--- /dev/null
+/*
+ * BQ27510 battery driver
+ *
+ * This package 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.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#include <linux/module.h>
+#include <linux/param.h>
+#include <linux/jiffies.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/idr.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#define DRIVER_VERSION "1.1.0"
+
+#define BQ27x00_REG_TEMP 0x06
+#define BQ27x00_REG_VOLT 0x08
+#define BQ27x00_REG_AI 0x14
+#define BQ27x00_REG_FLAGS 0x0A
+#define BQ27x00_REG_TTE 0x16
+#define BQ27x00_REG_TTF 0x18
+#define BQ27x00_REG_TTECP 0x26
+
+#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
+#define BQ27000_FLAG_CHGS BIT(7)
+
+#define BQ27500_REG_SOC 0x2c
+#define BQ27500_FLAG_DSC BIT(0)
+#define BQ27500_FLAG_FC BIT(9)
+
+#define BQ27510_SPEED 300 * 1000
+
+/* If the system has several batteries we need a different name for each
+ * of them...
+ */
+static DEFINE_MUTEX(battery_mutex);
+
+struct bq27510_device_info {
+ struct device *dev;
+ struct power_supply bat;
+ struct delayed_work work;
+ unsigned int interval;
+ struct i2c_client *client;
+};
+
+static enum power_supply_property bq27510_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+ POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+ POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+};
+
+/*
+ * Common code for BQ27510 devices read
+ */
+static int bq27510_read(struct i2c_client *client, u8 reg, u8 buf[], unsigned len)
+{
+ int ret;
+ ret = i2c_master_reg8_recv(client, reg, buf, len, BQ27510_SPEED);
+ return ret;
+}
+
+/*
+ * Return the battery temperature in tenths of degree Celsius
+ * Or < 0 if something fails.
+ */
+static int bq27510_battery_temperature(struct bq27510_device_info *di)
+{
+ int ret;
+ int temp = 0;
+ u8 buf[2];
+ ret = bq27510_read(di->client,BQ27x00_REG_TEMP,buf,2);
+ if (ret) {
+ dev_err(di->dev, "error reading temperature\n");
+ return ret;
+ }
+ temp = get_unaligned_le16(buf);
+ return temp - 2731;
+}
+
+/*
+ * Return the battery Voltage in milivolts
+ * Or < 0 if something fails.
+ */
+static int bq27510_battery_voltage(struct bq27510_device_info *di)
+{
+ int ret;
+ u8 buf[2];
+ int volt = 0;
+
+ ret = bq27510_read(di->client,BQ27x00_REG_VOLT,buf,2);
+ if (ret) {
+ dev_err(di->dev, "error reading voltage\n");
+ return ret;
+ }
+ volt = get_unaligned_le16(buf);
+ return volt * 1000;
+}
+
+/*
+ * Return the battery average current
+ * Note that current can be negative signed as well
+ * Or 0 if something fails.
+ */
+static int bq27510_battery_current(struct bq27510_device_info *di)
+{
+ int ret;
+ int curr = 0;
+ u8 buf[2];
+
+ ret = bq27510_read(di->client,BQ27x00_REG_AI,buf,2);
+ if (ret) {
+ dev_err(di->dev, "error reading current\n");
+ return 0;
+ }
+
+ curr = get_unaligned_le16(buf);
+ return curr * 1000;
+}
+
+/*
+ * Return the battery Relative State-of-Charge
+ * Or < 0 if something fails.
+ */
+static int bq27510_battery_rsoc(struct bq27510_device_info *di)
+{
+ int ret;
+ int rsoc = 0;
+ u8 buf[2];
+
+ ret = bq27510_read(di->client,BQ27500_REG_SOC,buf,2);
+ if (ret) {
+ dev_err(di->dev, "error reading relative State-of-Charge\n");
+ return ret;
+ }
+ rsoc = get_unaligned_le16(buf);
+ return rsoc;
+}
+
+static int bq27510_battery_status(struct bq27510_device_info *di,
+ union power_supply_propval *val)
+{
+ u8 buf[2];
+ int flags = 0;
+ int status;
+ int ret;
+
+ ret = bq27510_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
+ if (ret < 0) {
+ dev_err(di->dev, "error reading flags\n");
+ return ret;
+ }
+ flags = get_unaligned_le16(buf);
+ if (flags & BQ27500_FLAG_FC)
+ status = POWER_SUPPLY_STATUS_FULL;
+ else if (flags & BQ27500_FLAG_DSC)
+ status = POWER_SUPPLY_STATUS_DISCHARGING;
+ else
+ status = POWER_SUPPLY_STATUS_CHARGING;
+
+ val->intval = status;
+ return 0;
+}
+
+/*
+ * Read a time register.
+ * Return < 0 if something fails.
+ */
+static int bq27510_battery_time(struct bq27510_device_info *di, int reg,
+ union power_supply_propval *val)
+{
+ u8 buf[2];
+ int tval = 0;
+ int ret;
+
+ ret = bq27510_read(di->client,reg,buf,2);
+ if (ret) {
+ dev_err(di->dev, "error reading register %02x\n", reg);
+ return ret;
+ }
+ tval = get_unaligned_le16(buf);
+ if (tval == 65535)
+ return -ENODATA;
+
+ val->intval = tval * 60;
+ return 0;
+}
+
+#define to_bq27510_device_info(x) container_of((x), \
+ struct bq27510_device_info, bat);
+
+static int bq27510_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct bq27510_device_info *di = to_bq27510_device_info(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = bq27510_battery_status(di, val);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = bq27510_battery_voltage(di);
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = val->intval <= 0 ? 0 : 1;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = bq27510_battery_current(di);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = bq27510_battery_rsoc(di);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = bq27510_battery_temperature(di);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
+ ret = bq27510_battery_time(di, BQ27x00_REG_TTE, val);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+ ret = bq27510_battery_time(di, BQ27x00_REG_TTECP, val);
+ break;
+ case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
+ ret = bq27510_battery_time(di, BQ27x00_REG_TTF, val);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static void bq27510_powersupply_init(struct bq27510_device_info *di)
+{
+ di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->bat.properties = bq27510_battery_props;
+ di->bat.num_properties = ARRAY_SIZE(bq27510_battery_props);
+ di->bat.get_property = bq27510_battery_get_property;
+ di->bat.external_power_changed = NULL;
+}
+
+static void bq27510_battery_update_status(struct bq27510_device_info *di)
+{
+ power_supply_changed(&di->bat);
+}
+
+static void bq27510_battery_work(struct work_struct *work)
+{
+ struct bq27510_device_info *di = container_of(work, struct bq27510_device_info, work.work);
+
+ bq27510_battery_update_status(di);
+ /* reschedule for the next time */
+ schedule_delayed_work(&di->work, di->interval);
+}
+
+static int bq27510_battery_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct bq27510_device_info *di;
+ int retval = 0;
+
+ di = kzalloc(sizeof(*di), GFP_KERNEL);
+ if (!di) {
+ dev_err(&client->dev, "failed to allocate device info data\n");
+ retval = -ENOMEM;
+ goto batt_failed_2;
+ }
+ i2c_set_clientdata(client, di);
+ di->dev = &client->dev;
+ di->bat.name = "bq27510-battery";
+ di->client = client;
+ /* 4 seconds between monotor runs interval */
+ di->interval = msecs_to_jiffies(4 * 1000);
+ bq27510_powersupply_init(di);
+
+ retval = power_supply_register(&client->dev, &di->bat);
+ if (retval) {
+ dev_err(&client->dev, "failed to register battery\n");
+ goto batt_failed_4;
+ }
+ INIT_DELAYED_WORK(&di->work, bq27510_battery_work);
+ schedule_delayed_work(&di->work, di->interval);
+ dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
+
+ return 0;
+
+batt_failed_4:
+ kfree(di);
+batt_failed_2:
+ return retval;
+}
+
+static int bq27510_battery_remove(struct i2c_client *client)
+{
+ struct bq27510_device_info *di = i2c_get_clientdata(client);
+
+ power_supply_unregister(&di->bat);
+
+ kfree(di->bat.name);
+
+ kfree(di);
+
+ return 0;
+}
+
+/*
+ * Module stuff
+ */
+
+static const struct i2c_device_id bq27510_id[] = {
+ { "bq27510", 0 },
+};
+
+static struct i2c_driver bq27510_battery_driver = {
+ .driver = {
+ .name = "bq27510-battery",
+ },
+ .probe = bq27510_battery_probe,
+ .remove = bq27510_battery_remove,
+ .id_table = bq27510_id,
+};
+
+static int __init bq27510_battery_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&bq27510_battery_driver);
+ if (ret)
+ printk(KERN_ERR "Unable to register BQ27510 driver\n");
+
+ return ret;
+}
+module_init(bq27510_battery_init);
+
+static void __exit bq27510_battery_exit(void)
+{
+ i2c_del_driver(&bq27510_battery_driver);
+}
+module_exit(bq27510_battery_exit);
+
+MODULE_AUTHOR("Rockchip");
+MODULE_DESCRIPTION("BQ27510 battery monitor driver");
+MODULE_LICENSE("GPL");
projects / firefly-linux-kernel-4.4.55.git / blobdiff