[PATCH v1 1/1] i2c: scmi: Convert to be a platform driver

Andy Shevchenko
2022-09-06T16:24:33Z

ACPI core in conjunction with platform driver core provides
an infrastructure to enumerate ACPI devices. Use it in order
to remove a lot of boilerplate code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/i2c/busses/i2c-scmi.c | 48 ++++++++++++++---------------------
1 file changed, 19 insertions(+), 29 deletions(-)

diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c
index 6746aa46d96c..0239e134b90f 100644
--- a/drivers/i2c/busses/i2c-scmi.c
+++ b/drivers/i2c/busses/i2c-scmi.c
@@ -6,15 +6,13 @@
*/

#include <linux/module.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/i2c.h>
#include <linux/acpi.h>

-#define ACPI_SMBUS_HC_CLASS "smbus"
-#define ACPI_SMBUS_HC_DEVICE_NAME "cmi"
-
/* SMBUS HID definition as supported by Microsoft Windows */
#define ACPI_SMBUS_MS_HID "SMB0001"

@@ -30,7 +28,7 @@ struct acpi_smbus_cmi {
u8 cap_info:1;
u8 cap_read:1;
u8 cap_write:1;
- struct smbus_methods_t *methods;
+ const struct smbus_methods_t *methods;
};

static const struct smbus_methods_t smbus_methods = {
@@ -358,29 +356,25 @@ static acpi_status acpi_smbus_cmi_query_methods(acpi_handle handle, u32 level,
return AE_OK;
}

-static int acpi_smbus_cmi_add(struct acpi_device *device)
+static int smbus_cmi_probe(struct platform_device *device)
{
+ struct device *dev = &device->dev;
struct acpi_smbus_cmi *smbus_cmi;
- const struct acpi_device_id *id;
int ret;

smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);
if (!smbus_cmi)
return -ENOMEM;

- smbus_cmi->handle = device->handle;
- strcpy(acpi_device_name(device), ACPI_SMBUS_HC_DEVICE_NAME);
- strcpy(acpi_device_class(device), ACPI_SMBUS_HC_CLASS);
- device->driver_data = smbus_cmi;
+ smbus_cmi->handle = ACPI_HANDLE(dev);
+ smbus_cmi->methods = device_get_match_data(dev);
+
+ platform_set_drvdata(device, smbus_cmi);
+
smbus_cmi->cap_info = 0;
smbus_cmi->cap_read = 0;
smbus_cmi->cap_write = 0;

- for (id = acpi_smbus_cmi_ids; id->id[0]; id++)
- if (!strcmp(id->id, acpi_device_hid(device)))
- smbus_cmi->methods =
- (struct smbus_methods_t *) id->driver_data;
-
acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,
acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);

@@ -390,8 +384,7 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
}

snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name),
- "SMBus CMI adapter %s",
- acpi_device_name(device));
+ "SMBus CMI adapter %s", dev_name(dev));
smbus_cmi->adapter.owner = THIS_MODULE;
smbus_cmi->adapter.algo = &acpi_smbus_cmi_algorithm;
smbus_cmi->adapter.algo_data = smbus_cmi;
@@ -408,31 +401,28 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)

err:
kfree(smbus_cmi);
- device->driver_data = NULL;
return ret;
}

-static int acpi_smbus_cmi_remove(struct acpi_device *device)
+static int smbus_cmi_remove(struct platform_device *device)
{
- struct acpi_smbus_cmi *smbus_cmi = acpi_driver_data(device);
+ struct acpi_smbus_cmi *smbus_cmi = platform_get_drvdata(device);

i2c_del_adapter(&smbus_cmi->adapter);
kfree(smbus_cmi);
- device->driver_data = NULL;

return 0;
}

-static struct acpi_driver acpi_smbus_cmi_driver = {
- .name = ACPI_SMBUS_HC_DEVICE_NAME,
- .class = ACPI_SMBUS_HC_CLASS,
- .ids = acpi_smbus_cmi_ids,
- .ops = {
- .add = acpi_smbus_cmi_add,
- .remove = acpi_smbus_cmi_remove,
+static struct platform_driver smbus_cmi_driver = {
+ .probe = smbus_cmi_probe,
+ .remove = smbus_cmi_remove,
+ .driver = {
+ .name = "smbus_cmi",
+ .acpi_match_table = acpi_smbus_cmi_ids,
},
};
-module_acpi_driver(acpi_smbus_cmi_driver);
+module_platform_driver(smbus_cmi_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Crane Cai <crane.cai@amd.com>");
--
2.35.1