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Message-ID: <1471848557-27278-7-git-send-email-wenyou.yang@atmel.com>
Date: Mon, 22 Aug 2016 14:49:16 +0800
From: Wenyou Yang <wenyou.yang@...el.com>
To: Sebastian Reichel <sre@...nel.org>,
Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Brown <broonie@...nel.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
"Kumar Gala" <galak@...eaurora.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Nicolas Ferre <nicolas.ferre@...el.com>,
<linux-pm@...r.kernel.org>, Wenyou Yang <wenyou.yang@...el.com>
Subject: [PATCH v7 6/7] power: act8945a_charger: Add max current property
Add the power supply's current max property,
POWER_SUPPLY_PROP_CURRENT_MAX.
Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
---
Changes in v7:
- For "chglev-gpios", use gpiod_get() to fix devm_gpiod_get() wrong use
with parent device as *dev argument.
- Add the handle -EPROBE_DEFER returned from gpiod_get "chglev_gpio".
- Remove unneeded semicolon.
Changes in v6:
- For "chglev-gpios", use gpiod API instead of old gpio API to handle.
Changes in v5: None
Changes in v4:
- Fix wrong gpio assignment for chglev_pin.
Changes in v3: None
Changes in v2: None
drivers/power/supply/act8945a_charger.c | 93 +++++++++++++++++++++++++++++----
1 file changed, 84 insertions(+), 9 deletions(-)
diff --git a/drivers/power/supply/act8945a_charger.c b/drivers/power/supply/act8945a_charger.c
index cc79abe..a40526c 100644
--- a/drivers/power/supply/act8945a_charger.c
+++ b/drivers/power/supply/act8945a_charger.c
@@ -13,7 +13,6 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
-#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
@@ -85,6 +84,7 @@ struct act8945a_charger {
bool init_done;
struct gpio_desc *lbo_gpio;
+ struct gpio_desc *chglev_gpio;
};
static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@@ -265,12 +265,80 @@ static int act8945a_get_capacity_level(struct act8945a_charger *charger,
return 0;
}
+#define MAX_CURRENT_USB_HIGH 450000
+#define MAX_CURRENT_USB_LOW 90000
+#define MAX_CURRENT_USB_PRE 45000
+/*
+ * Riset(K) = 2336 * (1V/Ichg(mA)) - 0.205
+ * Riset = 2.43K
+ */
+#define MAX_CURRENT_AC_HIGH 886527
+#define MAX_CURRENT_AC_LOW 117305
+#define MAX_CURRENT_AC_HIGH_PRE 88653
+#define MAX_CURRENT_AC_LOW_PRE 11731
+
+static int act8945a_get_current_max(struct act8945a_charger *charger,
+ struct regmap *regmap, int *val)
+{
+ int ret;
+ unsigned int status, state;
+ unsigned int acin_state;
+ int chgin_level = gpiod_get_value(charger->chglev_gpio);
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
+ if (ret < 0)
+ return ret;
+
+ acin_state = (state & APCH_STATE_ACINSTAT) >> 1;
+
+ state &= APCH_STATE_CSTATE;
+ state >>= APCH_STATE_CSTATE_SHIFT;
+
+ switch (state) {
+ case APCH_STATE_CSTATE_PRE:
+ if (acin_state) {
+ if (chgin_level)
+ *val = MAX_CURRENT_AC_HIGH_PRE;
+ else
+ *val = MAX_CURRENT_AC_LOW_PRE;
+ } else {
+ *val = MAX_CURRENT_USB_PRE;
+ }
+ break;
+ case APCH_STATE_CSTATE_FAST:
+ if (acin_state) {
+ if (chgin_level)
+ *val = MAX_CURRENT_AC_HIGH;
+ else
+ *val = MAX_CURRENT_AC_LOW;
+ } else {
+ if (chgin_level)
+ *val = MAX_CURRENT_USB_HIGH;
+ else
+ *val = MAX_CURRENT_USB_LOW;
+ }
+ break;
+ case APCH_STATE_CSTATE_EOC:
+ case APCH_STATE_CSTATE_DISABLED:
+ default:
+ *val = 0;
+ break;
+ }
+
+ return 0;
+}
+
static enum power_supply_property act8945a_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER
};
@@ -300,6 +368,10 @@ static int act8945a_charger_get_property(struct power_supply *psy,
ret = act8945a_get_capacity_level(charger,
regmap, &val->intval);
break;
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ ret = act8945a_get_current_max(charger,
+ regmap, &val->intval);
+ break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = act8945a_charger_model;
break;
@@ -390,13 +462,11 @@ static int act8945a_charger_config(struct device *dev,
struct act8945a_charger *charger)
{
struct device_node *np = dev->parent->of_node;
- enum of_gpio_flags flags;
struct regmap *regmap = charger->regmap;
u32 total_time_out;
u32 pre_time_out;
u32 input_voltage_threshold;
- int chglev_pin;
int ret;
unsigned int tmp;
@@ -431,12 +501,13 @@ static int act8945a_charger_config(struct device *dev,
if (ret)
dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
- chglev_pin = of_get_named_gpio_flags(np,
- "active-semi,chglev-gpios", 0, &flags);
-
- if (gpio_is_valid(chglev_pin)) {
- gpio_set_value(chglev_pin,
- ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
+ charger->chglev_gpio = gpiod_get(dev->parent,
+ "active-semi,chglev", GPIOD_IN);
+ if (PTR_ERR(charger->chglev_gpio) == -EPROBE_DEFER) {
+ dev_info(dev, "probe retry requested for gpio \"chglev\"\n");
+ } else if (IS_ERR(charger->chglev_gpio)) {
+ dev_err(dev, "unable to claim gpio \"chglev\"\n");
+ charger->chglev_gpio = NULL;
}
if (of_property_read_u32(np,
@@ -579,6 +650,8 @@ static int act8945a_charger_probe(struct platform_device *pdev)
fail:
if (charger->lbo_gpio)
gpiod_put(charger->lbo_gpio);
+ if (charger->chglev_gpio)
+ gpiod_put(charger->chglev_gpio);
return ret;
}
@@ -592,6 +665,8 @@ static int act8945a_charger_remove(struct platform_device *pdev)
if (charger->lbo_gpio)
gpiod_put(charger->lbo_gpio);
+ if (charger->chglev_gpio)
+ gpiod_put(charger->chglev_gpio);
return 0;
}
--
2.7.4
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