[net-next-2.6.git] / net / caif / cfutill.c

/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland/sjur.brandeland@stericsson.com
 * 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
#define UTIL_CTRL_PKT_SIZE 1
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 = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	if (!util) {
		pr_warn("Out of memory\n");
		return NULL;
	}
	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	memset(util, 0, sizeof(struct cfsrvl));
	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))
		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;
	ret = layr->dn->transmit(layr->dn, pkt);
	if (ret < 0) {
		u32 tmp32;
		cfpkt_extr_head(pkt, &tmp32, 4);
	}
	return ret;
}
Commit	Line	Data
b482cd20 SB	1	/*
	2	* Copyright (C) ST-Ericsson AB 2010
	3	* Author: Sjur Brendeland/sjur.brandeland@stericsson.com
	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
	23	#define UTIL_CTRL_PKT_SIZE 1
	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	{
	29	struct cfsrvl *util = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	30	if (!util) {
b31fa5ba	31	pr_warn("Out of memory\n");
b482cd20 SB	32	return NULL;
	33	}
	34	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	35	memset(util, 0, sizeof(struct cfsrvl));
b1c74247	36	cfsrvl_init(util, channel_id, dev_info, true);
b482cd20 SB	37	util->layer.receive = cfutill_receive;
	38	util->layer.transmit = cfutill_transmit;
	39	snprintf(util->layer.name, CAIF_LAYER_NAME_SZ - 1, "util1");
	40	return &util->layer;
	41	}
	42
	43	static int cfutill_receive(struct cflayer layr, struct cfpkt pkt)
	44	{
	45	u8 cmd = -1;
	46	struct cfsrvl *service = container_obj(layr);
	47	caif_assert(layr != NULL);
	48	caif_assert(layr->up != NULL);
	49	caif_assert(layr->up->receive != NULL);
	50	caif_assert(layr->up->ctrlcmd != NULL);
	51	if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
b31fa5ba	52	pr_err("Packet is erroneous!\n");
b482cd20 SB	53	cfpkt_destroy(pkt);
	54	return -EPROTO;
	55	}
	56
	57	switch (cmd) {
	58	case UTIL_PAYLOAD:
	59	return layr->up->receive(layr->up, pkt);
	60	case UTIL_FLOW_OFF:
	61	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
	62	cfpkt_destroy(pkt);
	63	return 0;
	64	case UTIL_FLOW_ON:
	65	layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
	66	cfpkt_destroy(pkt);
	67	return 0;
	68	case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
b31fa5ba	69	pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
b482cd20 SB	70	layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
	71	service->open = false;
	72	cfpkt_destroy(pkt);
	73	return 0;
	74	default:
	75	cfpkt_destroy(pkt);
b31fa5ba	76	pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
b482cd20 SB	77	return -EPROTO;
	78	}
	79	}
	80
	81	static int cfutill_transmit(struct cflayer layr, struct cfpkt pkt)
	82	{
	83	u8 zero = 0;
	84	struct caif_payload_info *info;
	85	int ret;
	86	struct cfsrvl *service = container_obj(layr);
	87	caif_assert(layr != NULL);
	88	caif_assert(layr->dn != NULL);
	89	caif_assert(layr->dn->transmit != NULL);
	90	if (!cfsrvl_ready(service, &ret))
	91	return ret;
	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;
	103	ret = layr->dn->transmit(layr->dn, pkt);
	104	if (ret < 0) {
	105	u32 tmp32;
	106	cfpkt_extr_head(pkt, &tmp32, 4);
	107	}
	108	return ret;
	109	}