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Message-Id: <1466375242-38354-8-git-send-email-chris@cpdesign.com.au>
Date: Mon, 20 Jun 2016 08:27:22 +1000
From: Chris Lapa <chris@...a.com.au>
To: k.kozlowski@...sung.com, dwmw2@...radead.org, dbaryshkov@...il.com,
sre@...nel.org, mark.rutland@....com, robh+dt@...nel.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org, Chris Lapa <chris@...a.com.au>
Subject: [PATCH v4 7/7] max8903: adds support for initiation via device tree
From: Chris Lapa <chris@...a.com.au>
Adds support for device tree to setup a max8903 battery charger. DC and USB
validity are determined by looking the presence of the dok and uok gpios.
Signed-off-by: Chris Lapa <chris@...a.com.au>
---
drivers/power/max8903_charger.c | 78 +++++++++++++++++++++++++++++++++++++----
1 file changed, 72 insertions(+), 6 deletions(-)
diff --git a/drivers/power/max8903_charger.c b/drivers/power/max8903_charger.c
index 9453bbf..47e3929 100644
--- a/drivers/power/max8903_charger.c
+++ b/drivers/power/max8903_charger.c
@@ -23,6 +23,9 @@
#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>
@@ -75,6 +78,7 @@ static int max8903_get_property(struct power_supply *psy,
default:
return -EINVAL;
}
+
return 0;
}
@@ -179,6 +183,56 @@ 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 *np = dev->of_node;
+ struct max8903_pdata *pdata = NULL;
+
+ if (!np)
+ return NULL;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ pdata->dc_valid = false;
+ pdata->usb_valid = false;
+
+ pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
+ if (!gpio_is_valid(pdata->cen))
+ pdata->cen = -EINVAL;
+
+ pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
+ if (!gpio_is_valid(pdata->chg))
+ pdata->chg = -EINVAL;
+
+ pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
+ if (!gpio_is_valid(pdata->flt))
+ pdata->flt = -EINVAL;
+
+ pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
+ if (!gpio_is_valid(pdata->usus))
+ pdata->usus = -EINVAL;
+
+ pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
+ if (!gpio_is_valid(pdata->dcm))
+ pdata->dcm = -EINVAL;
+
+ pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
+ if (!gpio_is_valid(pdata->dok))
+ pdata->dok = -EINVAL;
+ else
+ pdata->dc_valid = true;
+
+ pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
+ if (!gpio_is_valid(pdata->uok))
+ pdata->uok = -EINVAL;
+ else
+ pdata->usb_valid = true;
+
+ return pdata;
+}
+
static int max8903_setup_gpios(struct platform_device *pdev)
{
struct max8903_data *data = platform_get_drvdata(pdev);
@@ -298,16 +352,20 @@ static int max8903_probe(struct platform_device *pdev)
struct power_supply_config psy_cfg = {};
int ret = 0;
- if (pdata == NULL) {
- dev_err(dev, "No platform data.\n");
- return -EINVAL;
- }
-
data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- data->pdata = pdev->dev.platform_data;
+ if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
+ pdata = max8903_parse_dt_data(dev);
+
+ if (!pdata) {
+ dev_err(dev, "No platform data.\n");
+ return -EINVAL;
+ }
+
+ pdev->dev.platform_data = pdata;
+ data->pdata = pdata;
data->dev = dev;
platform_set_drvdata(pdev, data);
@@ -328,6 +386,7 @@ static int max8903_probe(struct platform_device *pdev)
data->psy_desc.properties = max8903_charger_props;
data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
+ psy_cfg.of_node = dev->of_node;
psy_cfg.drv_data = data;
data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
@@ -378,10 +437,17 @@ static int max8903_probe(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id max8903_match_ids[] = {
+ { .compatible = "maxim,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
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