[PATCH 1/2] max8903: adds support for initiation via device tree.
From: chris
Date: Thu Jun 02 2016 - 02:46:01 EST
From: Chris Lapa <chris@xxxxxxxxxxx>
This commit also adds requesting gpio's via devm_gpio_request() to ensure
the gpio is available for usage by the driver.
Signed-off-by: Chris Lapa <chris@xxxxxxxxxxx>
---
.../devicetree/bindings/power/max8903-charger.txt | 28 ++
drivers/power/max8903_charger.c | 281 ++++++++++++++++-----
2 files changed, 250 insertions(+), 59 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power/max8903-charger.txt
diff --git a/Documentation/devicetree/bindings/power/max8903-charger.txt b/Documentation/devicetree/bindings/power/max8903-charger.txt
new file mode 100644
index 0000000..7207731
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/max8903-charger.txt
@@ -0,0 +1,28 @@
+Maxim Semiconductor MAX8903 Battery Charger bindings
+
+Required properties:
+- compatible: "max8903-charger" for MAX8903 Battery Charger
+- dc_valid:
+ - dok: DC power OK pin
+- usb_valid:
+ - uok: USB power OK pin
+
+Optional properties:
+- cen: Charge enable pin
+- chg: Charger status pin
+- flt: Fault pin
+- dcm: Current limit mode setting (DC or USB)
+- usus: USB suspend pin
+
+
+Example:
+
+ max8903-charger {
+ compatible = "max8903-charger";
+ dok = <&gpio2 3 GPIO_ACTIVE_LOW>;
+ flt = <&gpio2 2 GPIO_ACTIVE_LOW>;
+ chg = <&gpio3 15 GPIO_ACTIVE_LOW>;
+ cen = <&gpio2 5 GPIO_ACTIVE_LOW>;
+ dc_valid;
+ status = "okay";
+ };
diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
index 17876ca..1989c10 100644
--- a/drivers/power/max8903_charger.c
+++ b/drivers/power/max8903_charger.c
@@ -23,13 +23,16 @@
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/power_supply.h>
#include <linux/platform_device.h>
#include <linux/power/max8903_charger.h>
struct max8903_data {
- struct max8903_pdata pdata;
+ struct max8903_pdata *pdata;
struct device *dev;
struct power_supply *psy;
struct power_supply_desc psy_desc;
@@ -53,8 +56,8 @@ static int max8903_get_property(struct power_supply *psy,
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
- if (data->pdata.chg) {
- if (gpio_get_value(data->pdata.chg) == 0)
+ if (data->pdata->chg) {
+ if (gpio_get_value(data->pdata->chg) == 0)
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else if (data->usb_in || data->ta_in)
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
@@ -75,13 +78,14 @@ static int max8903_get_property(struct power_supply *psy,
default:
return -EINVAL;
}
+
return 0;
}
static irqreturn_t max8903_dcin(int irq, void *_data)
{
struct max8903_data *data = _data;
- struct max8903_pdata *pdata = &data->pdata;
+ struct max8903_pdata *pdata = data->pdata;
bool ta_in;
enum power_supply_type old_type;
@@ -122,7 +126,7 @@ static irqreturn_t max8903_dcin(int irq, void *_data)
static irqreturn_t max8903_usbin(int irq, void *_data)
{
struct max8903_data *data = _data;
- struct max8903_pdata *pdata = &data->pdata;
+ struct max8903_pdata *pdata = data->pdata;
bool usb_in;
enum power_supply_type old_type;
@@ -161,7 +165,7 @@ static irqreturn_t max8903_usbin(int irq, void *_data)
static irqreturn_t max8903_fault(int irq, void *_data)
{
struct max8903_data *data = _data;
- struct max8903_pdata *pdata = &data->pdata;
+ struct max8903_pdata *pdata = data->pdata;
bool fault;
fault = gpio_get_value(pdata->flt) ? false : true;
@@ -179,34 +183,135 @@ static irqreturn_t max8903_fault(int irq, void *_data)
return IRQ_HANDLED;
}
+static struct max8903_pdata *max8903_parse_dt_data(
+ struct device *dev)
+{
+ struct device_node *of_node = dev->of_node;
+ struct max8903_pdata *pdata = NULL;
+
+ if (!of_node) {
+ return pdata;
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(struct max8903_pdata),
+ GFP_KERNEL);
+ if (!pdata) {
+ return pdata;
+ }
+
+ if (of_get_property(of_node, "dc_valid", NULL)) {
+ pdata->dc_valid = true;
+ }
+
+ if (of_get_property(of_node, "usb_valid", NULL)) {
+ pdata->usb_valid = true;
+ }
+
+ pdata->cen = of_get_named_gpio(of_node, "cen", 0);
+ if (!gpio_is_valid(pdata->cen)) {
+ pdata->cen = 0;
+ }
+
+ pdata->chg = of_get_named_gpio(of_node, "chg", 0);
+ if (!gpio_is_valid(pdata->chg)) {
+ pdata->chg = 0;
+ }
+
+ pdata->flt = of_get_named_gpio(of_node, "flt", 0);
+ if (!gpio_is_valid(pdata->flt)) {
+ pdata->flt = 0;
+ }
+
+ pdata->usus = of_get_named_gpio(of_node, "usus", 0);
+ if (!gpio_is_valid(pdata->usus)) {
+ pdata->usus = 0;
+ }
+
+ pdata->dcm = of_get_named_gpio(of_node, "dcm", 0);
+ if (!gpio_is_valid(pdata->dcm)) {
+ pdata->dcm = 0;
+ }
+
+ pdata->dok = of_get_named_gpio(of_node, "dok", 0);
+ if (!gpio_is_valid(pdata->dok)) {
+ pdata->dok = 0;
+ }
+
+ pdata->uok = of_get_named_gpio(of_node, "uok", 0);
+ if (!gpio_is_valid(pdata->uok)) {
+ pdata->uok = 0;
+ }
+
+ return pdata;
+}
+
static int max8903_probe(struct platform_device *pdev)
{
- struct max8903_data *data;
+ struct max8903_data *charger;
struct device *dev = &pdev->dev;
- struct max8903_pdata *pdata = pdev->dev.platform_data;
struct power_supply_config psy_cfg = {};
int ret = 0;
int gpio;
int ta_in = 0;
int usb_in = 0;
- data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
- if (data == NULL) {
+ charger = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
+ if (charger == NULL) {
dev_err(dev, "Cannot allocate memory.\n");
return -ENOMEM;
}
- memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
- data->dev = dev;
- platform_set_drvdata(pdev, data);
- if (pdata->dc_valid == false && pdata->usb_valid == false) {
+ charger->pdata = pdev->dev.platform_data;
+ if (IS_ENABLED(CONFIG_OF) && !charger->pdata && dev->of_node) {
+ charger->pdata = max8903_parse_dt_data(dev);
+ if (!charger->pdata)
+ return -EINVAL;
+ }
+
+ charger->dev = dev;
+
+ platform_set_drvdata(pdev, charger);
+
+ charger->fault = false;
+ charger->ta_in = ta_in;
+ charger->usb_in = usb_in;
+
+ charger->psy_desc.name = "max8903_charger";
+ charger->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
+ ((usb_in) ? POWER_SUPPLY_TYPE_USB :
+ POWER_SUPPLY_TYPE_BATTERY);
+ charger->psy_desc.get_property = max8903_get_property;
+ charger->psy_desc.properties = max8903_charger_props;
+ charger->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
+
+ if (charger->pdata->dc_valid == false && charger->pdata->usb_valid == false) {
dev_err(dev, "No valid power sources.\n");
return -EINVAL;
}
- if (pdata->dc_valid) {
- if (pdata->dok && gpio_is_valid(pdata->dok) &&
- pdata->dcm && gpio_is_valid(pdata->dcm)) {
+ if (charger->pdata->dc_valid) {
+ if (charger->pdata->dok && gpio_is_valid(charger->pdata->dok) &&
+ charger->pdata->dcm && gpio_is_valid(charger->pdata->dcm)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->dok,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for dok: %d err %d\n",
+ charger->pdata->dok, ret);
+ return -EINVAL;
+ }
+
+ ret = devm_gpio_request(dev,
+ charger->pdata->dcm,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for dcm: %d err %d\n",
+ charger->pdata->dcm, ret);
+ return -EINVAL;
+ }
+
gpio = pdata->dok; /* PULL_UPed Interrupt */
ta_in = gpio_get_value(gpio) ? 0 : 1;
@@ -219,18 +324,38 @@ static int max8903_probe(struct platform_device *pdev)
}
} else {
if (pdata->dcm) {
- if (gpio_is_valid(pdata->dcm))
+ if (gpio_is_valid(pdata->dcm)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->dcm,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for dcm: %d err %d\n",
+ charger->pdata->dcm, ret);
+ return -EINVAL;
+ }
+
gpio_set_value(pdata->dcm, 0);
- else {
+ } else {
dev_err(dev, "Invalid pin: dcm.\n");
return -EINVAL;
}
}
}
- if (pdata->usb_valid) {
- if (pdata->uok && gpio_is_valid(pdata->uok)) {
- gpio = pdata->uok;
+ if (charger->pdata->usb_valid) {
+ if (gpio_is_valid(charger->pdata->uok)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->uok,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for uok: %d err %d\n",
+ charger->pdata->uok, ret);
+ return -EINVAL;
+ }
+
+ gpio = charger->pdata->uok;
usb_in = gpio_get_value(gpio) ? 0 : 1;
} else {
dev_err(dev, "When USB is wired, UOK should be wired."
@@ -239,91 +364,122 @@ static int max8903_probe(struct platform_device *pdev)
}
}
- if (pdata->cen) {
- if (gpio_is_valid(pdata->cen)) {
- gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
+ if (charger->pdata->cen) {
+ if (gpio_is_valid(charger->pdata->cen)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->cen,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for cen: %d err %d\n",
+ charger->pdata->cen, ret);
+ return -EINVAL;
+ }
+
+ gpio_set_value(charger->pdata->cen, (ta_in || usb_in) ? 0 : 1);
} else {
dev_err(dev, "Invalid pin: cen.\n");
return -EINVAL;
}
}
- if (pdata->chg) {
- if (!gpio_is_valid(pdata->chg)) {
+ if (charger->pdata->chg) {
+ if (gpio_is_valid(charger->pdata->chg)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->chg,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for chg: %d err %d\n",
+ charger->pdata->chg, ret);
+ return -EINVAL;
+ }
+ } else {
dev_err(dev, "Invalid pin: chg.\n");
return -EINVAL;
}
}
- if (pdata->flt) {
- if (!gpio_is_valid(pdata->flt)) {
+ if (charger->pdata->flt) {
+ if (gpio_is_valid(charger->pdata->flt)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->flt,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for flt: %d err %d\n",
+ charger->pdata->flt, ret);
+ return -EINVAL;
+ }
+ } else {
dev_err(dev, "Invalid pin: flt.\n");
return -EINVAL;
}
}
- if (pdata->usus) {
- if (!gpio_is_valid(pdata->usus)) {
+ if (charger->pdata->usus) {
+ if (gpio_is_valid(charger->pdata->usus)) {
+ ret = devm_gpio_request(dev,
+ charger->pdata->usus,
+ charger->psy_desc.name);
+ if (ret) {
+ dev_err(dev,
+ "Failed GPIO request for usus: %d err %d\n",
+ charger->pdata->usus, ret);
+ return -EINVAL;
+ }
+ } else {
dev_err(dev, "Invalid pin: usus.\n");
return -EINVAL;
}
}
- data->fault = false;
- data->ta_in = ta_in;
- data->usb_in = usb_in;
-
- data->psy_desc.name = "max8903_charger";
- data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
- ((usb_in) ? POWER_SUPPLY_TYPE_USB :
- POWER_SUPPLY_TYPE_BATTERY);
- data->psy_desc.get_property = max8903_get_property;
- data->psy_desc.properties = max8903_charger_props;
- data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
-
- psy_cfg.drv_data = data;
+ psy_cfg.supplied_to = NULL;
+ psy_cfg.num_supplicants = 0;
+ psy_cfg.of_node = dev->of_node;
+ psy_cfg.drv_data = charger;
- data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
- if (IS_ERR(data->psy)) {
+ charger->psy = devm_power_supply_register(dev, &charger->psy_desc, &psy_cfg);
+ if (IS_ERR(charger->psy)) {
dev_err(dev, "failed: power supply register.\n");
- return PTR_ERR(data->psy);
+ return PTR_ERR(charger->psy);
}
- if (pdata->dc_valid) {
- ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
+ if (charger->pdata->dc_valid) {
+ ret = devm_request_threaded_irq(dev, gpio_to_irq(charger->pdata->dok),
NULL, max8903_dcin,
IRQF_TRIGGER_FALLING |
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- "MAX8903 DC IN", data);
+ "MAX8903 DC IN", charger);
if (ret) {
dev_err(dev, "Cannot request irq %d for DC (%d)\n",
- gpio_to_irq(pdata->dok), ret);
+ gpio_to_irq(charger->pdata->dok), ret);
return ret;
}
}
- if (pdata->usb_valid) {
- ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
+ if (charger->pdata->usb_valid) {
+ ret = devm_request_threaded_irq(dev, gpio_to_irq(charger->pdata->uok),
NULL, max8903_usbin,
IRQF_TRIGGER_FALLING |
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- "MAX8903 USB IN", data);
+ "MAX8903 USB IN", charger);
if (ret) {
dev_err(dev, "Cannot request irq %d for USB (%d)\n",
- gpio_to_irq(pdata->uok), ret);
+ gpio_to_irq(charger->pdata->uok), ret);
return ret;
}
}
- if (pdata->flt) {
- ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
+ if (charger->pdata->flt) {
+ ret = devm_request_threaded_irq(dev, gpio_to_irq(charger->pdata->flt),
NULL, max8903_fault,
IRQF_TRIGGER_FALLING |
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- "MAX8903 Fault", data);
+ "MAX8903 Fault", charger);
if (ret) {
dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
- gpio_to_irq(pdata->flt), ret);
+ gpio_to_irq(charger->pdata->flt), ret);
return ret;
}
}
@@ -331,10 +487,17 @@ static int max8903_probe(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id max8903_match_ids[] = {
+ { .compatible = "max8903-charger", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, max8903_match_ids);
+
static struct platform_driver max8903_driver = {
.probe = max8903_probe,
.driver = {
.name = "max8903-charger",
+ .of_match_table = max8903_match_ids
},
};
--
1.9.1