475 lines
11 KiB
C
475 lines
11 KiB
C
/*
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* CellWise CW2015 battery driver
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*
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* Copyright (C) 2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/types.h>
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#include <linux/gpio/consumer.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/acpi.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#ifdef CONFIG_ARCH_SUNXI
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#include <linux/sunxi-gpio.h>
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#endif
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#define CW2015_REG_VERSION 0x00
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#define CW2015_REG_VCELL0 0x02
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#define CW2015_REG_VCELL1 0x03
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#define CW2015_REG_SOC0 0x04
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#define CW2015_REG_SOC1 0x05
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#define CW2015_REG_RRT_ALRT0 0x06
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#define CW2015_REG_RRT_ALRT1 0x07
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#define CW2015_REG_CONFIG 0x08
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#define CW2015_REG_MODE 0x0A
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#define CW2015_MODE_SLEEP (6)
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#define CW2015_MODE_QSTRT (4)
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#define CW2015_MODE_POR (0)
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#define CW2015_MANUFACTURER "CellWise"
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struct cw2015_device {
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struct i2c_client *client;
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struct device *dev;
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struct power_supply *charger;
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struct delayed_work bat_monitor;
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struct regmap *rmap;
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u32 alrt_threshold;
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u32 emerg_threshold;
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bool warning_on;
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struct mutex lock; /* protect state data */
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};
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static bool cw2015_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case CW2015_REG_VERSION:
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case CW2015_REG_VCELL0:
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case CW2015_REG_VCELL1:
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case CW2015_REG_SOC0:
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case CW2015_REG_SOC1:
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return false;
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default:
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return true;
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}
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}
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static const struct regmap_config cw2015_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = CW2015_REG_MODE,
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.cache_type = REGCACHE_NONE,
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.volatile_reg = cw2015_is_volatile_reg,
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};
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static irqreturn_t cw2015_irq_handler_thread(int irq, void *private)
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{
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int ret;
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struct cw2015_device *cw = private;
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unsigned int val;
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ret = regmap_read(cw->rmap, CW2015_REG_RRT_ALRT0, &val);
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if (val & 0x80)
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regmap_update_bits(cw->rmap, CW2015_REG_RRT_ALRT0, 0x80, 0x00);
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power_supply_changed(cw->charger);
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return IRQ_HANDLED;
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}
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static ssize_t cw2015_show_alrt_threshold(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct power_supply *psy = dev_get_drvdata(dev);
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struct cw2015_device *cw = power_supply_get_drvdata(psy);
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return scnprintf(buf, PAGE_SIZE, "%u\n", cw->alrt_threshold);
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}
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static DEVICE_ATTR(alrt_threshold, 0444, cw2015_show_alrt_threshold, NULL);
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static struct attribute *cw2015_battery_attr[] = {
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&dev_attr_alrt_threshold.attr,
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NULL,
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};
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static const struct attribute_group cw2015_attr_group = {
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.attrs = cw2015_battery_attr,
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};
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static unsigned int c2015_get_bat_voltage(struct cw2015_device *cw)
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{
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unsigned char vol[2];
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unsigned int voltage;
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regmap_bulk_read(cw->rmap, CW2015_REG_VCELL0, vol, 2);
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/*
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* 14bit ADC, voltage resolution is 305uV
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*/
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voltage = (((vol[0] & 0x3f) << 8) + vol[1]) * 305 / 1000;
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/*pr_info("h8-0x%x l8-0x%x, voltage=%u\n", vol[0], vol[1], voltage);*/
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return voltage;
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}
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static unsigned int c2015_get_bat_rest(struct cw2015_device *cw)
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{
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unsigned int rest;
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regmap_read(cw->rmap, CW2015_REG_SOC0, &rest);
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return rest;
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}
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static int cw2015_power_supply_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct cw2015_device *cw = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = CW2015_MANUFACTURER;
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = "cw2015";
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = c2015_get_bat_voltage(cw);
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = c2015_get_bat_rest(cw);
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break;
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case POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX:
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val->intval = cw->alrt_threshold;
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break;
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case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
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val->intval = cw->emerg_threshold;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int cw2015_power_supply_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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return false;
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}
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static enum power_supply_property cw2015_power_supply_props[] = {
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POWER_SUPPLY_PROP_MANUFACTURER,
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
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POWER_SUPPLY_PROP_CAPACITY_ALERT_MAX,
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};
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static const struct power_supply_desc cw2015_power_supply_desc = {
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.name = "battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = cw2015_power_supply_props,
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.num_properties = ARRAY_SIZE(cw2015_power_supply_props),
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.get_property = cw2015_power_supply_get_property,
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.property_is_writeable = cw2015_power_supply_property_is_writeable,
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};
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static char *cw2015_charger_supplied_to[] = {
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"main-battery",
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};
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struct power_supply_config cw2015_psy_cfg = {
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.supplied_to = cw2015_charger_supplied_to,
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.num_supplicants = ARRAY_SIZE(cw2015_charger_supplied_to),
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};
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static int cw2015_power_supply_init(struct cw2015_device *cw)
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{
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cw2015_psy_cfg.drv_data = cw,
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cw->charger = devm_power_supply_register(cw->dev,
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&cw2015_power_supply_desc,
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&cw2015_psy_cfg);
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return PTR_ERR_OR_ZERO(cw->charger);
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}
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#ifdef CONFIG_MISC_AXP_LEDS
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extern int axp_leds_control(unsigned int idx, unsigned int duty_ns);
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static void cw2015_bat_monitor(struct work_struct *work)
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{
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struct cw2015_device *cw =
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container_of(work, struct cw2015_device, bat_monitor.work);
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unsigned int rest;
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unsigned int duty_ns;
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power_supply_changed(cw->charger);
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rest = c2015_get_bat_rest(cw);
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if (rest <= cw->emerg_threshold) {
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/* duty:200ms, period:400ms */
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duty_ns = 200000000;
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axp_leds_control(0, duty_ns);
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cw->warning_on = true;
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} else if (rest <= cw->alrt_threshold) {
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/* duty:500ms, period:1000ms */
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duty_ns = 500000000;
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axp_leds_control(0, duty_ns);
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cw->warning_on = true;
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} else if (cw->warning_on) {
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axp_leds_control(0, 0);
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cw->warning_on = false;
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}
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schedule_delayed_work(&cw->bat_monitor, msecs_to_jiffies(10*1000));
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}
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#else
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static void cw2015_bat_monitor(struct work_struct *work)
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{
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struct cw2015_device *cw =
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container_of(work, struct cw2015_device, bat_monitor.work);
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power_supply_changed(cw->charger);
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schedule_delayed_work(&cw->bat_monitor, msecs_to_jiffies(10*1000));
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}
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#endif
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static int cw2015_fw_probe(struct cw2015_device *cw)
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{
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int ret;
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u32 property;
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struct device_node *np = cw->dev->of_node;
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int gpio;
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#ifdef CONFIG_ARCH_SUNXI
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struct gpio_config flags;
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#else
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enum of_gpio_flags flags;
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#endif
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gpio = of_get_named_gpio_flags(np, "cw,irq-gpio", 0,
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(enum of_gpio_flags *)&flags);
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if (gpio > 0) {
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#ifdef CONFIG_ARCH_SUNXI
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char pin_name[32];
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__u32 config;
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/* wakeup_gpio set pull */
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memset(pin_name, 0, sizeof(pin_name));
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sunxi_gpio_to_name(gpio, pin_name);
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config = SUNXI_PINCFG_PACK(SUNXI_PINCFG_TYPE_PUD, 1);
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if (gpio < SUNXI_PL_BASE)
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pin_config_set(SUNXI_PINCTRL, pin_name, config);
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else
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pin_config_set(SUNXI_R_PINCTRL, pin_name, config);
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#endif
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cw->client->irq = gpio_to_irq(gpio);
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}
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ret = device_property_read_u32(cw->dev, "cw,alrt-threshold",
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&property);
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if (ret < 0)
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return ret;
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cw->alrt_threshold = property;
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ret = device_property_read_u32(cw->dev, "cw,emerg-threshold",
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&property);
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if (ret < 0)
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property = 0;
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cw->emerg_threshold = property;
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return 0;
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}
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static int cw2015_hw_init(struct cw2015_device *cw)
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{
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unsigned int mode, value;
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regmap_read(cw->rmap, CW2015_REG_MODE, &mode);
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mode &= (~(0x3 << CW2015_MODE_SLEEP));
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mode |= (0x3 << CW2015_MODE_QSTRT);
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regmap_write(cw->rmap, CW2015_REG_MODE, mode);
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regmap_read(cw->rmap, CW2015_REG_CONFIG, &value);
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regmap_update_bits(cw->rmap, CW2015_REG_CONFIG,
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0xf8, (cw->alrt_threshold << 3));
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return 0;
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}
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static int cw2015_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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struct device *dev = &client->dev;
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struct cw2015_device *cw;
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int ret = 0;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
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return -ENODEV;
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}
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cw = devm_kzalloc(dev, sizeof(*cw), GFP_KERNEL);
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if (!cw)
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return -ENOMEM;
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cw->client = client;
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cw->dev = dev;
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mutex_init(&cw->lock);
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cw->rmap = devm_regmap_init_i2c(client, &cw2015_regmap_config);
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if (IS_ERR(cw->rmap)) {
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dev_err(dev, "failed to allocate register map\n");
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return PTR_ERR(cw->rmap);
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}
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i2c_set_clientdata(client, cw);
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ret = cw2015_fw_probe(cw);
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if (ret < 0) {
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dev_err(dev, "Cannot read device properties.\n");
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return ret;
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}
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ret = cw2015_hw_init(cw);
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if (ret < 0) {
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dev_err(dev, "hw init failed.\n");
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return ret;
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}
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ret = cw2015_power_supply_init(cw);
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if (ret < 0) {
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dev_err(dev, "Failed to register power supply\n");
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return ret;
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}
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if (client->irq > 0) {
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ret = devm_request_threaded_irq(dev, client->irq, NULL,
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cw2015_irq_handler_thread,
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IRQF_TRIGGER_FALLING |
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IRQF_ONESHOT | IRQF_SHARED,
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"cw2015", cw);
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if (ret) {
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dev_err(dev, "request IRQ #%d failed\n", client->irq);
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return ret;
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}
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}
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INIT_DELAYED_WORK(&cw->bat_monitor, cw2015_bat_monitor);
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schedule_delayed_work(&cw->bat_monitor, msecs_to_jiffies(2 * 1000));
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ret = sysfs_create_group(&cw->charger->dev.kobj, &cw2015_attr_group);
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if (ret < 0) {
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dev_err(dev, "Can't create sysfs entries\n");
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return ret;
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}
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return 0;
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}
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static int cw2015_remove(struct i2c_client *client)
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{
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struct cw2015_device *cw = i2c_get_clientdata(client);
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sysfs_remove_group(&cw->charger->dev.kobj, &cw2015_attr_group);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int cw2015_suspend(struct device *dev)
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{
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struct cw2015_device *cw = dev_get_drvdata(dev);
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unsigned int mode;
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regmap_read(cw->rmap, CW2015_REG_MODE, &mode);
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mode &= (~(0x3 << CW2015_MODE_QSTRT));
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mode |= (0x3 << CW2015_MODE_SLEEP);
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regmap_write(cw->rmap, CW2015_REG_MODE, mode);
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return 0;
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}
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static int cw2015_resume(struct device *dev)
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{
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struct cw2015_device *cw = dev_get_drvdata(dev);
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unsigned int mode;
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regmap_read(cw->rmap, CW2015_REG_MODE, &mode);
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mode &= (~(0x3 << CW2015_MODE_SLEEP));
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mode |= (0x3 << CW2015_MODE_QSTRT);
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regmap_write(cw->rmap, CW2015_REG_MODE, mode);
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/* signal userspace, maybe state changed while suspended */
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power_supply_changed(cw->charger);
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return 0;
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}
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#endif
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static const struct dev_pm_ops cw2015_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(cw2015_suspend, cw2015_resume)
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};
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static const struct i2c_device_id cw2015_i2c_ids[] = {
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{ "cw2015", 0 },
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{},
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};
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MODULE_DEVICE_TABLE(i2c, cw2015_i2c_ids);
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static const struct of_device_id cw2015_of_match[] = {
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{ .compatible = "cellwise,cw2015", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, cw2015_of_match);
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static struct i2c_driver cw2015_driver = {
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.driver = {
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.name = "cw2015-battery",
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.of_match_table = of_match_ptr(cw2015_of_match),
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.pm = &cw2015_pm,
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},
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.probe = cw2015_probe,
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.remove = cw2015_remove,
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.id_table = cw2015_i2c_ids,
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};
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module_i2c_driver(cw2015_driver);
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MODULE_AUTHOR("ForeverCai <caiyongheng@allwinnertech.com>");
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MODULE_DESCRIPTION("cw2015 charger driver");
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MODULE_LICENSE("GPL");
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