1/******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license.  When using or
4 * redistributing this file, you may do so under either license.
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8 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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65#ifndef __iwl_op_mode_h__
66#define __iwl_op_mode_h__
67
68#include <linux/netdevice.h>
69#include <linux/debugfs.h>
70
71struct iwl_op_mode;
72struct iwl_trans;
73struct sk_buff;
74struct iwl_device_cmd;
75struct iwl_rx_cmd_buffer;
76struct iwl_fw;
77struct iwl_cfg;
78
79/**
80 * DOC: Operational mode - what is it ?
81 *
82 * The operational mode (a.k.a. op_mode) is the layer that implements
83 * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
84 * the transport API to access the HW. The op_mode doesn't need to know how the
85 * underlying HW works, since the transport layer takes care of that.
86 *
87 * There can be several op_mode: i.e. different fw APIs will require two
88 * different op_modes. This is why the op_mode is virtualized.
89 */
90
91/**
92 * DOC: Life cycle of the Operational mode
93 *
94 * The operational mode has a very simple life cycle.
95 *
96 *	1) The driver layer (iwl-drv.c) chooses the op_mode based on the
97 *	   capabilities advertised by the fw file (in TLV format).
98 *	2) The driver layer starts the op_mode (ops->start)
99 *	3) The op_mode registers mac80211
100 *	4) The op_mode is governed by mac80211
101 *	5) The driver layer stops the op_mode
102 */
103
104/**
105 * struct iwl_op_mode_ops - op_mode specific operations
106 *
107 * The op_mode exports its ops so that external components can start it and
108 * interact with it. The driver layer typically calls the start and stop
109 * handlers, the transport layer calls the others.
110 *
111 * All the handlers MUST be implemented
112 *
113 * @start: start the op_mode. The transport layer is already allocated.
114 *	May sleep
115 * @stop: stop the op_mode. Must free all the memory allocated.
116 *	May sleep
117 * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
118 *	HCMD this Rx responds to. Can't sleep.
119 * @napi_add: NAPI initialization. The transport is fully responsible for NAPI,
120 *	but the higher layers need to know about it (in particular mac80211 to
121 *	to able to call the right NAPI RX functions); this function is needed
122 *	to eventually call netif_napi_add() with higher layer involvement.
123 * @queue_full: notifies that a HW queue is full.
124 *	Must be atomic and called with BH disabled.
125 * @queue_not_full: notifies that a HW queue is not full any more.
126 *	Must be atomic and called with BH disabled.
127 * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
128 *	the radio is killed. Return %true if the device should be stopped by
129 *	the transport immediately after the call. May sleep.
130 * @free_skb: allows the transport layer to free skbs that haven't been
131 *	reclaimed by the op_mode. This can happen when the driver is freed and
132 *	there are Tx packets pending in the transport layer.
133 *	Must be atomic
134 * @nic_error: error notification. Must be atomic and must be called with BH
135 *	disabled.
136 * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
137 *	called with BH disabled.
138 * @nic_config: configure NIC, called before firmware is started.
139 *	May sleep
140 * @wimax_active: invoked when WiMax becomes active. May sleep
141 * @enter_d0i3: configure the fw to enter d0i3. return 1 to indicate d0i3
142 *	entrance is aborted (e.g. due to held reference). May sleep.
143 * @exit_d0i3: configure the fw to exit d0i3. May sleep.
144 */
145struct iwl_op_mode_ops {
146	struct iwl_op_mode *(*start)(struct iwl_trans *trans,
147				     const struct iwl_cfg *cfg,
148				     const struct iwl_fw *fw,
149				     struct dentry *dbgfs_dir);
150	void (*stop)(struct iwl_op_mode *op_mode);
151	int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
152		  struct iwl_device_cmd *cmd);
153	void (*napi_add)(struct iwl_op_mode *op_mode,
154			 struct napi_struct *napi,
155			 struct net_device *napi_dev,
156			 int (*poll)(struct napi_struct *, int),
157			 int weight);
158	void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
159	void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
160	bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
161	void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
162	void (*nic_error)(struct iwl_op_mode *op_mode);
163	void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
164	void (*nic_config)(struct iwl_op_mode *op_mode);
165	void (*wimax_active)(struct iwl_op_mode *op_mode);
166	int (*enter_d0i3)(struct iwl_op_mode *op_mode);
167	int (*exit_d0i3)(struct iwl_op_mode *op_mode);
168};
169
170int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
171void iwl_opmode_deregister(const char *name);
172
173/**
174 * struct iwl_op_mode - operational mode
175 * @ops: pointer to its own ops
176 *
177 * This holds an implementation of the mac80211 / fw API.
178 */
179struct iwl_op_mode {
180	const struct iwl_op_mode_ops *ops;
181
182	char op_mode_specific[0] __aligned(sizeof(void *));
183};
184
185static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
186{
187	might_sleep();
188	op_mode->ops->stop(op_mode);
189}
190
191static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
192				  struct iwl_rx_cmd_buffer *rxb,
193				  struct iwl_device_cmd *cmd)
194{
195	return op_mode->ops->rx(op_mode, rxb, cmd);
196}
197
198static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
199					  int queue)
200{
201	op_mode->ops->queue_full(op_mode, queue);
202}
203
204static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
205					      int queue)
206{
207	op_mode->ops->queue_not_full(op_mode, queue);
208}
209
210static inline bool __must_check
211iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
212{
213	might_sleep();
214	return op_mode->ops->hw_rf_kill(op_mode, state);
215}
216
217static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
218					struct sk_buff *skb)
219{
220	op_mode->ops->free_skb(op_mode, skb);
221}
222
223static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
224{
225	op_mode->ops->nic_error(op_mode);
226}
227
228static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
229{
230	op_mode->ops->cmd_queue_full(op_mode);
231}
232
233static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
234{
235	might_sleep();
236	op_mode->ops->nic_config(op_mode);
237}
238
239static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
240{
241	might_sleep();
242	op_mode->ops->wimax_active(op_mode);
243}
244
245static inline int iwl_op_mode_enter_d0i3(struct iwl_op_mode *op_mode)
246{
247	might_sleep();
248
249	if (!op_mode->ops->enter_d0i3)
250		return 0;
251	return op_mode->ops->enter_d0i3(op_mode);
252}
253
254static inline int iwl_op_mode_exit_d0i3(struct iwl_op_mode *op_mode)
255{
256	might_sleep();
257
258	if (!op_mode->ops->exit_d0i3)
259		return 0;
260	return op_mode->ops->exit_d0i3(op_mode);
261}
262
263static inline void iwl_op_mode_napi_add(struct iwl_op_mode *op_mode,
264					struct napi_struct *napi,
265					struct net_device *napi_dev,
266					int (*poll)(struct napi_struct *, int),
267					int weight)
268{
269	if (!op_mode->ops->napi_add)
270		return;
271	op_mode->ops->napi_add(op_mode, napi, napi_dev, poll, weight);
272}
273
274#endif /* __iwl_op_mode_h__ */
275