1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Shared Transport driver
4 * HCI-LL module responsible for TI proprietary HCI_LL protocol
5 * Copyright (C) 2009-2010 Texas Instruments
6 * Author: Pavan Savoy <pavan_savoy@ti.com>
7 */
8
9 #define pr_fmt(fmt) "(stll) :" fmt
10 #include <linux/skbuff.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/ti_wilink_st.h>
14
15 /**********************************************************************/
16 /* internal functions */
send_ll_cmd(struct st_data_s * st_data,unsigned char cmd)17 static void send_ll_cmd(struct st_data_s *st_data,
18 unsigned char cmd)
19 {
20
21 pr_debug("%s: writing %x", __func__, cmd);
22 st_int_write(st_data, &cmd, 1);
23 return;
24 }
25
ll_device_want_to_sleep(struct st_data_s * st_data)26 static void ll_device_want_to_sleep(struct st_data_s *st_data)
27 {
28 struct kim_data_s *kim_data;
29 struct ti_st_plat_data *pdata;
30
31 pr_debug("%s", __func__);
32 /* sanity check */
33 if (st_data->ll_state != ST_LL_AWAKE)
34 pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
35 "in state %ld", st_data->ll_state);
36
37 send_ll_cmd(st_data, LL_SLEEP_ACK);
38 /* update state */
39 st_data->ll_state = ST_LL_ASLEEP;
40
41 /* communicate to platform about chip asleep */
42 kim_data = st_data->kim_data;
43 pdata = kim_data->kim_pdev->dev.platform_data;
44 if (pdata->chip_asleep)
45 pdata->chip_asleep(NULL);
46 }
47
ll_device_want_to_wakeup(struct st_data_s * st_data)48 static void ll_device_want_to_wakeup(struct st_data_s *st_data)
49 {
50 struct kim_data_s *kim_data;
51 struct ti_st_plat_data *pdata;
52
53 /* diff actions in diff states */
54 switch (st_data->ll_state) {
55 case ST_LL_ASLEEP:
56 send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */
57 break;
58 case ST_LL_ASLEEP_TO_AWAKE:
59 /* duplicate wake_ind */
60 pr_err("duplicate wake_ind while waiting for Wake ack");
61 break;
62 case ST_LL_AWAKE:
63 /* duplicate wake_ind */
64 pr_err("duplicate wake_ind already AWAKE");
65 break;
66 case ST_LL_AWAKE_TO_ASLEEP:
67 /* duplicate wake_ind */
68 pr_err("duplicate wake_ind");
69 break;
70 }
71 /* update state */
72 st_data->ll_state = ST_LL_AWAKE;
73
74 /* communicate to platform about chip wakeup */
75 kim_data = st_data->kim_data;
76 pdata = kim_data->kim_pdev->dev.platform_data;
77 if (pdata->chip_awake)
78 pdata->chip_awake(NULL);
79 }
80
81 /**********************************************************************/
82 /* functions invoked by ST Core */
83
84 /* called when ST Core wants to
85 * enable ST LL */
st_ll_enable(struct st_data_s * ll)86 void st_ll_enable(struct st_data_s *ll)
87 {
88 ll->ll_state = ST_LL_AWAKE;
89 }
90
91 /* called when ST Core /local module wants to
92 * disable ST LL */
st_ll_disable(struct st_data_s * ll)93 void st_ll_disable(struct st_data_s *ll)
94 {
95 ll->ll_state = ST_LL_INVALID;
96 }
97
98 /* called when ST Core wants to update the state */
st_ll_wakeup(struct st_data_s * ll)99 void st_ll_wakeup(struct st_data_s *ll)
100 {
101 if (likely(ll->ll_state != ST_LL_AWAKE)) {
102 send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */
103 ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
104 } else {
105 /* don't send the duplicate wake_indication */
106 pr_err(" Chip already AWAKE ");
107 }
108 }
109
110 /* called when ST Core wants the state */
st_ll_getstate(struct st_data_s * ll)111 unsigned long st_ll_getstate(struct st_data_s *ll)
112 {
113 pr_debug(" returning state %ld", ll->ll_state);
114 return ll->ll_state;
115 }
116
117 /* called from ST Core, when a PM related packet arrives */
st_ll_sleep_state(struct st_data_s * st_data,unsigned char cmd)118 unsigned long st_ll_sleep_state(struct st_data_s *st_data,
119 unsigned char cmd)
120 {
121 switch (cmd) {
122 case LL_SLEEP_IND: /* sleep ind */
123 pr_debug("sleep indication recvd");
124 ll_device_want_to_sleep(st_data);
125 break;
126 case LL_SLEEP_ACK: /* sleep ack */
127 pr_err("sleep ack rcvd: host shouldn't");
128 break;
129 case LL_WAKE_UP_IND: /* wake ind */
130 pr_debug("wake indication recvd");
131 ll_device_want_to_wakeup(st_data);
132 break;
133 case LL_WAKE_UP_ACK: /* wake ack */
134 pr_debug("wake ack rcvd");
135 st_data->ll_state = ST_LL_AWAKE;
136 break;
137 default:
138 pr_err(" unknown input/state ");
139 return -EINVAL;
140 }
141 return 0;
142 }
143
144 /* Called from ST CORE to initialize ST LL */
st_ll_init(struct st_data_s * ll)145 long st_ll_init(struct st_data_s *ll)
146 {
147 /* set state to invalid */
148 ll->ll_state = ST_LL_INVALID;
149 return 0;
150 }
151
152 /* Called from ST CORE to de-initialize ST LL */
st_ll_deinit(struct st_data_s * ll)153 long st_ll_deinit(struct st_data_s *ll)
154 {
155 return 0;
156 }
157