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 */
17static 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
26static 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
48static 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 */
86void 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 */
93void 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 */
99void 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 */
111unsigned 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 */
118unsigned 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 */
145long 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 */
153long st_ll_deinit(struct st_data_s *ll)
154{
155	return 0;
156}
157