Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Shared Transport driver |
| 3 | * HCI-LL module responsible for TI proprietary HCI_LL protocol |
Pavan Savoy | a0cc2f3 | 2010-10-06 12:18:14 -0400 | [diff] [blame] | 4 | * Copyright (C) 2009-2010 Texas Instruments |
| 5 | * Author: Pavan Savoy <pavan_savoy@ti.com> |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 |
Pavan Savoy | 83ef41f | 2010-09-17 12:06:11 -0400 | [diff] [blame] | 23 | #include <linux/skbuff.h> |
| 24 | #include <linux/module.h> |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 25 | #include <linux/platform_device.h> |
Pavan Savoy | e555867 | 2010-09-30 16:13:30 -0400 | [diff] [blame] | 26 | #include <linux/ti_wilink_st.h> |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 27 | |
| 28 | /**********************************************************************/ |
| 29 | /* internal functions */ |
| 30 | static void send_ll_cmd(struct st_data_s *st_data, |
| 31 | unsigned char cmd) |
| 32 | { |
| 33 | |
Pavan Savoy | 6710fcf | 2011-02-04 02:23:12 -0600 | [diff] [blame] | 34 | pr_debug("%s: writing %x", __func__, cmd); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 | { |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 41 | struct kim_data_s *kim_data; |
| 42 | struct ti_st_plat_data *pdata; |
| 43 | |
Pavan Savoy | e6d9e64 | 2010-07-22 05:32:05 -0500 | [diff] [blame] | 44 | pr_debug("%s", __func__); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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; |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 53 | |
| 54 | /* communicate to platform about chip asleep */ |
| 55 | kim_data = st_data->kim_data; |
| 56 | pdata = kim_data->kim_pdev->dev.platform_data; |
| 57 | if (pdata->chip_asleep) |
| 58 | pdata->chip_asleep(NULL); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static void ll_device_want_to_wakeup(struct st_data_s *st_data) |
| 62 | { |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 63 | struct kim_data_s *kim_data; |
| 64 | struct ti_st_plat_data *pdata; |
| 65 | |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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; |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 86 | |
| 87 | /* communicate to platform about chip wakeup */ |
| 88 | kim_data = st_data->kim_data; |
| 89 | pdata = kim_data->kim_pdev->dev.platform_data; |
Matthias Kaehlcke | f3d9d36 | 2012-08-02 22:17:48 +0200 | [diff] [blame^] | 90 | if (pdata->chip_awake) |
Pavan Savoy | 0d7c5f2 | 2011-08-10 10:18:31 -0500 | [diff] [blame] | 91 | pdata->chip_awake(NULL); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 | { |
Pavan Savoy | e6d9e64 | 2010-07-22 05:32:05 -0500 | [diff] [blame] | 126 | pr_debug(" returning state %ld", ll->ll_state); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 */ |
Pavan Savoy | 6710fcf | 2011-02-04 02:23:12 -0600 | [diff] [blame] | 136 | pr_debug("sleep indication recvd"); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 */ |
Pavan Savoy | 6710fcf | 2011-02-04 02:23:12 -0600 | [diff] [blame] | 143 | pr_debug("wake indication recvd"); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 144 | ll_device_want_to_wakeup(st_data); |
| 145 | break; |
| 146 | case LL_WAKE_UP_ACK: /* wake ack */ |
Pavan Savoy | 6710fcf | 2011-02-04 02:23:12 -0600 | [diff] [blame] | 147 | pr_debug("wake ack rcvd"); |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 148 | st_data->ll_state = ST_LL_AWAKE; |
| 149 | break; |
| 150 | default: |
| 151 | pr_err(" unknown input/state "); |
Pavan Savoy | 7044266 | 2011-02-04 02:23:11 -0600 | [diff] [blame] | 152 | return -EINVAL; |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 153 | } |
Pavan Savoy | 320920c | 2010-07-14 08:21:12 -0500 | [diff] [blame] | 154 | return 0; |
Pavan Savoy | 1d065ab | 2010-04-08 13:16:55 -0500 | [diff] [blame] | 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 | } |