2 * Shared Transport driver
3 * HCI-LL module responsible for TI proprietary HCI_LL protocol
4 * Copyright (C) 2009-2010 Texas Instruments
5 * Author: Pavan Savoy <pavan_savoy@ti.com>
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.
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.
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
22 #define pr_fmt(fmt) "(stll) :" fmt
23 #include <linux/skbuff.h>
24 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/ti_wilink_st.h>
28 /**********************************************************************/
30 /* internal functions */
31 static void send_ll_cmd(struct st_data_s *st_data,
35 pr_debug("%s: writing %x", __func__, cmd);
36 st_int_write(st_data, &cmd, 1);
40 static void ll_device_want_to_sleep(struct st_data_s *st_data)
42 struct kim_data_s *kim_data;
43 struct ti_st_plat_data *pdata;
45 pr_debug("%s", __func__);
47 if (st_data->ll_state != ST_LL_AWAKE)
48 pr_err("ERR hcill: ST_LL_GO_TO_SLEEP_IND"
49 "in state %ld", st_data->ll_state);
51 send_ll_cmd(st_data, LL_SLEEP_ACK);
53 st_data->ll_state = ST_LL_ASLEEP;
55 /* communicate to platform about chip asleep */
56 kim_data = st_data->kim_data;
57 if (kim_data->kim_pdev->dev.of_node) {
58 pr_debug("use device tree data");
61 pdata = kim_data->kim_pdev->dev.platform_data;
64 if (pdata->chip_asleep)
65 pdata->chip_asleep(NULL);
68 static void ll_device_want_to_wakeup(struct st_data_s *st_data)
70 struct kim_data_s *kim_data;
71 struct ti_st_plat_data *pdata;
73 /* diff actions in diff states */
74 switch (st_data->ll_state) {
76 send_ll_cmd(st_data, LL_WAKE_UP_ACK); /* send wake_ack */
78 case ST_LL_ASLEEP_TO_AWAKE:
79 /* duplicate wake_ind */
80 pr_err("duplicate wake_ind while waiting for Wake ack");
83 /* duplicate wake_ind */
84 pr_err("duplicate wake_ind already AWAKE");
86 case ST_LL_AWAKE_TO_ASLEEP:
87 /* duplicate wake_ind */
88 pr_err("duplicate wake_ind");
92 st_data->ll_state = ST_LL_AWAKE;
94 /* communicate to platform about chip wakeup */
95 kim_data = st_data->kim_data;
96 if (kim_data->kim_pdev->dev.of_node) {
97 pr_debug("use device tree data");
100 pdata = kim_data->kim_pdev->dev.platform_data;
103 if (pdata->chip_awake)
104 pdata->chip_awake(NULL);
107 /**********************************************************************/
108 /* functions invoked by ST Core */
110 /* called when ST Core wants to
112 void st_ll_enable(struct st_data_s *ll)
114 ll->ll_state = ST_LL_AWAKE;
117 /* called when ST Core /local module wants to
119 void st_ll_disable(struct st_data_s *ll)
121 ll->ll_state = ST_LL_INVALID;
124 /* called when ST Core wants to update the state */
125 void st_ll_wakeup(struct st_data_s *ll)
127 if (likely(ll->ll_state != ST_LL_AWAKE)) {
128 send_ll_cmd(ll, LL_WAKE_UP_IND); /* WAKE_IND */
129 ll->ll_state = ST_LL_ASLEEP_TO_AWAKE;
131 /* don't send the duplicate wake_indication */
132 pr_err(" Chip already AWAKE ");
136 /* called when ST Core wants the state */
137 unsigned long st_ll_getstate(struct st_data_s *ll)
139 pr_debug(" returning state %ld", ll->ll_state);
143 /* called from ST Core, when a PM related packet arrives */
144 unsigned long st_ll_sleep_state(struct st_data_s *st_data,
148 case LL_SLEEP_IND: /* sleep ind */
149 pr_debug("sleep indication recvd");
150 ll_device_want_to_sleep(st_data);
152 case LL_SLEEP_ACK: /* sleep ack */
153 pr_err("sleep ack rcvd: host shouldn't");
155 case LL_WAKE_UP_IND: /* wake ind */
156 pr_debug("wake indication recvd");
157 ll_device_want_to_wakeup(st_data);
159 case LL_WAKE_UP_ACK: /* wake ack */
160 pr_debug("wake ack rcvd");
161 st_data->ll_state = ST_LL_AWAKE;
164 pr_err(" unknown input/state ");
170 /* Called from ST CORE to initialize ST LL */
171 long st_ll_init(struct st_data_s *ll)
173 /* set state to invalid */
174 ll->ll_state = ST_LL_INVALID;
178 /* Called from ST CORE to de-initialize ST LL */
179 long st_ll_deinit(struct st_data_s *ll)