Merge tag 'ds2760-for-v4.19-signed' into psy-next

Devicetree bindings for Maxim DS2760

====================================

The ds2760 is a w1 slave device and must hence have its sub-node in DT

under a w1 bus master node.

The device exposes a power supply, so the details described in

Documentation/devicetree/bindings/power/supply/power_supply.txt apply.

Required properties:

- compatible: must be "maxim,ds2760"

Optional properties:

- power-supplies:	Refers to one or more power supplies connected to

			this battery.

- maxim,pmod-enabled:	This boolean property enables the DS2760 to enter

			sleep mode when the DQ line goes low for greater

			than 2 seconds and leave sleep Mode when the DQ

			line goes high.

- maxim,cache-time-ms:	Time im milliseconds to cache the data for. When

			this time expires, the values are read again from

			the hardware. Defaults to 1000.

- rated-capacity-microamp-hours:

			The rated capacity of the battery, in mAh.

			If not specified, the value stored in the

			non-volatile chip memory is used.

 - linux,open-drain: if specified, the data pin is considered in

		     open-drain mode.

Also refer to the generic w1.txt document.

Examples:

	onewire@0 {

	onewire {

		compatible = "w1-gpio";

		gpios = <&gpio 126 0>, <&gpio 105 0>;

	};

		gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;

		battery {

			// ...

		};

	};

Generic devicetree bindings for onewire (w1) busses

===================================================

Onewire busses are described through nodes of their master bus controller.

Slave devices are listed as sub-nodes of such master devices. For now, only

one slave is allowed per bus master.

Example:

	charger: charger {

		compatible = "gpio-charger";

		charger-type = "mains";

		gpios = <&gpio 1 GPIO_ACTIVE_LOW>;

	};

	onewire {

		compatible = "w1-gpio";

		gpios = <&gpio 100 0>, <&gpio 101 0>;

		battery {

			compatible = "maxim,ds2760";

			power-supplies = <&charger>;

		};

	};

config BATTERY_DS2760

	tristate "DS2760 battery driver (HP iPAQ & others)"

	depends on W1 && W1_SLAVE_DS2760

	depends on W1

	help

	  Say Y here to enable support for batteries with ds2760 chip.

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/suspend.h>

#include <linux/w1.h>

#include "../../w1/slaves/w1_ds2760.h"

#include <linux/of.h>

static unsigned int cache_time = 1000;

module_param(cache_time, uint, 0644);

MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

static bool pmod_enabled;

module_param(pmod_enabled, bool, 0644);

MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");

static unsigned int rated_capacity;

module_param(rated_capacity, uint, 0644);

MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");

static unsigned int current_accum;

module_param(current_accum, uint, 0644);

MODULE_PARM_DESC(current_accum, "current accumulator value");

#define W1_FAMILY_DS2760		0x30

/* Known commands to the DS2760 chip */

#define W1_DS2760_SWAP			0xAA

#define W1_DS2760_READ_DATA		0x69

#define W1_DS2760_WRITE_DATA		0x6C

#define W1_DS2760_COPY_DATA		0x48

#define W1_DS2760_RECALL_DATA		0xB8

#define W1_DS2760_LOCK			0x6A

/* Number of valid register addresses */

#define DS2760_DATA_SIZE		0x40

#define DS2760_PROTECTION_REG		0x00

#define DS2760_STATUS_REG		0x01

#define DS2760_STATUS_IE		(1 << 2)

#define DS2760_STATUS_SWEN		(1 << 3)

#define DS2760_STATUS_RNAOP		(1 << 4)

#define DS2760_STATUS_PMOD		(1 << 5)

#define DS2760_EEPROM_REG		0x07

#define DS2760_SPECIAL_FEATURE_REG	0x08

#define DS2760_VOLTAGE_MSB		0x0c

#define DS2760_VOLTAGE_LSB		0x0d

#define DS2760_CURRENT_MSB		0x0e

#define DS2760_CURRENT_LSB		0x0f

#define DS2760_CURRENT_ACCUM_MSB	0x10

#define DS2760_CURRENT_ACCUM_LSB	0x11

#define DS2760_TEMP_MSB			0x18

#define DS2760_TEMP_LSB			0x19

#define DS2760_EEPROM_BLOCK0		0x20

#define DS2760_ACTIVE_FULL		0x20

#define DS2760_EEPROM_BLOCK1		0x30

#define DS2760_STATUS_WRITE_REG		0x31

#define DS2760_RATED_CAPACITY		0x32

#define DS2760_CURRENT_OFFSET_BIAS	0x33

#define DS2760_ACTIVE_EMPTY		0x3b

struct ds2760_device_info {

	struct device *dev;

	int full_counter;

	struct power_supply *bat;

	struct power_supply_desc bat_desc;

	struct device *w1_dev;

	struct workqueue_struct *monitor_wqueue;

	struct delayed_work monitor_work;

	struct delayed_work set_charged_work;

	struct notifier_block pm_notifier;

};

static unsigned int cache_time = 1000;

module_param(cache_time, uint, 0644);

MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,

			int io)

{

	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);

static bool pmod_enabled;

module_param(pmod_enabled, bool, 0644);

MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");

	if (!dev)

		return 0;

static unsigned int rated_capacity;

module_param(rated_capacity, uint, 0644);

MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");

	mutex_lock(&sl->master->bus_mutex);

static unsigned int current_accum;

module_param(current_accum, uint, 0644);

MODULE_PARM_DESC(current_accum, "current accumulator value");

	if (addr > DS2760_DATA_SIZE || addr < 0) {

		count = 0;

		goto out;

	}

	if (addr + count > DS2760_DATA_SIZE)

		count = DS2760_DATA_SIZE - addr;

	if (!w1_reset_select_slave(sl)) {

		if (!io) {

			w1_write_8(sl->master, W1_DS2760_READ_DATA);

			w1_write_8(sl->master, addr);

			count = w1_read_block(sl->master, buf, count);

		} else {

			w1_write_8(sl->master, W1_DS2760_WRITE_DATA);

			w1_write_8(sl->master, addr);

			w1_write_block(sl->master, buf, count);

			/* XXX w1_write_block returns void, not n_written */

		}

	}

out:

	mutex_unlock(&sl->master->bus_mutex);

	return count;

}

static int w1_ds2760_read(struct device *dev,

			  char *buf, int addr,

			  size_t count)

{

	return w1_ds2760_io(dev, buf, addr, count, 0);

}

static int w1_ds2760_write(struct device *dev,

			   char *buf,

			   int addr, size_t count)

{

	return w1_ds2760_io(dev, buf, addr, count, 1);

}

static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)

{

	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);

	if (!dev)

		return -EINVAL;

	mutex_lock(&sl->master->bus_mutex);

	if (w1_reset_select_slave(sl) == 0) {

		w1_write_8(sl->master, cmd);

		w1_write_8(sl->master, addr);

	}

	mutex_unlock(&sl->master->bus_mutex);

	return 0;

}

static int w1_ds2760_store_eeprom(struct device *dev, int addr)

{

	return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);

}

static int w1_ds2760_recall_eeprom(struct device *dev, int addr)

{

	return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);

}

static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,

			     struct bin_attribute *bin_attr, char *buf,

			     loff_t off, size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	return w1_ds2760_read(dev, buf, off, count);

}

static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);

static struct bin_attribute *w1_ds2760_bin_attrs[] = {

	&bin_attr_w1_slave,

	NULL,

};

static const struct attribute_group w1_ds2760_group = {

	.bin_attrs = w1_ds2760_bin_attrs,

};

static const struct attribute_group *w1_ds2760_groups[] = {

	&w1_ds2760_group,

	NULL,

};

/* Some batteries have their rated capacity stored a N * 10 mAh, while

 * others use an index into this table. */

static int rated_capacities[] = {

		count = DS2760_TEMP_LSB - start + 1;

	}

	ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);

	ret = w1_ds2760_read(di->dev, di->raw + start, start, count);

	if (ret != count) {

		dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",

			 di->w1_dev);

			 di->dev);

		return 1;

	}

	acr[0] = acr_val >> 8;

	acr[1] = acr_val & 0xff;

	if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)

	if (w1_ds2760_write(di->dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)

		dev_warn(di->dev, "ACR write failed\n");

}

	if (status == di->raw[DS2760_STATUS_REG])

		return;

	w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);

	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_write(di->dev, &status, DS2760_STATUS_WRITE_REG, 1);

	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

}

static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,

	if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])

		return;

	w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);

	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_write(di->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);

	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

}

static void ds2760_battery_write_active_full(struct ds2760_device_info *di,

	    tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])

		return;

	w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));

	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);

	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);

	w1_ds2760_write(di->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));

	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0);

	w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK0);

	/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL

	 * values won't be read back by ds2760_battery_read_status() */

	dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);

	w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);

	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_write(di->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);

	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

	w1_ds2760_recall_eeprom(di->dev, DS2760_EEPROM_BLOCK1);

	/* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS

	 * value won't be read back by ds2760_battery_read_status() */

	POWER_SUPPLY_PROP_CAPACITY,

};

static int ds2760_battery_probe(struct platform_device *pdev)

static int ds2760_pm_notifier(struct notifier_block *notifier,

			      unsigned long pm_event,

			      void *unused)

{

	struct ds2760_device_info *di =

		container_of(notifier, struct ds2760_device_info, pm_notifier);

	switch (pm_event) {

	case PM_HIBERNATION_PREPARE:

	case PM_SUSPEND_PREPARE:

		di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

		break;

	case PM_POST_RESTORE:

	case PM_POST_HIBERNATION:

	case PM_POST_SUSPEND:

		di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

		power_supply_changed(di->bat);

		mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);

		break;

	case PM_RESTORE_PREPARE:

	default:

		break;

	}

	return NOTIFY_DONE;

}

static int w1_ds2760_add_slave(struct w1_slave *sl)

{

	struct power_supply_config psy_cfg = {};

	char status;

	int retval = 0;

	struct ds2760_device_info *di;

	struct device *dev = &sl->dev;

	int retval = 0;

	char name[32];

	char status;

	di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);

	di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);

	if (!di) {

		retval = -ENOMEM;

		goto di_alloc_failed;

	}

	platform_set_drvdata(pdev, di);

	snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);

	di->dev				= &pdev->dev;

	di->w1_dev			= pdev->dev.parent;

	di->bat_desc.name		= dev_name(&pdev->dev);

	di->dev				= dev;

	di->bat_desc.name		= name;

	di->bat_desc.type		= POWER_SUPPLY_TYPE_BATTERY;

	di->bat_desc.properties		= ds2760_battery_props;

	di->bat_desc.num_properties	= ARRAY_SIZE(ds2760_battery_props);

	psy_cfg.drv_data = di;

	if (dev->of_node) {

		u32 tmp;

		psy_cfg.of_node = dev->of_node;

		if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled"))

			pmod_enabled = true;

		if (!of_property_read_u32(dev->of_node,

					  "maxim,cache-time-ms", &tmp))

			cache_time = tmp;

		if (!of_property_read_u32(dev->of_node,

					  "rated-capacity-microamp-hours",

					  &tmp))

			rated_capacity = tmp / 10; /* property is in mAh */

	}

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

	sl->family_data = di;

	/* enable sleep mode feature */

	ds2760_battery_read_status(di);

	status = di->raw[DS2760_STATUS_REG];

	ds2760_battery_write_status(di, status);

	/* set rated capacity from module param */

	/* set rated capacity from module param or device tree */

	if (rated_capacity)

		ds2760_battery_write_rated_capacity(di, rated_capacity);

	if (current_accum)

		ds2760_battery_set_current_accum(di, current_accum);

	di->bat = power_supply_register(&pdev->dev, &di->bat_desc, &psy_cfg);

	di->bat = power_supply_register(dev, &di->bat_desc, &psy_cfg);

	if (IS_ERR(di->bat)) {

		dev_err(di->dev, "failed to register battery\n");

		retval = PTR_ERR(di->bat);

	INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);

	INIT_DELAYED_WORK(&di->set_charged_work,

			  ds2760_battery_set_charged_work);

	di->monitor_wqueue = alloc_ordered_workqueue(dev_name(&pdev->dev),

						     WQ_MEM_RECLAIM);

	di->monitor_wqueue = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);

	if (!di->monitor_wqueue) {

		retval = -ESRCH;

		goto workqueue_failed;

	}

	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);

	di->pm_notifier.notifier_call = ds2760_pm_notifier;

	register_pm_notifier(&di->pm_notifier);

	goto success;

workqueue_failed:

	return retval;

}

static int ds2760_battery_remove(struct platform_device *pdev)

static void w1_ds2760_remove_slave(struct w1_slave *sl)

{

	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	struct ds2760_device_info *di = sl->family_data;

	unregister_pm_notifier(&di->pm_notifier);

	cancel_delayed_work_sync(&di->monitor_work);

	cancel_delayed_work_sync(&di->set_charged_work);

	destroy_workqueue(di->monitor_wqueue);

	power_supply_unregister(di->bat);

	return 0;

}

#ifdef CONFIG_PM

static int ds2760_battery_suspend(struct platform_device *pdev,

				  pm_message_t state)

{

	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

	return 0;

}

static int ds2760_battery_resume(struct platform_device *pdev)

{

	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

	power_supply_changed(di->bat);

	mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);

	return 0;

}

#else

#define ds2760_battery_suspend NULL

#define ds2760_battery_resume NULL

#endif /* CONFIG_PM */

MODULE_ALIAS("platform:ds2760-battery");

#ifdef CONFIG_OF

static const struct of_device_id w1_ds2760_of_ids[] = {

	{ .compatible = "maxim,ds2760" },

	{}

};

#endif

static struct platform_driver ds2760_battery_driver = {

	.driver = {

		.name = "ds2760-battery",

	},

	.probe	  = ds2760_battery_probe,

	.remove   = ds2760_battery_remove,

	.suspend  = ds2760_battery_suspend,

	.resume	  = ds2760_battery_resume,

static struct w1_family_ops w1_ds2760_fops = {

	.add_slave	= w1_ds2760_add_slave,

	.remove_slave	= w1_ds2760_remove_slave,

	.groups		= w1_ds2760_groups,

};

module_platform_driver(ds2760_battery_driver);

static struct w1_family w1_ds2760_family = {

	.fid		= W1_FAMILY_DS2760,

	.fops		= &w1_ds2760_fops,

	.of_match_table	= of_match_ptr(w1_ds2760_of_ids),

};

module_w1_family(w1_ds2760_family);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "

	      "Matt Reimer <mreimer@vpop.net>, "

	      "Anton Vorontsov <cbou@mail.ru>");

MODULE_DESCRIPTION("ds2760 battery driver");

MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");

MODULE_LICENSE("GPL");

MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));