diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/platform/x86/i2c-multi-instantiate.c index 724535673089..d99bbaed0ca2 100644 --- a/drivers/platform/x86/i2c-multi-instantiate.c +++ b/drivers/platform/x86/i2c-multi-instantiate.c @@ -12,6 +12,7 @@ #include #include #include +#include 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;