Hi! This allows user to disable the green LED, so that it can be used for other notifications. It also allows him to set lower voltage limits, and adjust current: lower current and voltage limits will result in longer battery lifetime.
Currently I'm using
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
attributes to control it. Do we have something suitable for LED
control? Are the current/voltage limits ok to use?
Best regards,
Pavel
diff --git a/drivers/power/supply/cpcap-battery.c
b/drivers/power/supply/cpcap-battery.c
index 98ba078..839e365 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -3,7 +3,7 @@
*
* Copyright (C) 2017 Tony Lindgren <t...@atomide.com>
*
- * Some parts of the code based on earlie Motorola mapphone Linux kernel
+ * Some parts of the code based on earlier Motorola mapphone Linux kernel
* drivers:
*
* Copyright (C) 2009-2010 Motorola, Inc.
diff --git a/drivers/power/supply/cpcap-charger.c
b/drivers/power/supply/cpcap-charger.c
index e4905be..7de07ae 100644
--- a/drivers/power/supply/cpcap-charger.c
+++ b/drivers/power/supply/cpcap-charger.c
@@ -93,6 +93,17 @@
#define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe)
#define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf)
+static int voltage_to_register(int microvolt)
+{
+ switch (microvolt/1000) {
+ case 3800: return CPCAP_REG_CRM_VCHRG_3V80;
+ case 4100: return CPCAP_REG_CRM_VCHRG_4V10;
+ case 4200: return CPCAP_REG_CRM_VCHRG_4V20;
+ case 4350: return CPCAP_REG_CRM_VCHRG_4V35;
+ default: return -EINVAL;
+ }
+}
+
/*
* CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
* values in "Table 8-3. Charge Path Regulator Current Limit
@@ -116,6 +127,18 @@
#define CPCAP_REG_CRM_ICHRG_1A596 CPCAP_REG_CRM_ICHRG(0xe)
#define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf)
+static int current_to_register(int microamp)
+{
+ switch (microamp/1000) {
+ case 0: return CPCAP_REG_CRM_ICHRG_0A000;
+ case 70: return CPCAP_REG_CRM_ICHRG_0A070;
+ case 177: return CPCAP_REG_CRM_ICHRG_0A177;
+ case 532: return CPCAP_REG_CRM_ICHRG_0A532;
+ case 1596: return CPCAP_REG_CRM_ICHRG_1A596;
+ default: return -EINVAL;
+ }
+}
+
enum {
CPCAP_CHARGER_IIO_BATTDET,
CPCAP_CHARGER_IIO_VOLTAGE,
@@ -142,6 +165,10 @@ struct cpcap_charger_ddata {
atomic_t active;
int status;
+
+ int led_enabled;
+ int limit_current;
+ int limit_voltage;
};
struct cpcap_interrupt_desc {
@@ -163,11 +190,17 @@ struct cpcap_charger_ints_state {
bool battdetb;
};
+#define POWER_SUPPLY_PROP_INDICATION POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT
+
static enum power_supply_property cpcap_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
+
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_INDICATION,
};
static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
@@ -229,6 +262,7 @@ static int cpcap_charger_get_property(struct power_supply
*psy,
val->intval = ddata->status;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ /* FIXME? Display voltage even when not charging? */
if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
val->intval = cpcap_charger_get_charge_voltage(ddata) *
1000;
@@ -245,6 +279,50 @@ static int cpcap_charger_get_property(struct power_supply
*psy,
case POWER_SUPPLY_PROP_ONLINE:
val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ // -> charger -- current limit
+ val->intval = ddata->limit_current;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ val->intval = ddata->limit_voltage;
+ break;
+ case POWER_SUPPLY_PROP_INDICATION:
+ val->intval = ddata->led_enabled;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int cpcap_charger_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ printk("charge current: %d\n", val->intval);
+ if (current_to_register(val->intval) < 0)
+ return -EINVAL;
+ ddata->limit_current = val->intval;
+ schedule_delayed_work(&ddata->detect_work, 0);
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ printk("charge voltage: %d\n", val->intval);
+ if (voltage_to_register(val->intval) < 0)
+ return -EINVAL;
+ ddata->limit_voltage = val->intval;
+ schedule_delayed_work(&ddata->detect_work, 0);
+ break;
+ case POWER_SUPPLY_PROP_INDICATION:
+ printk("hack indication: %d\n", val->intval);
+ ddata->led_enabled = !!val->intval;
+ schedule_delayed_work(&ddata->detect_work, 0);
+ break;
default:
return -EINVAL;
}
@@ -296,7 +374,7 @@ static int cpcap_charger_set_state(struct
cpcap_charger_ddata *ddata,
}
error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
- CPCAP_REG_CRM_CHRG_LED_EN |
+ ddata->led_enabled *
CPCAP_REG_CRM_CHRG_LED_EN |
trickle_current |
CPCAP_REG_CRM_FET_OVRD |
CPCAP_REG_CRM_FET_CTRL |
@@ -440,16 +518,38 @@ static void cpcap_usb_detect(struct work_struct *work)
return;
if (cpcap_charger_vbus_valid(ddata) && s.chrgcurr1) {
- int max_current;
+ int m_voltage, m_current;
+ int reg_current, reg_voltage;
if (cpcap_charger_battery_found(ddata))
- max_current = CPCAP_REG_CRM_ICHRG_1A596;
+ m_current = 1596000;
else
- max_current = CPCAP_REG_CRM_ICHRG_0A532;
+ m_current = 532000;
+
+ if (m_current > ddata->limit_current)
+ m_current = ddata->limit_current;
+
+ m_voltage = 4350000;
+ if (m_voltage > ddata->limit_voltage)
+ m_voltage = ddata->limit_voltage;
+
+ printk("Charging, %d uV, %d uA\n", m_voltage, m_current);
+
+ reg_voltage = voltage_to_register(m_voltage);
+ if (reg_voltage < 0) {
+ dev_err(ddata->dev, "%s impossible voltage\n",
__func__);
+ return;
+ }
+
+ reg_current = current_to_register(m_current);
+ if (reg_current < 0) {
+ dev_err(ddata->dev, "%s impossible current\n",
__func__);
+ return;
+ }
error = cpcap_charger_set_state(ddata,
- CPCAP_REG_CRM_VCHRG_4V35,
- max_current, 0);
+ reg_voltage,
+ reg_current, 0);
if (error)
goto out_err;
} else {
@@ -579,12 +679,27 @@ static int cpcap_charger_init_iio(struct
cpcap_charger_ddata *ddata)
return error;
}
+static int cpcap_charger_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ case POWER_SUPPLY_PROP_INDICATION:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
static const struct power_supply_desc cpcap_charger_usb_desc = {
.name = "usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = cpcap_charger_props,
.num_properties = ARRAY_SIZE(cpcap_charger_props),
.get_property = cpcap_charger_get_property,
+ .set_property = cpcap_charger_set_property,
+ .property_is_writeable = cpcap_charger_property_is_writeable,
};
#ifdef CONFIG_OF
@@ -619,6 +734,10 @@ static int cpcap_charger_probe(struct platform_device
*pdev)
if (!ddata->reg)
return -ENODEV;
+ ddata->limit_current = 1596000;
+ ddata->limit_voltage = 4350000;
+ ddata->led_enabled = 1;
+
INIT_LIST_HEAD(&ddata->irq_list);
INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures)
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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