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1d065ab6 PS |
1 | /* |
2 | * Shared Transport driver | |
3 | * HCI-LL module responsible for TI proprietary HCI_LL protocol | |
a0cc2f3b PS |
4 | * Copyright (C) 2009-2010 Texas Instruments |
5 | * Author: Pavan Savoy <pavan_savoy@ti.com> | |
1d065ab6 PS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #define pr_fmt(fmt) "(stll) :" fmt | |
83ef41f0 PS |
23 | #include <linux/skbuff.h> |
24 | #include <linux/module.h> | |
0d7c5f25 | 25 | #include <linux/platform_device.h> |
e5558679 | 26 | #include <linux/ti_wilink_st.h> |
1d065ab6 PS |
27 | |
28 | /**********************************************************************/ | |
29 | /* internal functions */ | |
30 | static void send_ll_cmd(struct st_data_s *st_data, | |
31 | unsigned char cmd) | |
32 | { | |
33 | ||
6710fcff | 34 | pr_debug("%s: writing %x", __func__, cmd); |
1d065ab6 PS |
35 | st_int_write(st_data, &cmd, 1); |
36 | return; | |
37 | } | |
38 | ||
39 | static void ll_device_want_to_sleep(struct st_data_s *st_data) | |
40 | { | |
0d7c5f25 PS |
41 | struct kim_data_s *kim_data; |
42 | struct ti_st_plat_data *pdata; | |
43 | ||
e6d9e64e | 44 | pr_debug("%s", __func__); |
1d065ab6 PS |
45 | /* sanity check */ |
46 | if (st_data->ll_state != ST_LL_AWAKE) | |
47 | pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND" | |
48 | "in state %ld", st_data->ll_state); | |
49 | ||
50 | send_ll_cmd(st_data, LL_SLEEP_ACK); | |
51 | /* update state */ | |
52 | st_data->ll_state = ST_LL_ASLEEP; | |
0d7c5f25 PS |
53 | |
54 | /* communicate to platform about chip asleep */ | |
55 | kim_data = st_data->kim_data; | |
c0bd1b9e | 56 | pdata = kim_data->kim_pdev->dev.platform_data; |
0d7c5f25 PS |
57 | if (pdata->chip_asleep) |
58 | pdata->chip_asleep(NULL); | |
1d065ab6 PS |
59 | } |
60 | ||
61 | static void ll_device_want_to_wakeup(struct st_data_s *st_data) | |
62 | { | |
0d7c5f25 PS |
63 | struct kim_data_s *kim_data; |
64 | struct ti_st_plat_data *pdata; | |
65 | ||
1d065ab6 PS |
66 | /* diff actions in diff states */ |
67 | switch (st_data->ll_state) { | |
68 | case ST_LL_ASLEEP: | |
69 | send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */ | |
70 | break; | |
71 | case ST_LL_ASLEEP_TO_AWAKE: | |
72 | /* duplicate wake_ind */ | |
73 | pr_err("duplicate wake_ind while waiting for Wake ack"); | |
74 | break; | |
75 | case ST_LL_AWAKE: | |
76 | /* duplicate wake_ind */ | |
77 | pr_err("duplicate wake_ind already AWAKE"); | |
78 | break; | |
79 | case ST_LL_AWAKE_TO_ASLEEP: | |
80 | /* duplicate wake_ind */ | |
81 | pr_err("duplicate wake_ind"); | |
82 | break; | |
83 | } | |
84 | /* update state */ | |
85 | st_data->ll_state = ST_LL_AWAKE; | |
0d7c5f25 PS |
86 | |
87 | /* communicate to platform about chip wakeup */ | |
88 | kim_data = st_data->kim_data; | |
c0bd1b9e | 89 | pdata = kim_data->kim_pdev->dev.platform_data; |
f3d9d365 | 90 | if (pdata->chip_awake) |
0d7c5f25 | 91 | pdata->chip_awake(NULL); |
1d065ab6 PS |
92 | } |
93 | ||
94 | /**********************************************************************/ | |
95 | /* functions invoked by ST Core */ | |
96 | ||
97 | /* called when ST Core wants to | |
98 | * enable ST LL */ | |
99 | void st_ll_enable(struct st_data_s *ll) | |
100 | { | |
101 | ll->ll_state = ST_LL_AWAKE; | |
102 | } | |
103 | ||
104 | /* called when ST Core /local module wants to | |
105 | * disable ST LL */ | |
106 | void st_ll_disable(struct st_data_s *ll) | |
107 | { | |
108 | ll->ll_state = ST_LL_INVALID; | |
109 | } | |
110 | ||
111 | /* called when ST Core wants to update the state */ | |
112 | void st_ll_wakeup(struct st_data_s *ll) | |
113 | { | |
114 | if (likely(ll->ll_state != ST_LL_AWAKE)) { | |
115 | send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */ | |
116 | ll->ll_state = ST_LL_ASLEEP_TO_AWAKE; | |
117 | } else { | |
118 | /* don't send the duplicate wake_indication */ | |
119 | pr_err(" Chip already AWAKE "); | |
120 | } | |
121 | } | |
122 | ||
123 | /* called when ST Core wants the state */ | |
124 | unsigned long st_ll_getstate(struct st_data_s *ll) | |
125 | { | |
e6d9e64e | 126 | pr_debug(" returning state %ld", ll->ll_state); |
1d065ab6 PS |
127 | return ll->ll_state; |
128 | } | |
129 | ||
130 | /* called from ST Core, when a PM related packet arrives */ | |
131 | unsigned long st_ll_sleep_state(struct st_data_s *st_data, | |
132 | unsigned char cmd) | |
133 | { | |
134 | switch (cmd) { | |
135 | case LL_SLEEP_IND: /* sleep ind */ | |
6710fcff | 136 | pr_debug("sleep indication recvd"); |
1d065ab6 PS |
137 | ll_device_want_to_sleep(st_data); |
138 | break; | |
139 | case LL_SLEEP_ACK: /* sleep ack */ | |
140 | pr_err("sleep ack rcvd: host shouldn't"); | |
141 | break; | |
142 | case LL_WAKE_UP_IND: /* wake ind */ | |
6710fcff | 143 | pr_debug("wake indication recvd"); |
1d065ab6 PS |
144 | ll_device_want_to_wakeup(st_data); |
145 | break; | |
146 | case LL_WAKE_UP_ACK: /* wake ack */ | |
6710fcff | 147 | pr_debug("wake ack rcvd"); |
1d065ab6 PS |
148 | st_data->ll_state = ST_LL_AWAKE; |
149 | break; | |
150 | default: | |
151 | pr_err(" unknown input/state "); | |
70442664 | 152 | return -EINVAL; |
1d065ab6 | 153 | } |
320920cb | 154 | return 0; |
1d065ab6 PS |
155 | } |
156 | ||
157 | /* Called from ST CORE to initialize ST LL */ | |
158 | long st_ll_init(struct st_data_s *ll) | |
159 | { | |
160 | /* set state to invalid */ | |
161 | ll->ll_state = ST_LL_INVALID; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | /* Called from ST CORE to de-initialize ST LL */ | |
166 | long st_ll_deinit(struct st_data_s *ll) | |
167 | { | |
168 | return 0; | |
169 | } |