平台默认 pmic 线性充电
sprd_2721_charge.c 命名以 pmic 型号+charge 为规则，实现平台默认线性充电方案，文件将硬件实现和逻辑接口注册放在同一个文件中。
probe函数：
static int sprdchg_2721_probe(struct platform_device *pdev)
{
struct sprd2721_device *sprd_2721 = NULL;
struct sprd2721_platform_data *pdata = pdev->dev.platform_data;
int ret = 0;
struct power_supply *ret_ptr = NULL;
struct power_supply_desc *charger_desc = NULL;
printk("YGH:%s:start \n",__func__);
reg_map = dev_get_regmap(pdev->dev.parent, NULL);
if (!reg_map) {
dev_err(&pdev->dev, "%s :NULL regmap for charge 2721\n",
__func__);
return -EINVAL;
}
sprd_2721 = devm_kzalloc(&pdev->dev, sizeof(*sprd_2721), GFP_KERNEL);
if (!sprd_2721)
return -ENOMEM;
if (!pdata)
//解析设备树，在其中有一个gpio_chg_cv_state、chg-ovi-gpios
//其中chg-cv-gpio，当vbat高于cccv时触发（CCCV恒压恒流充电）
//其中chg-ovi-gpios，充电电压较高时触发
pdata = sprdchg_2721_parse_dt(&pdev->dev);
if (IS_ERR_OR_NULL(pdata))
return PTR_ERR(pdata);
g_pdata = pdata;
sprd_2721->dev = &pdev->dev;
platform_set_drvdata(pdev, sprd_2721);
if (pdata->gpio_chg_cv_state) {
ret = devm_gpio_request(&pdev->dev,
pdata->gpio_chg_cv_state, "chg_cv_state");
if (ret) {
dev_err(&pdev->dev,
"failed to request gpio: %d\n", ret);
return ret;
}
gpio_direction_input(pdata->gpio_chg_cv_state);
pdata->irq_chg_cv_state = gpio_to_irq(pdata->gpio_chg_cv_state);
irq_set_status_flags(pdata->irq_chg_cv_state, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(&pdev->dev,
pdata->irq_chg_cv_state, NULL,
sprdchg_chg_cv_irq,
IRQF_NO_SUSPEND | IRQF_ONESHOT,
"sprdbat_chg_cv_state", sprd_2721);
if (ret) {
dev_err(&pdev->dev,
"failed to request chg cv irq: %d\n", ret);
return ret;
}
}
if (pdata->gpio_vchg_ovi) {
ret = devm_gpio_request(&pdev->dev,
pdata->gpio_vchg_ovi, "vchg_ovi");
if (ret) {
dev_err(&pdev->dev,
"failed to request gpio: %d\n", ret);
return ret;
}
gpio_direction_input(pdata->gpio_vchg_ovi);
pdata->irq_vchg_ovi = gpio_to_irq(pdata->gpio_vchg_ovi);
irq_set_status_flags(pdata->irq_vchg_ovi, IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(&pdev->dev,
pdata->irq_vchg_ovi, NULL,
sprdchg_vchg_ovi_irq,
IRQF_NO_SUSPEND | IRQF_ONESHOT,
"sprdbat_vchg_ovi", sprd_2721);
if (ret) {
dev_err(&pdev->dev,
"failed to request chg ovi irq: %d\n", ret);
return ret;
}
}
//如果CONFIG_OTP_SPRD_PMIC_EFUSE这个选项有的话，就会调用，然后获取cv的电压值
sprdchg_cccv_cal_get();
//注册回调函数
sprdbat_register_ext_ops(&sprd_2721_op);
charger_desc = devm_kzalloc(&pdev->dev,
sizeof(*charger_desc), GFP_KERNEL);
if (charger_desc == NULL) {
ret = -ENOMEM;
sprd_2721 = NULL;
return ret;
}
//注册内部充电的power_supply
sprd_2721->charger.desc = charger_desc;
charger_desc->name = CHG_PSY_INNER;
charger_desc->type = POWER_SUPPLY_TYPE_UNKNOWN;
charger_desc->get_property = sprd2721_get_property;
ret_ptr = power_supply_register(&pdev->dev,
sprd_2721->charger.desc, NULL);
if (IS_ERR(ret_ptr)) {
dev_err(&pdev->dev, "failed to register sprd_2721 psy: %p\n",
ret_ptr);
return PTR_ERR(ret_ptr);
}
SPRDCHG_DEBUG("%s probe ok\n", __func__);
printk("YGH:%s:end \n",__func__);
return 0;
}
其中来简单介绍下sprd_2721_op的回调函数的：
static struct sprd_ext_ic_operations sprd_2720_op = {
.ic_init = sprdchg_chip_init,
.charge_start_ext = sprdchg_start_charge,
.set_charge_cur = sprdchg_set_chg_cur,
.charge_stop_ext = sprdchg_stop_charge,
.get_charging_status = sprdchg_get_cccvstate,
.get_charging_fault = sprdchg_get_charge_fault,
.get_charge_cur_ext = sprdchg_get_chg_cur,
.set_termina_vol_ext = sprdchg_termina_vol_set,
};其中sprdchg_chip_init函数是初始化充电芯片的：
static void sprdchg_chip_init(struct sprdbat_drivier_data *bdata)
{
if (bdata == NULL)
return;
bat_drv_data = bdata;
glb_adi_write(ANA_REG_GLB_CHGR_CTRL0,
BIT_CHGR_CC_EN, BIT_CHGR_CC_EN);
chg_adi_write(ANA_REG_GLB_CHGR_CTRL0,
BITS_CHGR_CV_V(0U), BITS_CHGR_CV_V(~0U));
chg_adi_write(ANA_REG_GLB_CHGR_CTRL0,
BITS_CHGR_DPM(3), BITS_CHGR_DPM(~0U));
sprdchg_termina_vol_set(bat_drv_data->pdata->chg_end_vol_pure);
sprdchg_set_chg_ovp(bat_drv_data->pdata->ovp_stop);
sprdchg_set_eoc_level(0);
}sprdchg_start_charge函数：
static void sprdchg_start_charge(void)
{
chg_adi_write(ANA_REG_GLB_CHGR_CTRL0, 0, BIT_CHGR_PD);
_sprdchg_set_recharge();
}设置充电状态，并且设置复充状态位
设置充电sprdchg_set_chg_cur电流：
线性充电方案充电电流设置下限为 300mA，电流上限为 2300mA，300mA – 1400mA 设置最小步进单位为 50mA，1400mA – 2300mA 设置最小步进单位为 100mA。
static void sprdchg_set_chg_cur(uint32_t chg_current)
{
uint32_t temp;
if (bat_drv_data == NULL)
return;
if (bat_drv_data->bat_info.chg_current_type_limit < chg_current)
bat_drv_data->bat_info.chg_current_type_limit = chg_current;
if (chg_current > SPRDBAT_CHG_CUR_LEVEL_MAX)
chg_current = SPRDBAT_CHG_CUR_LEVEL_MAX;
if (chg_current < SPRDBAT_CHG_CUR_LEVEL_MIN)
chg_current = SPRDBAT_CHG_CUR_LEVEL_MIN;
if (chg_current < 1400) {
temp = ((chg_current - 300) / 50);
} else {
temp = ((chg_current - 1400) / 100);
temp += 0x16;
}
chg_adi_write(ANA_REG_GLB_CHGR_CTRL0, 0,
BIT_CHGR_CC_EN);
chg_adi_write(ANA_REG_GLB_CHGR_CTRL1,
BITS_CHGR_CC_I(temp),
BITS_CHGR_CC_I(~0U));
chg_adi_write(ANA_REG_GLB_CHGR_CTRL0,
BIT_CHGR_CC_EN, BIT_CHGR_CC_EN);
}
开关充电充电电流需要根据使用的 IC 不同区分设置。
sprdchg_stop_charge函数
停止充电
sprdchg_get_cccvstate函数
static int sprdchg_get_cccvstate(void)
{
SPRDCHG_DEBUG("sprdbat:cv state:0x%x, iterm:0x%x",
chg_adi_read(ANA_REG_GLB_CHGR_STATUS),
chg_adi_read(ANA_REG_GLB_CHGR_CTRL0));
return ((chg_adi_read(ANA_REG_GLB_CHGR_STATUS) &
BIT_CHGR_CV_STATUS) ? 1 : 0);
}