90320 ? UCD90320_GPI_COUNT
	457	: UCD9000_GPI_COUNT;
a86854d0	458	entries = devm_kcalloc(&client->dev,
a470f11c	459	gpi_count, sizeof(*entries),
72816cb0 CB	460	GFP_KERNEL);
	461	if (!entries)
	462	return -ENOMEM;
	463
a470f11c	464	for (i = 0; i < gpi_count; i++) {
72816cb0 CB	465	entries[i].client = client;
	466	entries[i].index = i;
	467	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN,
	468	"gpi%d_alarm", i + 1);
	469	debugfs_create_file(name, 0444, data->debugfs,
	470	&entries[i],
	471	&ucd9000_debugfs_mfr_status_bit);
	472	}
	473	}
	474
	475	scnprintf(name, UCD9000_DEBUGFS_NAME_LEN, "mfr_status");
	476	debugfs_create_file(name, 0444, data->debugfs, client,
	477	&ucd9000_debugfs_show_mfr_status_fops);
	478
	479	return 0;
	480	}
	481	#else
	482	static int ucd9000_init_debugfs(struct i2c_client *client,
	483	const struct i2c_device_id *mid,
	484	struct ucd9000_data *data)
	485	{
	486	return 0;
	487	}
	488	#endif /* CONFIG_DEBUG_FS */
	489
dd431939	490	static int ucd9000_probe(struct i2c_client *client)
0c0a0615 GR	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
dd431939	525	chip = mid->driver_data;
8881a191	526
dd431939	527	if (chip != ucd9000 && strcmp(client->name, mid->name) != 0)
0c0a0615 GR	528	dev_notice(&client->dev,
0c0a0615 GR	529	"Device mismatch: Configured %s, detected %s\n",
dd431939	530	client->name, mid->name);
0c0a0615	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
dd431939	605	ret = pmbus_do_probe(client, info);
72816cb0 CB	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	622	},
dd431939	623	.probe_new = ucd9000_probe,
0c0a0615 GR	624	.id_table = ucd9000_id,
	625	};
	626
f0967eea	627	module_i2c_driver(ucd9000_driver);
0c0a0615 GR	628
	629	MODULE_AUTHOR("Guenter Roeck");
	630	MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	631	MODULE_LICENSE("GPL");
b94ca77e	632	MODULE_IMPORT_NS(PMBUS);