--- /dev/null
+/* drivers/power/stc3100_battery
+ * STC31000 battery driver
+ *
+ * Copyright (C) 2009 Rockchip Corporation.
+ *
+ * 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 <asm/unaligned.h>
+#include <mach/gpio.h>
+#define DRIVER_VERSION "1.0.0"
+
+
+#define DC_CHECKPIN RK29_PIN4_PA4 ///da check charge pin
+#define BATTAERY_CAPACITY_MAH 2000 /// define battery capacity mah
+#define RSENSE_RESISTANCE 10 /// Rsense resistance m¦¸
+
+#define STC3100_REG_MODE 0x00
+#define STC3100_REG_CTRL 0x01
+#define STC3100_REG_RSOCL 0x02 /* Relative State-of-Charge */
+#define STC3100_REG_RSOCH 0x03
+#define STC3100_REG_AIL 0x06
+#define STC3100_REG_AIH 0x07
+#define STC3100_REG_VOLTL 0x08
+#define STC3100_REG_VOLTH 0x09
+#define STC3100_REG_TEMPL 0x0A
+#define STC3100_REG_TEMPH 0x0B
+
+#define STC3100_SPEED 300 * 1000
+
+struct stc3100_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 stc3100_battery_props[] = {
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+
+static int stc3100_write_regs(struct i2c_client *client, u8 reg, u8 const buf[], __u16 len)
+{
+ int ret;
+ ret = i2c_master_reg8_send(client, reg, buf, (int)len, STC3100_SPEED);
+ return ret;
+}
+/*
+ * Common code for STC3100 devices read
+ */
+static int stc3100_read_regs(struct i2c_client *client, u8 reg, u8 buf[], unsigned len)
+{
+ int ret;
+ ret = i2c_master_reg8_recv(client, reg, buf, len, STC3100_SPEED);
+ return ret;
+}
+
+/*
+ * Return the battery temperature in Celsius degrees
+ * Or < 0 if something fails.
+ */
+static int stc3100_battery_temperature(struct stc3100_device_info *di)
+{
+ int ret;
+ u8 regs[2];
+
+ ret = stc3100_read_regs(di->client,STC3100_REG_TEMPL,regs,2);
+ if (ret) {
+ dev_err(di->dev, "error reading temperature\n");
+ return ret;
+ }
+
+ return (((((int)regs[1]&0xf)<<8) & (int)regs[0])>>3); ///temperature (¡ãC) = Temperature_code * 0.125.
+}
+
+/*
+ * Return the battery Voltage in milivolts
+ * Or < 0 if something fails.
+ */
+static int stc3100_battery_voltage(struct stc3100_device_info *di)
+{
+ int ret;
+ u8 regs[2];
+
+ ret = stc3100_read_regs(di->client,STC3100_REG_VOLTL,regs,2);
+ if (ret) {
+ dev_err(di->dev, "error reading voltage\n");
+ return ret;
+ }
+
+ return (((((int)regs[1]&0xf)<<8) & (int)regs[0])*61/25); //voltage (mV) = Voltage_code * 2.44.
+}
+
+/*
+ * Return the battery average current
+ * Note that current can be negative signed as well
+ * Or 0 if something fails.
+ */
+static int stc3100_battery_current(struct stc3100_device_info *di)
+{
+ int ret;
+ u8 regs[2];
+
+ ret = stc3100_read_regs(di->client,STC3100_REG_AIL,regs,2);
+ if (ret) {
+ dev_err(di->dev, "error reading current\n");
+ return 0;
+ }
+
+ return (((((int)regs[1]&0xf)<<8) & (int)regs[0])*1177/(100*RSENSE_RESISTANCE)); ///current (mA) = current_code* 11.77 / Rsense (m¦¸)
+}
+
+/*
+ * Return the battery Relative State-of-Charge
+ * Or < 0 if something fails.
+ */
+static int stc3100_battery_rsoc(struct stc3100_device_info *di)
+{
+ int ret;
+ u8 regs[2];
+
+ ret = stc3100_read_regs(di->client,STC3100_REG_RSOCL,regs,2);
+ if (ret) {
+ dev_err(di->dev, "error reading relative State-of-Charge\n");
+ return ret;
+ }
+
+ return (((((int)regs[1])<<8) & (int)regs[0])*67/(10*RSENSE_RESISTANCE)); ////charge data (mA.h) = 6.70 * charge_code / Rsense (m¦¸).
+}
+
+static int dc_charge_status(void)
+{
+ if(gpio_get_value(DC_CHECKPIN))
+ return POWER_SUPPLY_STATUS_CHARGING;
+ else
+ return POWER_SUPPLY_STATUS_NOT_CHARGING;
+}
+
+static int stc3100_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct stc3100_device_info *di = container_of(psy, struct stc3100_device_info, bat);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ val->intval = dc_charge_status();
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_PRESENT:
+ val->intval = stc3100_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 = stc3100_battery_current(di);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = stc3100_battery_rsoc(di);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ val->intval = stc3100_battery_temperature(di);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void stc3100_powersupply_init(struct stc3100_device_info *di)
+{
+ di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+ di->bat.properties = stc3100_battery_props;
+ di->bat.num_properties = ARRAY_SIZE(stc3100_battery_props);
+ di->bat.get_property = stc3100_battery_get_property;
+ di->bat.external_power_changed = NULL;
+}
+
+static void stc3100_battery_update_status(struct stc3100_device_info *di)
+{
+ power_supply_changed(&di->bat);
+}
+
+static void stc3100_battery_work(struct work_struct *work)
+{
+ struct stc3100_device_info *di = container_of(work, struct stc3100_device_info, work.work);
+
+ stc3100_battery_update_status(di);
+ /* reschedule for the next time */
+ schedule_delayed_work(&di->work, di->interval);
+}
+
+static int stc3100_battery_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct stc3100_device_info *di;
+ int retval = 0;
+ u8 regs[2] = {0x10,0x1d}; ///init regs mode ctrl
+
+ 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 = "stc3100-battery";
+ di->client = client;
+ stc3100_write_regs(client, STC3100_REG_MODE, regs, 2);
+ /* 4 seconds between monotor runs interval */
+ di->interval = msecs_to_jiffies(4 * 1000);
+ stc3100_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_3;
+ }
+
+ INIT_DELAYED_WORK(&di->work, stc3100_battery_work);
+ schedule_delayed_work(&di->work, di->interval);
+
+ dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
+
+ return 0;
+
+batt_failed_3:
+ kfree(di);
+batt_failed_2:
+ return retval;
+}
+
+static int stc3100_battery_remove(struct i2c_client *client)
+{
+ struct stc3100_device_info *di = i2c_get_clientdata(client);
+
+ cancel_delayed_work_sync(&di->work);
+ power_supply_unregister(&di->bat);
+
+ kfree(di->bat.name);
+
+ kfree(di);
+
+ return 0;
+}
+
+/*
+ * Module stuff
+ */
+
+static const struct i2c_device_id stc3100_id[] = {
+ { "stc3100", 0 },
+ {},
+};
+
+static struct i2c_driver stc3100_battery_driver = {
+ .driver = {
+ .name = "stc3100-battery",
+ },
+ .probe = stc3100_battery_probe,
+ .remove = stc3100_battery_remove,
+ .id_table = stc3100_id,
+};
+
+static int __init stc3100_battery_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&stc3100_battery_driver);
+ if (ret)
+ printk(KERN_ERR "Unable to register BQ27200 driver\n");
+
+ return ret;
+}
+module_init(stc3100_battery_init);
+
+static void __exit stc3100_battery_exit(void)
+{
+ i2c_del_driver(&stc3100_battery_driver);
+}
+module_exit(stc3100_battery_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
+MODULE_LICENSE("GPL");
projects / firefly-linux-kernel-4.4.55.git / commitdiff