max8998_charger.c

  1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
  4//
  5//  Copyright (C) 2009-2010 Samsung Electronics
  6//  MyungJoo Ham <myungjoo.ham@samsung.com>
  7
  8#include <linux/err.h>
  9#include <linux/module.h>
 10#include <linux/mod_devicetable.h>
 11#include <linux/slab.h>
 12#include <linux/platform_device.h>
 13#include <linux/power_supply.h>
 14#include <linux/mfd/max8998.h>
 15#include <linux/mfd/max8998-private.h>
 16
 17struct max8998_battery_data {
 18	struct device *dev;
 19	struct max8998_dev *iodev;
 20	struct power_supply *battery;
 21};
 22
 23static enum power_supply_property max8998_battery_props[] = {
 24	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
 25	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
 26	POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */
 27};
 28
 29/* Note that the charger control is done by a current regulator "CHARGER" */
 30static int max8998_battery_get_property(struct power_supply *psy,
 31		enum power_supply_property psp,
 32		union power_supply_propval *val)
 33{
 34	struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy);
 35	struct i2c_client *i2c = max8998->iodev->i2c;
 36	int ret;
 37	u8 reg;
 38
 39	switch (psp) {
 40	case POWER_SUPPLY_PROP_PRESENT:
 41		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
 42		if (ret)
 43			return ret;
 44		if (reg & (1 << 4))
 45			val->intval = 0;
 46		else
 47			val->intval = 1;
 48		break;
 49	case POWER_SUPPLY_PROP_ONLINE:
 50		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
 51		if (ret)
 52			return ret;
 53
 54		if (reg & (1 << 5))
 55			val->intval = 1;
 56		else
 57			val->intval = 0;
 58
 59		break;
 60	case POWER_SUPPLY_PROP_STATUS:
 61		ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
 62		if (ret)
 63			return ret;
 64
 65		if (!(reg & (1 << 5))) {
 66			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 67		} else {
 68			if (reg & (1 << 6))
 69				val->intval = POWER_SUPPLY_STATUS_FULL;
 70			else if (reg & (1 << 3))
 71				val->intval = POWER_SUPPLY_STATUS_CHARGING;
 72			else
 73				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 74		}
 75		break;
 76	default:
 77		return -EINVAL;
 78	}
 79
 80	return 0;
 81}
 82
 83static const struct power_supply_desc max8998_battery_desc = {
 84	.name		= "max8998_pmic",
 85	.type		= POWER_SUPPLY_TYPE_BATTERY,
 86	.get_property	= max8998_battery_get_property,
 87	.properties	= max8998_battery_props,
 88	.num_properties	= ARRAY_SIZE(max8998_battery_props),
 89};
 90
 91static int max8998_battery_probe(struct platform_device *pdev)
 92{
 93	struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 94	struct max8998_platform_data *pdata = iodev->pdata;
 95	struct power_supply_config psy_cfg = {};
 96	struct max8998_battery_data *max8998;
 97	struct i2c_client *i2c;
 98	int ret = 0;
 99
100	if (!pdata) {
101		dev_err(pdev->dev.parent, "No platform init data supplied\n");
102		return -ENODEV;
103	}
104
105	max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
106				GFP_KERNEL);
107	if (!max8998)
108		return -ENOMEM;
109
110	max8998->dev = &pdev->dev;
111	max8998->iodev = iodev;
112	platform_set_drvdata(pdev, max8998);
113	i2c = max8998->iodev->i2c;
114
115	/* Setup "End of Charge" */
116	/* If EOC value equals 0,
117	 * remain value set from bootloader or default value */
118	if (pdata->eoc >= 10 && pdata->eoc <= 45) {
119		max8998_update_reg(i2c, MAX8998_REG_CHGR1,
120				(pdata->eoc / 5 - 2) << 5, 0x7 << 5);
121	} else if (pdata->eoc == 0) {
122		dev_dbg(max8998->dev,
123			"EOC value not set: leave it unchanged.\n");
124	} else {
125		dev_err(max8998->dev, "Invalid EOC value\n");
126		return -EINVAL;
127	}
128
129	/* Setup Charge Restart Level */
130	switch (pdata->restart) {
131	case 100:
132		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
133		break;
134	case 150:
135		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
136		break;
137	case 200:
138		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
139		break;
140	case -1:
141		max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
142		break;
143	case 0:
144		dev_dbg(max8998->dev,
145			"Restart Level not set: leave it unchanged.\n");
146		break;
147	default:
148		dev_err(max8998->dev, "Invalid Restart Level\n");
149		return -EINVAL;
150	}
151
152	/* Setup Charge Full Timeout */
153	switch (pdata->timeout) {
154	case 5:
155		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
156		break;
157	case 6:
158		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
159		break;
160	case 7:
161		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
162		break;
163	case -1:
164		max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
165		break;
166	case 0:
167		dev_dbg(max8998->dev,
168			"Full Timeout not set: leave it unchanged.\n");
169		break;
170	default:
171		dev_err(max8998->dev, "Invalid Full Timeout value\n");
172		return -EINVAL;
173	}
174
175	psy_cfg.drv_data = max8998;
176
177	max8998->battery = devm_power_supply_register(max8998->dev,
178						      &max8998_battery_desc,
179						      &psy_cfg);
180	if (IS_ERR(max8998->battery)) {
181		ret = PTR_ERR(max8998->battery);
182		dev_err(max8998->dev, "failed: power supply register: %d\n",
183			ret);
184		return ret;
185	}
186
187	return 0;
188}
189
190static const struct platform_device_id max8998_battery_id[] = {
191	{ "max8998-battery", TYPE_MAX8998 },
192	{ }
193};
194MODULE_DEVICE_TABLE(platform, max8998_battery_id);
195
196static struct platform_driver max8998_battery_driver = {
197	.driver = {
198		.name = "max8998-battery",
199	},
200	.probe = max8998_battery_probe,
201	.id_table = max8998_battery_id,
202};
203
204module_platform_driver(max8998_battery_driver);
205
206MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
207MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
208MODULE_LICENSE("GPL");
209MODULE_ALIAS("platform:max8998-battery");