drivers/macintosh/smu.c

1081 	struct smu_private *pp;
1084 	pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
1085 	if (!pp)
1087 	spin_lock_init(&pp->lock);
1088 	pp->mode = smu_file_commands;
1089 	init_waitqueue_head(&pp->wait);
1093 	list_add(&pp->list, &smu_clist);
1095 	file->private_data = pp;
1104 	struct smu_private *pp = misc;
1106 	wake_up_all(&pp->wait);
1113 	struct smu_private *pp = file->private_data;
1118 	if (pp->busy)
1123 		pp->mode = smu_file_events;
1135 	else if (pp->mode != smu_file_commands)
1140 	spin_lock_irqsave(&pp->lock, flags);
1141 	if (pp->busy) {
1142 		spin_unlock_irqrestore(&pp->lock, flags);
1145 	pp->busy = 1;
1146 	pp->cmd.status = 1;
1147 	spin_unlock_irqrestore(&pp->lock, flags);
1149 	if (copy_from_user(pp->buffer, buf + sizeof(hdr), hdr.data_len)) {
1150 		pp->busy = 0;
1154 	pp->cmd.cmd = hdr.cmd;
1155 	pp->cmd.data_len = hdr.data_len;
1156 	pp->cmd.reply_len = SMU_MAX_DATA;
1157 	pp->cmd.data_buf = pp->buffer;
1158 	pp->cmd.reply_buf = pp->buffer;
1159 	pp->cmd.done = smu_user_cmd_done;
1160 	pp->cmd.misc = pp;
1161 	rc = smu_queue_cmd(&pp->cmd);
1168 static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
1176 	if (!pp->busy)
1180 	spin_lock_irqsave(&pp->lock, flags);
1181 	if (pp->cmd.status == 1) {
1183 			spin_unlock_irqrestore(&pp->lock, flags);
1186 		add_wait_queue(&pp->wait, &wait);
1190 			if (pp->cmd.status != 1)
1195 			spin_unlock_irqrestore(&pp->lock, flags);
1197 			spin_lock_irqsave(&pp->lock, flags);
1200 		remove_wait_queue(&pp->wait, &wait);
1202 	spin_unlock_irqrestore(&pp->lock, flags);
1205 	if (pp->cmd.status != 0)
1206 		pp->cmd.reply_len = 0;
1207 	size = sizeof(hdr) + pp->cmd.reply_len;
1211 	hdr.status = pp->cmd.status;
1212 	hdr.reply_len = pp->cmd.reply_len;
1216 	if (size && copy_to_user(buf + sizeof(hdr), pp->buffer, size))
1218 	pp->busy = 0;
1224 static ssize_t smu_read_events(struct file *file, struct smu_private *pp,
1236 	struct smu_private *pp = file->private_data;
1238 	if (pp->mode == smu_file_commands)
1239 		return smu_read_command(file, pp, buf, count);
1240 	if (pp->mode == smu_file_events)
1241 		return smu_read_events(file, pp, buf, count);
1248 	struct smu_private *pp = file->private_data;
1252 	if (!pp)
1255 	if (pp->mode == smu_file_commands) {
1256 		poll_wait(file, &pp->wait, wait);
1258 		spin_lock_irqsave(&pp->lock, flags);
1259 		if (pp->busy && pp->cmd.status != 1)
1261 		spin_unlock_irqrestore(&pp->lock, flags);
1263 	if (pp->mode == smu_file_events) {
1271 	struct smu_private *pp = file->private_data;
1275 	if (!pp)
1281 	spin_lock_irqsave(&pp->lock, flags);
1282 	pp->mode = smu_file_closing;
1283 	busy = pp->busy;
1286 	if (busy && pp->cmd.status == 1) {
1289 		add_wait_queue(&pp->wait, &wait);
1292 			if (pp->cmd.status != 1)
1294 			spin_unlock_irqrestore(&pp->lock, flags);
1296 			spin_lock_irqsave(&pp->lock, flags);
1299 		remove_wait_queue(&pp->wait, &wait);
1301 	spin_unlock_irqrestore(&pp->lock, flags);
1304 	list_del(&pp->list);
1306 	kfree(pp);