soc/qcom/smem_state.c

17  * struct qcom_smem_state - state context
18  * @refcount:	refcount for the state
19  * @orphan:	boolean indicator that this state has been unregistered
21  * @of_node:	of_node to use for matching the state in DT
23  * @ops:	ops for the state
38  * qcom_smem_state_update_bits() - update the masked bits in state with value
39  * @state:	state handle acquired by calling qcom_smem_state_get()
45 int qcom_smem_state_update_bits(struct qcom_smem_state *state,
49 	if (state->orphan)
52 	if (!state->ops.update_bits)
55 	return state->ops.update_bits(state->priv, mask, value);
61 	struct qcom_smem_state *state;
65 	list_for_each_entry(state, &smem_states, list) {
66 		if (state->of_node == np) {
67 			kref_get(&state->refcount);
71 	state = ERR_PTR(-EPROBE_DEFER);
76 	return state;
80  * qcom_smem_state_get() - acquire handle to a state
82  * @con_id:	name of the state to lookup
83  * @bit:	flags from the state reference, indicating which bit's affected
85  * Returns handle to the state, or ERR_PTR(). qcom_smem_state_put() must be
86  * called to release the returned state handle.
92 	struct qcom_smem_state *state;
99 						 "qcom,smem-state-names",
102 			dev_err(dev, "missing qcom,smem-state-names\n");
109 					 "#qcom,smem-state-cells",
118 		dev_err(dev, "invalid #qcom,smem-state-cells\n");
122 	state = of_node_to_state(args.np);
123 	if (IS_ERR(state))
130 	return state;
136 	struct qcom_smem_state *state = container_of(ref, struct qcom_smem_state, refcount);
138 	list_del(&state->list);
139 	of_node_put(state->of_node);
140 	kfree(state);
144  * qcom_smem_state_put() - release state handle
145  * @state:	state handle to be released
147 void qcom_smem_state_put(struct qcom_smem_state *state)
150 	kref_put(&state->refcount, qcom_smem_state_release);
161  * devm_qcom_smem_state_get() - acquire handle to a devres managed state
163  * @con_id:	name of the state to lookup
164  * @bit:	flags from the state reference, indicating which bit's affected
166  * Returns handle to the state, or ERR_PTR(). qcom_smem_state_put() is called
173 	struct qcom_smem_state **ptr, *state;
179 	state = qcom_smem_state_get(dev, con_id, bit);
180 	if (!IS_ERR(state)) {
181 		*ptr = state;
187 	return state;
192  * qcom_smem_state_register() - register a new state
201 	struct qcom_smem_state *state;
203 	state = kzalloc(sizeof(*state), GFP_KERNEL);
204 	if (!state)
207 	kref_init(&state->refcount);
209 	state->of_node = of_node_get(of_node);
210 	state->ops = *ops;
211 	state->priv = priv;
214 	list_add(&state->list, &smem_states);
217 	return state;
222  * qcom_smem_state_unregister() - unregister a registered state
223  * @state:	state handle to be unregistered
225 void qcom_smem_state_unregister(struct qcom_smem_state *state)
227 	state->orphan = true;
228 	qcom_smem_state_put(state);