release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/ti-st/st_ll.c

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