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Subject[RESEND][PATCH 3/4] drivers: tee: rework optee_driver_{init,exit} to use platform device
Date
Now that of_platform_default_populate_init() takes care of populating
all the devices under the /firmware/ node, this patch reworks/removes
custom optee_driver_{init,exit} in favour of module_platform_driver.

Cc: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/tee/optee/core.c | 74 ++++++++++++++++--------------------------------
1 file changed, 25 insertions(+), 49 deletions(-)

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 7952357df9c8..98be0e688949 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -446,8 +446,9 @@ static optee_invoke_fn *get_invoke_func(struct device_node *np)
return ERR_PTR(-EINVAL);
}

-static struct optee *optee_probe(struct device_node *np)
+static int optee_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
optee_invoke_fn *invoke_fn;
struct tee_shm_pool *pool;
struct optee *optee = NULL;
@@ -458,21 +459,21 @@ static struct optee *optee_probe(struct device_node *np)

invoke_fn = get_invoke_func(np);
if (IS_ERR(invoke_fn))
- return (void *)invoke_fn;
+ return PTR_ERR(invoke_fn);

if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
pr_warn("api uid mismatch\n");
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
pr_warn("api revision mismatch\n");
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
pr_warn("capabilities mismatch\n");
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

/*
@@ -480,11 +481,11 @@ static struct optee *optee_probe(struct device_node *np)
* doesn't have any reserved memory we can use we can't continue.
*/
if (!(sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
- return ERR_PTR(-EINVAL);
+ return -EINVAL;

pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
if (IS_ERR(pool))
- return (void *)pool;
+ return PTR_ERR(pool);

optee = kzalloc(sizeof(*optee), GFP_KERNEL);
if (!optee) {
@@ -524,9 +525,10 @@ static struct optee *optee_probe(struct device_node *np)
optee->pool = pool;

optee_enable_shm_cache(optee);
+ platform_set_drvdata(pdev, optee);

pr_info("initialized driver\n");
- return optee;
+ return 0;
err:
if (optee) {
/*
@@ -542,11 +544,12 @@ static struct optee *optee_probe(struct device_node *np)
tee_shm_pool_free(pool);
if (memremaped_shm)
memunmap(memremaped_shm);
- return ERR_PTR(rc);
+ return rc;
}

-static void optee_remove(struct optee *optee)
+static int optee_remove(struct platform_device *pdev)
{
+ struct optee *optee = platform_get_drvdata(pdev);
/*
* Ask OP-TEE to free all cached shared memory objects to decrease
* reference counters and also avoid wild pointers in secure world
@@ -569,52 +572,25 @@ static void optee_remove(struct optee *optee)
mutex_destroy(&optee->call_queue.mutex);

kfree(optee);
+ return 0;
}

static const struct of_device_id optee_match[] = {
{ .compatible = "linaro,optee-tz" },
{},
};
+MODULE_DEVICE_TABLE(of, optee_match);
+
+static struct platform_driver optee_platdrv = {
+ .driver = {
+ .name = "optee",
+ .of_match_table = of_match_ptr(optee_match),
+ },
+ .probe = optee_probe,
+ .remove = optee_remove,
+};

-static struct optee *optee_svc;
-
-static int __init optee_driver_init(void)
-{
- struct device_node *fw_np;
- struct device_node *np;
- struct optee *optee;
-
- /* Node is supposed to be below /firmware */
- fw_np = of_find_node_by_name(NULL, "firmware");
- if (!fw_np)
- return -ENODEV;
-
- np = of_find_matching_node(fw_np, optee_match);
- of_node_put(fw_np);
- if (!np)
- return -ENODEV;
-
- optee = optee_probe(np);
- of_node_put(np);
-
- if (IS_ERR(optee))
- return PTR_ERR(optee);
-
- optee_svc = optee;
-
- return 0;
-}
-module_init(optee_driver_init);
-
-static void __exit optee_driver_exit(void)
-{
- struct optee *optee = optee_svc;
-
- optee_svc = NULL;
- if (optee)
- optee_remove(optee);
-}
-module_exit(optee_driver_exit);
+module_platform_driver(optee_platdrv);

MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");
--
2.7.4
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