cfsrvl.c 5.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (C) ST-Ericsson AB 2010
  4. * Author: Sjur Brendeland
  5. */
  6. #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
  7. #include <linux/kernel.h>
  8. #include <linux/types.h>
  9. #include <linux/errno.h>
  10. #include <linux/slab.h>
  11. #include <linux/module.h>
  12. #include <linux/pkt_sched.h>
  13. #include <net/caif/caif_layer.h>
  14. #include <net/caif/cfsrvl.h>
  15. #include <net/caif/cfpkt.h>
  16. #include <net/caif/caif_dev.h>
  17. #define SRVL_CTRL_PKT_SIZE 1
  18. #define SRVL_FLOW_OFF 0x81
  19. #define SRVL_FLOW_ON 0x80
  20. #define SRVL_SET_PIN 0x82
  21. #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  22. static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  23. int phyid)
  24. {
  25. struct cfsrvl *service = container_obj(layr);
  26. if (layr->up == NULL || layr->up->ctrlcmd == NULL)
  27. return;
  28. switch (ctrl) {
  29. case CAIF_CTRLCMD_INIT_RSP:
  30. service->open = true;
  31. layr->up->ctrlcmd(layr->up, ctrl, phyid);
  32. break;
  33. case CAIF_CTRLCMD_DEINIT_RSP:
  34. case CAIF_CTRLCMD_INIT_FAIL_RSP:
  35. service->open = false;
  36. layr->up->ctrlcmd(layr->up, ctrl, phyid);
  37. break;
  38. case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  39. if (phyid != service->dev_info.id)
  40. break;
  41. if (service->modem_flow_on)
  42. layr->up->ctrlcmd(layr->up,
  43. CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  44. service->phy_flow_on = false;
  45. break;
  46. case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  47. if (phyid != service->dev_info.id)
  48. return;
  49. if (service->modem_flow_on) {
  50. layr->up->ctrlcmd(layr->up,
  51. CAIF_CTRLCMD_FLOW_ON_IND,
  52. phyid);
  53. }
  54. service->phy_flow_on = true;
  55. break;
  56. case CAIF_CTRLCMD_FLOW_OFF_IND:
  57. if (service->phy_flow_on) {
  58. layr->up->ctrlcmd(layr->up,
  59. CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  60. }
  61. service->modem_flow_on = false;
  62. break;
  63. case CAIF_CTRLCMD_FLOW_ON_IND:
  64. if (service->phy_flow_on) {
  65. layr->up->ctrlcmd(layr->up,
  66. CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  67. }
  68. service->modem_flow_on = true;
  69. break;
  70. case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  71. /* In case interface is down, let's fake a remove shutdown */
  72. layr->up->ctrlcmd(layr->up,
  73. CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  74. break;
  75. case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  76. layr->up->ctrlcmd(layr->up, ctrl, phyid);
  77. break;
  78. default:
  79. pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
  80. /* We have both modem and phy flow on, send flow on */
  81. layr->up->ctrlcmd(layr->up, ctrl, phyid);
  82. service->phy_flow_on = true;
  83. break;
  84. }
  85. }
  86. static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  87. {
  88. struct cfsrvl *service = container_obj(layr);
  89. caif_assert(layr != NULL);
  90. caif_assert(layr->dn != NULL);
  91. caif_assert(layr->dn->transmit != NULL);
  92. if (!service->supports_flowctrl)
  93. return 0;
  94. switch (ctrl) {
  95. case CAIF_MODEMCMD_FLOW_ON_REQ:
  96. {
  97. struct cfpkt *pkt;
  98. struct caif_payload_info *info;
  99. u8 flow_on = SRVL_FLOW_ON;
  100. pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
  101. if (!pkt)
  102. return -ENOMEM;
  103. if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
  104. pr_err("Packet is erroneous!\n");
  105. cfpkt_destroy(pkt);
  106. return -EPROTO;
  107. }
  108. info = cfpkt_info(pkt);
  109. info->channel_id = service->layer.id;
  110. info->hdr_len = 1;
  111. info->dev_info = &service->dev_info;
  112. cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
  113. return layr->dn->transmit(layr->dn, pkt);
  114. }
  115. case CAIF_MODEMCMD_FLOW_OFF_REQ:
  116. {
  117. struct cfpkt *pkt;
  118. struct caif_payload_info *info;
  119. u8 flow_off = SRVL_FLOW_OFF;
  120. pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
  121. if (!pkt)
  122. return -ENOMEM;
  123. if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
  124. pr_err("Packet is erroneous!\n");
  125. cfpkt_destroy(pkt);
  126. return -EPROTO;
  127. }
  128. info = cfpkt_info(pkt);
  129. info->channel_id = service->layer.id;
  130. info->hdr_len = 1;
  131. info->dev_info = &service->dev_info;
  132. cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
  133. return layr->dn->transmit(layr->dn, pkt);
  134. }
  135. default:
  136. break;
  137. }
  138. return -EINVAL;
  139. }
  140. static void cfsrvl_release(struct cflayer *layer)
  141. {
  142. struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
  143. kfree(service);
  144. }
  145. void cfsrvl_init(struct cfsrvl *service,
  146. u8 channel_id,
  147. struct dev_info *dev_info,
  148. bool supports_flowctrl)
  149. {
  150. caif_assert(offsetof(struct cfsrvl, layer) == 0);
  151. service->open = false;
  152. service->modem_flow_on = true;
  153. service->phy_flow_on = true;
  154. service->layer.id = channel_id;
  155. service->layer.ctrlcmd = cfservl_ctrlcmd;
  156. service->layer.modemcmd = cfservl_modemcmd;
  157. service->dev_info = *dev_info;
  158. service->supports_flowctrl = supports_flowctrl;
  159. service->release = cfsrvl_release;
  160. }
  161. bool cfsrvl_ready(struct cfsrvl *service, int *err)
  162. {
  163. if (!service->open) {
  164. *err = -ENOTCONN;
  165. return false;
  166. }
  167. return true;
  168. }
  169. u8 cfsrvl_getphyid(struct cflayer *layer)
  170. {
  171. struct cfsrvl *servl = container_obj(layer);
  172. return servl->dev_info.id;
  173. }
  174. bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
  175. {
  176. struct cfsrvl *servl = container_obj(layer);
  177. return servl->dev_info.id == phyid;
  178. }
  179. void caif_free_client(struct cflayer *adap_layer)
  180. {
  181. struct cfsrvl *servl;
  182. if (adap_layer == NULL || adap_layer->dn == NULL)
  183. return;
  184. servl = container_obj(adap_layer->dn);
  185. servl->release(&servl->layer);
  186. }
  187. EXPORT_SYMBOL(caif_free_client);
  188. void caif_client_register_refcnt(struct cflayer *adapt_layer,
  189. void (*hold)(struct cflayer *lyr),
  190. void (*put)(struct cflayer *lyr))
  191. {
  192. struct cfsrvl *service;
  193. if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
  194. return;
  195. service = container_of(adapt_layer->dn, struct cfsrvl, layer);
  196. service->hold = hold;
  197. service->put = put;
  198. }
  199. EXPORT_SYMBOL(caif_client_register_refcnt);