power_supply: Add driver for MAX8903 charger
authorMyungJoo Ham <myungjoo.ham@samsung.com>
Tue, 29 Mar 2011 01:10:16 +0000 (10:10 +0900)
committerAnton Vorontsov <cbouatmailru@gmail.com>
Wed, 20 Apr 2011 13:48:48 +0000 (17:48 +0400)
MAX8903 is an integrated battery charger and selector with two
power inputs (USB and AC adapter). This driver enables the charger,
handles interrupts, and provides power-supply-class information to
userland.

Tested on Exynos4 NURI / S5PC210 SLP7 boards.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
drivers/power/Kconfig
drivers/power/Makefile
drivers/power/max8903_charger.c [new file with mode: 0644]
include/linux/power/max8903_charger.h [new file with mode: 0644]

index 52a462fc6b84467f3aafca8d09cf5630b7d500bd..1f50ebcc63992d1ec73f957336cb6940a075e33f 100644 (file)
@@ -203,6 +203,14 @@ config CHARGER_ISP1704
          Say Y to enable support for USB Charger Detection with
          ISP1707/ISP1704 USB transceivers.
 
+config CHARGER_MAX8903
+       tristate "MAX8903 Battery DC-DC Charger for USB and Adapter Power"
+       help
+         Say Y to enable support for the MAX8903 DC-DC charger and sysfs.
+         The driver supports controlling charger-enable and current-limit
+         pins based on the status of charger connections with interrupt
+         handlers.
+
 config CHARGER_TWL4030
        tristate "OMAP TWL4030 BCI charger driver"
        depends on TWL4030_CORE
index 8385bfae872836bf367e937b1f627cbe82c39421..8fcd93ff2353a8a44f6ce6ef228c93e07d5b0ccc 100644 (file)
@@ -32,5 +32,6 @@ obj-$(CONFIG_CHARGER_PCF50633)        += pcf50633-charger.o
 obj-$(CONFIG_BATTERY_JZ4740)   += jz4740-battery.o
 obj-$(CONFIG_BATTERY_INTEL_MID)        += intel_mid_battery.o
 obj-$(CONFIG_CHARGER_ISP1704)  += isp1704_charger.o
+obj-$(CONFIG_CHARGER_MAX8903)  += max8903_charger.o
 obj-$(CONFIG_CHARGER_TWL4030)  += twl4030_charger.o
 obj-$(CONFIG_CHARGER_GPIO)     += gpio-charger.o
diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
new file mode 100644 (file)
index 0000000..33ff0e3
--- /dev/null
@@ -0,0 +1,391 @@
+/*
+ * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
+ *
+ * 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/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/power_supply.h>
+#include <linux/platform_device.h>
+#include <linux/power/max8903_charger.h>
+
+struct max8903_data {
+       struct max8903_pdata *pdata;
+       struct device *dev;
+       struct power_supply psy;
+       bool fault;
+       bool usb_in;
+       bool ta_in;
+};
+
+static enum power_supply_property max8903_charger_props[] = {
+       POWER_SUPPLY_PROP_STATUS, /* Charger status output */
+       POWER_SUPPLY_PROP_ONLINE, /* External power source */
+       POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
+};
+
+static int max8903_get_property(struct power_supply *psy,
+               enum power_supply_property psp,
+               union power_supply_propval *val)
+{
+       struct max8903_data *data = container_of(psy,
+                       struct max8903_data, psy);
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_STATUS:
+               val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+               if (data->pdata->chg) {
+                       if (gpio_get_value(data->pdata->chg) == 0)
+                               val->intval = POWER_SUPPLY_STATUS_CHARGING;
+                       else if (data->usb_in || data->ta_in)
+                               val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+                       else
+                               val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+               }
+               break;
+       case POWER_SUPPLY_PROP_ONLINE:
+               val->intval = 0;
+               if (data->usb_in || data->ta_in)
+                       val->intval = 1;
+               break;
+       case POWER_SUPPLY_PROP_HEALTH:
+               val->intval = POWER_SUPPLY_HEALTH_GOOD;
+               if (data->fault)
+                       val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+               break;
+       default:
+               return -EINVAL;
+       }
+       return 0;
+}
+
+static irqreturn_t max8903_dcin(int irq, void *_data)
+{
+       struct max8903_data *data = _data;
+       struct max8903_pdata *pdata = data->pdata;
+       bool ta_in;
+       enum power_supply_type old_type;
+
+       ta_in = gpio_get_value(pdata->dok) ? false : true;
+
+       if (ta_in == data->ta_in)
+               return IRQ_HANDLED;
+
+       data->ta_in = ta_in;
+
+       /* Set Current-Limit-Mode 1:DC 0:USB */
+       if (pdata->dcm)
+               gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
+
+       /* Charger Enable / Disable (cen is negated) */
+       if (pdata->cen)
+               gpio_set_value(pdata->cen, ta_in ? 0 :
+                               (data->usb_in ? 0 : 1));
+
+       dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
+                       "Connected" : "Disconnected");
+
+       old_type = data->psy.type;
+
+       if (data->ta_in)
+               data->psy.type = POWER_SUPPLY_TYPE_MAINS;
+       else if (data->usb_in)
+               data->psy.type = POWER_SUPPLY_TYPE_USB;
+       else
+               data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
+
+       if (old_type != data->psy.type)
+               power_supply_changed(&data->psy);
+
+       return IRQ_HANDLED;
+}
+
+static irqreturn_t max8903_usbin(int irq, void *_data)
+{
+       struct max8903_data *data = _data;
+       struct max8903_pdata *pdata = data->pdata;
+       bool usb_in;
+       enum power_supply_type old_type;
+
+       usb_in = gpio_get_value(pdata->uok) ? false : true;
+
+       if (usb_in == data->usb_in)
+               return IRQ_HANDLED;
+
+       data->usb_in = usb_in;
+
+       /* Do not touch Current-Limit-Mode */
+
+       /* Charger Enable / Disable (cen is negated) */
+       if (pdata->cen)
+               gpio_set_value(pdata->cen, usb_in ? 0 :
+                               (data->ta_in ? 0 : 1));
+
+       dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
+                       "Connected" : "Disconnected");
+
+       old_type = data->psy.type;
+
+       if (data->ta_in)
+               data->psy.type = POWER_SUPPLY_TYPE_MAINS;
+       else if (data->usb_in)
+               data->psy.type = POWER_SUPPLY_TYPE_USB;
+       else
+               data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
+
+       if (old_type != data->psy.type)
+               power_supply_changed(&data->psy);
+
+       return IRQ_HANDLED;
+}
+
+static irqreturn_t max8903_fault(int irq, void *_data)
+{
+       struct max8903_data *data = _data;
+       struct max8903_pdata *pdata = data->pdata;
+       bool fault;
+
+       fault = gpio_get_value(pdata->flt) ? false : true;
+
+       if (fault == data->fault)
+               return IRQ_HANDLED;
+
+       data->fault = fault;
+
+       if (fault)
+               dev_err(data->dev, "Charger suffers a fault and stops.\n");
+       else
+               dev_err(data->dev, "Charger recovered from a fault.\n");
+
+       return IRQ_HANDLED;
+}
+
+static __devinit int max8903_probe(struct platform_device *pdev)
+{
+       struct max8903_data *data;
+       struct device *dev = &pdev->dev;
+       struct max8903_pdata *pdata = pdev->dev.platform_data;
+       int ret = 0;
+       int gpio;
+       int ta_in = 0;
+       int usb_in = 0;
+
+       data = kzalloc(sizeof(struct max8903_data), GFP_KERNEL);
+       if (data == NULL) {
+               dev_err(dev, "Cannot allocate memory.\n");
+               return -ENOMEM;
+       }
+       data->pdata = pdata;
+       data->dev = dev;
+       platform_set_drvdata(pdev, data);
+
+       if (pdata->dc_valid == false && pdata->usb_valid == false) {
+               dev_err(dev, "No valid power sources.\n");
+               ret = -EINVAL;
+               goto err;
+       }
+
+       if (pdata->dc_valid) {
+               if (pdata->dok && gpio_is_valid(pdata->dok) &&
+                               pdata->dcm && gpio_is_valid(pdata->dcm)) {
+                       gpio = pdata->dok; /* PULL_UPed Interrupt */
+                       ta_in = gpio_get_value(gpio) ? 0 : 1;
+
+                       gpio = pdata->dcm; /* Output */
+                       gpio_set_value(gpio, ta_in);
+               } else {
+                       dev_err(dev, "When DC is wired, DOK and DCM should"
+                                       " be wired as well.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       } else {
+               if (pdata->dcm) {
+                       if (gpio_is_valid(pdata->dcm))
+                               gpio_set_value(pdata->dcm, 0);
+                       else {
+                               dev_err(dev, "Invalid pin: dcm.\n");
+                               ret = -EINVAL;
+                               goto err;
+                       }
+               }
+       }
+
+       if (pdata->usb_valid) {
+               if (pdata->uok && gpio_is_valid(pdata->uok)) {
+                       gpio = pdata->uok;
+                       usb_in = gpio_get_value(gpio) ? 0 : 1;
+               } else {
+                       dev_err(dev, "When USB is wired, UOK should be wired."
+                                       "as well.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       }
+
+       if (pdata->cen) {
+               if (gpio_is_valid(pdata->cen)) {
+                       gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
+               } else {
+                       dev_err(dev, "Invalid pin: cen.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       }
+
+       if (pdata->chg) {
+               if (!gpio_is_valid(pdata->chg)) {
+                       dev_err(dev, "Invalid pin: chg.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       }
+
+       if (pdata->flt) {
+               if (!gpio_is_valid(pdata->flt)) {
+                       dev_err(dev, "Invalid pin: flt.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       }
+
+       if (pdata->usus) {
+               if (!gpio_is_valid(pdata->usus)) {
+                       dev_err(dev, "Invalid pin: usus.\n");
+                       ret = -EINVAL;
+                       goto err;
+               }
+       }
+
+       data->fault = false;
+       data->ta_in = ta_in;
+       data->usb_in = usb_in;
+
+       data->psy.name = "max8903_charger";
+       data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
+                       ((usb_in) ? POWER_SUPPLY_TYPE_USB :
+                        POWER_SUPPLY_TYPE_BATTERY);
+       data->psy.get_property = max8903_get_property;
+       data->psy.properties = max8903_charger_props;
+       data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
+
+       ret = power_supply_register(dev, &data->psy);
+       if (ret) {
+               dev_err(dev, "failed: power supply register.\n");
+               goto err;
+       }
+
+       if (pdata->dc_valid) {
+               ret = request_threaded_irq(gpio_to_irq(pdata->dok),
+                               NULL, max8903_dcin,
+                               IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                               "MAX8903 DC IN", data);
+               if (ret) {
+                       dev_err(dev, "Cannot request irq %d for DC (%d)\n",
+                                       gpio_to_irq(pdata->dok), ret);
+                       goto err_psy;
+               }
+       }
+
+       if (pdata->usb_valid) {
+               ret = request_threaded_irq(gpio_to_irq(pdata->uok),
+                               NULL, max8903_usbin,
+                               IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                               "MAX8903 USB IN", data);
+               if (ret) {
+                       dev_err(dev, "Cannot request irq %d for USB (%d)\n",
+                                       gpio_to_irq(pdata->uok), ret);
+                       goto err_dc_irq;
+               }
+       }
+
+       if (pdata->flt) {
+               ret = request_threaded_irq(gpio_to_irq(pdata->flt),
+                               NULL, max8903_fault,
+                               IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+                               "MAX8903 Fault", data);
+               if (ret) {
+                       dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
+                                       gpio_to_irq(pdata->flt), ret);
+                       goto err_usb_irq;
+               }
+       }
+
+       return 0;
+
+err_usb_irq:
+       if (pdata->usb_valid)
+               free_irq(gpio_to_irq(pdata->uok), data);
+err_dc_irq:
+       if (pdata->dc_valid)
+               free_irq(gpio_to_irq(pdata->dok), data);
+err_psy:
+       power_supply_unregister(&data->psy);
+err:
+       kfree(data);
+       return ret;
+}
+
+static __devexit int max8903_remove(struct platform_device *pdev)
+{
+       struct max8903_data *data = platform_get_drvdata(pdev);
+
+       if (data) {
+               struct max8903_pdata *pdata = data->pdata;
+
+               if (pdata->flt)
+                       free_irq(gpio_to_irq(pdata->flt), data);
+               if (pdata->usb_valid)
+                       free_irq(gpio_to_irq(pdata->uok), data);
+               if (pdata->dc_valid)
+                       free_irq(gpio_to_irq(pdata->dok), data);
+               power_supply_unregister(&data->psy);
+               kfree(data);
+       }
+
+       return 0;
+}
+
+static struct platform_driver max8903_driver = {
+       .probe  = max8903_probe,
+       .remove = __devexit_p(max8903_remove),
+       .driver = {
+               .name   = "max8903-charger",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init max8903_init(void)
+{
+       return platform_driver_register(&max8903_driver);
+}
+module_init(max8903_init);
+
+static void __exit max8903_exit(void)
+{
+       platform_driver_unregister(&max8903_driver);
+}
+module_exit(max8903_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MAX8903 Charger Driver");
+MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
+MODULE_ALIAS("max8903-charger");
diff --git a/include/linux/power/max8903_charger.h b/include/linux/power/max8903_charger.h
new file mode 100644 (file)
index 0000000..24f51db
--- /dev/null
@@ -0,0 +1,57 @@
+/*
+ * max8903_charger.h - Maxim 8903 USB/Adapter Charger Driver
+ *
+ * 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
+ *
+ */
+
+#ifndef __MAX8903_CHARGER_H__
+#define __MAX8903_CHARGER_H__
+
+struct max8903_pdata {
+       /*
+        * GPIOs
+        * cen, chg, flt, and usus are optional.
+        * dok, dcm, and uok are not optional depending on the status of
+        * dc_valid and usb_valid.
+        */
+       int cen;        /* Charger Enable input */
+       int dok;        /* DC(Adapter) Power OK output */
+       int uok;        /* USB Power OK output */
+       int chg;        /* Charger status output */
+       int flt;        /* Fault output */
+       int dcm;        /* Current-Limit Mode input (1: DC, 2: USB) */
+       int usus;       /* USB Suspend Input (1: suspended) */
+
+       /*
+        * DC(Adapter/TA) is wired
+        * When dc_valid is true,
+        *      dok and dcm should be valid.
+        *
+        * At least one of dc_valid or usb_valid should be true.
+        */
+       bool dc_valid;
+       /*
+        * USB is wired
+        * When usb_valid is true,
+        *      uok should be valid.
+        */
+       bool usb_valid;
+};
+
+#endif /* __MAX8903_CHARGER_H__ */