power_supply: Add LP8727 charger driver
Woogyom Kim [Wed, 4 Jan 2012 04:27:43 +0000 (08:27 +0400)]
National Semiconductor LP8727 is the battery charger with Micro/Mini
USB interface. This IC includes below functions:

- I2C interface for accessing user registers
- Single input Li-Ion battery charger
- Charger input ID detection from Micro/Mini USB
- Multiplexing switches on USB, UART

Signed-off-by: Woogyom Kim <milo.kim@ti.com>
Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>

drivers/power/Kconfig
drivers/power/Makefile
drivers/power/lp8727_charger.c [new file with mode: 0644]

index 363f4d1..ac807c4 100644 (file)
@@ -225,6 +225,12 @@ config CHARGER_TWL4030
        help
          Say Y here to enable support for TWL4030 Battery Charge Interface.
 
+config CHARGER_LP8727
+       tristate "National Semiconductor LP8727 charger driver"
+       depends on I2C
+       help
+         Say Y here to enable support for LP8727 Charger Driver.
+
 config CHARGER_GPIO
        tristate "GPIO charger"
        depends on GPIOLIB
index d3b24e9..9a78b1d 100644 (file)
@@ -35,6 +35,7 @@ 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-$(CONFIG_CHARGER_LP8727)   += lp8727_charger.o
 obj-$(CONFIG_CHARGER_GPIO)     += gpio-charger.o
 obj-$(CONFIG_CHARGER_MANAGER)  += charger-manager.o
 obj-$(CONFIG_CHARGER_MAX8997)  += max8997_charger.o
diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c
new file mode 100644 (file)
index 0000000..2a649e0
--- /dev/null
@@ -0,0 +1,491 @@
+/*
+ * Driver for LP8727 Micro/Mini USB IC with intergrated charger
+ *
+ *                     Copyright (C) 2011 National Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+#include <linux/lp8727.h>
+
+#define DEBOUNCE_MSEC  270
+
+/* Registers */
+#define CTRL1          0x1
+#define CTRL2          0x2
+#define        SWCTRL          0x3
+#define INT1           0x4
+#define INT2           0x5
+#define STATUS1                0x6
+#define STATUS2        0x7
+#define CHGCTRL2       0x9
+
+/* CTRL1 register */
+#define CP_EN          (1 << 0)
+#define ADC_EN         (1 << 1)
+#define ID200_EN       (1 << 4)
+
+/* CTRL2 register */
+#define CHGDET_EN      (1 << 1)
+#define INT_EN         (1 << 6)
+
+/* SWCTRL register */
+#define SW_DM1_DM      (0x0 << 0)
+#define SW_DM1_U1      (0x1 << 0)
+#define SW_DM1_HiZ     (0x7 << 0)
+#define SW_DP2_DP      (0x0 << 3)
+#define SW_DP2_U2      (0x1 << 3)
+#define SW_DP2_HiZ     (0x7 << 3)
+
+/* INT1 register */
+#define IDNO           (0xF << 0)
+#define VBUS           (1 << 4)
+
+/* STATUS1 register */
+#define CHGSTAT                (3 << 4)
+#define CHPORT         (1 << 6)
+#define DCPORT         (1 << 7)
+
+/* STATUS2 register */
+#define TEMP_STAT      (3 << 5)
+
+enum lp8727_dev_id {
+       ID_NONE,
+       ID_TA,
+       ID_DEDICATED_CHG,
+       ID_USB_CHG,
+       ID_USB_DS,
+       ID_MAX,
+};
+
+enum lp8727_chg_stat {
+       PRECHG,
+       CC,
+       CV,
+       EOC,
+};
+
+struct lp8727_psy {
+       struct power_supply ac;
+       struct power_supply usb;
+       struct power_supply batt;
+};
+
+struct lp8727_chg {
+       struct device *dev;
+       struct i2c_client *client;
+       struct mutex xfer_lock;
+       struct delayed_work work;
+       struct workqueue_struct *irqthread;
+       struct lp8727_platform_data *pdata;
+       struct lp8727_psy *psy;
+       struct lp8727_chg_param *chg_parm;
+       enum lp8727_dev_id devid;
+};
+
+static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 * data, u8 len)
+{
+       s32 ret;
+
+       mutex_lock(&pchg->xfer_lock);
+       ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
+       mutex_unlock(&pchg->xfer_lock);
+
+       return (ret != len) ? -EIO : 0;
+}
+
+static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 * data, u8 len)
+{
+       s32 ret;
+
+       mutex_lock(&pchg->xfer_lock);
+       ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
+       mutex_unlock(&pchg->xfer_lock);
+
+       return ret;
+}
+
+static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
+                                      u8 * data)
+{
+       return lp8727_i2c_read(pchg, reg, data, 1);
+}
+
+static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
+                                       u8 * data)
+{
+       return lp8727_i2c_write(pchg, reg, data, 1);
+}
+
+static int lp8727_is_charger_attached(const char *name, int id)
+{
+       if (name) {
+               if (!strcmp(name, "ac"))
+                       return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
+               else if (!strcmp(name, "usb"))
+                       return (id == ID_USB_CHG) ? 1 : 0;
+       }
+
+       return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
+}
+
+static void lp8727_init_device(struct lp8727_chg *pchg)
+{
+       u8 val;
+
+       val = ID200_EN | ADC_EN | CP_EN;
+       if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
+               dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
+
+       val = INT_EN | CHGDET_EN;
+       if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
+               dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
+}
+
+static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
+{
+       u8 val;
+       (void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
+       return (val & DCPORT);
+}
+
+static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
+{
+       u8 val;
+       (void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
+       return (val & CHPORT);
+}
+
+static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
+{
+       u8 val = sw;
+       (void)lp8727_i2c_write_byte(pchg, SWCTRL, &val);
+}
+
+static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
+{
+       u8 devid = ID_NONE;
+       u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
+
+       switch (id) {
+       case 0x5:
+               devid = ID_TA;
+               pchg->chg_parm = &pchg->pdata->ac;
+               break;
+       case 0xB:
+               if (lp8727_is_dedicated_charger(pchg)) {
+                       pchg->chg_parm = &pchg->pdata->ac;
+                       devid = ID_DEDICATED_CHG;
+               } else if (lp8727_is_usb_charger(pchg)) {
+                       pchg->chg_parm = &pchg->pdata->usb;
+                       devid = ID_USB_CHG;
+                       swctrl = SW_DM1_DM | SW_DP2_DP;
+               } else if (vbusin) {
+                       devid = ID_USB_DS;
+                       swctrl = SW_DM1_DM | SW_DP2_DP;
+               }
+               break;
+       default:
+               devid = ID_NONE;
+               pchg->chg_parm = NULL;
+               break;
+       }
+
+       pchg->devid = devid;
+       lp8727_ctrl_switch(pchg, swctrl);
+}
+
+static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
+{
+       u8 val;
+
+       (void)lp8727_i2c_read_byte(pchg, CTRL2, &val);
+       val |= CHGDET_EN;
+       (void)lp8727_i2c_write_byte(pchg, CTRL2, &val);
+}
+
+static void lp8727_delayed_func(struct work_struct *_work)
+{
+       u8 intstat[2], idno, vbus;
+       struct lp8727_chg *pchg =
+           container_of(_work, struct lp8727_chg, work.work);
+
+       if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
+               dev_err(pchg->dev, "can not read INT registers\n");
+               return;
+       }
+
+       idno = intstat[0] & IDNO;
+       vbus = intstat[0] & VBUS;
+
+       lp8727_id_detection(pchg, idno, vbus);
+       lp8727_enable_chgdet(pchg);
+
+       power_supply_changed(&pchg->psy->ac);
+       power_supply_changed(&pchg->psy->usb);
+       power_supply_changed(&pchg->psy->batt);
+}
+
+static irqreturn_t lp8727_isr_func(int irq, void *ptr)
+{
+       struct lp8727_chg *pchg = ptr;
+       unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
+
+       queue_delayed_work(pchg->irqthread, &pchg->work, delay);
+
+       return IRQ_HANDLED;
+}
+
+static void lp8727_intr_config(struct lp8727_chg *pchg)
+{
+       INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
+
+       pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
+       if (!pchg->irqthread)
+               dev_err(pchg->dev, "can not create thread for lp8727\n");
+
+       if (request_threaded_irq(pchg->client->irq,
+                                NULL,
+                                lp8727_isr_func,
+                                IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
+               dev_err(pchg->dev, "lp8727 irq can not be registered\n");
+       }
+}
+
+static enum power_supply_property lp8727_charger_prop[] = {
+       POWER_SUPPLY_PROP_ONLINE,
+};
+
+static enum power_supply_property lp8727_battery_prop[] = {
+       POWER_SUPPLY_PROP_STATUS,
+       POWER_SUPPLY_PROP_HEALTH,
+       POWER_SUPPLY_PROP_PRESENT,
+       POWER_SUPPLY_PROP_VOLTAGE_NOW,
+       POWER_SUPPLY_PROP_CAPACITY,
+       POWER_SUPPLY_PROP_TEMP,
+};
+
+static char *battery_supplied_to[] = {
+       "main_batt",
+};
+
+static int lp8727_charger_get_property(struct power_supply *psy,
+                                      enum power_supply_property psp,
+                                      union power_supply_propval *val)
+{
+       struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
+
+       if (psp == POWER_SUPPLY_PROP_ONLINE) {
+               val->intval = lp8727_is_charger_attached(psy->name,
+                                                        pchg->devid);
+       }
+
+       return 0;
+}
+
+static int lp8727_battery_get_property(struct power_supply *psy,
+                                      enum power_supply_property psp,
+                                      union power_supply_propval *val)
+{
+       struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
+       u8 read;
+
+       switch (psp) {
+       case POWER_SUPPLY_PROP_STATUS:
+               if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
+                       (void)lp8727_i2c_read_byte(pchg, STATUS1, &read);
+                       if (((read & CHGSTAT) >> 4) == EOC)
+                               val->intval = POWER_SUPPLY_STATUS_FULL;
+                       else
+                               val->intval = POWER_SUPPLY_STATUS_CHARGING;
+               } else {
+                       val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+               }
+               break;
+       case POWER_SUPPLY_PROP_HEALTH:
+               (void)lp8727_i2c_read_byte(pchg, STATUS2, &read);
+               read = (read & TEMP_STAT) >> 5;
+               if (read >= 0x1 && read <= 0x3)
+                       val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+               else
+                       val->intval = POWER_SUPPLY_HEALTH_GOOD;
+               break;
+       case POWER_SUPPLY_PROP_PRESENT:
+               if (pchg->pdata->get_batt_present)
+                       val->intval = pchg->pdata->get_batt_present();
+               break;
+       case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+               if (pchg->pdata->get_batt_level)
+                       val->intval = pchg->pdata->get_batt_level();
+               break;
+       case POWER_SUPPLY_PROP_CAPACITY:
+               if (pchg->pdata->get_batt_capacity)
+                       val->intval = pchg->pdata->get_batt_capacity();
+               break;
+       case POWER_SUPPLY_PROP_TEMP:
+               if (pchg->pdata->get_batt_temp)
+                       val->intval = pchg->pdata->get_batt_temp();
+               break;
+       default:
+               break;
+       }
+
+       return 0;
+}
+
+static void lp8727_charger_changed(struct power_supply *psy)
+{
+       struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
+       u8 val;
+       u8 eoc_level, ichg;
+
+       if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
+               if (pchg->chg_parm) {
+                       eoc_level = pchg->chg_parm->eoc_level;
+                       ichg = pchg->chg_parm->ichg;
+                       val = (ichg << 4) | eoc_level;
+                       (void)lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
+               }
+       }
+}
+
+static int lp8727_register_psy(struct lp8727_chg *pchg)
+{
+       struct lp8727_psy *psy;
+
+       psy = kzalloc(sizeof(*psy), GFP_KERNEL);
+       if (!psy)
+               goto err_mem;
+
+       pchg->psy = psy;
+
+       psy->ac.name = "ac";
+       psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
+       psy->ac.properties = lp8727_charger_prop;
+       psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
+       psy->ac.get_property = lp8727_charger_get_property;
+       psy->ac.supplied_to = battery_supplied_to;
+       psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+       if (power_supply_register(pchg->dev, &psy->ac))
+               goto err_psy;
+
+       psy->usb.name = "usb";
+       psy->usb.type = POWER_SUPPLY_TYPE_USB;
+       psy->usb.properties = lp8727_charger_prop;
+       psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
+       psy->usb.get_property = lp8727_charger_get_property;
+       psy->usb.supplied_to = battery_supplied_to;
+       psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+       if (power_supply_register(pchg->dev, &psy->usb))
+               goto err_psy;
+
+       psy->batt.name = "main_batt";
+       psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
+       psy->batt.properties = lp8727_battery_prop;
+       psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
+       psy->batt.get_property = lp8727_battery_get_property;
+       psy->batt.external_power_changed = lp8727_charger_changed;
+
+       if (power_supply_register(pchg->dev, &psy->batt))
+               goto err_psy;
+
+       return 0;
+
+err_mem:
+       return -ENOMEM;
+err_psy:
+       kfree(psy);
+       return -EPERM;
+}
+
+static void lp8727_unregister_psy(struct lp8727_chg *pchg)
+{
+       struct lp8727_psy *psy = pchg->psy;
+
+       if (psy) {
+               power_supply_unregister(&psy->ac);
+               power_supply_unregister(&psy->usb);
+               power_supply_unregister(&psy->batt);
+               kfree(psy);
+       }
+}
+
+static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+{
+       struct lp8727_chg *pchg;
+       int ret;
+
+       pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
+       if (!pchg)
+               return -ENOMEM;
+
+       pchg->client = cl;
+       pchg->dev = &cl->dev;
+       pchg->pdata = cl->dev.platform_data;
+       i2c_set_clientdata(cl, pchg);
+
+       mutex_init(&pchg->xfer_lock);
+
+       lp8727_init_device(pchg);
+       lp8727_intr_config(pchg);
+
+       ret = lp8727_register_psy(pchg);
+       if (ret) {
+               dev_err(pchg->dev,
+                       "can not register power supplies. err=%d", ret);
+       }
+
+       return 0;
+}
+
+static int __devexit lp8727_remove(struct i2c_client *cl)
+{
+       struct lp8727_chg *pchg = i2c_get_clientdata(cl);
+
+       lp8727_unregister_psy(pchg);
+       free_irq(pchg->client->irq, pchg);
+       flush_workqueue(pchg->irqthread);
+       destroy_workqueue(pchg->irqthread);
+       kfree(pchg);
+       return 0;
+}
+
+static const struct i2c_device_id lp8727_ids[] = {
+       {"lp8727", 0},
+};
+
+static struct i2c_driver lp8727_driver = {
+       .driver = {
+                  .name = "lp8727",
+                  },
+       .probe = lp8727_probe,
+       .remove = __devexit_p(lp8727_remove),
+       .id_table = lp8727_ids,
+};
+
+static int __init lp8727_init(void)
+{
+       return i2c_add_driver(&lp8727_driver);
+}
+
+static void __exit lp8727_chg_exit(void)
+{
+       i2c_del_driver(&lp8727_driver);
+}
+
+module_init(lp8727_init);
+module_exit(lp8727_chg_exit);
+
+MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
+MODULE_AUTHOR("Woogyom Kim <milo.kim@nsc.com>");
+MODULE_LICENSE("GPL");