高通kernel充电参数定义

1.从log中看出kernel初始化充电模块从subsys_initcall(batterydata_init);开始。

[    2.818350] BATTERY: batterydata_init: Battery-data device created!

2.batterydata_init做了什么？

看下代码

int batterydata_init(void)
{
	int rc;
	struct battery_data *battery;

	battery = kzalloc(sizeof(*battery), GFP_KERNEL);
	if (!battery) {
		pr_err("Unable to allocate memory\n");
		return -ENOMEM;
	}

	/* character device to access the battery-data from userspace */
	rc = alloc_chrdev_region(&battery->dev_no, 0, 1, "battery_data");
	if (rc) {
		pr_err("Unable to allocate chrdev rc=%d\n", rc);
		return rc;
	}
	cdev_init(&battery->battery_cdev, &battery_data_fops);
	rc = cdev_add(&battery->battery_cdev, battery->dev_no, 1);
	if (rc) {
		pr_err("Unable to add battery_cdev rc=%d\n", rc);
		goto unregister_chrdev;
	}

	battery->battery_class = class_create(THIS_MODULE, "battery_data");
	if (IS_ERR_OR_NULL(battery->battery_class)) {
		pr_err("Fail to create battery class\n");
		rc = -ENODEV;
		goto delete_cdev;
	}

	battery->battery_device = device_create(battery->battery_class,
					NULL, battery->dev_no,
					NULL, "battery_data");
	if (IS_ERR(battery->battery_device)) {
		pr_err("Fail to create battery_device device\n");
		rc = -ENODEV;
		goto delete_cdev;
	}

	the_battery = battery;

	pr_info("Battery-data device created!\n");

	return 0;

delete_cdev:
	cdev_del(&battery->battery_cdev);
unregister_chrdev:
	unregister_chrdev_region(battery->dev_no, 1);
	the_battery = NULL;
	return rc;
}

主要是填充结构体struct battery_data *battery;其他的都是正常的系统调用进行模块，设备注册，以及节点加载。

看看结构体battery_data里面有什么？

struct battery_data {
	dev_t				dev_no;
	struct class			*battery_class;
	struct device			*battery_device;
	struct cdev			battery_cdev;
	struct bms_battery_data		*profile;
};

主要是struct bms_battery_data *profile;这个结构体，其他的都是通用的。

看看bms_battery_data里面是什么？

/**
 * struct bms_battery_data -
 * @fcc:		full charge capacity (mAmpHour)
 * @fcc_temp_lut:	table to get fcc at a given temp
 * @pc_temp_ocv_lut:	table to get percent charge given batt temp and cycles
 * @pc_sf_lut:		table to get percent charge scaling factor given cycles
 *			and percent charge
 * @rbatt_sf_lut:	table to get battery resistance scaling factor given
 *			temperature and percent charge
 * @default_rbatt_mohm:	the default value of battery resistance to use when
 *			readings from bms are not available.
 * @delta_rbatt_mohm:	the resistance to be added towards lower soc to
 *			compensate for battery capacitance.
 * @rbatt_capacitve_mohm: the resistance to be added to compensate for
 *				battery capacitance
 * @flat_ocv_threshold_uv: the voltage where the battery's discharge curve
 *				starts flattening out.
 * @max_voltage_uv:	max voltage of the battery
 * @cutoff_uv:		cutoff voltage of the battery
 * @iterm_ua:		termination current of the battery when charging
 *			to 100%
 * @batt_id_kohm:	the best matched battery id resistor value
 * @fastchg_current_ma: maximum fast charge current
 * @fg_cc_cv_threshold_mv: CC to CV threashold voltage
 */

struct bms_battery_data {
	unsigned int		fcc;
	struct single_row_lut	*fcc_temp_lut;
	struct single_row_lut	*fcc_sf_lut;
	struct pc_temp_ocv_lut	*pc_temp_ocv_lut;
	struct ibat_temp_acc_lut *ibat_acc_lut;
	struct sf_lut		*pc_sf_lut;
	struct sf_lut		*rbatt_sf_lut;
	int			default_rbatt_mohm;
	int			delta_rbatt_mohm;
	int			rbatt_capacitive_mohm;
	int			flat_ocv_threshold_uv;
	int			max_voltage_uv;
	int			cutoff_uv;
	int			iterm_ua;
	int			batt_id_kohm;
	int			fastchg_current_ma;
	int			fg_cc_cv_threshold_mv;
	const char		*battery_type;
};

这里有大量和充电相关的参数定义。就是我们要找的参数。具体参数含义注释都有。