Hi,
The solution here add and option to use max17042 driver as a MFD
sub device, thus allowing any additional functionality be implemented as
another sub device. This will help to reduce code duplication in MFD
fuel gauge drivers.
Signed-off-by: Dzmitry Sankouski <dsankouski@xxxxxxxxx>
---
Changes in v4:
- rename module_init and module_exit fuctions
- rework max17042_init
- assign chip_type in probe function
- pass i2c_client as pointer on pointer, to use same pointer created in
MFD. This allows devm_regmap_init_i2c to cleanup gracefully.
Changes in v3:
- pass dev pointer in max17042_probe
- remove prints
---
drivers/power/supply/max17042_battery.c | 116 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------
1 file changed, 92 insertions(+), 24 deletions(-)
diff --git a/drivers/power/supply/max17042_battery.c b/drivers/power/supply/max17042_battery.c
index 99bf6915aa23..6a1bfc4a7b13 100644
--- a/drivers/power/supply/max17042_battery.c
+++ b/drivers/power/supply/max17042_battery.c
@@ -16,6 +16,7 @@
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
+#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
@@ -1029,14 +1030,12 @@ static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
.num_properties = ARRAY_SIZE(max17042_battery_props) - 2,
};
-static int max17042_probe(struct i2c_client *client)
+static int max17042_probe(struct i2c_client *client, struct device *dev,
+ enum max170xx_chip_type chip_type)
{
- const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct i2c_adapter *adapter = client->adapter;
const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
struct power_supply_config psy_cfg = {};
- const struct acpi_device_id *acpi_id = NULL;
- struct device *dev = &client->dev;
struct max17042_chip *chip;
int ret;
int i;
@@ -1045,33 +1044,25 @@ static int max17042_probe(struct i2c_client *client)
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
return -EIO;
- chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
- if (id) {
- chip->chip_type = id->driver_data;
- } else {
- acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
- if (!acpi_id)
- return -ENODEV;
-
- chip->chip_type = acpi_id->driver_data;
- }
+ chip->chip_type = chip_type;
chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
if (IS_ERR(chip->regmap)) {
- dev_err(&client->dev, "Failed to initialize regmap\n");
+ dev_err(dev, "Failed to initialize regmap\n");
return -EINVAL;
}
chip->pdata = max17042_get_pdata(chip);
if (!chip->pdata) {
- dev_err(&client->dev, "no platform data provided\n");
+ dev_err(dev, "no platform data provided\n");
return -EINVAL;
}
- i2c_set_clientdata(client, chip);
+ dev_set_drvdata(dev, chip);
psy_cfg.drv_data = chip;
psy_cfg.of_node = dev->of_node;
@@ -1095,17 +1086,17 @@ static int max17042_probe(struct i2c_client *client)
regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
}
- chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
+ chip->battery = devm_power_supply_register(dev, max17042_desc,
&psy_cfg);
if (IS_ERR(chip->battery)) {
- dev_err(&client->dev, "failed: power supply register\n");
+ dev_err(dev, "failed: power supply register\n");
return PTR_ERR(chip->battery);
}
if (client->irq) {
unsigned int flags = IRQF_ONESHOT | IRQF_SHARED | IRQF_PROBE_SHARED;
- ret = devm_request_threaded_irq(&client->dev, client->irq,
+ ret = devm_request_threaded_irq(dev, client->irq,
NULL,
max17042_thread_handler, flags,
chip->battery->desc->name,
@@ -1118,7 +1109,7 @@ static int max17042_probe(struct i2c_client *client)
} else {
client->irq = 0;
if (ret != -EBUSY)
- dev_err(&client->dev, "Failed to get IRQ\n");
+ dev_err(dev, "Failed to get IRQ\n");
}
}
/* Not able to update the charge threshold when exceeded? -> disable */
@@ -1127,7 +1118,7 @@ static int max17042_probe(struct i2c_client *client)
regmap_read(chip->regmap, MAX17042_STATUS, &val);
if (val & STATUS_POR_BIT) {
- ret = devm_work_autocancel(&client->dev, &chip->work,
+ ret = devm_work_autocancel(dev, &chip->work,
max17042_init_worker);
if (ret)
return ret;
@@ -1139,6 +1130,38 @@ static int max17042_probe(struct i2c_client *client)
return 0;
}
+static int max17042_i2c_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ const struct acpi_device_id *acpi_id = NULL;
+ struct device *dev = &client->dev;
+ enum max170xx_chip_type chip_type;
+
+ if (id) {
+ chip_type = id->driver_data;
+ } else {
+ acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!acpi_id)
+ return -ENODEV;
+
+ chip_type = acpi_id->driver_data;
+ }
+
+ return max17042_probe(client, dev, chip_type);
+}
+
+static int max17042_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct i2c_client **i2c = dev_get_platdata(dev);
This seems a bit unusual; can't we just use:
struct i2c_client *i2c = dev_get_platdata(&pdev->dev); instead?
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+
+ if (!i2c)
+ return -EINVAL;
+
+ return max17042_probe(*i2c, dev, id->driver_data);
and then just pass "i2c" here ?
+}
+
#ifdef CONFIG_PM_SLEEP
static int max17042_suspend(struct device *dev)
{
@@ -1204,6 +1227,16 @@ static const struct i2c_device_id max17042_id[] = {
};
MODULE_DEVICE_TABLE(i2c, max17042_id);
+static const struct platform_device_id max17042_platform_id[] = {
+ { "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
+ { "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
+ { "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
+ { "max17055", MAXIM_DEVICE_TYPE_MAX17055 },
+ { "max77849-battery", MAXIM_DEVICE_TYPE_MAX17047 },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max17042_platform_id);
+
static struct i2c_driver max17042_i2c_driver = {
.driver = {
.name = "max17042",
@@ -1211,10 +1244,45 @@ static struct i2c_driver max17042_i2c_driver = {
.of_match_table = of_match_ptr(max17042_dt_match),
.pm = &max17042_pm_ops,
},
- .probe = max17042_probe,
+ .probe = max17042_i2c_probe,
.id_table = max17042_id,
};
-module_i2c_driver(max17042_i2c_driver);
+
+static struct platform_driver max17042_platform_driver = {
+ .driver = {
+ .name = "max17042",
+ .acpi_match_table = ACPI_PTR(max17042_acpi_match),
+ .of_match_table = of_match_ptr(max17042_dt_match),
+ .pm = &max17042_pm_ops,
+ },
+ .probe = max17042_platform_probe,
+ .id_table = max17042_platform_id,
+};
+
+static int __init max17042_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&max17042_platform_driver);
+ if (ret)
+ return ret;
+
+ ret = i2c_add_driver(&max17042_i2c_driver);
+ if (ret) {
+ platform_driver_unregister(&max17042_platform_driver);
+ return ret;
+ }
+
+ return 0;
+}
+module_init(max17042_init);
+
+static void __exit max17042_exit(void)
+{
+ i2c_del_driver(&max17042_i2c_driver);
+ platform_driver_unregister(&max17042_platform_driver);
+}
+module_exit(max17042_exit);
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>");
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
--
2.39.5
