pvrusb2-i2c-core.c

V4l driver for DVB HD

	}
	mutex_lock(&hdw->i2c_list_lock); do {
		pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: core_sync BEGIN");
		if (hdw->i2c_pend_types & PVR2_I2C_PEND_DETECT) {
			/* One or more I2C clients have attached since we
			   last synced.  So scan the list and identify the
			   new clients. */
			char *buf;
			unsigned int cnt;
			unsigned long amask = 0;
			buf = kmalloc(BUFSIZE,GFP_KERNEL);
			pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_DETECT");
			hdw->i2c_pend_types &= ~PVR2_I2C_PEND_DETECT;
			list_for_each(item,&hdw->i2c_clients) {
				cp = list_entry(item,struct pvr2_i2c_client,
						list);
				if (!cp->detected_flag) {
					cp->ctl_mask = 0;
					pvr2_i2c_probe(hdw,cp);
					cp->detected_flag = !0;
					msk = cp->ctl_mask;
					cnt = 0;
					if (buf) {
						cnt = pvr2_i2c_client_describe(
							cp,
							PVR2_I2C_DETAIL_ALL,
							buf,BUFSIZE);
					}
					trace_i2c("Probed: %.*s",cnt,buf);
					if (handler_check(cp)) {
						hdw->i2c_pend_types |=
							PVR2_I2C_PEND_CLIENT;
					}
					cp->pend_mask = msk;
					hdw->i2c_pend_mask |= msk;
					hdw->i2c_pend_types |=
						PVR2_I2C_PEND_REFRESH;
				}
				amask |= cp->ctl_mask;
			}
			hdw->i2c_active_mask = amask;
			if (buf) kfree(buf);
		}
		if (hdw->i2c_pend_types & PVR2_I2C_PEND_STALE) {
			/* Need to do one or more global updates.  Arrange
			   for this to happen. */
			unsigned long m2;
			pvr2_trace(PVR2_TRACE_I2C_CORE,
				   "i2c: PEND_STALE (0x%lx)",
				   hdw->i2c_stale_mask);
			hdw->i2c_pend_types &= ~PVR2_I2C_PEND_STALE;
			list_for_each(item,&hdw->i2c_clients) {
				cp = list_entry(item,struct pvr2_i2c_client,
						list);
				m2 = hdw->i2c_stale_mask;
				m2 &= cp->ctl_mask;
				m2 &= ~cp->pend_mask;
				if (m2) {
					pvr2_trace(PVR2_TRACE_I2C_CORE,
						   "i2c: cp=%p setting 0x%lx",
						   cp,m2);
					cp->pend_mask |= m2;
				}
			}
			hdw->i2c_pend_mask |= hdw->i2c_stale_mask;
			hdw->i2c_stale_mask = 0;
			hdw->i2c_pend_types |= PVR2_I2C_PEND_REFRESH;
		}
		if (hdw->i2c_pend_types & PVR2_I2C_PEND_CLIENT) {
			/* One or more client handlers are asking for an
			   update.  Run through the list of known clients
			   and update each one. */
			pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_CLIENT");
			hdw->i2c_pend_types &= ~PVR2_I2C_PEND_CLIENT;
			list_for_each_safe(item,nc,&hdw->i2c_clients) {
				cp = list_entry(item,struct pvr2_i2c_client,
						list);
				if (!cp->handler) continue;
				if (!cp->handler->func_table->update) continue;
				pvr2_trace(PVR2_TRACE_I2C_CORE,
					   "i2c: cp=%p update",cp);
				mutex_unlock(&hdw->i2c_list_lock);
				cp->handler->func_table->update(
					cp->handler->func_data);
				mutex_lock(&hdw->i2c_list_lock);
				/* If client's update function set some
				   additional pending bits, account for that
				   here. */
				if (cp->pend_mask & ~hdw->i2c_pend_mask) {
					hdw->i2c_pend_mask |= cp->pend_mask;
					hdw->i2c_pend_types |=
						PVR2_I2C_PEND_REFRESH;
				}
			}
		}
		if (hdw->i2c_pend_types & PVR2_I2C_PEND_REFRESH) {
			const struct pvr2_i2c_op *opf;
			unsigned long pm;
			/* Some actual updates are pending.  Walk through
			   each update type and perform it. */
			pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: PEND_REFRESH"
				   " (0x%lx)",hdw->i2c_pend_mask);
			hdw->i2c_pend_types &= ~PVR2_I2C_PEND_REFRESH;
			pm = hdw->i2c_pend_mask;
			hdw->i2c_pend_mask = 0;
			for (idx = 0, msk = 1; pm; idx++, msk <<= 1) {
				if (!(pm & msk)) continue;
				pm &= ~msk;
				list_for_each(item,&hdw->i2c_clients) {
					cp = list_entry(item,
							struct pvr2_i2c_client,
							list);
					if (cp->pend_mask & msk) {
						cp->pend_mask &= ~msk;
						cp->recv_enable = !0;
					} else {
						cp->recv_enable = 0;
					}
				}
				opf = pvr2_i2c_get_op(idx);
				if (!opf) continue;
				mutex_unlock(&hdw->i2c_list_lock);
				opf->update(hdw);
				mutex_lock(&hdw->i2c_list_lock);
			}
		}
		pvr2_trace(PVR2_TRACE_I2C_CORE,"i2c: core_sync END");
	} while (0); mutex_unlock(&hdw->i2c_list_lock);
}

int pvr2_i2c_core_check_stale(struct pvr2_hdw *hdw)
{
	unsigned long msk,sm,pm;
	unsigned int idx;
	const struct pvr2_i2c_op *opf;
	struct list_head *item;
	struct pvr2_i2c_client *cp;
	unsigned int pt = 0;

	pvr2_trace(PVR2_TRACE_I2C_CORE,"pvr2_i2c_core_check_stale BEGIN");

	pm = hdw->i2c_active_mask;
	sm = 0;
	for (idx = 0, msk = 1; pm; idx++, msk <<= 1) {
		if (!(msk & pm)) continue;
		pm &= ~msk;
		opf = pvr2_i2c_get_op(idx);
		if (!opf) continue;
		if (opf->check(hdw)) {
			sm |= msk;
		}
	}
	if (sm) pt |= PVR2_I2C_PEND_STALE;

	list_for_each(item,&hdw->i2c_clients) {
		cp = list_entry(item,struct pvr2_i2c_client,list);
		if (!handler_check(cp)) continue;
		pt |= PVR2_I2C_PEND_CLIENT;
	}

	if (pt) {
		mutex_lock(&hdw->i2c_list_lock); do {
			hdw->i2c_pend_types |= pt;
			hdw->i2c_stale_mask |= sm;
			hdw->i2c_pend_mask |= hdw->i2c_stale_mask;
		} while (0); mutex_unlock(&hdw->i2c_list_lock);
	}

	pvr2_trace(PVR2_TRACE_I2C_CORE,
		   "i2c: types=0x%x stale=0x%lx pend=0x%lx",
		   hdw->i2c_pend_types,
		   hdw->i2c_stale_mask,
		   hdw->i2c_pend_mask);
	pvr2_trace(PVR2_TRACE_I2C_CORE,"pvr2_i2c_core_check_stale END");

	return (hdw->i2c_pend_types & PVR2_I2C_PEND_ALL) != 0;
}

unsigned int pvr2_i2c_client_describe(struct pvr2_i2c_client *cp,
				      unsigned int detail,
				      char *buf,unsigned int maxlen)
{
	unsigned int ccnt,bcnt;
	int spcfl = 0;
	const struct pvr2_i2c_op *opf;

	ccnt = 0;
	if (detail & PVR2_I2C_DETAIL_DEBUG) {
		bcnt = scnprintf(buf,maxlen,
				 "ctxt=%p ctl_mask=0x%lx",
				 cp,cp->ctl_mask);
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		spcfl = !0;
	}
	bcnt = scnprintf(buf,maxlen,
			 "%s%s @ 0x%x",
			 (spcfl ? " " : ""),
			 cp->client->name,
			 cp->client->addr);
	ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
	if ((detail & PVR2_I2C_DETAIL_HANDLER) &&
	    cp->handler && cp->handler->func_table->describe) {
		bcnt = scnprintf(buf,maxlen," (");
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		bcnt = cp->handler->func_table->describe(
			cp->handler->func_data,buf,maxlen);
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		bcnt = scnprintf(buf,maxlen,")");
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
	}
	if ((detail & PVR2_I2C_DETAIL_CTLMASK) && cp->ctl_mask) {
		unsigned int idx;
		unsigned long msk,sm;
		int spcfl;
		bcnt = scnprintf(buf,maxlen," [");
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		sm = 0;
		spcfl = 0;
		for (idx = 0, msk = 1; msk; idx++, msk <<= 1) {
			if (!(cp->ctl_mask & msk)) continue;
			opf = pvr2_i2c_get_op(idx);
			if (opf) {
				bcnt = scnprintf(buf,maxlen,"%s%s",
						 spcfl ? " " : "",
						 opf->name);
				ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
				spcfl = !0;
			} else {
				sm |= msk;
			}
		}
		if (sm) {
			bcnt = scnprintf(buf,maxlen,"%s%lx",
					 idx != 0 ? " " : "",sm);
			ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		}
		bcnt = scnprintf(buf,maxlen,"]");
		ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
	}
	return ccnt;
}

unsigned int pvr2_i2c_report(struct pvr2_hdw *hdw,
			     char *buf,unsigned int maxlen)
{
	unsigned int ccnt,bcnt;
	struct list_head *item;
	struct pvr2_i2c_client *cp;
	ccnt = 0;
	mutex_lock(&hdw->i2c_list_lock); do {
		list_for_each(item,&hdw->i2c_clients) {
			cp = list_entry(item,struct pvr2_i2c_client,list);
			bcnt = pvr2_i2c_client_describe(
				cp,
				(PVR2_I2C_DETAIL_HANDLER|
				 PVR2_I2C_DETAIL_CTLMASK),
				buf,maxlen);
			ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
			bcnt = scnprintf(buf,maxlen,"\n");
			ccnt += bcnt; buf += bcnt; maxlen -= bcnt;
		}
	} while (0); mutex_unlock(&hdw->i2c_list_lock);
	return ccnt;
}

static int pvr2_i2c_attach_inform(struct i2c_client *client)
{
	struct pvr2_hdw *hdw = (struct pvr2_hdw *)(client->adapter->algo_data);
	struct pvr2_i2c_client *cp;
	int fl = !(hdw->i2c_pend_types & PVR2_I2C_PEND_ALL);
	cp = kmalloc(sizeof(*cp),GFP_KERNEL);
	trace_i2c("i2c_attach [client=%s @ 0x%x ctxt=%p]",
		  client->name,
		  client->addr,cp);
	if (!cp) return -ENOMEM;
	memset(cp,0,sizeof(*cp));
	INIT_LIST_HEAD(&cp->list);
	cp->client = client;
	mutex_lock(&hdw->i2c_list_lock); do {
		list_add_tail(&cp->list,&hdw->i2c_clients);
		hdw->i2c_pend_types |= PVR2_I2C_PEND_DETECT;
	} while (0); mutex_unlock(&hdw->i2c_list_lock);
	if (fl) pvr2_hdw_poll_trigger_unlocked(hdw);
	return 0;
}

static int pvr2_i2c_detach_inform(struct i2c_client *client)
{
	struct pvr2_hdw *hdw = (struct pvr2_hdw *)(client->adapter->algo_data);
	struct pvr2_i2c_client *cp;
	struct list_head *item,*nc;
	unsigned long amask = 0;
	int foundfl = 0;
	mutex_lock(&hdw->i2c_list_lock); do {
		list_for_each_safe(item,nc,&hdw->i2c_clients) {
			cp = list_entry(item,struct pvr2_i2c_client,list);
			if (cp->client == client) {
				trace_i2c("pvr2_i2c_detach"
					  " [client=%s @ 0x%x ctxt=%p]",
					  client->name,
					  client->addr,cp);
				if (cp->handler &&
				    cp->handler->func_table->detach) {
					cp->handler->func_table->detach(
						cp->handler->func_data);
				}
				list_del(&cp->list);
				kfree(cp);
				foundfl = !0;
				continue;
			}
			amask |= cp->ctl_mask;
		}
		hdw->i2c_active_mask = amask;
	} while (0); mutex_unlock(&hdw->i2c_list_lock);
	if (!foundfl) {
		trace_i2c("pvr2_i2c_detach [client=%s @ 0x%x ctxt=<unknown>]",
			  client->name,
			  client->addr);
	}
	return 0;
}

static struct i2c_algorithm pvr2_i2c_algo_template = {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
	.id            = I2C_HW_B_BT848,
#endif
	.master_xfer   = pvr2_i2c_xfer,
	.algo_control  = pvr2_i2c_control,
	.functionality = pvr2_i2c_functionality,
};

static struct i2c_adapter pvr2_i2c_adap_template = {
	.owner         = THIS_MODULE,
	.class	   = I2C_CLASS_TV_ANALOG,
	.id            = I2C_HW_B_BT848,
	.client_register = pvr2_i2c_attach_inform,
	.client_unregister = pvr2_i2c_detach_inform,
};

static void do_i2c_scan(struct pvr2_hdw *hdw)
{
	struct i2c_msg msg[1];
	int i,rc;
	msg[0].addr = 0;
	msg[0].flags = I2C_M_RD;
	msg[0].len = 0;
	msg[0].buf = 0;
	printk("%s: i2c scan beginning\n",hdw->name);
	for (i = 0; i < 128; i++) {
		msg[0].addr = i;
		rc = i2c_transfer(&hdw->i2c_adap,msg,
				  sizeof(msg)/sizeof(msg[0]));
		if (rc != 1) continue;
		printk("%s: i2c scan: found device @ 0x%x\n",hdw->name,i);
	}
	printk("%s: i2c scan done.\n",hdw->name);
}

void pvr2_i2c_core_init(struct pvr2_hdw *hdw)
{
	memcpy(&hdw->i2c_adap,&pvr2_i2c_adap_template,sizeof(hdw->i2c_adap));
	memcpy(&hdw->i2c_algo,&pvr2_i2c_algo_template,sizeof(hdw->i2c_algo));
	strlcpy(hdw->i2c_adap.name,hdw->name,sizeof(hdw->i2c_adap.name));
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
	strlcpy(hdw->i2c_algo.name,hdw->name,sizeof(hdw->i2c_algo.name));
#endif
	hdw->i2c_adap.algo = &hdw->i2c_algo;
	hdw->i2c_adap.algo_data = hdw;
	hdw->i2c_pend_mask = 0;
	hdw->i2c_stale_mask = 0;
	hdw->i2c_active_mask = 0;
	INIT_LIST_HEAD(&hdw->i2c_clients);
	mutex_init(&hdw->i2c_list_lock);
	hdw->i2c_linked = !0;
	i2c_add_adapter(&hdw->i2c_adap);
	if (i2c_scan) do_i2c_scan(hdw);
}

void pvr2_i2c_core_done(struct pvr2_hdw *hdw)
{
	if (hdw->i2c_linked) {
		i2c_del_adapter(&hdw->i2c_adap);
		hdw->i2c_linked = 0;
	}
}

/*
  Stuff for Emacs to see, in order to encourage consistent editing style:
  *** Local Variables: ***
  *** mode: c ***
  *** fill-column: 75 ***
  *** tab-width: 8 ***
  *** c-basic-offset: 8 ***
  *** End: ***
  */