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platform/x86: i2c-multi-instantiate: Count I2cSerialBus() resources 

Instead of relying on hard coded and thus expected number of I2C clients,
count the real amount provided by firmware.

This allows to support non-fixed amount of the slaves.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
hifive-unleashed-5.1
Andy Shevchenko 2018-11-28 13:45:30 +02:00
parent 0d5102fe85
commit a729656697
1 changed files with 37 additions and 4 deletions
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41
drivers/platform/x86/i2c-multi-instantiate.c
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@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>
struct i2c_inst_data {
const char *type;
@ -23,6 +24,31 @@ struct i2c_multi_inst_data {
struct i2c_client *clients[0];
};
static int i2c_multi_inst_count(struct acpi_resource *ares, void *data)
{
struct acpi_resource_i2c_serialbus *sb;
int *count = data;
if (i2c_acpi_get_i2c_resource(ares, &sb))
*count = *count + 1;
return 1;
}
static int i2c_multi_inst_count_resources(struct acpi_device *adev)
{
LIST_HEAD(r);
int count = 0;
int ret;
ret = acpi_dev_get_resources(adev, &r, i2c_multi_inst_count, &count);
if (ret < 0)
return ret;
acpi_dev_free_resource_list(&r);
return count;
}
static int i2c_multi_inst_probe(struct platform_device *pdev)
{
struct i2c_multi_inst_data *multi;
@ -44,17 +70,19 @@ static int i2c_multi_inst_probe(struct platform_device *pdev)
adev = ACPI_COMPANION(dev);
/* Count number of clients to instantiate */
for (i = 0; inst_data[i].type; i++) {}
ret = i2c_multi_inst_count_resources(adev);
if (ret < 0)
return ret;
multi = devm_kmalloc(dev,
offsetof(struct i2c_multi_inst_data, clients[i]),
offsetof(struct i2c_multi_inst_data, clients[ret]),
GFP_KERNEL);
if (!multi)
return -ENOMEM;
multi->num_clients = i;
multi->num_clients = ret;
for (i = 0; i < multi->num_clients; i++) {
for (i = 0; i < multi->num_clients && inst_data[i].type; i++) {
memset(&board_info, 0, sizeof(board_info));
strlcpy(board_info.type, inst_data[i].type, I2C_NAME_SIZE);
snprintf(name, sizeof(name), "%s-%s", match->id,
@ -79,6 +107,11 @@ static int i2c_multi_inst_probe(struct platform_device *pdev)
goto error;
}
}
if (i < multi->num_clients) {
dev_err(dev, "Error finding driver, idx %d\n", i);
ret = -ENODEV;
goto error;
}
platform_set_drvdata(pdev, multi);
return 0;