power_supply: Add charger driver for MAX8997/8966

MAX8997/8966 chip is a multi-function device which includes PMIC, RTC, Fuel Gauge, MUIC, Haptic, Flash control, and Battery charging control. The driver for it is located at drivers/mfd. This patch supports battery charging control of MAX8997/8966 chip and provides power supply class information to userspace. Signed-off-by: Donggeun Kim <dg77.kim@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: KyungMin Park <kyungmin.park@samsung.com> Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

power_supply: Add charger driver for MAX8997/8966
MAX8997/8966 chip is a multi-function device which includes PMIC, RTC, Fuel Gauge, MUIC, Haptic, Flash control, and Battery charging control. The driver for it is located at drivers/mfd. This patch supports battery charging control of MAX8997/8966 chip and provides power supply class information to userspace. Signed-off-by: Donggeun Kim <dg77.kim@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: KyungMin Park <kyungmin.park@samsung.com> Acked-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Donggeun Kim · Anton Vorontsov
1 parent 7c4509b4cd
Showing 4 changed files with 220 additions and 1 deletions Side-by-side Diff
drivers/power/Kconfig
drivers/power/Makefile
drivers/power/max8997_charger.c
include/linux/mfd/max8997.h
@@ -228,5 +228,12 @@
 	  This driver can be build as a module. If so, the module will be
 	  called gpio-charger.
  
+config CHARGER_MAX8997
+	tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
+	depends on MFD_MAX8997 && REGULATOR_MAX8997
+	help
+	  Say Y to enable support for the battery charger control sysfs and
+	  platform data of MAX8997/LP3974 PMICs.
+
 endif # POWER_SUPPLY
@@ -35,4 +35,5 @@
 obj-$(CONFIG_CHARGER_MAX8903)	+= max8903_charger.o
 obj-$(CONFIG_CHARGER_TWL4030)	+= twl4030_charger.o
 obj-$(CONFIG_CHARGER_GPIO)	+= gpio-charger.o
+obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
+/*
+ * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
+ *
+ *  Copyright (C) 2011 Samsung Electronics
+ *  MyungJoo Ham <myungjoo.ham@samsung.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+
+struct charger_data {
+	struct device *dev;
+	struct max8997_dev *iodev;
+	struct power_supply battery;
+};
+
+static enum power_supply_property max8997_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
+	POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
+	POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
+};
+
+/* Note that the charger control is done by a current regulator "CHARGER" */
+static int max8997_battery_get_property(struct power_supply *psy,
+		enum power_supply_property psp,
+		union power_supply_propval *val)
+{
+	struct charger_data *charger = container_of(psy,
+			struct charger_data, battery);
+	struct i2c_client *i2c = charger->iodev->i2c;
+	int ret;
+	u8 reg;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = 0;
+		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+		if (ret)
+			return ret;
+		if ((reg & (1 << 0)) == 0x1)
+			val->intval = POWER_SUPPLY_STATUS_FULL;
+
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = 0;
+		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+		if (ret)
+			return ret;
+		if ((reg & (1 << 2)) == 0x0)
+			val->intval = 1;
+
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = 0;
+		ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
+		if (ret)
+			return ret;
+		/* DCINOK */
+		if (reg & (1 << 1))
+			val->intval = 1;
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static __devinit int max8997_battery_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct charger_data *charger;
+	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+
+	if (!pdata)
+		return -EINVAL;
+
+	if (pdata->eoc_mA) {
+		u8 val = (pdata->eoc_mA - 50) / 10;
+		if (val < 0)
+			val = 0;
+		if (val > 0xf)
+			val = 0xf;
+
+		ret = max8997_update_reg(iodev->i2c,
+				MAX8997_REG_MBCCTRL5, val, 0xf);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+			return ret;
+		}
+	}
+
+	switch (pdata->timeout) {
+	case 5:
+		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+				0x2 << 4, 0x7 << 4);
+		break;
+	case 6:
+		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+				0x3 << 4, 0x7 << 4);
+		break;
+	case 7:
+		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+				0x4 << 4, 0x7 << 4);
+		break;
+	case 0:
+		ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
+				0x7 << 4, 0x7 << 4);
+		break;
+	default:
+		dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
+				pdata->timeout);
+		return -EINVAL;
+	}
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Cannot use i2c bus.\n");
+		return ret;
+	}
+
+	charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
+	if (charger == NULL) {
+		dev_err(&pdev->dev, "Cannot allocate memory.\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, charger);
+
+	charger->battery.name = "max8997_pmic";
+	charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+	charger->battery.get_property = max8997_battery_get_property;
+	charger->battery.properties = max8997_battery_props;
+	charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
+
+	charger->dev = &pdev->dev;
+	charger->iodev = iodev;
+
+	ret = power_supply_register(&pdev->dev, &charger->battery);
+	if (ret) {
+		dev_err(&pdev->dev, "failed: power supply register\n");
+		goto err;
+	}
+
+	return 0;
+err:
+	kfree(charger);
+	return ret;
+}
+
+static int __devexit max8997_battery_remove(struct platform_device *pdev)
+{
+	struct charger_data *charger = platform_get_drvdata(pdev);
+
+	power_supply_unregister(&charger->battery);
+	kfree(charger);
+	return 0;
+}
+
+static const struct platform_device_id max8997_battery_id[] = {
+	{ "max8997-battery", 0 },
+};
+
+static struct platform_driver max8997_battery_driver = {
+	.driver = {
+		.name = "max8997-battery",
+		.owner = THIS_MODULE,
+	},
+	.probe = max8997_battery_probe,
+	.remove = __devexit_p(max8997_battery_remove),
+	.id_table = max8997_battery_id,
+};
+
+static int __init max8997_battery_init(void)
+{
+	return platform_driver_register(&max8997_battery_driver);
+}
+subsys_initcall(max8997_battery_init);
+
+static void __exit max8997_battery_cleanup(void)
+{
+	platform_driver_unregister(&max8997_battery_driver);
+}
+module_exit(max8997_battery_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_LICENSE("GPL");
@@ -107,11 +107,16 @@
 	unsigned int buck5_voltage[8];
 	bool buck5_gpiodvs;
  
+	/* ---- Charger control ---- */
+	/* eoc stands for 'end of charge' */
+	int eoc_mA; /* 50 ~ 200mA by 10mA step */
+	/* charge Full Timeout */
+	int timeout; /* 0 (no timeout), 5, 6, 7 hours */
+
 	/* MUIC: Not implemented */
 	/* HAPTIC: Not implemented */
 	/* RTC: Not implemented */
 	/* Flash: Not implemented */
-	/* Charger control: Not implemented */
 };
  
 #endif /* __LINUX_MFD_MAX8998_H */
...	...	@@ -228,5 +228,12 @@
228	228	This driver can be build as a module. If so, the module will be
229	229	called gpio-charger.
230	230
	231	+config CHARGER_MAX8997
	232	+ tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
	233	+ depends on MFD_MAX8997 && REGULATOR_MAX8997
	234	+ help
	235	+ Say Y to enable support for the battery charger control sysfs and
	236	+ platform data of MAX8997/LP3974 PMICs.
	237	+
231	238	endif # POWER_SUPPLY
...	...	@@ -35,4 +35,5 @@
35	35	obj-$(CONFIG_CHARGER_MAX8903) += max8903_charger.o
36	36	obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
37	37	obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
	38	+obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
	1	+/*
	2	+ * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
	3	+ *
	4	+ * Copyright (C) 2011 Samsung Electronics
	5	+ * MyungJoo Ham <myungjoo.ham@samsung.com>
	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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	+ */
	21	+
	22	+#include <linux/err.h>
	23	+#include <linux/slab.h>
	24	+#include <linux/platform_device.h>
	25	+#include <linux/power_supply.h>
	26	+#include <linux/mfd/max8997.h>
	27	+#include <linux/mfd/max8997-private.h>
	28	+
	29	+struct charger_data {
	30	+ struct device *dev;
	31	+ struct max8997_dev *iodev;
	32	+ struct power_supply battery;
	33	+};
	34	+
	35	+static enum power_supply_property max8997_battery_props[] = {
	36	+ POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
	37	+ POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
	38	+ POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
	39	+};
	40	+
	41	+/* Note that the charger control is done by a current regulator "CHARGER" */
	42	+static int max8997_battery_get_property(struct power_supply *psy,
	43	+ enum power_supply_property psp,
	44	+ union power_supply_propval *val)
	45	+{
	46	+ struct charger_data *charger = container_of(psy,
	47	+ struct charger_data, battery);
	48	+ struct i2c_client *i2c = charger->iodev->i2c;
	49	+ int ret;
	50	+ u8 reg;
	51	+
	52	+ switch (psp) {
	53	+ case POWER_SUPPLY_PROP_STATUS:
	54	+ val->intval = 0;
	55	+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	56	+ if (ret)
	57	+ return ret;
	58	+ if ((reg & (1 << 0)) == 0x1)
	59	+ val->intval = POWER_SUPPLY_STATUS_FULL;
	60	+
	61	+ break;
	62	+ case POWER_SUPPLY_PROP_PRESENT:
	63	+ val->intval = 0;
	64	+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	65	+ if (ret)
	66	+ return ret;
	67	+ if ((reg & (1 << 2)) == 0x0)
	68	+ val->intval = 1;
	69	+
	70	+ break;
	71	+ case POWER_SUPPLY_PROP_ONLINE:
	72	+ val->intval = 0;
	73	+ ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
	74	+ if (ret)
	75	+ return ret;
	76	+ /* DCINOK */
	77	+ if (reg & (1 << 1))
	78	+ val->intval = 1;
	79	+
	80	+ break;
	81	+ default:
	82	+ return -EINVAL;
	83	+ }
	84	+
	85	+ return 0;
	86	+}
	87	+
	88	+static __devinit int max8997_battery_probe(struct platform_device *pdev)
	89	+{
	90	+ int ret = 0;
	91	+ struct charger_data *charger;
	92	+ struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	93	+ struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
	94	+
	95	+ if (!pdata)
	96	+ return -EINVAL;
	97	+
	98	+ if (pdata->eoc_mA) {
	99	+ u8 val = (pdata->eoc_mA - 50) / 10;
	100	+ if (val < 0)
	101	+ val = 0;
	102	+ if (val > 0xf)
	103	+ val = 0xf;
	104	+
	105	+ ret = max8997_update_reg(iodev->i2c,
	106	+ MAX8997_REG_MBCCTRL5, val, 0xf);
	107	+ if (ret < 0) {
	108	+ dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	109	+ return ret;
	110	+ }
	111	+ }
	112	+
	113	+ switch (pdata->timeout) {
	114	+ case 5:
	115	+ ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	116	+ 0x2 << 4, 0x7 << 4);
	117	+ break;
	118	+ case 6:
	119	+ ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	120	+ 0x3 << 4, 0x7 << 4);
	121	+ break;
	122	+ case 7:
	123	+ ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	124	+ 0x4 << 4, 0x7 << 4);
	125	+ break;
	126	+ case 0:
	127	+ ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
	128	+ 0x7 << 4, 0x7 << 4);
	129	+ break;
	130	+ default:
	131	+ dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
	132	+ pdata->timeout);
	133	+ return -EINVAL;
	134	+ }
	135	+ if (ret < 0) {
	136	+ dev_err(&pdev->dev, "Cannot use i2c bus.\n");
	137	+ return ret;
	138	+ }
	139	+
	140	+ charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
	141	+ if (charger == NULL) {
	142	+ dev_err(&pdev->dev, "Cannot allocate memory.\n");
	143	+ return -ENOMEM;
	144	+ }
	145	+
	146	+ platform_set_drvdata(pdev, charger);
	147	+
	148	+ charger->battery.name = "max8997_pmic";
	149	+ charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	150	+ charger->battery.get_property = max8997_battery_get_property;
	151	+ charger->battery.properties = max8997_battery_props;
	152	+ charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
	153	+
	154	+ charger->dev = &pdev->dev;
	155	+ charger->iodev = iodev;
	156	+
	157	+ ret = power_supply_register(&pdev->dev, &charger->battery);
	158	+ if (ret) {
	159	+ dev_err(&pdev->dev, "failed: power supply register\n");
	160	+ goto err;
	161	+ }
	162	+
	163	+ return 0;
	164	+err:
	165	+ kfree(charger);
	166	+ return ret;
	167	+}
	168	+
	169	+static int __devexit max8997_battery_remove(struct platform_device *pdev)
	170	+{
	171	+ struct charger_data *charger = platform_get_drvdata(pdev);
	172	+
	173	+ power_supply_unregister(&charger->battery);
	174	+ kfree(charger);
	175	+ return 0;
	176	+}
	177	+
	178	+static const struct platform_device_id max8997_battery_id[] = {
	179	+ { "max8997-battery", 0 },
	180	+};
	181	+
	182	+static struct platform_driver max8997_battery_driver = {
	183	+ .driver = {
	184	+ .name = "max8997-battery",
	185	+ .owner = THIS_MODULE,
	186	+ },
	187	+ .probe = max8997_battery_probe,
	188	+ .remove = __devexit_p(max8997_battery_remove),
	189	+ .id_table = max8997_battery_id,
	190	+};
	191	+
	192	+static int __init max8997_battery_init(void)
	193	+{
	194	+ return platform_driver_register(&max8997_battery_driver);
	195	+}
	196	+subsys_initcall(max8997_battery_init);
	197	+
	198	+static void __exit max8997_battery_cleanup(void)
	199	+{
	200	+ platform_driver_unregister(&max8997_battery_driver);
	201	+}
	202	+module_exit(max8997_battery_cleanup);
	203	+
	204	+MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
	205	+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	206	+MODULE_LICENSE("GPL");
...	...	@@ -107,11 +107,16 @@
107	107	unsigned int buck5_voltage[8];
108	108	bool buck5_gpiodvs;
109	109
	110	+ /* ---- Charger control ---- */
	111	+ /* eoc stands for 'end of charge' */
	112	+ int eoc_mA; /* 50 ~ 200mA by 10mA step */
	113	+ /* charge Full Timeout */
	114	+ int timeout; /* 0 (no timeout), 5, 6, 7 hours */
	115	+
110	116	/* MUIC: Not implemented */
111	117	/* HAPTIC: Not implemented */
112	118	/* RTC: Not implemented */
113	119	/* Flash: Not implemented */
114		- /* Charger control: Not implemented */
115	120	};
116	121
117	122	#endif /* __LINUX_MFD_MAX8998_H */