[linux.git] / net / caif / cfutill.c

/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>

#define container_obj(layr) ((struct cfsrvl *) layr)
#define UTIL_PAYLOAD  0x00
#define UTIL_CMD_BIT  0x80
#define UTIL_REMOTE_SHUTDOWN 0x82
#define UTIL_FLOW_OFF 0x81
#define UTIL_FLOW_ON  0x80

static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);

struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
{
	struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	if (!util)
		return NULL;
	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	cfsrvl_init(util, channel_id, dev_info, true);
	util->layer.receive = cfutill_receive;
	util->layer.transmit = cfutill_transmit;
	snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
	return &util->layer;
}

static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
{
	u8 cmd = -1;
	struct cfsrvl *service = container_obj(layr);
	caif_assert(layr != NULL);
	caif_assert(layr->up != NULL);
	caif_assert(layr->up->receive != NULL);
	caif_assert(layr->up->ctrlcmd != NULL);
	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
		pr_err("Packet is erroneous!\n");
		cfpkt_destroy(pkt);
		return -EPROTO;
	}

	switch (cmd) {
	case UTIL_PAYLOAD:
		return layr->up->receive(layr->up, pkt);
	case UTIL_FLOW_OFF:
		layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
		cfpkt_destroy(pkt);
		return 0;
	case UTIL_FLOW_ON:
		layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
		cfpkt_destroy(pkt);
		return 0;
	case UTIL_REMOTE_SHUTDOWN:	/* Remote Shutdown Request */
		pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
		layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
		service->open = false;
		cfpkt_destroy(pkt);
		return 0;
	default:
		cfpkt_destroy(pkt);
		pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
		return -EPROTO;
	}
}

static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
	u8 zero = 0;
	struct caif_payload_info *info;
	int ret;
	struct cfsrvl *service = container_obj(layr);
	caif_assert(layr != NULL);
	caif_assert(layr->dn != NULL);
	caif_assert(layr->dn->transmit != NULL);

	if (!cfsrvl_ready(service, &ret)) {
		cfpkt_destroy(pkt);
		return ret;
	}

	cfpkt_add_head(pkt, &zero, 1);
	/* Add info for MUX-layer to route the packet out. */
	info = cfpkt_info(pkt);
	info->channel_id = service->layer.id;
	/*
	 * To optimize alignment, we add up the size of CAIF header before
	 * payload.
	 */
	info->hdr_len = 1;
	info->dev_info = &service->dev_info;
	return layr->dn->transmit(layr->dn, pkt);
}
Commit	Line	Data
b482cd20 SB	1	/*
b482cd20 SB	2	* Copyright (C) ST-Ericsson AB 2010
26ee65e6	3	* Author: Sjur Brendeland
b482cd20 SB	4	* License terms: GNU General Public License (GPL) version 2
	5	*/
	6
b31fa5ba JP	7	#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
b31fa5ba JP	8
b482cd20 SB	9	#include <linux/kernel.h>
	10	#include <linux/types.h>
	11	#include <linux/slab.h>
	12	#include <linux/errno.h>
	13	#include <net/caif/caif_layer.h>
	14	#include <net/caif/cfsrvl.h>
	15	#include <net/caif/cfpkt.h>
	16
	17	#define container_obj(layr) ((struct cfsrvl *) layr)
	18	#define UTIL_PAYLOAD 0x00
	19	#define UTIL_CMD_BIT 0x80
	20	#define UTIL_REMOTE_SHUTDOWN 0x82
	21	#define UTIL_FLOW_OFF 0x81
	22	#define UTIL_FLOW_ON 0x80
441c793a	23
b482cd20 SB	24	static int cfutill_receive(struct cflayer layr, struct cfpkt pkt);
	25	static int cfutill_transmit(struct cflayer layr, struct cfpkt pkt);
	26
	27	struct cflayer cfutill_create(u8 channel_id, struct dev_info dev_info)
	28	{
7ac2ed0c JP	29	struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
7ac2ed0c JP	30	if (!util)
b482cd20	31	return NULL;
b482cd20	32	caif_assert(offsetof(struct cfsrvl, layer) == 0);
b1c74247	33	cfsrvl_init(util, channel_id, dev_info, true);
b482cd20 SB	34	util->layer.receive = cfutill_receive;
	35	util->layer.transmit = cfutill_transmit;
	36	snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
	37	return &util->layer;
	38	}
	39
	40	static int cfutill_receive(struct cflayer layr, struct cfpkt pkt)
	41	{
	42	u8 cmd = -1;
	43	struct cfsrvl *service = container_obj(layr);
	44	caif_assert(layr != NULL);
	45	caif_assert(layr->up != NULL);
	46	caif_assert(layr->up->receive != NULL);
	47	caif_assert(layr->up->ctrlcmd != NULL);
	48	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
b31fa5ba	49	pr_err("Packet is erroneous!\n");
b482cd20 SB	50	cfpkt_destroy(pkt);
	51	return -EPROTO;
	52	}
	53
	54	switch (cmd) {
	55	case UTIL_PAYLOAD:
	56	return layr->up->receive(layr->up, pkt);
	57	case UTIL_FLOW_OFF:
	58	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
	59	cfpkt_destroy(pkt);
	60	return 0;
	61	case UTIL_FLOW_ON:
	62	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
	63	cfpkt_destroy(pkt);
	64	return 0;
	65	case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
b31fa5ba	66	pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
b482cd20 SB	67	layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
	68	service->open = false;
	69	cfpkt_destroy(pkt);
	70	return 0;
	71	default:
	72	cfpkt_destroy(pkt);
b31fa5ba	73	pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
b482cd20 SB	74	return -EPROTO;
	75	}
	76	}
	77
	78	static int cfutill_transmit(struct cflayer layr, struct cfpkt pkt)
	79	{
	80	u8 zero = 0;
	81	struct caif_payload_info *info;
	82	int ret;
	83	struct cfsrvl *service = container_obj(layr);
	84	caif_assert(layr != NULL);
	85	caif_assert(layr->dn != NULL);
	86	caif_assert(layr->dn->transmit != NULL);
374458b3 DT	87
	88	if (!cfsrvl_ready(service, &ret)) {
	89	cfpkt_destroy(pkt);
b482cd20	90	return ret;
374458b3	91	}
b482cd20	92
b482cd20 SB	93	cfpkt_add_head(pkt, &zero, 1);
	94	/* Add info for MUX-layer to route the packet out. */
	95	info = cfpkt_info(pkt);
	96	info->channel_id = service->layer.id;
	97	/*
	98	* To optimize alignment, we add up the size of CAIF header before
	99	* payload.
	100	*/
	101	info->hdr_len = 1;
	102	info->dev_info = &service->dev_info;
4dd820c0	103	return layr->dn->transmit(layr->dn, pkt);
b482cd20	104	}